f'r. he New 1941 Super Skyrider Model V SX-28 delivers precision performance! 15 tubes. 2 stages ~re-selection. Calibrated bandspread inertia controlled. Micrometer scale tuning inertia controlled. Tone and AC on-off. Beat frequency oscillator. AF gain. RF gain. Crystal phasing. Adjustable noise limiter. Send-receive switch. AVC-BFO switch. Bass boost switch. Phono jack. 80/ '40/20/10 meter amateur bands calibrated. Wide angle "S" meter. Band pass audio fil ter. Improved signal to image and noise ratio. Push-pull high fidelity audio output. 6 step wide range variable selectivity. Im proved headphone output. Super Skyrider, Model SX-28 with crystal and tubes,$179.50.
Adjust phasing Retune ltecelver to :'~~~:~ ir:t~ ;11r eontrolca.refully sharp position iden• until this weak• :~:. ·:~-:."8'~n ~r:rJ!t tit_r the weaker am er amplitude i• pitch control until phtude -Tune If•• reduced to a you get not• most c~iver to the weaker. minimum. pleasing to copy.
1 'fhe Sky Champion represents one of the best values ever offered in the communications field-has all the essential controls for good amateur reception. 9 tubes, 4 bands, tunes from 545 kc. to 44 me. Band one 545 kc. to 1720 kc. Band two 1760 me. to 5.2 me. Band three 5.3 me. to 15.6 me. Band four 15.3 me. to 44 me. Automatic noise limiter. AVC switch. Standby switch. Inertia handspread tun ing. Separate electrical bandspread. Beat frequency oscillator. Battery-Vibrapack, DC operation sockef. Cabinet dimensions 18½" long, 8½" high, 9%" deep. The Sky Champion (Model S-20R) $5,.t.50.
Tube line-up, 6SK7 RF amplifier,, 6K8 first detector-mixer H.F. Os scillator, 6SK7 first IF amplifier, 6SK7 second IF amplifier, 6SQ7 second detector, AVC first stage of audio, 6F6G second audio output stage, 6H6 automatic noise limiter, 6JSGT beat frequency oscillator, 80 rectifier. OCTOBER 1941 VOLUME XXV devoted entirely to NUMBER 10 D!ii
STAFF'* AMATEUR RADIO Bditori CLA.RX C . .RODIMON, WlSZ Manag,'ng Editor GEORGE (}RAMMERt- wl'DF Technical Editor DONALD H. Mix. w.!Ts BYRON GOODMAN, WIJPE A,,iatant Technical Editor• CONTENTS EDWARD P. TILTON, WlHDQ Editorials 7 Contributing Ed1'/or, [1.JI.F. Midwest Division Convention 8 V;:RNON CHAMBERS, w!JEQ New England Division Convention . . 8 Technical Information Seri/ice Around the World with the Yankee. Oakes A. Spalding, WlFTR 9 An 80-Watt AH-Hand Transmitter or Exciter · Jurns J. LAMB, WlAL B,rTon Goodman, Wl.TPE 15 _Re,earch Engineer, ,LFl,.ll.L. For the Junior Constructor A Lecher Wire System for U.II.F. Measurement 18 .. Adt•ertislng What the League ls Doing . . 20 l<'. CHEYNEY BEPl'KLFll.', wlos The Decade Calibrator. . . R. B. .Te.D're0y, fl"BGDC 23 Advertfainq M anaqer An Inexpensive Automatic Line-Voltage Regulator S. Gordon Taylor, W2.TCR 26 Cir','ulation New Acting Chief Signal Officer . 29 D,w:m II. JfouoPITON U.S. A. Calling ...... 30 CtrC-Ulation; Matla(lei In QST 25 Years Ago this Month 31 WWV Schedules . 31 RALPH T. BEAUDI1'., WlB.A.W YLRL, QRV! . . Anita Bien, IFBTA Y 32 ,isst. Cireulati'on .M a.naaer In the Services ...... 38 Navy Day Receiving Competition ...... 40 Predictions of Useful Distances for Amateur Radio Communica- * tion ...... 41 OFFICES Get Your Code Proficiency Award ...... 42 :-18 La Salle Road The Secrets of Good Sending. Part II E. L. Battey, IVJ UE ,i3 West Hartford, Connecticut ARRL Battery-Powered Equipment Test Subscription rate In United States and Possessions, ~.50 per yesr, post- F. E. Handy, WlBDI 4,6 1>aid; all other countries, $3.0\l per Oklahoma State Convention ..... 47 .Ye/11'. post.paid. S'lngJeeoples, :Z5cent.,. Foreign remittances ahou! • Officials appointed to al."t until the membership of the Section choose permanent S.C.M.11 by nomination and election. 4 Old Man Centralab is not as old as his name would imply . . . he has a modern mind. And, as new circuits come out of the laboratories, he is right there . . . abreast of the times with controls that say "uncle", and that fit into the tiniest places. So when you run across a new job that needs a replacement control. you may be certain Old Man Centralab can fill the bill . , . and if it's an old \ "blooper" ... there are any number of controls available that will make it "work like new". Old or new . . . there is invariably a CENTRALAB RADIOHM replacement that will do as well, or Centralab\\1 better than the original. "ALWAYS SPECIFY RADIOHMS / CENTRALAB". .______T / I CENTRALAB: Division of Globe-Union Inc. MILWAUKEE v' WISCONSIN STANDA::?t": Wall type rc11;i~to; hi1q~ inner circumte,en..:e i:,1 b!~.:.J, mouldl.'d b<'kelite ELF: Small, but also feat•n:es the long, case. Exclusive non-rubbing contact bAI1d for MIDGET: Companion to ":::'t:mclard" , .. straight resistor strip. Available plain or quiet, smooth rotat1on and long life. P;:11:" '!Jmall size but large control eftic1ency. Avail tapped with S.P.S,T. S•.vitch •.• with or diameter x 9/16" deep. Available -single, able single. dual or triple . . plain or without dummy lug. Switch rated 2 Amps. twin, or triple, plain or taped with one or vne, two or three taps . ~ ~.with S.P.S.'r., 125 V. Underwriter's approved. Bakelite two taps ... with S.P.S.T .. D.P.S.T., or S.P.D.T., or D.P.S.T. Moulded bakelite ccuie. ,:;ase 57,64" diameter, 11/32 deep (less S.P.D.T. Metal shaft extends 3~1R" from case ll/~" diameter, t.r4" metal shaft 33,S"' long. switch) 25132" deep with switch.. 5 HE AMERICAN RADIO RELAY LEAGUE, INC., Tis a non-commercial issociation of radio amateurs, bonded for the promotion of interest in amateur radio communication and experimenta tion, for the relaying of messages by radio, for AMERICAN the advancement of the radio art and of tht> public welfare, for the representation of the radio amateur in legislative matters, and for the main tenance of fraternalism and a high standard of RADIO conduct. ft is an incorporated association without capi tal stock, chartered under the laws of Connecti cut. Its affairs are governed by a Board of RELAY Directors, elected every two years by the general membership. The officers are elected or ap pointed by the Directors. The League is non commercial and no one commercially engaged in LEAGUE the manufacture, sale or rental of radio apparatus is eligible lo membership on its board. "Of, by and for the amateur," it numbers within its ranks practically every worth-while llireetors amateur in the nation and has a history of glori P;,1:dll~nt GEORGE W, BAILEY ...... , ous achievement as the standard-bearer in 74 \Vetister H.vR..rt~ '\\ri!Ston, Mass. amateur affairs. 'V:t,;.~... Pri-,.,9.ident CHARLF:8 E. lH,A r.,;,c!\'. ••••• , . , , .. Inquiries regarding membership are solicited. 8,c,x 551 Ymna~ Artz. Can-arltan GJ;ru:rrtl j_\fanager A bona fide interest in amateur radio is the only Al,EX REID •.... ., ..•. ,, .. ,,.,.,.,. VE2BE 240 Logan Ave., St. J.,aml.,ert, P. ,;. essential qualification; ownership of a transmit Atlanllc Dtofatan ting station and knowledge of the code are not WALTlm B.RAHLEY M.ART!N. ', ... '. w:tQV Hor'61Z, ftoolyn, Pa. prerequisite. Correspondence should be addressed Ce.ntral, 1J1trts1-0n to the Secretary. O(JO!JWIN l,. l.l()SLAND ...•.... , . 10 No. Clark St .. Chlca1co f)qketa I>fmtan (A ding) AD(1LPHUS A. F.:MEH:' G,m,,ral Counsel ...... PAUL M. SEGAL 1026 Woodward Building, Washington, D. C. Address all general correspondence to the administrative headquarters at West Hartford, Connecticut. "IT SEEMS TO US-" SHORTAGE OF MATERIALS of expression, and perhaps we ;;hall be much THERE seems no question that we the richer for a partial return to this much of shall shortly be in for a period of difficulty in the "good old daze." obtaining some of the gear, components and (}ST has a goodly supply of standard parts raw materials to which we are accustomed. and, by using them over and over, expects to Some materials already are unobtainable, continue its construction models as'in the past. dealers' stocks of many parts are dwindling As time wears on, the individual amateur mav and many manufacturers report grave diffi find it impossible to get theioe parts or accep~ culty in securing the supplies from which they :;ble substitutes. Then we'll see the burgeoning make apparatus for civilian use. forth of barn-door condensers and similar Without doubt this situation will be felt in contraptions made of pie pans, rolling pins, amateur design and construction. For many baking-powder cans, hairpins and old bicycle years we have enjoyed the availability of a pumps. Before that day is reached there is one marvelous variety of components. It has been large treasure-house to he explored, worthless so good that we have practically stopped to the commercial world but precious to us: making our own parts. We buy them and as the pile of junked broadcast receivers which semble them into rigs. One amateur's trans ,wery radio dealer has taken in trade and piled mitter differs from another's not so much in in his cellar. Here is a potential source of a lot the components as in their physical layout of good equipment in the way of power sup and circuit arrangement. For a long while plies, variable and fixed condensers, etc., prob back, Q8T'.~ apparatus designs (putting the ably good for transmitters up to a couple emphasis on use and performance) have de hundred watts with proper handling. ]n the liberately employed only the "standard" parts past they haven't been worth a dime a dozen that are widely distributed, with a minimum and prol>ably never will be worth anything of special gadgets that require home crafts c• xcept to the amateur on the prowl with that manship. certain glint in his eye. Remember that source It was not always so. Before the amateur when parts get tough. market blossomed out with its beautiful pro One thing most of us can't make is tubes. fusion of parts, the experimenter perforce Many varieties are gradually disappearing. made most of his own. We may be in for a While we don't want to Le like the women temporary return to this mode of life. Despite rushing the silk-storJcings counter, it might the annoyance, it will be an interesting and not be a bad idea to be a wee bit f orehandcd probably a profitable experience. American and lay by a couple of the indispensable bot native ingenuity again will be at a premium tles that keep the rig on the air. The expecta and will be vastly stimulated. Refreshing new tion is that there are tasks ahead that only designs are certain to result, many of them our stations can do. worthy of quantity production when condi tions return to normal. The five-and-ten will HUl\l SUPERHETS again be haunted by roving-eyed amateurs, EVERY so often we have sounded off in looking for something that will give them an these pages about the appalling decline in the idea. Ingenious mountings of wood - not quality of American broadcast receivers, par necessarily the old breadboards - are likely ticularly as concerns their lack of protection to come. It has been many years since we have against interference from other services. To seen a completely home-made t,ransformer or show that we are not, alone in this feeling, and a variable condenser fashioned out of tomato that we're not tilting at mere windmills, we cans but if this situation gues from bad to quote, with permissio-n, an editorial appearing worse we expect to see them ·again. There used under the tJtle "Recipe for a Black Eye" in to be a priceless ingenuity ahout the average a recent number of McGraw-Hill's preeminent amateur's station, each one an individual piece trade publication, Radio Midwest Division Convention New England Division Convention Kansas Citu, ~lo.~ October I.I.th-I.2th Boston,, 1llass.,, October I.Btli THE 1941 Midwest Division Convention THE New England Division Convention, will be held in Kansas City, Mo., October 11th and 8th annual Boston hamfest, sponsored by the and 12th, at the Hotel Muehlebach under the Eastern Massachusetts Amateur Radio Associa auspices of the Heart of America Radio Club. tion and the South Shore Amateur Radio Club, General Chairman Heyde, W9SSG, promises a bang-up convention. A program of interesting will be held at, the Hotel Bradford, Boston, on ,;peakers and demonstrations is being arranged. October 18th. An exhibit of emergency equip There also will be round tables for A..I\RS, NCR, ment will be held and all amateurs are invited to YLRL, u.h.f., etc., with a Wouff-Hong initiation submit entrieit; prizes will be awarded. Meetings Saturday midnight. An excellent hanquet has for. ORS, OPS, A.AB.9, AEC, u.h.f., and other been arranged for Sunday afternoon at which groups will be held and several technical talks Tom C~llins, newspaperman and famous after will be given. There will be a 2t:'i-meter hidden dinner speaker, will bowl you over with laughter. transmitter hunt in the morning. Come and hear Tom - you'll like him. And Registration fee will be $1.00 and the banquet bring the ladies for :1n interesting program being arranged for them. $2.00, or a combined ticket for $2.50; the banquet All this for only $2.50! Make registrations and will be limited to 400, so get your reservations in reservations earlv. For further information com early. WritA to Convention Chairman H. A. municate with the Heart of America Radio Club, Gardner, WlEHT, 25 Hillside Ave., Stoneham, Box 7092, Kansas City, Mo. Mass. 8 QST fot· Photos e,nurtesv Raymond DUZon Now t,hat I look back on that eventful t,his the Yankee was ideally suited, being heavily cruise aboard the schooner Y ankec I don't know enm,tructed and a remarkably good sea boat. She which gives me the biggest thrill - the foet that is 92 feet long over all and 76 feet on the waterline, I visited in person all those romantic spots you and carries in addition to her regular schooner read about in the travel books, or that I was rig an 82-hp. diesel engine which furnishes power probably the only ham in the world making for getting into port and for charging the storage DX QSOs with \Vs for nine long months or batteries. No radio transmitter was carried on the more. first cruise made by Captain .Johnson, but on the Not that it was planned that way, of course. second trip a small transmitter was built and The European situation looked pretty bad, it is installed by Alan Eurich, W7HFZ, who went true, when we left the dock at Gloucester in the along as operator. fall of '39 for an eighteen-month cruise around When the opportunity to go on the third cruise the world, but American hams were still free to presented itself I took advantage of it, and on work any other country as long as strict neu October 27, 1939, we set sail from Gloucester. trality was observed. It wasn't until the following The party consisted of Captain Johnson, his .June that U.S. stations were forbidden to make wife, his two small sons, Miss Nora Bailey foreign contacts. of Toronto, Dr. Raymond Dillon of Boston That was when the FC0 issued Order No. 72. (W3DWJ/1) who was the medical officer as well You may remember it. I do, for in banning con a~ photographer, myself as radio operator, Fritz, tacts with foreign amateur stations it also out the paid cook, and a group of young men of lawed contacts with ships at sea. around college age who were taking the trip to Since we depended to a great extent on our see the world. amateur schedules. this was a serious blow. The route we followed went about as follows: "Fortunately, the ARRL was able to get the FCC From Gloucester we sailed down through the to adopt an amendment to the order designating Panama Canal, and then across the South Pa certain stations which could continue to work us. cific, visiting as many islands as possible. We Probably every amateur has a general idea of visited the Solomon Islands and New Guinea and the- nature of the cruise aboard the Yankee, the Dutch East lndies and Singapore. From either from hearing contacts over the air or Singapore we cruiied around the north end of through reading Alan Eurich's accounts of the Sumatra, across the Indian Ocean to Zanzibar, previous voyage in QST. and then south around the Cape of Good Hope The Yankee is an old Dutch pilot boat used in to Capetown. On the way home we crossed the t.he North Sea until about 1925, when she was South Atlantic to Brazil, and then sailed up the acquired by an Englishman for a yacht. Captain coast to New Guinea; through the West Indies Irving Johnson bought the boat in 1932 with the to Bermuda, and so home. idea of making trips around the world in it. For I'd like to tell you about some of the hams I * 307 Highland St., Milton, Mass. met and the experiences we encountered along October 1941 9 While in the Galapagos Islands we saw several commercial tuna fishermen from San Diego and spent an exciting morning on one of them, the Belle of Portugal. She was one of the larger fisher men and could carry 300 ton of tuna. Radio was used on the,;e boats to keep in touch with home and report the location of fish and bait. While at Panama, we had been asked to take nlong eight bags of mail and other ~upplies for Pitm1irn. Island. Jn the shipment was VR6A Y's transmitter, which had been sent for repair to Panama by Andrew 'foung. It was finally landed from the Y a-nkee after an exciting trip through the surf at Bounty Bay. Un.fortunately, by that time, all operation by British amateurs was prohibited, Andrew Youn/(, op.-rator at Pitcairn Island of the so many interesting DX contacts were missed. famous VR6A Y. When we arrived at Pitcairn we found that the New Zealand Government had sent over an that route. Suppose we sit down and look over amateur (Nelson Dyert, ZL2FR, who had mar that tattered WC.FT log .... ried a girl from Pitcairn) to e.st,ablish a govern After a stormy trip down the Atlantic -- in ment station. Conse_quently, although no amateur iti:;eJf quite an experience for a green crew - we work ~ould be done, VR6A Y was still on the air finally reached Panama. Although we could not working schedules with Wellington on government avoid a tropical hurricane t,hat seemed to be frequencies. ZL2FR had brought over his own ham aimed directly at us, we were able to prepare for rig and was running about 200 watts. Power was it and get on the favorable side of the storm obtained from a 1-kw. Kohler generator. center. On the way down, NAA's weather was The ocean was so dear at Pitcairn that we copied daily and its value to sailing ships was could see the anchor, 120 feet below. '\Ve could thoroughly appreciated. even see the remains of the Bounty------the imprint In Panama, Major R. D. Prescott of HPlA of the keel, and some of the timbers ----- in the fame --- hero of many a DX contest and the !:rystal depths. Radio conditions in the vicinity 0 only licensed amateur in the Republic of Panama of Pitcairn were remarkable. From about 5 P.M. - was of great help. We found him to be ri, solid the broadcast stations from the U. 8. East Coast citizen of middle age, a resident of Panama most began roaring through and WEAF, WJZ, WOR, of his life and now t,he head of radio activity in WLW and the other higher-powered stations that country. On the trip down to Panama we had came in like locals. All other frequencies were trouble with the 'phone cords absorbing moisture, f'OJTespondingly good - a genuine paradise for a and it was necessary to bake them in the oven .DX hound. before going on the air. HPlA obtained a set of We stopped for a week at Pitcairn. I was the rubber-covered cords for us and cured the trouble guest of Andrew Young and hL'l family in their completely. comfortable wooden frame house. They could K5AA, K5AF and K5AG were visited, and not have been more cordial; I enjoyed my visit some of the preparations designed to make tremendously. An.drt!w has sent out over 4000 Panama invincible were seen, although at that time the defense program had not really started. Lt.-Comdr. Tucker of the naval communications unit came aboard for a visit and his suggestions aR to guarding against moisture (principally the burning uf a 10-watt bulb in t,he receiver at all times) were most valuable. From Panama we sailed for Ecuador, where the Yankee was left on the coast at Salinas while the erew went overland to Guayaquil. 'Phone men will associate HC2HP with that city, and a visit was made to the station. Un.fortunately, Dr. Parker, the owner, was away at the time, Lut his son, also an amateur, showed us the rig. The Galapagos Islands were the next port of call. Here on San Cristobal there is a government station, HCW, whose operator, several years ago, Radio station at Tarawa in the l;ilbert and !Wice gave American hams an Ecuadorian contact Islands. A single '45 was used for communication with while operating under the call HCAC in Quito. the other islands. 10 QST for QSL cards, perhaps half of which represented contacts. Honolulu was the next port, where there was amateur activity. Two davs before we reached Honolulu I had contacted ,John W. Hopkins, K6PLX, who notified the authorities of the time of our arrival and met us at thP. dock. He and ,I. F. Bingham, K6PKJ, had handled traffic to Schofield Barracks for us from one of the boys on the boat whose father was in the regular army, and also handled some of our messages to W lAW while we were in Honolulu. .Frank Bishop, K6PAS, very kindly arranged a 10-meter 'phone contact with WlAWand I was able to talk to my wife in Hartford. Visits were made to t.he Pan-American radio i,tations on the north side of t,he island and the Globe Wireless station, KHK. I found radio a vitally important factor in life in Hawaii. Due to the war and the great increase in air travel there is a great deal of activity in all branches of radio, and the newest and latest equipment could be seen everywhere. In fact, I saw some apparatus there more modern than anything I had ever seen in the States. On our way to American Samoa, we stopped off a couple of days at Canton Island. This is Native boys in the Solomon Islands. These boys the first stop of the Pan-Am Clippers on the run brought ont a highly inlaid canoe which was purchased to New Zealand. Regular flights were to be for the Mariners Museum at Newport News, Va. started in the near future, and there was much uctivity preparing for the service. In addition, way?" It, seemed his traffic for t,hc past day or so Canton Island has become an important outpost had consisted of nothing but messages from the for the defenses of Honolulu and several flights of Secretary of Htate, the Secretary of the Navy and Navy planes had visited the air base. Pan-Am other high official~ ordering the Governor to maintains a well-equipped radio station for the invite Mrs. Donovan to stay with him. use of the Clippers, as Canton Island is small and It turned out that none of this was a surprise to highly accurate direction-finding syste= must be the Governor. It seems he had an all-wave set and used. The U. -S. Department of Commerce main knew the code, and had picked up the original tains a weather reporting station there, as well. message! The operators of the U. S. weather station were We reached Samoa in April, 1940. During our active on the amateur bands under the call stay their Declaration of Dependence Day was .KF6JEG. Schedules were maintained with Henry celebrated. It was the 40th anniversary of U. S . Lee and ,Jim Stein for a time after the Yankee acquisition of the islands. A big celebration was left Canton. held, and native tribes came in from the Rurround One of the more dramatic episodes of the trip i.ng vilhges and pel'formed ceremonial dances in occurred while we were en route to Samoa. Mrs. competition for prizes. William J. Donovan (wife of Col. "Wild Bill" American Samoa is directly under Navy r.on Donovan, President Roosevfllt.'s special European t.rol and amateur radio has always been frowned emissary) had joined the party at Panama. One on bv the officials there. KH6SHS and KH6D ME night at sea I received a radiogram from her wer~, in_ the naval radio station, however, and husband via WlAW stating that her daughter hoped to be able to get on the air soon. ,Terry had been killed in an automobile accident. Im Petranek, KH6SHS, did manage to get on after mediately we began to check eastward sailings; we left nnd gave a few lucky U. S. hams a eontact the Mariposa was due to leave Samoa in 10 days. with Samoa. His station was located at Pago That meant a wait, so Mrs. Donovan filed a Pago, a beautiful landlocked harbor surrounded reply asking that arrangements be made for her with high hills which made it difficult to get a to stay at the Governor's mansion on the island. signal out. I passed the message on to K.F6JEG, who relayed Back in Honolulu we had been approached by to W2IXY. Confirmation eame hack the next the Amelia Earhart Foundation, who asked us night. When we reached Samoa I stopped by for t,o go through the Gilbert and Ellice [,;lands to see a ragchew with the operator. He asked, "Just if there WP.re 11,ny traces of her plane. Needless to· who have you got aboard that tub of yours, any- say we found no such traces, but the side trip October 1941 11 gave us an opportunity to see of signals from Japanese, some of the typical South Chinese and other govern Sea islands. A schedule with ment stations. These signals K6FVL was arranged before would wander up and down we leit Honolulu, and we the band. It is no wonder were able to report regularly that more 40-meter U. S. to the Foundation through ;signals are not reported him. These islands are off from the Far East. t,he beaten track and very At Tulagi, in the British few traders visit them now, Rolomon Islands, we met due to the lack of shipping Bruce Chapman, who with and the poor market for Dickes, VR4AD, has put the copra, their only commercial Hnlomon Islands on many a product. The British Govern llX ham's map. ment maintains radio com Port Moresby, the chief munication bet.ween the dif port of New Guinea, was a ferent islands, mostly with c•nmmunication center for small battery-operated port,.. the distrid,. There were radio able 'phone _transmitters. At direction finders there and one island, Vitupu, they equipment for the air-mail used a couple of '0lA's using ~ervice to the gold fields in a test-tube "B" hutterv the interior and to Atl',tralia. supply which had to b"e At the commercial station charged every day by a Rollinii along in the trade winds with the we found Warner, Searle, couple of native boys pedal squaresail. Hodges and 8everal other ling a bicycle generator. VK am[Lteurs. They enter When we arrived ri,t Ocean I.sland, the official t,ained us rovallv. Here, as in the South Seas, who cnme aboard to seal t,be transmitter was radio is of prime.. unportance. none other than A. B. Dickes, VR4AD, who had In all parts of the British Empire we found been shifted from Tulagi in the Solomon Islands. that the amateurs had formed the first line of I had worked him from my home station and we defense in communications. With the tremendous spent an evening talking over ham radio and old expansion neces8ary to maintain wartime com times. He was only waiting for the war to end so munication, the hams had cheerfully contributed that he could get back on the air again. VR4AD their 8ervices and equipment. lt was another felt very strongly about t,he war, for it had striking indication of t,he solidarity of the British thwarted him in fulfilling his life's ambition: to Empire. be the British Empire station to work the most When we reached Batavia in .Tava after a American hams dming a year. He had figured wonderful trip through the Dutch East Indies - nut an exacting timetable for accomplishing this including a stay at Bali which was even better feat- 6½ minutes per contact, so many con than we had expecl,ed! ---- we found that the tacts a day, etc. This program had been inter NIVIRA was still vP,ry active and that the rupted by the war, and he was anxious t,o get amateurs are highly regarded by the Dutch back at a key again. Government. Meetings were being held almost About this time we began to experience diffi every week. Listening posts had been established eulty in pulling signals through on 40 meters all around the coast of .Tava to warn in case of from t,he United States, not because the W invasion, and' the amateurs were being called stations were weak but be0a115e t.he band was full upon to take up this work. Amateurs were Tuna fishing on the commercial tuna fisherman Belle ef Portugal from San Diego. The Galapagos Islands are one of the best fishing grounds in the world. 12 QS T for important, too, in the communications depart ment of KNILM - the Dutch Airline Company. I had a very nice visit with Th. Leyzers, PKlCF, the president of the NMRA. Like practically all of the amateurs we met, he spoke excellent English, and he told me what the ama teurs were doing in the war. He felt, too, that amateur radio had demonstrated its usefulness and that they would be allowed to operate again after the war. The following morning I visited Mr. Van Swieten, PKIKE, the treasurer of the society. He gave me some idea of the difficulties in sending money out of the country due to exchange regula tions. At first they had been unable to purchase any American parts, but finally they persuaded the government that American parts and sets were necessary and the regulations were relax<'d. In Singapore I looked in vain for any of the old amateurs that had been licensed before the war. All were in either army or navy service and I could not get in touch with them. However, VS3AE, the son of the Sultan of Johore, paid a visit to the boat, flanked by camera and secretary. James Norman Hall, author of "Mutiny on the He is a genuine ham - has probably the world's Bounty" and Captain Johnson on ',the deck of the biggest QSL card. Later we saw his private zoo, Yankee at Tahiti. where he has a gorilla almost as large as Gar gantua and other animals. chances. Mr. Trinidade, VPlPZ, the only ama From Singapore we sailed around the north end teur on the island, is one of the officials in charge of Sumatra and down the west coast to Padang, of the radio station. The town of Zanzibar is which was our jumping-off port for the trip Arabic in character, and it was quite an adven across the Indian Ocean. There we met H. Decker, ture finding one's way around the narrow streets PK4DR, and E. M. Z. Steenbakker, PK4ES. during the blackout. Demonstrating the camaraderie that exists We put into Dar Es Salaam, Tanganyika, on among hams everywhere, they kindly donated a the mainland of South Africa, to have repairs neon bulb and a 42 tube. On the boat (as at made to our rudder, which had been damaged in home!) the mortality of neon bulbs was very a storm on the Indian Ocean. This is in the terri high. The trip across the Indian Ocean took tory acquired from Germany after the last war. thirty days, during which At the time theni was a time we had every kind of rest camp for the South weather from dead calm African Air Force just out around the Equator to a side of the town, and we met heavy following trade wind many of the officers and men. which pushed the Yankee They are a fine group of along to break her previous men and couldn't have been record for a day's run. It more hospitable. Here, also, was during this trip that I was a training camp for the heard AC4GP calling" CQ King's African Rifles, native QSL through AC4YN" sev troops officered by South eral times, and I have often Africans. Their discipline wondered if his signal was and morale was exceptional. heard in the U. S. He had a We found H. J. Powell, very good signal and should VQ3HJP, in charge of the have been heard in the U.S. radio service for the airlines When we reached Zanzi and the telegraph company. bar we found the city under Once again I was made quite a total blackout at night. homesick looking over the The Italian Somaliland bor hundreds of QSL cards from der was less than 300 miles the U.S. Turks Island in the Bahamas. Salt ob Powell showed me some away and, although there tained from evaporating sea water iu the had been no enemy activity, background. The authQr wasn't arrested for of the British Marconi equip the officials were taking no speeding. ment that was used at the October 1941 13 kee," and we were told to come on in and anchor. Later I was told by the port commander that they had a shell in the gun and the gunner was asking, "Shall I Jet him have it?" when we didn't heave to on the signal "K." You see, "K" in the flag code (ordinarily never used with blinker signals) means, "Heave to immediately!" Arriving back on American shores at George town, British Guiana, I looked up .J. LaMotte Kerr, VP3BG, whose amateur station has been turned into the official broadcasting station. The transmitter operates in the 48-meter band under the call of ZKY. VP3BG is also in charge of a network of 'phone stations located on the various plantations, giving complete coverage of the whole country. They turned to radio when the natives persisted in the embarrassing habit of chopping down telegraph lines as often as they were erected. Antigua in the Windward Islands was our next port of call. There I found that VP2AT's station had similarly been made the offical broadcasting station for the island. DeSilva is in the customs department and it was he who came aboard and sealed our equipment when we put into the harbor. Through the cooperation of the ARRL, daily A ,IOO-pound sea turtle caught in the Galapagos Islands. Turtle steak tastes like tbe best beef tenderloin. schedules had been arranged with WIAW. The We carried five of these large turtles alive on the fore outstanding signal of WIAWall around the world deck for a fresh meat supply. and the patience and operating ability of Hal Bubb and George Hart in copying our signal station. They go in for very massive construction through the heavy QRM on the 36-meter ship lvith a maximum of tubes, and are very partial to band enabled us to maintain these daily sched relays. Amateur design would accomplish the ules. Night after night WIAW copied our signal same or better results with half the tubes and through QRM that would have driven the aver space and with a corresponding decrease in t,he age operator crazy. On our end the problem was t1hance.s of failure in the component parts. relatively simple, as WlAW's signal was always Capetown certainly lived up to its reputation perfectly readable. Amateurs who think our for hospitality. Although it seemed that every bands are crowded with poor signals should try to amateur in South Africa was on active service copy through the signals found on 36 meters! with the forces, I did meet a few of them. Among When we reached the vicinity of the Solomon them was C. A. W. Rieder., ZSI T, who does much Islands, Carl Anderson, W6CDA, took up the of the radio servicing on ships that enter Cape burden of the schedules. W6FT's signal was be town. He had been doing a lot of listening on fre coming unreliable on the East Coast, although quencies around 30 Mc. and above, and said that WIAW was still pounding through. Carl's coop the Hignals from U. S. police transmitters were eration was greatly appreciated and he was al coming through consistently. Here also I met ways ready to keep schedules at the time most Warren Eckweiler, ex-W2CCZ, who entertained convenient for us. several of us one evening at his home. To facilitate traffic, Carl arranged a relay We were almost fired upon by the shore battery schedule with KAI.AK in Manila which carried due to a mix-up in blinker signals when we ar us half way across the Indian Ocean, when we rived at St. Helena early one morning during a began to pick up signals consistently from the heavy mist. We entp,red the harbor at dawn. East Coast again and schedules were resumed The skipper could see the harbor blinker batting direct with WIA W. away through the fog and called me up to see Two members of the crew were from Cincinnati, what was doing. The harbor station was sending and schedules had also been arranged with "K." If we had been receiving our entering in~ W8JRM. Although troubled by power leaks and 8tructions by radio this would have meant "come QRM, he was able to maintain very consistant ahead," of course, so l sent back "R" ::md we communication. A surprisingly good S7 signal sailed on in. They sent "K" again, and we re was received from him on 40 meters the day be peated the exchange a couple of time-a. Finally fore we arrived in Singapore. they asked what boat we were. l replied, "Yan- (Continued on page JOB) 14 OST Ior ".l'he 80-watt transmitter uses a string of 6AC5G'• to ,exttJ:e an HY30Z on any band. The coils shown are for 114-Mr~ operation with an 80-meter oscillator - the :28-M11 •.o An 80-Watt All-Band Transmitter or Exciter .,t Design for Convenient Band Changing UV BYRON GOODMAN.* WldPE FOR a nlll:!lber of yean a.n 6.Jwxeasing pro tube is an HY30Z, a tube that delivers from 45 to pur'timwf the amateurs have been u.sing variable 50 watts on all bands from 160 to 10 meters. frequeney crystals m: oscillators to move from Operating on the fundamental frequency of the under QRM or (bles.; their little hearts!) to set oscillator the HY30Z is driven directly, and an their frequency to thtllt ,of someone eL~e. This additional 6AC5G doubler tube is cut in auto practice has modified stati@ design to the extent matically as successively higher-frequency bands that the frequency-control dewice (crystal-switch are used. The 6AC5G i::! a modern version of the ,ing, e.c.o., etc.) is usually located right at the 46, and it is i:i,n excellent tube for use as a low ,operating position, whlle the transmitter proper power doubler. Because of its high µ, a i:;mall imay be across the room OIi' l,\l,.t least located where amount of cathode bias will keep the idling plate iit would be inconvenient to iID\l(O\lilllik't. ,tb_e frequency current to a low value without the need for ex mm1trol unit and still have itt :ali(\(\esE\iW.e without t,ernal bias. The HY80Z is aiBo a h'gh•µ tube, and lew-.ing the operating position_ . .Maail)Y ~.ercome 6 volts of dry-cell battel'y bias will limit the idling this d.i.fficulty by placing their traru;;ljJilji_td;ws ~ong current to l1bout 10 rnt1.. Oper11.t!ng the tl).bes in side ~ operating position, but j1,J.$1!; :.W AAt!J,!jl.j' this manner at less than cut-off bias tends to pr * Assistant Technical Editor, QST. October 1941 la grid of the HY30Z and automatically leaves the the final, but the excitation would be somewhat plate voltage off of the 6AC5G doublers. If 40- under the nominal value. meter operation .iH desired, the input coil is plugged in socket 83 and the 40-meter coil is Construction plugged in socket S4. The jumper in La puts The transmitter circuit lends itself readily to plate voltage on the 6AC5G and its grid and straightforward construction and a reasonable plate circuits are tuned to 80 and 40 meters by amount of symmetry in the layout. It is built on Ca and C4 respectively. The same principle ap a 3- by 7- by 17-inch metal chassis, as can be plies to operation on 20 and 10 meters - on 10 seen from the photographs. The small doubler meters the input coil is plugged in S1, the 40- tuning condensers are mounted under the chassis meter coil in S2, the 20-meter coil in Sa and the on the front. Single-hole mountings are used, and 10-meter coil in S4. Fairly uniform excitation is the condensers are insulated from the metal by applied to the HY30Z on all bands, although it fiber washers. The final tank condenser is mounted does drop off slightly on the higher frequencies. on small Isolantite stand-off insulators, since Another advantage of this syst'lm is that the grid the rotor has the full plate voltage on it. The lead to the HY30Z is short, not so in some switch HY30Z tube socket is sunk below the chassis to ing systems. The one drawback of the line-up is bring its plate closer to the stator connection on that there isn't enough drive on 28 Mc. to double the tank condenser. sucCP,Ssfully to 56 Mc. in the HY30Z. The final tank condenser was modified slightly One might wonder why beam-power tubes like by removing the aluminum cross piece that the 6V6 weren't used instead of the 6AC5G's. If mounts the rotor brush and substituting a strip they were, the switching problem would be com of bakelite. The final tank coil socket is mounted plicated because of the need for removing screen 011 the bakelite strip, and the rotor brush is as well as plate vpltage, the tubes would all be over fa~tened to the chassis under the condenser on a driven, and some fixed bias would be required. small Isolantite through bushing. This makes a It might also appear attractive to use a high couvenient lead from the rotor to the under side powered beam tube in the final, such as the 813 of the chassis and allows the plate by-pass con or HK257, but unfortunately it is impossible to denser, C1s, to be mounted underneath the get a good match from the plate of the 6AC5G to chassis. The neutralizing condenser, CN, is the grid of a final tube of this type without mounted above the chassis on the small insulators tapping down the 6AC5G plate on the coil This furnished with it, and the lead from it to the grid can be done in this circuit but the 6AC5G's are is run through a small insulating bushing. then overdriven, with consequent grid emission The filament transformers are mounted under and plate current drift. The transmitter was first the chassis at convenient points. A single 6-am designed along these lines but had to be modified pere transformer could be used instead of the two to the present line-up because of the objections that are shown - two are used in this rig because just mentioned. This works out to be a more transformers of different voltages were necessary practical set-up anyway, since the triode requires for some of the other tubes that were tried. If a no large bias supplies or heavy voltage dividers single transformer were used, one side of the as does the beam tube or pentode. The HY30Z 6AC5G heaters would not be grounded, of works in well because its high µ makes it require course. practically no fixed bias, and the output of a The power terminals are brought out at the rear 6AC5G doubler running with 300 volts on the of the chassis to a Millen 37015 terminal strip plate gives a nice margin over the rated drive on and a 37001 safety terminal. The excitation input all but the 28-Mc. band. Doubtless other and terminal is mounted on the side of the chassis and slightly higher-powered tubes could be used in is an Amphenol PClM unit. The small tuning condensers and the filament transformers can he seen in a view underneath the chassis. The HY30Z socket has been lowered by mounting it on long screws. The lead from the rotor of the final tank con d,mser ia brought down through an insulated hushing on which the rotor brush bas been mount• ed, and the grid lead from the neutralizing condenser is also brought through a hushing. The 6ACSG plate blocking conden• sers are hidden by the tuning condensers. 16 OST for key-up value of the 6AC5G plate current is less Tuning the Transmitter than 5 ma. Tuning will be greatly simplified if meters On 20 meters L2 is plugged in S2, the 40-meter can be left in the various circuits. A 0-150 or La is in Sa, the 20-meter La is in 84 and the 20- higher milliammeter should be used in the plate meter tank coil is in the HY30Z plate circuit. lead to the HY30Z, a 0-100 or higher milliam Tuning the circuits to resonance and loading the meter can be used in the 300-volt line to the final to 90 ma., the grid current should be above 6AC5G's, and a 0-50 or higher milliammeter 25 ma. and the 6AC5G currents will total about can be used in the HY30Z grid circuit from the 70ma. 6-volt bias battery to ground. The 28-Mc. final grid current should be over 20 For SO-meter operation, L2 is plugged in S4 and ma. with the HY30Z loaded to 90 ma., and the the 80-meter coil is plugged in the output tank total 6AC5G current will be about 90 ma. For circuit. The grid circuit is tuned and, if the this band, L2 is plugged in S1 and the 40-, 20- and frequency-control unit is delivering enough 10-meter La's go in S2, Sa and S4 respectively. power, from 25 to 50 ma. grid current to the The coils used in the final amplifier are being HY30Z should be obtained with no voltage on run considerably above rating and, for this rea the plate of the HY30Z. The neutralizing con son, some care should be exercised in using them. denser, CN, is then adjusted until there is no This means not operating the final unloaded for flicker in the grid current as C5 is tuned through any length of time or else the coils will lose their resonance. Plate voltage can now be applied to shape because of the heat softening the plastic the HY30Z and the stage loaded to 90 or 100 ma. that holds the turns. For c.w. work the eoils will The grid current will drop down to the normal work along merrily without any trouble, but for value of 20 to 30 ma. 'phone work it is advisable to go to a somewhat For 40-meter ope.ration, Li is plugged in Sa, larger coil, such as the B & W Type BL or the the 40-meter La is plugged in S4, and the 40-meter Millen 100-watt coils (44080, etc.). tank coil is plugged.in the HY30Z plate circuit. With 800 volts on the plate of the HY30Z, it Tuning Ca and 04 to resonance should give from will deliver about 50 watts on the bands men 25 to 30 ma. grid current with the HY30Z tioned. This is enough to satisfy the low-power loaded to 90 or 100 ma. plate current, and the man, or it is plenty to excite most 300- to .500-watt 6AC5G plate current will run around 40 ma. The amplifiers. ® +300 - -&V. +800 IISV.,A.C. INPUT COIL ALL OTHER COILS Fig. 1 - Wiring diagram of the 80-watt exciter unit. Ct, C2, Ca, C4 -100-µµfd. midget C6, C1, Cs, Cto, Cu, Cta, C14, Crn, R5 - 10,000 ohms, 1-watt. variable (CardwellZU-100- C11-0.005µfd. midget R1-3000 ohms, 10-watt. AS or Hammarlund HFA- mica. RFC - 2.5-mh. r.f. choke (Millen 100-A J. Cg, C12, C15 -100-µµfd. midget 34101 or National R-100). C.; -100 µµfd. per section dual mica. 81, 82, Sa, 84 - 5-prong sockets for (National TMK-100D). C1s - 0.001-µfd., 2500-volt mica. coils. CN - 18-µµfd. neutralizing coo- Rt, Ra - 20,000 ohms, I-watt. Tt, T2 - 6.3 volts, 3-ampere trans- denser (National STN). R2, R4, R& -500 ohms, I-watt. former (Thordarsoo Tl9F97). Lt - Output tank coil for proper frequency (National 14 Mc.: 9 turns No. 24 d.c.c., spaced to occupy ARI6-C). ½-inch winding length. L, - 3.5 Mc.: 36 turns No. 24 d.c.c., close-wound. Link 28 Mc.: 4 turns No. 18 enam., spaced to occupy is 7 turns No. 28 d.c.c., close-wound next to ½-inch winding length. ground end of L,. I,2 and all La are wound on 5-prong, I-inch diam. La - 7 Mc.:.. 16 turns No. 24 d.c.c., close-wound. form (Millen 45005). October 1941 17 • ]dL 1:JuL ~ e-- ALecher Wire System ior U.H. Frequency Measurement ONE of the well-known attractions of I~ngth is readily converted into frequency by a ultra-high frequency operation above 112 mega simple formula. And that is all the equipment and cycles is the relative simplicity of the apparatus calibration required. r,ommonly used. But there is always one pressing Two things are important in constructing the question when trying out a new receiver or put (ine: it should be at least a wavelength long, and ting a transmitter on the air: "How can I tell 1t should be entirely air-insulated except where whether I'm tuned in the band or not?" While the it is supported at the ends. The length is neces frequency-me:.umrement technique used on lower sary to make sme that two current loops will frequencies can be extended to the ultra-highs fall on the line, and the air insulation to avoid (one of the simpler pieces of equipment for low any "slovving-down" of the waves which might frequency mea:,;mements was described in this take place if insulating spacers or stand-offs were department last month 1) at 112 Mc. it becomes used_ The wires can be stretched tightly between pretty complicated, both in operation and the any two convenient supports, using a spacing of minimum equipment required. And there are an inch to an inch and a half. The positions of the plenty of chances for picking the wrong harmonic current loops are found by means of a "shorting somewhere along the way. bar," which is simply a metal strip which can be However, at 112 Mc. we can actually mea:,;ure slid along the line to vary its effective length. the length of the waves generated, which is Making Measurements getting right down to fundamentals. The meas urement is made by observing standing waves on Resonance indications can be obtained in sev Lecher wires, a set of Lecher wires being nothing eral different ways. Let us suppose the frequency more t,han a two-wire transmission line. Such a of a transmitter is to be measured. A conveniedt line shows very pronounced resonance effects and :1,nd fairly sensitive indicator can be made by it is possible to determine quite accurate!; the i;oldering the ends of a one-turn loop of wire ~f points of maxinmm cmrent (loops) along the line. about the same diameter as the transmitter tank The distance between two consecutive current coil to a flashlight bulb, then coupling the loop to loops is equal to a half wavelength, provided only the tank coil to give a moderately-bright glow. A that the line is completely air-insulated in the similar coupling loop should he connected to the intervening length. Once the distance between ends of the Lecher wires and brought near the two loops has been determined it can be measured tank coil Then the shorting bar should he slid with an ordinary ruler or yardstick, and the along the wires outward from the transmitter until the lamp gives a sharp dip in brightness. 1 "A /iO-, 100- and 1000-kc, Oscillator for Band-Edge This point should be marked (a piece of string Spotting," QST, September, l!J41. mn be tied on one of the wires) and the shorting . '.~,be Lec~er wire s:ystcm set up for frequency measurement, using a crystal~detector wavemeter as a resonance md1cator. ~ecause t~JS sys~cm makes possible very loose coupling to the oscillator, it will give more accurate readings than couphng the wires dtrectly to the transmitter tank. 18 OST for. A view of the other end of the wires, showing the turnbuckles for maintaining tension. The slider carries the shorting bar, maintaining it at a fiJCed angle with the wires. bar moved out until a second dip is obtained. Marking the second spot, the distance between the two points can be measured and will be equal In using the shorting bar, make sure that it is to half the wavelength. 1f the measurement is always at right angles to the two wires. A sharp made in inches, the frequency will be edge on Urn bt1,r iB desirable, since it, not only F 5906 helps make good contact hut also definitely · Mc. length (inches) locates the point of contact,. Ji the length is measured in meters, the formula Building a Lecher Wire System becomes The wires can be used more conveniently and F 150 with greater accuracy if they are mounted up in Mc. length (meters) fairly permanent, fashion and provided with a shorting bar maintained at right-angles to them. A frequency of 112 Mc. corresponds t.o a length The construction shown in the photographs re of just slightly less than 52¾ inches (1.34 meters) quires a little ti.me but the coRt is negligible, and 2 and 116 Mc. to .50 .% 2 inches (1.29 meters). both are well repaid in operating e:i.se if frequent In checking a superregenerative receiver, the measurements are to be made. The support Lecher wires may be similarly coupled to the consists of two 12-foot pieces of "1 by 2" (ac receiver coil. In this ca~e the resonance indica tually about ¾" by 1%") pine fastened together tion may be obtained by setting the receiver just with wood screws to form a, "T" girder, this to the point where the hiss is obtained, then as arrangement being used to minimize bending of the bar is slid along the wires a spot will be f01md the wood when the wires are tightened up. The where the receiver goes out of oscillation. The anchors at the ends are also 1 by 2, cut and distance between two such spots is equal to a half screwed together to make a block. The feet at wavelength. each end keep the ai;sembly from tipping O'::,er In either case, the most accurate readings re when in use. The wires terminate in airplane sult only when the loosest coupling between the type strain insulators at one end, and at the other line and the tank coil which will give a definite in small turnbuckles for taking up the slack. In indication is used. After taking a preliminary the set-up shown, turnbuckles and wire both reading to find the regions along the line in which ea.me from the local five-and-dime store, the wire re,sonance occurs, loosen the coupling until the being bare solid copper antenna wire (hard-drawn) indications are just discernible and repeat the of about No. 16 gauge. The turnbuckles are held measurement. Unless this is done the tuning of .in place by a ~1 6 by 2-inch bolt through the anchor the line will affect the frequency of the oscillator block. This end of t,he line is thus short-circuited; and inaccurate indications will be obtained. As it does not matter whether it is open or shorted the coupling is loosened the resonance points will since the other end is the one connected to the become sharper, which is a further aid to accurate pickup loop. determination of the wavelength. The sliding gadget, also made from pieces of 1 The pick-up loop at the end of the Lecher wires by 2, serves the double purpose of holding the need only be a half turn - aetually just a closed shorting bar and acting as u guide to keep the end to the system. The line may be extended to wire spacing constant. Sheet metal pieces screwed any convenient length to bring the loop near t,he to t,he sides of the i,;liding block are bent under coupling coil, as shown in the photograph. The the horizontal member of t,he "T" to keep the extension should have about the same wire spae,~ block in place. At the back is a horizontal strip ing as the line and should be kept as symmetrical of bakelite to keep the wires pressed close to but as possible; that is, it should have no unnecessary not actually touching the shorting bar. This t,wists or kinks. ( Continued on page 98) e=8 Fig. I -·- Coupling the Lecher wires to a transmitter tank coil. Typical 5tanding-wave TI Bulb ,,--~, - --, distribution fa shown, with positions of the shorting bar at current loops indicated. The c__ -r,._/_,___ ~ ___ ',_,~,---~ ..., ______:_ distance "X" e'{Uals a half wavelength. 7 ' -,"' ,,, __ October 1941 19 * WHAT THE LEAGUE IS DOING * CLASS A CONTINUED: TRANSFER OF insofar as they pertain to the ()Ontinental limits of the U nitetl FREQUENCIES POSTPONED States, BE, AND THEY ARE HEREBY, SUSPENDED UNTIL FURTHER ORDER OF THE COMMISSION; SrncE the publication of our September IT IS FURTHER ORDERED that the.following Tem editorial on the temporary loan of part of our porary Rules Governing Amateur Radio Stations be effective 80-meter band for the aircraft pilot-training during the period of the suspension of the foregoing aections: Temporary Rule 12.111. Frequencieo for 1JXclmivo me of program, two important developments have amateur atation•. - The following bands of frequencies are occurred: allocated exclusively for use by amateur stations subject to (I) The first step in the withdrawal of our fre change with respect to 3650-3800 kilocycles and 3900-3950 quencies, originally expected for September 1st, kilocycles upon further order of the Commission: has been deferred to December 20th, unless 1,750 to 2,050 kilocycles 28,000 to 30,000 kilocycles sooner advanced upon thirty days' notice. No 3,500 to 3,800 kilocycles 56,000 to 60,000 kilocycles 3,900 to 4,000 kilocycles 112,000 to 116,000 kilocycles vacating of S BV R. B ••JEFFREY,* WUGDC SrncE passage of Rule 152.44 by the F.C.C., requiring a procedure for regularly check A 100-1000-kc. oscillator combination ing the frequency of amateur stations, increased with provision for tone modulation for interest has been shown in frequency meters and identification purposes, Simple in de similar measuring equipment. Most of the instru sign, hut capable of quite high accuracy. ments available to the average amateur are quite The cost is low, too. complicated to build and expensive to buy, and it was thought that if a simple and cheap instru ment for frequency checking were available, not harmonic we are hearing, either by identifying only would more hams see fit really to comply adjacent stations or by means of an absorption with the regulations, but they could at the same wavemeter, and then count 100-kc. points be time begin to appreciate some of the fun there is tween the modulated notes with a high degree in being able to know instead of guess at both of accuracy. your own and the other fellow's frequency. In general, we have found frequency meters, Circuit Considerations as distinguished from frequency standards, to be Considerable experimentation with various unsatisfactory for ham use. In order to calibrate types of oscillator circuits, including electron or to reset a frequency meter operating in the coupled, resulted in the choice of the circuit shown amateur bands it is necessary to have a frequency in Fig. 1. It is preferable to the electron-coupled standard also, but if we have a frequency stand circuit for this type of service because it permits · ard the frequency meter is quite unnecessary. So the cathode to be operated at ground potential we have tried to develop a secondary frequency for r.f. and eliminates some of the troubles caused standard which is simple, reasonably accurate, by heater-cathode capacitance appearing across and inexpensive. The one to be described is built the tuned circuit, and changes caused by expan around the old familiar 100-kc. oscillator. How sion of the heater. Perhaps the disadvantages of ever, a 100-kc. oscillator by itself leaves much to the e.c.o. would not be so noticeable if the heaters be desired, as anyone who has tried to use one in were operated in parallel from a 6-volt filament the 10- or 20-meter bands can testify. On the transformer, but with series heaters the separate higher frequencies it is almost impossible to count triode oscillator-pentode amplifier combination 100-kc. beats with any degree of ac curacy, and we are quite likely to find ourselves listening to the 14, 100- kc. beat when we thought we had the 14,000-kc. point. And an un modulated note is also hard to iden tify in the presence of the numerous idling carriers that are often to be found on the higher frequencies. These difficulties are solved by including a 1000-kc. oscillator and an audio oscillator in the frequency standard. This is arranged so that modulation from the audio oscillator can be applied to either the 100-' or the 1000-kc. osciilator, although normally it is applied only to the 1000-kc. signal. This gives us t,he name "Decade," since every tenth heat in the receiver (or monitor) will be modulated. In operation, the har monics practically count themselves. A general view of the decade calibrator. Rotating controls are We can easily locate which 1000-kc. mounted on small individual panels, so that when the unit is installed • 1428 Ridge Ave,. Zanesville, Ohio. in a cabinet no parts need he fastened to the panel. October 1941 23 results in better performance. And it allows the The a.c.-d.c. power supply may look odd, but use of standard, easily obtainable oscillator there are several good reasons for its use. With (,'Oils. no voltage step up, line voltage changes are not ·, In order to keep down the number of tubes the multiplied as they would be if a power transformer 6F7 triode-pentode was chosen for the oscillators. were used, and 90 volts is all that is needed. If The 6F7 pentode section is adequately shielded a higher plate voltage were used, some kind of for r.f. service without neutralization if a tube attenuator network would be required in the shield is used. The use of a triode oscillator and output circuits. There might be an advantage in separate amplifier removes the automatic corre(,' using a filament, transformer and operating the tion for plate voltage changes which is supposed heaters in parallel, in which case an 84 would be to be one of the chief advantages of the e.c.o., substituted for the 25Z5. If this were done, the but this eJfect is of little importance since an filaments could be allowed to run constantly and instrument of this type should always have the standard would always be rnady for use. voltage regulation. In this case, it is secured by However, we omitted the filament transformer in the use of an 874 regulator tube. A VR-105 the interests of economy; the 250-ohm filament would work just as well and costs less, but we resistor was obtained from the junk box! happened to have the 874. It has the advantage All three oscillators employ the same circuit, of regulating at 90 volts; those using a VR-105 a tickler-feedback triode oscillator driving a should be careful to use a low-resistance filter pcntode amplifier. The only reason for the ampli choke designed especially for a.c.-d.c. sets be fier stages is to isolate the oscillators from changes because under low line-voltage conditions, the in loading in the output circuit. With the values drop through the choke may prevent the VR-105 shown, shorting either of the r.f. output terminals from striking. The regulator tube holds the plate to chassis produces a change of only a few cycles voltage constant within one volt from no load to in the oscillator frequency, and no change in the full load; that is, switching on additional oscilla audio oscillator frequency is detectable when its tors does not, under the worst line-voltage condi-. output is shorted to chassis. tions, change the plate voltage more than one The audio oscillator may need some explana volt. The two r.f. amplifiers are allowed to run tion. T1 should be the worst audio transformer constantly to act as a bleeder and further stabilize obtainable, the less core Uw bct.tcr. Most new the plate voltage. transformers are too good for use in an oscillator ~tr Fig. 1 - Circuit Diagram of the Calibrator. R1 - 250 ohms, 25-watt. Ta - B.c. oscillator coil. (Sec text.) Ro-··· 0. 75-mcgohm, ½-watt. RFC1 -·· 80-mh. r.f. choke. Rs - 1250 ohms, I-watt. fU'C2 - 2.5-mh. r.f. choke. R~ - 0.2-megohm, Yi-watt. C1 - 16-µfd., 150-volt electrolytic. R5 - 0.1-megohm, ½-watt. C2 -··• 16-µfd., 150-volt electrolytic. Rs -· 50,000 ohms, ½-watt. Cs, C4, Cs, Co, C12, C1s, Crn -··· 0.01-µfd. paper. R1 - 0. 75-megohm, ½-watt. Cr - 0.5-µfd. paper. Rs - 500 ohms, I-watt. Cs, C15 - IO-µµfd. variable. l{g -· 0.2-megohm, ½-watt. Cg, C1s -100-µµfd. padder. Rio - 50,000 ohms, ½-watt. C10 - 0.1-µfd. paper. Ru -0.75-megohm, ½-watt. Cn, Crn, C11, C20 - 100-µµfd. mica. R12 -·• 500 orum, I-watt. Cu, C21 -··· 50-µµfd. mica. Ria-: 0.1-megohm. C22 - (See text.) Lt - Midget filter choke. S1, S2, Sa, s~ - S.p.s.t. toggle switch. T1 - 3/1 ratio audio. SG - S.p.3-t. rotary (Y rutley 3223JJ. T2 - Interruption oscillator coil (National OSR) X - Link in regulator tube hase. (See text.) 24 QST for circuit as the frequency will be too low. For our purposes we want a frequency of about 400 to 500 eycles, and if the frequency of the audio oscillator is lower than this, it can be raised either by reduc ing the value of C4 (and possibly C3), which will also reduce the power output, or by removing part of the cure of T1. The latter is prefp,rable. Remove enough iron to raise the frequency to about 1000 cycles, then tune the oscillator by adding capacity across the secondary, as shown by C'22. Since all transformers are likely to be differ ent, the size of this condenser will have to be found by trial. In our case, using an old 3/1 ratio audio transformer that dates back to the days of 201A tubes, no tuning condenser or removal of iron was found necessary. It will be noted that two different methods of A.n Dnderside view, showing the general placement modulating the r.f. oscillators were used. This of parts. was the result of trial of several methods, includ ing plate, screen, plate-and-screen, and cathode another after the manner of a.c.-d.c. b.c. sets. All modulation of the amplifiers, and plate modula negative returns are made to a negative bus which tion of the oscillators. The methods shown runs through the set and is insulated from the caused the least reaction on the frequencies of chassis. C1 provides an r.f. and audio ground to the r.f. oscillators. In any case, modulation over the chassis without grounding the line so that the about 20% is not wanted, and this low percentage ehassis may be - in fact it should be - grounded should not affect the frequency of the 1000-kc. during operation. The filament circuit is wired oscillator. In practice, it fa very hard to deter through the link provided in the base of the regu mine an exact zero beat with a modulated note, lator tube ("X" on the diagram) so that the but as nearly as we could tell the application of heater circuit will be open if the regulator is not modulation did not change the frequency of either in its socket. This is not important, but does r.f. oscillator more than 20 or 30 cycles on the prevent errors. fundamental. All zero beat settings should, of course, be made with unmodulated signals. Operating Notes Plate and grid circuits of the amplifier stages Usually a piece of wire from 3 to 10 feet long should be separated from each other as much as connected to l'..ach r.f. output jack will provide possible, and the tubes should be shielded. All sufficient signal in the receiver, or the two r.f. parts must be mounted rigidly to prevent me outputs may be connected together and to a chanical shocks from reacting on the frequency. common antenna. Coupling to the receiver is It was thought advisable to use manufactured varied by changing the length and proximity of coils for T2 and Ta. T2 is an interruption oscillator the antenna on the standard. When first tuning coil used in the separately-quenched 5-meter rigs up the unit, set Cs to half scale, tune in WLW (in of a few years back, and is still available. Ta in the Wl'J3t a station on 600 or 800 kc. should be our setup was the oscillator coil out of an old used) and, with Si on, 84 and S5 off, adjust Cg Philco receiver; a b.c. replacement coil such as until a beat note is heard. Now tune the receiver the Meissner No. 14-1028 or 14-7560, or their toward the high-frequency end of the broadcast 17-9373 phonograph oscillator coil should be en band and see if a beat is heard every 100 kc. tirely satisfactory. The unit is built on a 7 >< 11 You may'have to identify the stations where X l % inch chassis. The two variable condensers beats are heard, unless the receiver dial is known are old midgets of assorted makes cut down 'to to be accurate. Probably the beats will not be one stator and one rotor plate each, and Cs has heard every 100 kc. unless you are lucky. If they double spacing between the two plates. S5 is are more or less than 100 kc. apart, change the mounted on a bracket at the same height as the setting of Co until another beat is heard onWLW, condensers. This type of mounting makes the unit and try again. Eventually a setting of Co will be independent of the cabinet, and thus much easier found that gives a beat on every 100-kc. point to wire and adjust. (i.e., 500, 600, 700, 800, etc.) in the broadcast Aside from keeping plate and grid circuits band. The oscillator is then tuned to 100 kc. separated, no unusual wiring precautions need Now turn S, on and tune the receiver to 1000 kc. be observed. All parts should be tied down, re Adjust 015, with C15 at midscale, until a beat is sistors and condensers supported at both ends heard. Now tune the receiver to 4000 kc. (identi either by socket terminals or by tie points, as a fied as the last 75-meter 'phone) and see if there precaution against vibration. Ordinary hookup is another beat there. If so, check WWV at 5000 wire is run by the shortest route from one point to (Continued on page 94) October 1941 2r. An Inexpensive Automatic Line-Voltage Regulator BY s. t,OBDON TAYLOR.* w2.1c11 Dun1NG a series of reception tests at a t.he voltage applied to the different power supplies portable location difficulty was experienced be in a t,ran.,;niitter. In the case of the plate supply cause of line voltage variations, and in searching for high-power tubes it can.not be used. It can, for some inexpensive, simple and preierably however, be employed to regulate the filament automatic means for maintaining the voltage voltage to such tubes, thus dispensing with the more nearly constant a stunt was worked out manually-controlled rheostat commonly used for which proved so successful that the dope is being this purpose. It might eve..n be possible to use two passed along for the benefit of others whose re or more of the regulator tubes in parallel to take ceiving and transmitting equipment suffers from care of loads up to several hundred watts, but abnormally wide line variations. this is an angle that has not been investigated. The unit to be described can be built up in a half hour or so from parts which cost a total of Principle o.f Operation something over three dollars. Some of the few The heart of this automatic control unit is the parts involved will be found around many shacks, Amperite voltage regulator tube. This is a con reducing the cost by just that much. The regula st,n,nt current device in which any tendency for tion obtained is entirely automatic. Its effective the current to rise above a predetermined value ness is demonstrated by the following measure causes the internal resistance of the tube to in ments made on a set-up in which a Hallicrafters ('rease to offaet the increase in current flow. These SX-17 constituted the load: tubes are standard in twelve current ratings, ranging from the 2A5 for load currents to about [legulated Voltage Une Voltaae A pp/inl In l,nnd 0.24 amp., to the 13A5 for currents of 1.3 to 1.45 100 108 amp. 105 Ill Because the tube is a resistance device it can 110 113 only function to reduce supply voltages. Usually, 115 113 however, widely varying line voltages may be 120 113 125 114 excessive at one hour of the day and subnormal 130 115 at another. An effective voltage regulator must therefore be capable of adding voltage when the While this regulation is not perfect, it is certainly line is low and subtracting it when the line is high. adequate to meet any reasonable requirements To accomplish this a booster transformer is in of ham receiver and transmitter operation. cluded which adds approximately 22.5 volts to The regulator is capable of controlling loads t,he existing line voltage before it is applied to the up to about 165 watts. However, it is e,ntirely Amperite and its load. Thus the initial voltage is feasible to employ seveml such units to regulate always excessive and allows complete freedom for downward control by t,he tube. With high line * 2505 Aqueduct Ave., New York Cit,,. voltage the drop across the Amperite exceeds the boosting voltage with the result that the voltage applied to the load is less than the line voltage. On the other hand, with low line voltage the R drop across the Amperite is less than the boost supplied by the transformer and the voltage line Cord applied to the load will therefore be higher than Piuq rec.eplacle the line. This will be evide..nt from a study of the (output) regulation figures given above. There it will be seen that with line voltages up to 113 the load receives increased voltage while with line volt Fig. 1 --- A four-winding filament transformer is ages above this value the applied voltage is less connected as shown at T, to serve as a voltage boosting than the line. auto-transformer. The Amperite voltage regulator tuhc The booster transformer should preferably be serves as an automatic check valve, ahsorhing surplus capable of providing about 20 to 25 volts boost, voltage and allowing only a normal operating value to he applied to the rel!eiver or transmitter plugged into and the best one found for the purpose was the the output of the regulator. Lafayette Type K-2033 filament transformer. 26 OST for Selecting the Correct Regulator Tube Does your voltage soar in the daytime and Once the regulator has been built it will serve dive at night? If so, you'll he interested in this simple line-,·oltage regulator. lnexpensive't to control any equipment within the current fully automatic, and capable of handling the range of 0.2 to 1.45 amperes by inserting the power taken by lflost devices in which voltage is critical for long life of tubes and other proper Amperite in the socket. To determine components. which type is required it is only necessary to measure the current drawn by the load at normal 115-volt input. If au a.c. ammeter is not available This has three secondaries of 7.5 volts each, rated a one- or two-ohm resistor can be connected in at 3 amp. When these and the primary are all series with the load and the a.c. voltage drop connected in series the result is an autotrans across it measured. Dividing this voltage by the former capable of delivering 1:37.5 volts at a resistance will give the current. normal input of 115 volts. Having determined the current, refer to .Fig. 2 The regulator unit shown in the accompanying and locate the curve in which it falls. The number photograph consists of a wood base on which are at the right-hand end indicates the Amperite mounted the transformer, a 4-prong socket for the type required for this particular load. Best regu Amperite and an ordinary line receptable. The Ia tion will be obtained if the current value falls transformer is mounted with its terminal panel at a point where the voltage drop across the down in order to prevent accidental contact with Amperite will be approximately equal to the its live terminals. The socket and receptable are booster voltage. This will mean that at normal standard Amphenol types which lend themselves line input of 11.5 volts the voltage drop of the readily to breadboard mounting, having a metal Amperite ,iust offsets the boosting voltage with base vvith knockouts through which leads are the result that the output voltage of the regulator brought out the sides. will also be 115 volts and its regulating action To connect the four windings of the trans will center around this value. Should the normal former in series it is necessary, of course, to current value of t.he load fall toward the lower maintain the proper phase relationship if their end of a curve where the drop is around 10 to voltage is to be additive. First connect the 115-volt 16 volts, for instance, regulation will be improved t,,:,,rminals to the line, then cormcct one of them to if the load cw-rent is increased by shunting a one terminal of one of the 7. .5-volt windings. resistor of suitable value across the load. Thus if Properly connected this will provide a total the measured load is 0.81 amp. it can be boosted voltage of 122.5 (assuming the line voltage to to 0.88 amp. (which occurs at the 22,5-volt point be 115). If improperly connected the total volt on the 8A5 curve and therefore equals the booster age will be 107. .5; in such a case the connec value) by a shunt resistor to dissipate the dif tion from tlre 115-volt, winding should be trans ference of 0.07 amp. Its value can be determined ferred to the opposite end of the AMPERITE secondary. Next connect the free I 5 end of "this secondary to an --- I 13-A-5 ~-- ~- 1.4 i-- other 7. .5 volt winding ·to give a 12-A-5 total voltage of 130, and then re 1,3 -±:: ,__ _v -- !..--- i 11-A-5 peat this process with tlre last 1.2 I/ I/ secondary. In case an a.c. volt j , i..----- r 10-A-5 1. I - ,_ ! I// t,, _l--- meter is not available a 115-volt I/, 9-A-5 lamp may be used as an indicator 1.0 .,.v ----- 0. 9 ,r11 -~ 8-A-5 and correct connections judged I/ .___ by its brilliance. A difference of ~ o. 6~ --- 7-A-5 II~ I/"" 7.5 volts will be re,adily notice- ~ 0_7 ~ - able. /1 ,,...... 6-A-5 6- fl~ - I If desired, the regulator can 60v ///,,. 5-A-S be incorporated directly in the as 'J - l"_/1/ 4-A-5 equipment which it is to control. o. 4 'I. The only consideration is that (//,, 3-A-5 o. 3 there must be adequate ventila /j/, ----/ 2-A-5 tion, since the Amperite radiates 0 2 ,, ·-- '/ .,, !.,,'" I eonsiderable heat when operat o. I ing at high line voltage - dis V sipating up to approximately 40 4 8 16 zo 24 26 32 watts in some ca.<,es. VOLTAGE DROP The wiring circuit is shown in Fig. 2 - Chart for use in selecting the correct regulator tube type for any given value of normal load current. Although the chart cuts off at 32 Fig. 1 and requires no elabora volts, all except the lowest current tubes will safely dissipate up to 40 watts tion. and the highest current tubes even more. October 1941 27 Power l'ians. be borne in mind that the resistor may VOLTAGE have to dissipate considerable power and it REGULATOR should be one rated accot1.lingly. The heat dissipated is usually not an important con sideration even where the resistor is mounted -- Normal in the receiver because such dissipation -I . :stand-bl/ cirr:uit occurs only while the receiver or trans o------connections s mitter is idling and when its other com- ponents are running cool. Fig. 3 - Wide var1at10ns in load current, such as those resulting when a receiver constitutes the load and If a controlled circuit is completely opened in its "send-receive" switch is thrown to the stand-by posi the stand-by position no specfal provision has to tion, can be compensated for by automatically inserting be made. \Vhere load variations are instantanc a suitable resistor in the supply line when the switch is thrown. For this purpose a d.p. switch is substituted for ou~, as in the case of modulation peaks in the the usual single pole stand-by switch. The minor circuit audio system, they do not affect the voltage regu "hange required in the receiver is shown here by the lation since the Amperite does not follow varia heavy lines. tions of less than about one second duration. When the regulator is employed to eontrol by dividing the normal line voltage by this cur equipment which draws both filament and plate rent, and in this particular case would be 115 /0.07 power, a problem is presented by the relatively or 1640 oh.ms. This resistor would have to dissi low current flow during the time the tubes are pate 115 >( 0.07, or about 8 watts. A IO-watt heating and before plate current is drawn. During resistor of 1500 or 1750 oh.ms will be close enough. this period the total drain may be only a fraction Where theload values are lower than about 0.8 of the normal value for which the regulator is amp. it will be noticed from Fig. 2 that the curves designed. As a result the voltage is likely to be of the various tubes do not overlap. Thus a normal excessive and regulation negligible. There are drain of 0.58 amp. would fall between the ranges several ways in which this problem can be met. of the 5A5 and the 6A5 Amperites. In such a \Vhere a series resistor has been incorporated case a suitable shunt across the load will bring in the equipment for control by the stand-by the total drain within the range of the 6A5. This switch, as in Fig. 3, it is only necessary that the shunt resistor will, of course, have no effect on switch be in the stand-by position when the equip the operation of the receiver or transmitter ment is turned on. Then when this switch is which constitutes the load. thrown to the operating position, after a Fig. 4 -A more effective switching arrangement. Brigadier General Dawson Olmstead, U. S. A. while the switch is in the No. 2 position and will not damage the tubes. A13 soon as the switch is General Dawson was appointed to the U. S. thrown to position No. 3 the full regulator action Military Academy from Corry, Pa., in 1902. He will be obtained and the voltage will drop to graduated from the Academy in 1906, from the normal. Army Signal School in 1909; from the Command It is believed that one or more of the regulators & General Staff School, with distinction, in 1924; such as described here will prove a boon to many from the Army War College in 1934. hams who are cursed with a line in which voltages Prior to World War I, General Olmstead's run high, low or both. It will save tubes hereto service was primarily in the Field Artillery, al fore made short-lived by high voltages, improve though he served with the Signal Corps by detail operation of equipment that has heretofore suf as early as 1909, being then engaged in the fered from subnormal line supply, and will pro development of wire equipment for the :Field vide a feeling of security which one never has Artillery. During the last war he served in the when he must worry constantly about the condi Office of the Inspector General, A.E.F., and com tion of his lines. manded the 50th and 75th Regiments, F.A. Since the World War he has had a variety of Signal Corps assignments, both in the field and in t,he Office of the Chief Signal Officer. At the latter he has seen duty as Officer in Charge of the Sup New Acting Chief Signal Officer ply Division, as Executive Officer and, at various times, as Acting Chief Signal Officer for pro THE War Department has announced tbe tracted periods. In the field he has been Officer in approaching retirement of Major General Joseph Charge of the Signal Section, New York General 0. Mauborgne, Chief Signal Officer of the Army, Depot, Division Signal Officer and Department as he reaches the end of his four-year tour of duty Signal Officer in Hawaii, Officer in Charge of the as chief of his corps. An acknowledged communi Alaska Communications System and, more re cations expert and a distinguished inventor and a cently, Commanding Gene,ral at Fort Monmouth. member of numerous Washington commissions and boards associated with the defense effort, it is regarded as certain that General Mauborgne will continue to loom large in the communica ~Strays~ tions picture at the Capital, although no an . ~ . nouncements have yet been made. In the recent ZCB contest sponsored by the Relieving him as Acting Chief Signal Officer, A.A.R.S., W8EBR worked WlSC and W2SC in and in all probability due to be appointed the succession. October 1941 29 * U. S. A. CALLING * RADIOLOCATION Write to Mr. Bailey immediately if you think ATTENTION, amateur radio operators who that you are eligible, or if you wish further are electrical engineers or physicists! The Army information. His address is the National Re 1.md Navy still want you! President George W. :;earch Council, 2101 Constitution Avenue, Railey, Chairman of the Radio Section of the Washington, D. C. Office of Scientific Personnel, has sent out an Do not delay. Tell your friends and classmates other call for qualified men to apply at once for to-day of this opportunity. If you know of any commissions in the Signal Corps and the Naval men who are graduating from college in February, Reserve. get in touch with them. If you know of any men The need for trained electronics specialists is who hi1ve had only three years of college study in great and is growing every day. Candidates are physics or electrical engineering, but have had urged to apply for immediate active duty in the training and experience in the field of radio, tell armed forces. There is no more vitally important them also. The Army and Navy's quota of elec way in which you can serve your country than tronics i,;pecialists must be filled soon. By helping under one of these commissions. This is n.n them, you will be playing an important part in ab:,;olutely unique opportunity to be vf service our national defense. Do it, now. The time is and at the same time to learn the operation of short! secret scientific instruments of new invention in INSPECTORS OF EQUIPMENT the field of electronics. The knowledge gained from the duties under these corumissions will be THROUGH t.he Civil Service, the War of inestimable value in later life. Department i~ seeking ",Junior Inspectors, Signal Corps Equipment," to make inspections If you have studied physics or electrical engi neering in college, and are single and between and tests of gear to determine compliance with the ages of 21 and 36, you may be eligible for a specifications, etc., with duty apparently at the commission in the Eleet.ronics Battalion of the plants of contracting manufacturers. The salary Signal Corps. Likewise, if you have majored in is $2000 a year, the senior jobs in the same either physics or electrical engineering, but are service paying $2600 and $3200. Announcement married and between the ages of 21 and 44, you No. 108, unassembled examination. Experience may be qualified for a commission in the Naval in inspecting is not required, except that an Reserve involving 8imilar duties. Applicants applicant must hold a bachelor's degree in must be in good health and must have no electrical or radio engineering and is permitted objection to sE>xvice outside continental United to substitute a year of inspectional experience for States. each year lacking in the required education. To those who are qualified, the Signal Corps U. S. citizens, not over 55, in sound health and offers commissions as Second Lieutenant. The capable of performing arduous duties; rigid physical examination. Those interested should Navy give8 commissions ranging from Ensign through Lieutenant Commander, depending on request application form from the U. S. Civil age and experience. Service office at major cities or from the Secre tary, Board of U. S. Civil Service Examiners, at If you have been drafted, this will not inter fere with your applying for a commission in the any first- or second-class post office. The Navy is also looking for skilled amateurs Electronics Battalion, provided you are other who can inspect components and equipment. We wise qualified. The Signal Corps has the au thority to transfer you. do not have exact details but believe the salaries lie between $1440 and $2000 a year. There is a good possibility of obtaining work in factories in your immediate area. If interested, write to the Do you know of any licensed radio amateur Inspector of Navy Material at t,he address in the acrvices whose duties do not pertain to list: ·radio, who would like to be transferred to other nearest to you in the following duties where his knowledge and skill could be 22 Marietta Street, Atlanta; c/o Bethlehem used to the best advantage? Steel, Bethlehem, Pa.; 141 West .Jackson Blvd., Tell him to write to the Editor of QST, stat Chicago; 35 East 7th Street, Cincinnati; 1405 ing his full name, home addresa, rank, serial number, outfit, location, present duties., and a East 6th Street, Cleveland; Detroit Free Press brief outline of his training and experiencee Bldg., Detroit; 983 Main Street, Hartford; 4521 Perhaps something can be done about it, pel." Produce Plaza, Vernon, Calif.; 30 Church Street, haps not. Anyway, it is worth a letter. New York; 1600 Arch Street, Philadelphia; Smithfield Street, Pittsburgh; 600 Bryant Street, 30 QST for San Francisco; c/o G. E., Schenectady; Colman on "Rotten Construction," but he is still not Building, Seattle. regarded as a humorist; he is simply doing some serious talking in an interesting vein. Charles S. INDUSTRIAL SPECIALISTS Wolfe is becoming QST's star humorist and his THE Civil Service announces the con "Liars" is a tidy piece. He says that "when tinuance of the search for Industrial Specialists, '(foggy' Marconi wormed the first grant out of including men with experience in radio and other the British Post Office folks, he laid the founda electrical equipment, supplies and apparatus. tion on which has arisen one of the finest and most Salaries range from $2600 to $5600 in the various spectacular body of liars this old planet has ever grades. No written examination. Application seen." forms from Civil Service representatives at almost any post office or at, a Civil Service district office. Mention Industrial Spedalists, Announce ment No. 102. WWV Schedules IMMEDIATELY after the ;;tandard fre quency station WWV of the National Bureau of Standards was destroyed by fire November 6th last, a temporary transmitter was established in another building and partial service was begun. The service has now been extended, although still wit,h temporary equipment.. It is on the air con IN October, 1916, QST for the first time tinuously at all times, day and night, and carries sports a two-color cover. It is now a respectable the standard musical· pitch and other features. looking magazine, well out of its swaddling The radio frequency is 5 megacycles per second. clothes. Tuska and Maxim have incorporated the The standard musical pitch carried by the (~ST Publishing Company, Inc., and this is the broadcast is the frequency 440 cycles per second, first number under the new name. corresponding to A above middle C. In addition There is much interest in new and improved there is a pulse every second, heard as a faint tick apparatus. A. H. Grebe describes his beautiful each second when listening to the 440 cycles. station, equipped for both telegraph and 'phone, The pulse lasts 0.005 second, and provides an and the editor savs it is one of the most distin accurate time interval for purposes of physical guished amateur ·stations in the country. Paul measurements. Godley's circuit articles have borne fruit, and this 'The 440-cycle tone is interrupted every five issue contains the first Grebe ad, offering a minutes for one minute in order to give the sta regenerative tuner covering 150--400 meteTs, tion announcement and to provide an interval which Mesco asserts will increase the receiving for the checking of radio measurements based on range of any ordinary station by a hundred times. the standard radio frequency. The announcement The device consists of a tuner only, no tube is the call letters (WWV) in telegraphic code. equipment, and the price is $32.50. DeForest The accuracy of the 5-megacycle frequency, has brought out a ¼-kw. ''Oscillion" or c.w. and of the 440-cycle standard pitch as trans transmitter, the first of its kind that has been mitted, is better than a part in 10,000,000. The mentioned in QST. It is being tested out at time interval marked by the pulse every second is Maxim's stat.ion, lZM, on 600 meters and 'reports accurate to 0.000,01 second. The 1-minute, 4- are sought. It has a single triode with 800 volts minute, and 5-minute intervals marked by the on the plate and a small cooling fan under the beginning and fmding of the announcement peri tube. 'fhe editor commends c. w. transmission but rnfa are accurate t.o a part in 10,000,000. The wonders, "Ifow are we going to get started on beginnings of the announcement periods are so this undamped-wave business'? If an ordinary svnchronized with the basic time service of the spark station decides to install undamped ap 'lJ. S. Naval Observatory t.l1at they mark accu paratus, he shuts himself off from those stat,ions rately the hour and the successive 5-minute pe with whom he has been working but who still riods; this adjustment does not have the extreme have the regular spark system. ··The only way accuracy of the time intp,rvals, but is within a would seem to be for a lot of us to jump in at the small fraction of a second. same time." Further technical curiosity is dis played in the choice of the leading article, "Some )_\,.-Strays :ts Small D.C. Sets," by Bowden Washington, re . ~ . printed from the 1 RE, dealing with impact All amateurs who are also dentists and who excitation transmitters designed for airplanes and plan to attend the eighty-third annual meeting of employing a Chaffee gap (copper and aluminum the American Dental Associat.ion in Houston, in a hydrogen vapor). And meanwhile the argu Texas, on October 27th to 31st are requested to ment of high note versus low note rages furiously. write Dr. A. D. Uhls, W9RGV, 258 Plaza Bank The Old Man crashes through with an article Bldg., Kansas City, Mo. October 1941 31 YLRL, QRV! Ill' ANI.TA BIEN.* \VBTAY Above-··· Verna St. Louis, K7HUT, lives in a village where there is but ARRL. The big flood of the one other white woman. Mississippi was raging. \Vhat mattered the needed ZU QSO "QRV? (I AM READY!)" stamps that new compared to bringing relief or comfort to a grief race of women comprising the Young Ladies stricken parent or emergency supplies to the Radio League. The "Q" signal was recently refugee camps harboring hysterical flood victims? adopted as their motto, and practical demon That's the privilege of "hamming" and the ad strations that they are ready daily unfold before venture behind amateur radio operating. The the eyes of the world. unpredictable elements demand constant pre They called it the "YLRL" when it was organ paredness for any emergency. Whether it is an ized almost two years ago. Ethel Smith, W7FWB, earthquake in California, a hurricane in Con the first president, visioned the organization but necticut, forest fires or relentless flood waters, little dreamed that it would turn out to be such each girl, like her brother ham, is willing and rp,ady a successful idea. With a small band of pioneers, to do her share. the wheels were set in motion. "Worst ice storm in Texas history" flashed Now nearly 250 strong, the YLRL boasts out an Amarillo amateur's message to the world members from the Atlantic shores to the western last November. The streets became clogged with waters and from the Bering Sea to the Caribbean. twisted wires. Among those who braced to ur Alaska, Hawaii, Puerto Rico, Canada, England gency's call was Louise Lacy, W5IKC, l'lth and 43 states of the Union are included in the District YLRL chairman. Excited and tired, roster. Lou carried on, bringing aid to isolated, wreckage Like their brothers of the airways, the girls filled Amarillo. of the YLRL regard their amateur radio as a During that same devastating sleet storm means for public service. which disrupted wire facilities in Michigan, Minnesota and the Texas Panhandle, many "YL's Serve in Emergencies women assisted in relaying urgent telegrams When emergency impends they are ready. which otherwise would have suffered serious Letha Allendorf, W9OUD, SCM of Missouri, was delay. Among the most active was Caroline nicely settled to snag a VU in an African DX Schisler, W9EVT. Western Union later honored contest when she he,ard an urgent call from her with a Public Service award. * 13 WIitshire Road, Moreland Hills, Route 3. Chagrin Naturally, the YL's prefer to be couriers of Falls. Ohlo. good tidings, but if forced to relay tragic words YL's at the Hamfester's picnic in Chicago, 1910. Left to right: Lucille Neudling, W9HTR; Carrie Jones, W9ILH; Ethel Sando, W9QV; Esther Davis, W9EFW; Ella Weichmann, W9UPF; Elvera Dressler, W9TLJ; Julia Morgan W9LRT; Carol Keating, W9WWP, and Edna Cummings, W9IKS. 32 QST for to a heart wnmg witb ,mdnes!:i they do so with the same expediency. And always they are preparing themselves - ready. Charlotte Mc- Caffrey, W2NSL, Ruth Beckwith, WSODI, Marjorie Allen, W2NRC, and dozens of others are training themselves in high-speed code. Mar gie Frazier, W7GXI, belongs to five emergency nets. Should a crisis arise, these girls are ready and willing to do their bit. Ethel Fraser, WlMRC, with her The YL's are proud of Dot Willett, W8UDA. Although blind, she is OM, WllM, recently staged a dem a faultless c.w. op (works 'phone, too). She wrote lyrics for the YLRL onstration of amateur radio for the song, is a teacher of Braille in Flint, Mich. city and police officials of Bridgeport. She took a 2 %-meter transceiver up in a plane and hams with Yerenice organized a radio club which talked to the mayor and other city officials. As dramatized programs over station WMC to a result of their success the local police depart educate the public to amateur services. Then they ment began organizing a nation-wide network of crusaded for old radio sets to be renewed for amateur stations to coiiperate with the Police crippled and needy individuals. The kind-hearted Chiefs' Association of America, and the Frasers citizens of Memphis generously responded, and have been asked to visit other states to put on last Christmas was brighter because of the helpful similar demonstrations. Ellen Hastings, WlKUI, ham spirit. works in the Connecticut State Police u.h.f. net, Many of the YLRL have displayed valor in the a state-wide system providing every State Police serving of mankind, country and community. barracks with emergency communication. This varied outline is merely an attempt to Kay Kibling, W2HXQ, has figured in various present the new type of vigilante action, with no humanitarian activities. In one of her unforget intent to glorify one girl's ,1apabilities above table "watches" she maintained constant com another equally deserving. munication with Millinocket, Maine, when 13-year-old Donn Fendler was lost on Mt. Katah Romance in the Air din for 9 days. Kay has generously arranged Not that it's all serious work in line of duty special programs featuring numerous YLRL girls for YLRL members. There's f1m and romance, over WNYC. She also saw to it that the girl too. leaguers had a special QSL display at the Century Romance - it's "in the air," and it happens in of Progress station, W2USA, of which she was all districts. "Radio mergers" in the ham ranks secretary and station trustee. are on the increase. Someone once referred to It was v~renice Bailey's transmitter at CQ as the "mating call" of tho amateur. Cer W4DOE that, was the voice of W4USA on 10 tainly it has brought mates to a few in the YLRL. meters at the Mid-South Fair. A group of Dixie .Lois Matson, W4FGR, possibly Alabama's YLRL Unit No. 4- New York City. Organized by W2N.AZ, this is the newest local group to be formed. Standing, left to right: Carolyn Anita King, W2NGO; Vi Grossman, W2JZX; Eleanore McGovern, W2MWY; Marjorie Allen, W2NRC. Seated: Leonore Conn, W2NAZ; Marge J<"ischer, W2NAI; Violet Farmer, W2NIN; Wilhelmina 1::rabner, W2MEG. October 1941 33 K6ROJ W9WWP \\9FIIK/1 W9RNO Ella Christensen, K6ROJ, the first Hawaiian member of YI.RL, is outstanding in DX work. Carol Keating, W9WWP, was first vice-president nntil senior year work at the lJ. of Ill. interfered. An expert traffic handler, Agnes Cooley, W9FlIK/4 handled 700 messages during a 3-montb maneuver for the men stationed at Fort Benning (Ga.). Like WlFTJ and W9JTX, Ada L. G. Northrop, W9RNO, is now a "Navy widow." first licellJled YL, wanted to be an old maid, ac got her first license when 13 years old. She cording to the 4th District chairman, Helen dropped it for a time, becoming an NBC actres~. Davy, W4GFO. "Fate had different plans for her, There was an engineer at NBC who was also a however," Helen continues. "Lois started having ham, and . . . Now, while she has several rigs on skeds with James McKinstry at K5AT in the the air, she's valiantly plugging for WAS with a Canal Zone. Now she's Mrs. McKinstry!" tiny 2-watter. Genevieve Capstaff, formerly Formerly a chief surgical nurse, Lola Lippel W2CMK and now W6GRX, also married her man, W4F JR, became interested in radio through instructor, W2CDQ - another NBC engineer. the efforts of W4ECT. He "sold her" not only Organizer of the latest local YLRL unit in his hobby but himself, as well. Lola is a good New York City is another YLRLeaguer with still traffic-handler and in one month recently han another NBC romance---" Lenore Kingston Conn, dled a total of 2548. Helen Pallme, W9WVX, also W2NAZ, ex-W9CHD and former 9th Distri('t met her OM, W9KOA, "on the air." chairman. A popular network radio actress in The "ham lingo" intrigued Alice Stewart, Chicago, when she married W2MSC she eamc to W9GOJ, when she first got a 5-tube set and New ·York and continued with NBC. She and "snooped" on the 160-meter 'phone hams in and Ann McGovern, W2MWY and ex-\V5IRS, arc around St. Louis. "How can I become a ham?" busily engaged in volunteer code teaching to a :she wrote W9WQY, who invited the family over group of women defense trainees intent on also and let her call CQ. She was bait for W9WOS, becoming YLRL'ers. who continued the good-deed program. When he W8TUQ's name was Irene Gedney when she invited her to visit the station she armed herself was staff pianist at WHAM, but then she met with parents and a spice cake whereon his call WSDOD who was control operator at the same letters were spelled out in pecans. He undertook station and now the last name is Gabb. Both are to teach her amateur radio, and dates followed active in the Rochester Amateur Radio Associa naturally. Soon "Rusty" was encouraging Alice tion but took time off not so long ago to enjoy a May with the words: "No amateur license --- no California honeymoon. marriage license." Incentive aroused, both li Then there's pretty Mickey Helland Marglin, eenses followed. whose temporary retirement from the amateur Peggy, the travelling 6th District chairman, radio field had them all guessing. Mickey won VE2Hl W7COX VE4APA WlNJJ "Schoolmarm" Ethel Pick, VE2Ill, who caught the radio fever from her Mapleleaf Signal Corps brother, is now patriotically caring for English guest children. Fran Viers, W7COX, moved from Montana to (of all places) Grand Island, Nebr. The OM was in the pictnre with Maude Phillips, VE4APA, but this being strictly a YL story we chopped him off. Eunice Loyzim, W lNJJ, got interested when her OM, WlBEQ, played an important part in 1936 flood emergency work. 34 QST for W90UD W2NAZ W3CDQ W9ZTU The happy girl at the left is hard-working Letha Allendorf, W90UD, ARRL SCM for Missouri, AARS, SNCS and 9th District YLRL chairman. Lenore Kingston Conn, W2NAZ, is a popular NBC radio actress as well as an enthusiastic amateur. Elizabeth M. Zandonini, W3CDQ, abstracts radio literature in 5 languages and does labora tory work at the .Bureau of Standards. Mickey Helland Marglin, W9ZTU, was the first woman operator to work in an official War Department circuit poundin{1; brass 8 hours per day. recognition as the second op at W9ZTU, sched 2nd Corps Area are Margaret Fischer, W2NAI, uling several cavalry divisions. No less than 734 Clara Reger, W8KYR, Lenore Conn, W2N AZ, messages zipped from her key in 24 days. BPL and Ann McGovern, W2MWY. listing followed. Her hobby paid her dividends, for she was offered a job in the War Department's They're in the Army, 'Too radio station WTY. One day Mickey paid a visit Many of the YLRLeaguers are represented in to a hospital to see a {tirl friend and stopped by other Corps Areas in various capacities. In fact, to visit Sgt. ,Jimmie, the operator of W9THS. the girls are in the Army in a big way. Bea He was confined with a badly-mangled thumb, Austin, W7HHH, Mabel Fewkes, W6OEJ, The t,he result of an accident while on a tank-radio resa Pessoney, W5GXT, Letha Allendorf, detail. On his release he began helping her toward W9OUD, Alice Bourke, W9D:XX, and Enid her commercial. Now she's singing his praises C:uter, W9NBX, are among those receiving both as an operator and as her husband. They AARS instruction in cryptography - a valuable chose Florida for a honeymoon. Left without !t asset in the national emergency, for cryptographic call but the possessor of a 300-watt rig, Mickey clerks are not trained overnight. Nellie Hart, will be back on the bands soon. W7NH, was the first and only overseas op for the Dot Knapp, W2MIY, also accepted a position AARS. A signal honor for a Signal Gal! She later in the War Department. The only AARS woman gave up this position and turned Radio Aide Radio Aide, she was active in the Eastern New counsellor after being DNC and ASNC for a York district. Vi Grossman, 2nd C. A. staff period of about four years. artist and editor of "Scarab," has said: "Don't One of the Army YL's started a private war, blame the boys if they would DASH after DOT although her name's not Helen. She's a red-head for DOT has DASH!" Vi's own hectic years of nnd has green eyes, but her name is Gladys - activity and organization under the call W2JZX Gladys Nichols, WSS.JF. A bear for punishment have rPndered the Army meritorious service. She when it comes to traffic, she is helping the Army was ru:rner-up for the 1938 Paley Award as the group keep its reputation as darned good fighters. result of her outstanding emergency work. Living in Ohio you would think she belonged to Other YLRLeaguers in the AARS net of the that state, but no - Indiana claims her. One of W9NBX W9DBD W7NH WlBDN President Enid Carter, W9NBX, was YLRL's first secretary-treasurer and editor-publisher of "YL Harmonic•." Her place is now filled by Leta Hush, W9DBD, product of Indiana University and organizer of the third YLRL local unit in Greater St. l,ouis. Nellie Hart, W7NH-WLYI, has been AARS overseas station, and is now RaiHo Aide Counsellor. May Smith, WIBDN, one of the ''Manchester Tower Smiths'' has been an active awatt·ur fur more than twenty years. October 1941 35 ~ (I) Mildred Wildman, W8PZA, at present chairman of the 8th District unit, organized the 8th District YLRL net. (2) Louise Fewkes, W6OEJ, is a cryptographer and is interested in the Woman's Air Reserve. (3) Vice-President Marie Corcoran, W8TPZ, is NCS of the 160-meter net of YL's from Maine to Florida. (4) Ruth Brown, WSIZL, an A-1 operator and tratlic-handler, lives in Electra, 'l'ex., near the site used as a setting for the movie ".Boom Town." (5) Helen Davy, W4GFO, regularly makes the BPL; she is also 4th District YLRL chairman. (6) Beatrice Austin, W7HHH, 7th District chairman and wife of Oregon's SCM, is another cryptographer. (7) Mary LeVan, W3FXZ, former 3rd District chairman, is an expert AARS girl; she works DX, too. (8) The author herself Anita Calcagni Bien, W8TAY, organizer of the No. I YLRL Unit in Greater Cleveland and publicity chair man of the organization since its inception. (9) Lida King, WIGQT, capable 1st District chairman, is an expert operator and emphasizes emergency prepared ness. (10) Ethel Fraser, WIMRC, not only operates on 2 Vi hut actively plugs ham radio to mnnicipal and police otlicials. her staunch Indiana supporters has threatened to write a book for the edification of the Buckeyes on "How to Keep Your Women." · Dot Evans, WIFTJ, SCM of Some of the YL's have even seen actual service. New Hampshire and expert con Elizabeth Zandoninni, W3CDQ, a radio aide at test worker, had a radio store the Bureau of Standards, is a former radio school with hubby Lt. Carl Evans, hut he's on active duty in the Navy instructress who taught radio in army camps to so she operates the "CQ Kennels" soldiers who were to be rehabilitated after their now. Won the coveted "Corcoran hospital release. She wore a nifty uniform as a cap" at right by copping top member of the Women's Radio Corps and had a place in first YLRL Anniversary Contest. Also won 1940 SS in rating of Second Lieutenant in the U. S. Signal N.H. Corps. Now she is an Assistant Director of ARRL, and holds a commercial ticket. Elizabeth and that top-ranking cipher buster, Frances Rice, W3AKB, did some ereditable Speaking of operating ability, a number of YL's operating in connection with the recent American have built up outstanding records of accom Red Cross test. The message was sent from Phila plishment in this field. Among them is the presi delphia to Red Cross Hq. in Washington where dent of the YLRL, Enid Carter, W9NBX. Ambi W3CDQ, operating an emergency-powered rig, tfon and intense application to study quickly speedily returned a reply. Needless to say, both saw her hurdle the gap from Class C to Class A city and Red Cross officials were impressed, and (the same day taking her 3rd class radiotele that's what makes amateur radio count. Fran's phone). About the same time i,he passed her record in the latest army code contest was 45 cryptographic exam. Skeds on the ARRL, FTS, w.p.m., by the way. (Continued on page 78) YLRL Unit No. 3-Greater St. Louis. Organized by W9DBD, they made history as the only all-YL group in the 1941 ARRL F'ield Day. Left to right: Louise Baker, W9JTX; Alice-May Stewart, W9GOJ; Virginia Fisher, W9ZIH; Janie Ownbey, \V9LUM; Helen Pallme, W9WVX; Joanna Harnes, W9JWJ; Helen Thompson, W9JPT; Marie Van Aller, W9PFO, and Carrie Jones, W9ILH. (W9ONW and W9DBD not in picture.) (}dober 1941 37 A.Ill CORPS Cpl. Pavlinko, :3.JCY, maintains radio equip ScoTT FIELD must be about the easiest ment of the 22nd Pursuit Sqdn. at Ponce, P. R., location in the world from which to get answers to while at Borinquen Field we find Staff Sgt. Lentz, CQ's, judging by the number of hams who are or 3EZH, and Pvt. Wolff, 9CRK. Pvt. Eavey is have been there. This month we find Trbovich, getting 9HAI modified to Chanute Field, ill., for XVKD; Whitener, 5ITX; Huffcutt,, 9ULB; hams of the 10th Air Base Gp. Raoul Escallicr, Pribyl, 9OMC; Lynch, SVSC_; Davidson, 9LCB; 6LST, has distinction of working aboard the Miller, 4UWB; McDonnell, 9JPL; Drees, UIYM_; world's largest warplane, the Army's B-19. Riley, 5HFM, and Coggin, 9SHN, attending the Pvt. Price, 9NFY, at Wheeler Field, Hawaii, Air Corps school for training of radio operators await,s an opportunity to pound brass in a flying :ind mechanics. More of the gang in the Air fortress. Pvt. Reinhardt, 3IIX, monitors airway Corps include Capt. Gardenhire, 7ATC, 17th channels at Mitchel Field, N. Y. Brooks, 4EDJ, Homb. Gp., McChord Field, Wash.; Capt. is a flying cadet at Chanute Field, Ill. How we Martin, 3JDI, and Staff Sgt. Michael, 3EOG, hams do get around! Middletown, Pa., Air Depot; Sgt. Norris, 4HDU, 105th Obs. Sqdn., Birmingham, Ala.; and Capt. NAVY MacKellar, K6OWJ, 5th Bomb. Gp., Hickam I.T. BEST, lBIG and a former New Eng Firld, Hawaii; Pvts. Toole, 9NZK, and Lang, land Division director, is in communications at RFYF, operate point-to-point nets from Langley the new naval operating base at Bermuda. Lt. FiPld, Va. Pvt. Willburn, 9IGE, has been as Biele, 2AOS, is on duty in the D.C.O.'s office, signed to the 87th Bomb. Sqdn., Lowry Field, Philadelphia. F,ns. Dausman, 5ELR, has duties Colo. A bit farther west is Pvt. FariPs, 6OOU, as radio material officer, 8th Naval District, New with the 42nd Bomb. Gp. at Ft. Douglas, Utah. Orleans, and Lt. (jg) Goldsmith, 5CSL, has sim ilar work at Corpus Christi, Texas, where Ens. Lamb, lEMH, is coding officpr. Lt. (jg) Mac Gregor, 8VKV, is an inspector of radio material in the Navy's Chicago office. Lt. (jg) Dana, 4AGR, is Asst. D.U.O. of the Key West, Fla., naval station. Lt. (jg) Hudgins, 6CIW, holds the position of Asst. C.O. at the San Diego naval air station. Lt. Pickard, 2ADL, is assigned to the Pensacola, Fla., air station. Communications officer of the Paducah is Lt. (jg) Walker, 9KNR. Ens. Olver, tiSXK, is third mate aboard the Fly ing Cloud. Ens. Hummel, SMOT, has an assign ment as Asst. C.O. of the Inshore Patrol, Cape May, N. ,J. Normally aboard the Paducah: RMlC Burch, \JWKJ; RM3C Armstrong, \JUQP; Noll, 2IISR, and Chinclli, SWCQ, when ashore operate in a The Navy apparently cannot ~et along without Lt.-<.:omdr. Fred H. Schnell. W9lJZ. who has bet•n 2½-mcter net! RM3C Schuele, 7DXL; Lynch, called to active duty as Ninth Naval District eommu .. 7FOV, and Fowler, 7ILM, arc with the fleet in nications Officer - the first t.hne a reHervist ever h..-ld that important post., supf'rvising all communications the Islands. RM3C Terry, ex-7BFC, is aboard in the thirtir.en midwestern states eomprising th~ the Dent, San Diego. In training at Indianapolii; larg~st naval district.. Schnell'.snavalexperience began tluring World War I; he handled the armistice mf's- are S2C Brown, 5IBC; RM3C Skillington, 1,4ages Of that war in the Navy control room at Washing 6BDB; Delancy, 6DFB, and Towler, 5BYY. ton and was chief on the Geo_rge Washington otl .h~r two trips taking President Wilson to and from Eu RMlC Roberson, -iBBS, trains at I{cy West, rope. After the war he first was ARRL's city manager Fla. RM3G Naugle, 0QIII, aboard the Astoria, for Chicago and then, from 1920 to 1926, commun.ica-. tions manager of the League at Hartford. As IMO and Freitas, GOIA, on the Parrakcct, have visual be pioneered amateur two-way transatlantic com and radio communications duties. CRM on the munication, a job which in 1925 resulted in the Navy calling him back (on leave from the League) to ac Sarutoga is Collins, SQN. RM2C Horton, \JIGX, eompany the fl~et on its cruise to Australia, to is assigned to the Norfolk air station. At Floyd de.monstrate with NRRL the value of short wa,·es to the Navy. At present he is on leave of absence as chief Bfmnctt Field, N. Y., on operating watches are: of Chicago's police radio system. CRM Kroger, 2ALL; RM2C Meyer, :iEQF; 38 QST for LaManna, 21IPE; .RMHC Ellis, :!LYG., an The value of' amateur radio in pro\-·idinA'. a quick source of qualified co:m..munication personnel for Uncle Sam's fighting forcel!I during time of national emergency is exemplified in this group of NCR officers called to active duty last Ap~il. They have just finished a special com.munications course at the U.S. Naval Academy postgrad ~ate ~chool, W3TG~ Standing, I. tor., front row - Lts. (jg) Chace, 6BBW, Machen, Perkins, Moser. Berry, Lt. Comdrs. Jenkins, Evans, MacDonald, Willis (instructors), Lts. Ug) F'uld, ex-2BEG, Rosenthal, 2QU, Loyall, Che~.he., 3HZJ. Second row - RnsiJ?,:ns Brewer, 9JFD, McClelland, 9IIFC. Davies, ·7EHO, Davis, F1ox, K6GNV, Jones, 50J, Kroeger, Pos~, K7IFZ. Wood, 8AOZ, Kummerow" Henderson. Third row -Ii}nsigns Martin, 3GDR, Rooney" 2KVP., Millsap, Holl.is, 4AF~, Krause, _Rhodemyre, SVW.J, Bruning, 3E~, Vance, Wa~bsganss, 2LRO, Bernard, 4ELZ. Rear row - Ensigns Frazee, 9WDD, Daniel, 4DUC, von Dohlen, 4HC, Morrin, ~1attoon, Knowl ton, !ATE, McCrudden, Russell, 6PN. Amateurs not in the picture are Ensign van Groos, 6GFY, and Lt. Comdr. (instructor) Giet, 3EUO. October 1941 39 !llilIV; Mackenzie, 3EJU; Oertel, 3ESO; bulin, 3.W.fT; Her ton, 4IIRS, is radio chief of the 181st J<'.A., Camp Forrest. man, 3EUJ; Koontz, 3EDG; Herman, 3FGD; Melton, Tenn. Pvts. Mitchel, 9IJA; McCutchan, 9MOK; Northam, 3FNG; Montgomery, 3.FQB; Price, 3FYJ; Page, 3HCZ; 5KAM, and Bethge, 9lJUY, are among the gang at Camp Bush, 3HJB; Riccobono, 3HPQ-2TI; Bourland, 3HRQ; Shelby, Miss., reporting airplane observation of battery McCabe, 3HUD; McCoy, 3HYS; McVay, 3IKK; Jones, firing. Selectee Pvt. Kay, W9WDB, is a student radio op of 3IOS; Chambers, 3IVE; Huntley, 3JAP; Llebson, 3JDH; the 55th li'.A., Camp Roberts, Cal. Lt. Lynch, 71IVK, has StooPB, 3JDS; Bliss, 3JFO-1FMZ; Blalie, 3JIB-5FFZ; reported for duty at Dutch Harbor, Alaska. Lt. Mack, Hodges, 3JDG; Taylor, 3JLK-8NEL; Mengle, 3JME- SHAN, is ll.&Signed to the 460th Ordnance Co., Ellington 8CL; Peck, 3RL; Fatll!t, 5EHQ; Weimer, SAFX; Dinger, Field, Texas. Sgt. C,'hiuchlolo, 2LWB, plans to set up a 8KG; Ramp, 9SKH, 3JKO and SBJL. trainee traffic station at Ft. Benning, Ga. .Pvt. Scoville, Among the Gallups Island school group of students start SUXD, has 4HSI in operation at Ft. Jackson, S. C. Pvt. ing in July to acquire commercial operator licenses, there is a Martin, 5IYD, enjoys his specialist training at Ft. Bragg, gang of hams mostly "recruited" by QST's story on the N. C. One of the ops at WUU, Ft. Adams, R. I., is .Pvt. .school. They are: Randall, lKVP; Dunham, lLCA; Peduto, Myers. lHEN. lMKL; Porter, lMVM: Burns, lNDE; Veeder, lNLQ; The staff of the 109th Engineers, Camp Claiborne, La., Biornsen, 2JAU; Freedman, :lKCZ; Marsh, 2KTR; Vlee includes Lts. Fite, 9SWV; Nelson, 9YJX; Sgts. Goates, •chouwer, 2MEM; Baker, 2MUII; Warner, 2NJO; Pauer, 9APT; Egge, 9TZJ; Cpl. Zambo, 9ANW, and Pvt. Wright, 2NYW; Smith, 3HDH; Stumpo, 3IFU; Barnes, 3JHS; 9QJJ, all from South Dakota. In the 43rd Division at Camp Breiniak, 3JJE; Galloway, 3JOR; Waldrop, 4HAC; Hen Blanding, Fla., we find Capt. Rounds, ILOZ; Tech. Sgt. derson, 5JEM; Proctor, 5JIK; Hicks, 5JRN; Paisley, Fields, ILTM. and Pvt. Scrutom, lLPA, of the 103rd inf. 6RNT; Olson, 6RWQ; Barnes, 6UAX; Seiss, 7HHL; Soper, Hq. Co.; Staff Sgt. l!'ontaine, lKSR, and Pfc. Abbott, 1IJZ; Schenck, 8RGL; Bouchard, 8SCY; Wallander, tKCO, of the 86th Inf. Brigade; Tech. Sgt. Manley, lBCK: 8TWP; Stevens, 8VWN; Hall, 8WAE; Soper, 9CPL: Tee Staff Sgt. Hope, lKOO; Sgt. Buxton, lKVY, and Pfc. garden, 9FSI; Quinn, 9GZZ; Doil, 9HSA, Meyer, 91TH; Stevenson, !CUN, of the 172nd Inf. Hq. Co.; Sgt. Hanson, Buckles, 9JUN; Gussman, 9MDB: Ricker, 9MUQ; Hane, INAM. of the 102nd Inf.; Pfc. Lindscott, ILIC, of the 68th 9MYR; Clough, 9OMU; Lee, 9PBW; Tomlin, 9ULO, and .F.A. Hq. Btry.; Capt. Heartz, lFQ; Mstr. Sgt. Delahunt, Bellman, 9VQE. lCEM; Staff Sgt. Hatch, lAWY; Pfce. Kenney, lLEV, and LaForge, lMLX, of the 152nd F.A.; Staff Sgt. Tet reault, lKZN, of the 103rd F.A.; and Staff Sgt. Root, lIFY, AllMY, General of the 192nd F.A. Lt. Hunt, 5TG-CCU, is radio officer of Ellington Field, £oNGRATULATIONB to League Director Cavene.is.'3, Texas, where also is stationed Capt. Borden, 5DOC. Cal 4DW, promoted to the rank of Major. Staff Sgt. Tarking- (Continued on page 60) Navy Day Receiving Competition To Be Held on October 27th A MESSAGE to radio amateurs from the Secretary of the Navy will be transmitted on Navy Day, October 27th. In connection with this message A.R.R.L. will conduct the Seven teenth Annual Navy Day Receiving Competition. All amateurs are invited to take part in this activity, which constitutes amateur radio's participation in the celebration of Navy Day. Two messages will be transmitted, one from Radio Washington (NAA), the other from Radio San Francisco (NPG). These messages will be substantially the same in thought but will vary slightly in wording. A letter of appreciation from the Navy Department will be sent to every amateur who makes perfect copy of the text of one message. Should characters for any reason be transmitted with improper spacing such as from tape-punching errors, words containing such characters will not be counted in the grading of papers. Both messages may be copied, but only the best copy should be submitted in the competition. It is not necessary to copy both sta tions, and no extra credit is given for so doing. However, if both stations should be copied, please mention the fact when submitting your best copy so that the number of operators copying each station may be ascertained. Only the text (including any punctuation therein) of each message will count (not the preamble, break signs, and the like). Copy what you hear. Do not guess! Credit will of course be deducted for logging anything that was not actually transmitted!! Mail copies for grading to the A.R.R.L. Communications Department, West Hartford, Conn. Send your original copies - recopying invites errors. An Honor Roll of letter winners and all other participants will appear in QST. The relative standings of the various Naval Districts will be determined by comparing the number of letters awarded with the number of copies sub mitted from each District. In submitting copy please mention it if you are a member of the Naval Service. Transmissions will be at approximately 25 words per minute and will be preceded by a five minute CQ call on the following schedule: F'rom Washington: NAA, 9:00 P.M., E.S.T., simul taneously on 4525 and 9050 kc. From San Francisco: NPG, 7:30 P.M., P.S.T., simultaneously on 4045 and 9090 kc. 40 QST for Predictions of Useful Distances for Amateur Radio Communication in October, November, and December 1941 National Bureau of Standards Washington,». C. T HEBE predictions are for distance ranges field-intensity measurements at Washington. For in the five amateur frequency bands regularly information on radio wave transmission see useful for long-distance sky-wave transmission, pamphlets obtainable from National Bureau of during October, November, and December, 1941. Standards, Washington, D. C., "Radio transmis They are based on long-distance reception ob sion and the ionosphere," and "Distance ranges servations at various places and ionosphere and of radio waves." PREDICTED FOR OCTOBER 1941 PREDICTED FOR NOVEMBER 1941 '50 0 2 4 G 8 10 12 14 16 18 20 22 O 0 2 4 6 8 10 12 14 16 18 20 22 0 2 0 2500 II '\ ·- I 2000 II II '' I 2000 .;, I- w I- 1500 ~ 1500 ., w 0: iii 0: ., ~ z 28 MC z z 28 MC 1000 f- i!it ., ~ 1000 iii ~ SKIP SKIP 500 Ii II 500 " t:J::.tj:tt:t:l:t:tij:!t:t!:t:J:Jt!l:1:1::tl:l 0 ;::f-r;:;:+-•-::-=:f-+:;::.::' .:;-.;:::-~:::-:;:+--r::::;:--t,--,:~--1 o - ~lli.f.f111 .. "' ~~-~•. "' 2500 ~2~01-+-H--t-+-+-H-+l+-lf-.+-++-Ji--w.+t+-t-···+T··-+·~ t- i 2000 l--'--+--<-+-+-+'+--f+-l-+-+--1--++-+-,+-..+-+-1-+-+-+-< 2000 f- 1 .. > .. IMO ++~--l-'\--""'.li>f- ·t-';,..'F.'t' -+~1..++-1-++-t-HH 1--+. .,_>---+,'+-- •• & ~~ .' 7 MC IOOO ·1';;1; ...... ~.- ~+-+-+++-±al I I 500 SKIP +-t++-t--+f-_t-++--t--!HH-..!"-.KtP 0 ~00 2000 -+-+1·-+-t--t'iH--t-+-++-1-++-+-P.-+-+--t--li-++-1 2000 •. :, •• .. •• .. 1-+-H--t-+1-!l-+-l-±cHccH I· I I lcW ., --l---t--t-++-+--l 1'500 . ,.}..t-..¼..I•'"'· ,;J.7l-,J--r--t---H-+-t--t-tci!H:.,.-.¼.-,W~ I I . 4 MC ,~oo i--++-<-+->-+-½\ili,,.,- . ~ .J._.J: f= 4 MC 10001-t-+++++ l- "tj~ ~ t-i,~t1on1+-1--+-+-+-H 1000 Grr: y- ~ .: ... ,~ !- .·· ,_ !iOO ·I ~ 1_,_.,.·-~·-•.,..,...... ,_,_,.:Phr•·.-+++-+~ 500r++-+--+-H-~~~1-+r+-1-++-+-+-+-+-H--+-+-1 O Ll':::J- _ I II 0 ~ ···- ...... r- ~oo~~~~=~~··,,·,r--,-,~r,--,--,---,--r,-, 2500 1 2000 tt::t::1=tt;t~:t:t:t::t:tt:t::tjt~t::tj:tt::tj 2000 ... -l +-•-+-..,.,,-H--+-+-+--<-- -+-+-+--H-':i·t,t::t::1:t:::t:t::t 1500 ~- m: =~+1-++-+--1 l!SOO Ll~ ~. i 2 MC l+-+-l---t--t---ia5H-++-++-H-+-<·~,~-+-+-+-f-+-+-< 2 MC l0OO H--H-++';?5H---t--+-++-H-+-++-,P..::,5--t-+-l-+-H 1000 .. • - r-1.+..-+-++-t--1-++t.-i,."'-· +-t-· ~c.. ~"' 1 '500 •• •• • • • •• • •...... ~- 1...... 500H·+--t---l-t-+-f-'Jc--l-,cl..tc±c~~-f'-¼'-l"--t-+-++-H--1 o1 o cw e'I ~ DliT~i.ii;;' •• .,,. 00 02 04 06 08 10 12 14 16 18 20 22 00 'l,o 02 04 os 08 10 12 14 ,. 19 20 22 oo LOCAL TIME AT PLACE OF REFLECTION LOCAL TIME AT PLACE OF REFLECTION Fig. 1. Useful distances for radio wave propagation Fig. 2. Useful distances for radio wave propagation via the regular layers of the ionosphere, predicted for via the regular layers of the ionosphere, predicted for October, 1941. The solid graphs show the skip zone; the November, 1941. The solid graphs show the skip zone; dotted graphs show the upper limits of useful distances. the dotted graphs show the upper limits of useful dis The 56-Mc. hand will he nseful only for local trans tances. The 56-Mc. band will he useful only for local mission (optical and quasi-optical paths). transmission (optical and quasi-optical paths). October 1941 41 PREDICTED FOR DECEMBER 1941 ample, at 17 o'clock on a day in November the average skip distance for 14 Mc. will lie 1200 miles: the skip distance will almost always be greater than 900 miles and almost never be greater than 1500 miles. · As winter approaches, the following important differences in transmission will occur: decreased absorption and static, and consequently greater useful distance ranges; decreased day skip dis tances and increased night skip distances, for transmission via the regular layers; great decrease in sporadic-E transmission and thus a decrease in irregular transmissions at 28 Mc. and 56 Mc. at SKIP.LI...UU-I-LL.LI.-1-L-l-LIW...'"'1-,5K1P distances exceeding about 400 miles; regular day transmissions at 28 Mc. during October and November. Get Your Code Proficiency Award EVERY U. S. A. amateur licensee is invited by ARRL to get this certification and recognition 25001-1----.L.L-l-l-l-! l:t.' ..L..J-1-LL.L.L-Ci:: In Two Parts-Part II* UY E. L. BATTEY,•* WIUE di), which is actually the letters AE sent together Correct Character Formations as one character. Always bear in mind that the ONCE the dot-rhythm and dash-rhythm space between any parts of a character is the same have been mastered, we can proceed to the con length as a "di." Next try an L (di-dah-di-di), sideration of the correct formation of each charac which is actually Al sent as one character. Next ter. This is an important consideration, for if we send W (di-dah-dah), thinking of it as A'l' sent do not make every letter and numeral correctly together. If you can send A successfully, you can we will never send good code. There can be no send R, L and W similarly. The letter J (di-dah characters sent incorrectly. It is one thing to dah-dah) should be thought of as WT sent to know how we want a character to sound but gether. The numeral 1 (di-dah-dah-dah-dah) another thing to make it sound that way! Let's should be considered as JT sent as a single analyze the correct manner in which to make character. It will be noticed that these combina each character. Starting with the ba1:1ic letters, E tions give a smooth continuity for each character. and T, practically every character is composed of The letter P (di-dah-dah-di) should be considered combinations of other characters. A study of the as WE sent as one smooth character. Care must correct rhythm for each character (how it sounds be taken in sending each of these characters that when sent correctly) discloses that certain groups no additional space is left between the two letters of letters and numerals a1·e associated. It is urged making up the complete character. For example: that you practice the characters in accordance although Pis WE, take care that you do not leave with the following plan. The letters listed in each more than one-dot length between the W and E. group are more or less associated and it is recom The overscore indicates that the two letters are mended that practice be "by groups," with each sent rhythmically as one sound (di-dah-dah-di). letter ma1:1tered in the order given within each Group No. 4: The characters U, F, 2, V, 3 and group. 4. Master first the letter U (di-di-dah). Do not Group No. 1: The characters E, I, S, Hand 5. t,hink of U as any combination of letters; think of These have been covered under the heading of it only as "di-di-dah" sent smoothly. (A danger ''Developing Rhythm." With the correct dot ous misconception is to think of U as the letters rhythm mastered, you can send all of these dot IT; avoid this, or your character is apt to sound characters. If you experience any difficulty, go jerky.) Think only of the sound "di-di-dah." back and send a series of evenly-spaced dots Next, tackle the letter F (di-di-dah-di), using the (Di-di-di-di-di-di-di, etc.). When your wrist re basic letter U as a foundation. F is actually UE sponds, send a 5, using the same rhythm as for the sent as one character. If you can send U, you can longer series . . . send an H likewise, etc. This send F. The numeral 2 (di-di-dah-dah-dah) is Harne dot-rhythm carries over into other charac made up of the letters UM sent together; think of ters which are made up of dot-dash combinations. it this way and you will get a smooth 2. The letter Group No. 2: The characters T, M, 0 and~ V (di-di-di-dah) must not be considered as any 'l'hese were covered under the subject of correct combination of letters. (A common fault is to con dash-rhythm. Little difficulty is usually encoun sider V as ST, resulting in a jerky character.) t,ered in making dash-characters. If, however, you Think of V only as the sound-combination di-di find yourself sending them jerkily, go back and di-dah. Practice this, using the dot-rhythm, until practice the dash-series-exercise (Dah-dah-dah you send a smooth letter V. One of the most diffi dah-dah-dah-dah-dah, etc.) until you regain the cult characters for many operators is the numeral feel of this action. 3 (di-di-di-dah-dah); it is too often sent jerkily Group No. 3: The characters A, R, L, W, J, 1 (as SM). To send a smooth numeral 3, think of it and P. ThP,se all have as their groundwork the as VT sent together; there you will have the letter A (di-dah). First ma1:1ter that letter by send smooth continuity of a correct 3. Conquer the ing several times a smooth di-dah, di-dah, di-dah, letter V, and you will have no trouble making 3. keeping the space between the "di" and "dah" The numeral 4 must be considered only as the equal only to one "di." Then send an R (di-dah- sound-combination di-di-di-di-dah. Do not at tempt to consider the 4 as composed of any * Part I appearer! in September QST. letter-combinations (as HT), or you will get a ** ~..\ssistant Communications Manager, A.R.R.L., on leave of absence; Ensign, USNR; instructor, Naval Reserve jerky character. In sending the 4, use the same Radio School, Noroton Heights, Conn, dot-rhythm as you do for the 5, making the last October 1941 43 unit a dash instead of a dot (di-di-di-di--dah). Probably t,he most troublesome of all letters Group No. 5: The characters N, D, B, 6, 8, 9 is C (dah-di-dah-di). In order to get a smooth and X. The N, of course, is merely a reversal of A. character C it is recommended that it be thought Practice the N (dah-di) by sending several times of as the combination KE sent as one character. a smooth dah-di, dah-di, dah-di, keeping the Here you will find a smooth rhythm, as oppose.d to space between the "dah" and "di" equal only to the combination TR or NN, which are almost one "di." In making a D (dah-di-di), avoid mak 1:>'ure to result in jerkiness. In actual practice ing it sound jerky (as TI). Think of it only as the many operators have found the RE combination combination of sounds dah-di-di, sent evenly. their answer to correct formation for the letter C. Likewise, the letter B (dah-di-di-di) must be Similarly, the letter Y (dah-di-dah-dah) should thought of only as the combination dah-di-di-di. he considered as RT, sent together smoothly, (It is a mistake to think of B as a letter-combina as opposed to TW or NM. l{T will give you a tion, such as TS; this results in a jerky character.) rhythmic Y. Master the letter K and you will The numeral 6 calls for the same rhythm as a have no trouble with C or Y. numeral 5, except that our first unit is a "dah" In all of the above examples, it should be em rather than a "di." Think of 6 only as the smooth phasized that the overscored letter-combinations sound-combination dali-di-di-di-di, evenly spaced. represent one sound-combination, not the two The numeral 8 (dah-dah-dah-di-di) must not be sounds of each individual letter concerned. For considered as the combination OI; this results in example: RT stands for dah-di-dah-dah (Y), one jerkiness. It is best to think of it only as the rhythmic sound; not dah-di-dah space dah, two rhythmic combination dah-dah-dah-di-di. How separate letter-sounds. In practicing all charac ever, the combination Mb, with care taken not to ters, repeat the sound of them aloud to yourself. le.ave additional space between Mand D, will give (Example: In practicing B, repeat to yourself you a correct 8. The numeral 9 (dah-dah-dah dab-di-di-di, dah-di-di-di, dah-di-di-di, etc.) dah-di) calls for the same dash-rhythm as does Determine your difficult characters and prac the numeral !2), with the exception that the last tice them until you master them. With the cor unit is a "di" instead of a "dah." The letter X rect formation of each character as a basis we can (dah-di-di-dah) should be considered only as the proceed to combine them into words, giving con combination dah-di-di-dah. (Avoid thinking of it sideration to correct spacing betweim characters as letter-combinations, such as DT or TU; these and between words. With incorrect formation of tend to result in a jerky character.) In practicing even one character, our sending will lack that X, think only of the rhythmic dah-di-di-dah, "something" which distinguishes between the dah~di-di-dah, dah-di-di-dah. perfect sender and the run-of~the-mill. That is Group No. 6: The characters G, Q, Z, 7, K, C why we must first consider each character sepa and Y. Consider the letter G (dah-dah-di) as the rately and practice each separately until we sound-combination dah-dah-di. With care to keep master them all. Then, and then only, should we the spacing correct it might be thought of as ME start sending words. sent together, but it should never be thought of as Operators find that their difficult letters are not TN. (This usually results in an uneven character.) always the difficult letters of other operators. Next, send a Q (dah-dah-di-dah), considering it However, there are ce.rtain characters which are as MA sent as one character. (Avoid thinking of generally found more difficult than others to send. Q as GT, which makes for jerkiness.) The letter Z As a sidelight on this, a group of some 350 be• (dah-dah-di-di) may be considered as TD sent ginning operators were asked which characters together smoothly, although it is better to con they found most difficult to send correctly. Their sider it only as the sound dah-dah-di-di The nu answers showed the following: Approximately meral 7 (dah-dah-di-di-di) can safely be considered 17% found the letter C most difficult; 15% had only as the sound-combination dah-dah-di-di-di, trouble with the numeral 6; 13% found the Hent evenly. (A common mistake is to think of 7 numeral 4 difficult; 11 %, the numeral 3; 10%, as MS, a jerky combination.) The letter K (dah letter V; 9%, F; 8%, numeral 5; 7.6%, L; 7%, H; di-dah) must be thought of only as the sound dah tl.5%, Y; 6%, P; 5.7%, X. Other difficult charac di-dah, smoothly executed. (Do not think of K ters were, in order, B, 2, 9, q, 7, G, R and Z. as any letter-combinations, as TA or NT, both Those giving none of the 350 men trouble were resulting in unevenness.) only A, E, I, T, M and W. Some General Considerations Aim to send perfect code. Keep your speed at the level at which you make a minimum of errors. Accuracy and perfection come first - speed will come with practice. "Learn by Sending": Experienced operators say that constant sending-practice builds copying ability. You not only improve your fist but you 44 OST lor also increase your copying ability by sending to yourself (on an oscillator or buzzer). The three fundamentals of a 11;ood fist: (1) Cor rect rhythm and wrist action; (2) correct forma tion of characters; (3) correct spacing. And all three are interdependent. Don't rush your dots. Send dots at the same speed you send dashes. \Vhen you come to dots, don't think you have to rush them or jam them together. You can make dots just as easily as dashes. Try at all times to make all dots the :;ame length, and all dashes the same length. Be satisfied only with good code -- know how Examples of running characters together: - perfect code sounds and strive to make your send Sending PD for AND, NST for TEST, etc. ing sound the same. Don't send "choppy" code. Do not clip either Don't run characters or parts-of-characters dots or dashes. Keep them uniform. together. Keep equal space between all parts of Always send the correct number of dots for all characters. Keep each "Character separated the character concerned. Ditto dashes. Don't from adjacent characters by proper spacing. Rend five dots for H, four dots for 5, dah-di-di-di di-di-di-di-di for 6, etc. Don't send dah-dah-dah dah-dah-dah-di for 9, or di-dah-dah-dah-dah-dah for 1, etc, There is but one way to send each ('haracter - the right way. TABLE OF COURECT SOUND• (;Ol\IBINATIONS Certain adjacent letters are easily run together unless care is taken. Watch for such combinations For Sending l'ractice ai; TK, TE, TH, AN, AI, TR, etc., which may Consider each letter as its individual rhyth easily be misinterpreted as one character if run rnic sound-combination. If you have difficulty together. forming certain letters, to make them sound right, try the letter-combinations suggested, Request criticism of your sending from good tnastering the first letter, then adding the sec operators of your acquaintance ot· from those ond unit, sending the whole as one character. ;~ontacted on the air. They may notice some slight A - di-dah (not ET) fault you could easily correct. B - dah-di-di-di (not TS) 1n sending, as in receiving, think of each char C - dah-di-dah-di. or KE (not TR or NN) acter as a sound, rather than combinations of .0 - dah-di-di (not Tl) E-dl dots and dashes. Say them aloud to yourself as ~· - di-di-dah-dl, or UE (not IN) you practice sending. Keep your keying in G - dah-dah-dl, or ME (not TN or TTE) ~ynchronism with your vocal accompaniment. H - di-di-di-di I ·-di-di Take pride in your sending. On the air, someone J - di-dah-dah-dah, or WT (not EO or AM) is always listening to you. You will be judged by K - dah-di-dah (not TA or NT) vour fist. f. - di-dab-di-di, or AI (not ED) · Avoid repetitiom,, but if an error is made, al M -dah-dah N - dah-dl (not TE) ways correct it before continuing. 0 - dah-dah-dah (not TTT) A common fault is to leave too-long spaces P - di-dah-dah-di, or WE (not EG or AN) between parts of characters, especially where a Q - dah-dah-dl-dah, or MA (not GT) "di" and "dah" come together. Example: Nu R - di-dah-di, or AE (not EN) S -di-di-di meral 3 . . • too much space often is left between T-dah the ",:ti's" and the first "dah," making it soimd CJ - di-di-dah (not IT) like SM. V ·- di-di-di-dah (not ST) W - di-dah-dah, or AT (not EM) Don't "split" your words by pausing in the X: - dah-di-di-dah (not DT or TU) middle of them. Keep equal space between all Y - dah-di-dah-dah, or KT (not TW or NM) letters of any word. Letters should be separated Z - dah-dah-di-di, or MI by a space equal in length to the length of a dash. I -- dl-dah-dah-dah-dah, o!.J_T 2 - di-di-dah-dah-dah, or UM (not 10) ;1 -- dl-di-dl-dah-dah, or VT (not SM) ),;,; Straw :Js ·l - di-di-dl-di-dah . ~ . :; - di-di-di-di-di The F.C.C. has designated for hearing an ap 6 - dah-di-di-di-di (not 'IB) 7 - dah-dah-di-di-di (not MS) plication for construction permit for two porta 8 - dah-dah-dah-dl-di, or MD (not 01) ble experimental stations to operate on frequen 9 - dah-dah-dah-dah-di cies between 300 and 400 Mc. Applicant proposes 0 - dah-dah-dah-dah-dah t.o develop a new radio system to replace the con ventional automobile horn! Ho-hum! October 1941 45 ARRL Battery-Powered Equipment Test tlctober I.8th-19th-Check UHF and/or LF Bigs in Saturdau Noon to JO P. ~I. Sandau Contest-Everubodu .lnvited-Emergencu Corps iJ.lembers Urged to Talw Part BY F. E. HANDY,* WIBDI IT'S !<'UN to test out the capabilities of make them work, that can be used afield near the portable self-powered equipment at any time. lt car, at the home 8tation when commercial power is a duty every responsible amat_eur owes himself is unavailable, nr from other place~ Hhould and his hobby to have and test equipment for emergency require. pussible emergency uses before the blizzard, In this test if you can go to a location away storm, flood or hurricane season, and especially in from t,he home station by all means do so. You these times to make sure his equipment is right. will meet more unknown factors and have some A willingness to 1:mrve is but a part of the measure of the FD thrills and be credited with an appro of our potential usefulness. The practical ability priate multiplier. Since there are those who can to serve must supplement our commendable will not go afield this is not a requirement. Genemotor ingness. This ability is achieved (1) through vibrapack-bat tery stations with both receiver and building and holding ready numerous complete transmitter operating independent of commercial amateur equipments of the type with handles on mains can be tested right al home .~talion.~, even on 'un and (2) by operating-testing of the gear at home antennas. intervals in practical workouts. When so operated participants must include a There is no laboratory te,;;t like the test of signed statement that entirely self-powered equip iwtual experience. That i..~· why an ARRL October ment was utilized in connection with all points contest to refresh our experience in setting up, to claimed. disclose any items not up to standard in our equipment, to stimulate making new individual VHF and LF Work Score Separately self-powered stations ready for portable utiliza UHF arid low-frequency operation cover widely tion is on the books for number one test this fall. different conditions. Independent score listings There never have been enough individual port for above-56- and below-56-Mc., therefore, will be ables ready before general emergencies to take made. Participants are welcome to use transmit advantage of more than part of the opportunities ters taking not more than 30-watts input to final, for rendering useful service. All FCC licensees, and to report ou work for either one ur both score whatever their equipment, are invited to register 1 listings. Voice or telegraph work may be entered, in the ARRL Emergency Corps, giving radio or a combination of both. Points made using <·overage of points not in networks and creating transmitter on 56 Mc. and higher frequency bands groups of amateurs organized for practical will be recorded in one UHF list. All points re emergency needs in the larger towns. Nearly 3500 corded in the contest period with one's transmit istations are in the Corps now, 31 % of these self ter on amateur bands below 56 Mc. will be in a powPred with others pledged to complete such separate LF list. Should a UHF and LF station gear as soon as possible. This activity is one in hook up the points will be listed as determined centive to do sp. Every amateur, whether AEC by the transmitter frequency of the reporting yet, or not, should get in this low-power test of operator. battery-powered equipment. 1. Operating Tune: Starts Saturday, Oct. Considerable progress has been made through 18th, 12:01 P.M. local time. Ends Sunday, the annual Field Days in adding to our store of Oct. 19th, 10:00 P.M. local time. UHF Points gas-driven equipments. Those FD's will be con may be made without limit within above tinued. But we also need more individual-class period. Low Frequency Points must all be lightweight, portable setups, wholly self-powered made 12:01 P.M. to sunset local time Saturday, and capable of quick movement and installation and during the hours between local sunrise in minimum time. This new test is aimed at this and sunset Sunday. All low-frequency battery latter field in which we hope like progress may powered testing afield, or awny frorri the home i;oon be made. Amateur radio needs more battery station location (of equipment .for domestic com powered portables that need only a car battery to rnnnications emergencies) rr._iust, of course, follow 48-hours advance notice to the FCC Inspector * Communications Manager, ARRL. of the district in which the operation will take 1 A postal to liq. will bring the AEC registration blanks t,o be filled out in duplicate and returned. place per Temporary FCC Order No. '73. 46 OST for 3. Scoring Record: A tabulation of the different HOW TO SCORE stations worked showing weight data received UHF Lists: shall be submitted with claimed score and Points Sections shall be shown in LF scores. Lists (a) Each contact with another station ...... must be submitted on separate sheets repre (b) Each .. weight" figure transmitted and senting UHF and LF work. The same call may a.cknowledged ...... appear in the two lists, but not twice in the (c) Each "weight" figure received and re- eorded .... : ...... same list. 4. Equip~ent Limit: But a single receiver and Maximum points for a contact...... • :, transmitter equipment may be operated by a (d) Multiply sum of contact points by the number contestant station at one time, although of u.h.f. bands used. (ei Multiply result of (d) by two if station is oper operating frequency may be changed at will ated in field for all points scored. with the amateur bands. 5. Batteries must be used as a prime source of LF Lists: power without recourse to any public utility Score the same as above but substitute the num or gas-electric supply. Batteries may be dry ber of ARRL Sections worked in (d) for the number of n.h.f. bands used as a multiplier. or storage type cells, and genemotors, vibra packs, etc., may be used to modify voltages to set requirements. 2. Contest Exchanges: (A) The aim of test 6. Power Level: No transmitter with a power operations is to contact as many different level above 30 watts input to final may be amateur stations in the test period as possible, entered. and exchange information on the weight 2 of 7. Statement: The operator of each station re the battery-powered transmitters in use. On porting results for mention must submit a low-frequency the location of the ARRL Sec signed statement, "The points in my summary tion 3 shall also be exchanged. Each different are correct, and true, the power input to the station contacted counts one point toward the tranRmitter final was at all times below 30 score. Another point is credited for sending in watts, and both receiver and transmitter formation on the weight of one's own trans utilized battery-power throughout in accom mitter, if this is receipted for. Still another plishing the work reported on herewith . . . point may be credited for received informa (;;igned)." tion on the transmitter-weight of the station worked if this data is receipted for over the air and this weight reported in the record sent ARRL. Amateur stations not in the battery powered contest also may be worked for one Oklahoma State Convention point credit only, or for 2 points credit if you send data on weight to such a station and get (WEST GULF DIVISION) his OK or receipt. Operators not on battery Enid, Olrlahoma, October power obviously eannot give the weight of a '18th-19th battery-powered rig that they don't have! (B) UHF Scores shall be the sum of points T.H:E annual Oklahoma State Convention, made as above with a contestant's transmitter sponsored this year by the Enid Amateur Radio tuned to authorized amateur frequencies of 56 Club, is to be held Saturday and Sunday, October Mc. and higher multiplied by the number uf 18th and 19th, at the Youngblood Hotel in different u.h.f. amatenr bands on which at leaHt Enid. Saturday afternoon will be devoted to one contact was made. LF Scores shall be technical discussions and demonstrations, fol the sum of the points made as above with lowed by a Dutch lunch supper in the evening. a contestant's t,ransmitter tuned to author 8unday morning's program will include meetings ized amateur frequencies of 30 Mc. and below of the various traffic and operating groups, and 3 multiplied by the munber of ARRL Sections a code contest. The banquet will be at 2.00 P.M. on which at least one contact was made. In addi Sunday. Registration fee is $2.50. For further in tion to the above, the individual station points formation write Thomas II. Depew, W5GHN, in either UHF or LF lists take a separate 814 East Elm, Enid, Okla. multiplier of two, when you made the point operating afield (away from your home station location). )_;,.. Stravs :I\ ~ 2 For a transceiver or combined equipment, give weight of . . combination, all components included. Ordinarily the weight WlNGV puts waves in women's hair during of the transmitter unit, not including weight of battery or ~upply components will be given. the day and waves on the air at night. He's a 3 See complete list of ARRL Sections on page 4 of (JST. hairdresser. October 1941 47 Automatic Direction Finding The Principle of Aeronautical ABF Sgstems BY llA.LPB GIBBONS.* W7K'\T ..."" DEVICE called the radio compass was (in effect) to either side of the loop movement, introduced to air navigation in about 1932. This these contacts in turn to close the circuits of an was a true name for the device because it con electric motor that would rotate the loop. The posi sisted of a pointer which pointed at all times to tion of the loop could then be indicated on an azi the radio station tuned in on the system rather muth scale. Thus if the station is to the right or than to magnetic north. The principle of this left of the plane, when the signal is tuned in the q,evice, briefly, is as follows: If both a loop an loop will rotate until the meter is returned to zero, tenna and a vertical (non-directional) antenna and the position of the loop, as indicated on the are connected to a radio receiver through suitable azimuth indicator, gives the bearing of the radio coupling devices and phase-shifting networks, station from the plane. This device, as contrasted the resulting field pattern is a cardiod,1 as shown with the radio compass, is extremely useful to the in Fig. 1-A. If the connections of the loop (or transport pilot. By tuning in two stations t,he vertical antenna) are reversed, the resulting pilot can plot bearings and obtain a "fix," i.e., pattern will still be a cardiod but with the null calculate his position. If he is already on a radio rotated 180° (Fig. 1-B), i.e., the maximum signal course a single bearing will give this fix. will now come in along the line that previously A better picture of the workings of an ADF gave minimum response. The radio compass system can be obtained by referring to Fig. 2. consisted of a radio receiver to which was con Essentially it consists of a loop antenna, a loop nected a zero-center output meter and electronic amplifier and 90° phase shifter, an electronic ,;witching for simultaneously reversing the po switch (it looks something like a balanced modu larity of the meter and the polarity of the loop lator), a non-directional antenna, a sensitive and antenna. If the radio station were located directly selective receiver, a thyratron (grid-controlled ahead, reversing the loop connections would not rectifiers) azimuth control circuit and an audio increase or decrease the amount of receiver out oscillator. put and hence the needle would not deflect (Fig. The loop antenna is directional in that tJie l-C). If, however, the station were located to the voltage induced in the loop is maximum when right or left, the pickup would be greater with one the plane of the loop is turned towards the trans- loop connection than the other and the needle 1nitter and is zero when the plane of t.he loop is would deflect in the corresponding direction. This perpendicular to the line from the transmitter. device was not particularly useful to the pilot The resultant of the voltage induced in the loop because it didn't teJI him where he was but only is 00° out of phase with the voltage induced in whether he was headed towards the radio station. the ve.rtical antenna and changes abruptly 180° A strong cross-wind would make him fly a course as the loop is rotated through the position of zero considerably different than the direct route, and pickup. The voltage from the loop is amplified this is very undesirable from the standpoint of and shifted through 90° so that it is either in Fig. 1 - The pattern shown at A indicates the response obtained from ✓, ...... --- ... '..._ a loop antenna worked in conjunction with a non-directional antenna of II ' \ I \ equal pick-np (and a 90° phase shift). \. LOOP I B shows the pattern obtained when ~,,""'- : the loop connections are reversed. I I I I C is the composite pattern obtained I / by rapidly reversing the loop connec ' / '·, tions, and indicates how the system can be used to determine the sense of an off-conrse signal through the re fultant unequal pick-ups. A B C 48 QST for his bearing during periods of least static is of You probably know that aeroplanes .major importance, and automatic operation is use radio for determining their position limited to 40 or 50 miles. Any ADF system will and for keeping on course, but do you give erroneous readings in mountainous regions know how the systems operate? Here is where reflections or multiple reflections of the the explanation of the ingenious meth signal takes place, since the system senses the ods used, as given by a captain on the signal as coming from these points of reflection. Portland-Salt Lake Division of UA and a former A.R.R.L. director. However, the ADF idea has opened new fields in commercial aviation. A new dual automatic azimuth bearing indicator has been released which combines two ADF's that can be tuned to two into the electronic switch stage. The circuit of separate stations within its range. The azimuth this stage looks somewhat similar to a balanced hearings thus obtained are indicated on a single modulator stage, where two tubes are connected dial scale through the medium of red and green in push-pull with an additional coupling circuit needles concentrically projecting across the scale in the common grid return. The output of the face. In operation it is possible to tune in a sta loop amplifier is fed into this common grid tion ahead of the aircraft on one direction finder circuit and the output from an audio oscillator is and a station aft of the aircraft on the second fed to the grids in push-pull. The result is that, unit,"- with:the bearings indicated by the two depending upon the polarity of the voltage from the audio oscillator, one tube amplifies during part Vertkal of half of the audio cycle and the other tube am .4ntenna plifies during part of the other half of the audio cycle. The plates of the two tubes are connected in push-pull through a tuned circuit and, because LOOP AMPLIFIER of the switching action through the two tubes, ANO the phase of the current in this circuit will re 90" PHASE SHIFTER verse in accordance with the audio oscillator. From the electronic switch stage the loop signal is combined with the signal from the non ELECTRONIC RECEIVER directional antenna and amplified and de SWlrCH tected in a regular receiver circuit. The out put signal from the receiver is impressed in parallel on the grids of the two thyratron tubes used to control the loop motor. The AUDIO plates of the thyratrons are fed in push-pull OSCILLATOR by the audio oscillator and, depending upon which way the loop is turned, the phase relation Fig. 2 - Block diagram of an ADF system. determines which of the thyratrons will fire and thus which way the loop will turn. When the loop colored needles. Thus, in flying a straight route is broadside to the direction of the radio station, between two stations not served directly by radio the difference or resultant is zero and the motor range courses the plane's position is indicated by does not operate. The circuits are arranged so the two needles which, with the plane on course, that if the radio signal is coming from the left the will be separated by 180°. Should the craft modulation is such that the indicator points to the deviate from a straight line between the two left, and if the radio signal is from the right the stations to which the direction finders are tuned, pointer turns to the right. t,his fact is immediately and continuously shown The directional accuracy of the ADF system is by the tendency of the two needles to turn to e..'Wellent under normal conditions, but there are wards each other. several factors influencing its accuracy under ad verse conditions. Crash static has litt.le or no ~ Strays ~ :ts effect except to cause a spurt of a few degrees in . . one direction or the other during the crash or Muriatic acid commercial is effective in clean crashes. However, thermal or heat lightning, be ing copper-tubing coils. It should be applied ciause of its more continuous nature. offers a lightly with a piece of old linen or towelling. The greater problem. During intense conditions, when fumes are obnoxious, so don't inhale strongly. the discharge is almost continuous, the pointer While the acid is not dangerous to the skin, it will may tend to swing away from the station and attack clothing. Rinse in cold water. Out-of t.owards the direction of the center of the thermal door t,reatment is recommended.- W8DII. static agitation. Swings up to plus or min.us 90° have been observed. Under such cases, the ex W9LPQ is located in Sullivan, Ind., W9LPR perience and intelligence of the operator in taking in Sullivan, Ill. October 1941 cates now me system A56-Mc. Transmitter for Mobile Work Simple Construction of a .12-Watt .11 • .iU. Big BV BVRON GOODMAN,* \VIJPE AND DAL BUDD,** WIJTD The Circuit Although the design of a mobile After trying several experimental arrange 56-1\Ic•. transmitter must usually be ments, the line-up shown in Fig. 1 was selected tailored to meet the restrictions set by as a very practical one. A 6AG7 Tri-tet oscillator the type of automobile used, here is a transmitter that can be used in praeti using a 7-Mc. crystal - considered to be more • eaJly any ear that has a trunk rack. A ~ure-fire than a 14-Mc. crystal - quadruples in dash-board control system is also de its plate circuit to 28 Mc. to drive a 6AG7 doubler scribed, with suggestions for installing to 56 Mc. The 6AG7 is a high-gain pentode the power supply. · designed for television work, and it makes an excellent crystal oscillator or frequency multiplier for amateur work. The output of the doubler is THE design of a fixed-station transmitter used to drive a 6V6 amplifier on 56 Mc. A 6LG usually starts with the final stage and works was tried instead of the 6V6 but showed no im back through the exciter stages to the power sup provement in any way at the input the amplifier ply, but the design of a portable or mobile rig runs (12 watts). Provision for neutralizing the hin~s on the available power supply. Batteries 6V6 was included at first, but it was found un can be used for portable or mobile rigs, but their ne~essary in this particular parts arrangement. use is generally limited to the low-power class of It. 1s not to be assumed, however, that the 6V6 not more than one or two watts input. The next will work well at 56 Mc. without neutralization woup of available power supplies falls around the in every arrangement - the necessary neutraliz ~m- to 40-watt class and includes vibrator packs ing capacity is small and is doubtless present in and small motor-generators. Above that one this layout as a stray capacity. The grid of the jumps into a power class where the design is not tW6 is tapped down on the driver plate coil to dictated quite as much by the power supply as lighten the loading. by how much one can afford to pay. The modulation equipment consists of a 6C5 The transmitter to be described was designed driver stage and a 6N7 C!ass-B modulator. to work from a power supply delivering 125 ma. Anything except a single-button microphone at 325 volts. Working from a 300-volt supply would have required more audio gain and would brings up the current drain slightly above rating have introduced the possibility of more hash and is not recommended except in case of pick-up because of the lower level of the output emergency. This puts it in the class served by of the microphone. While single-button micro vibrator packs and small motor-generators that phones _do not give "broadcast quality," there are not expensive and can be operated from the can be httle or no complaint about their effective regular automobile battery without overload. ness and reliability, important factors in any Since maximum economy is desired in the exciter portable/mobile unit. and audio stages, high-gain doubler tubes and Construction Class-B audio for modulation were used. A mini mum excitation requirement dictates the use of a The transmitter i8 built on a 7- by 12- by 3-inch beam tube as the modulated amplifier. chassis, thus providing plenty of room for the * Assistant Technical Editor, QST. parts. Reference to the photographs will show """Chief Operator and Station Engineer, WlAW. the placement of parts, but some of the minor A complete 12-watt 56-Mc. 'phone transmitter. ready for installation in car or home. The tubes along the fron,t, from left to right, are 6AG7 Tri-tel oscillator, bA(,7 doubler and 6V6 final amplifier. The 6C5 driver <.left) and the 6N7 Class-B modulator are at the rear between the transformers. The knob on the right con trols the final tank condenser - the other tuning con densers are adjusted by screw driver through the rubber grommets. The meter switch is mounted on the front center, just under the meter pin jacks. Note that the antenna coil is mounted on the antenna hindin_g post strip - coupling is adjusted hy swinging the c01l. QST for A view under the chassis of the 56-Mc. transmitter shows the straightforward arrangement of parts. The coils L2 and La are self-supporting and are mounted on their respective condensers. Note the audio volume control and the power supply 11lug mounted at the rear of th(' chassis. The microphone lead from the plug to the microphone trans former is run through ~rounded shield braid. mrn~tructional points should he pointed out. The tuning eondensers (\, C2 and C'3 are mounted on the underside of the cha~sis on t,he small brackets that are furnished with them, and they are set far enough back from the front so that the ends of the shafts do not quite touch the metal. They are adjusted by a screw driver that rubber grommets in the holes. The final tank is prevented from shorting to the chassis by condenser, C'4, is supported on the panel. Fig. 1 - Wiring diagram of the 56-M.c. 'phone transmitter. C1 -·- 50-µµfd. variable (National Crn -25-µfd., 25-volt dcctrolytic. RFC·-- 2.5-mh. r.f. choke (National l 11\1 -!'iO). CN -- See text. R-lOOU). . ( :2, Ca-25-µµfd. variable (Na- R1, Rs - 0.2 megohms, I-watt. RFC1 - ll.h.f. r.f. choke (Ohmite tional UMA-25). lb, R4 - 40,000 ohms, 1-watt. Zl). c. - :l0-µµfd. per section variable Rs-···· 30,000 ohms, 1-watt. Sw1 -···· 2-circuit, 5-position rotary (Hammarlund H.F'D-30-X). R 5 000 hm 2 •witch, non-shorting (Mal- 6 0 6 Cs, Cs - 0.01-µfd., ,1()0.volt paper. - '·' ' • -watt. lory 3226J). C6, Co, C11 - 0.002-µfd. mica. R7 - O.l-megohm volume control. T1 Microphone transformer C7, C10 - 250-µµfd. mica. Rs - lO00 ohms, h-watt. (Stancor A-4726). C12, (;14 - 8-µfd., 450-volt elec- Ro - 6000 ohms, I-watt. Ti - Driver transformer (Stancor trolytic. H10-R1s - 25 ohms, Yi-watt. AA721 ). Ts- ·Modulation transformer (Stancor A-3845). %-inch diam., self-supporting. 6V6 grid tap l Lt - 19 turns No. 18 enam., spaced slightly to occupy turn from plate end. %-inch winding length, on ~,{-inch diam. form L4 -:l tu,r':1s No~}~, each. side center-spaced to occupy (National PRF-2). fa rnch, .vs-mch diam. L2 -··· 8 turns No. 14, spaced to occupy lJ/s inch, ½-inch Ls - 2 turns No. 14, %-inch diam. ,Jiam., sdf-supporting. P1 - -4-prong base-mounting plug (Amphenol RCP-4). La - 3.½ turns No. 14, spaced to occupy Ji inch, Lamp in series with crystal is 60-ma. dial light. October 1941 51 F'ig. 2 Circuit diagram of control box• .I - Small microphone jack (Mallory 702B). Sw1 - U.p.s.t. bigh-cnrrent toggle with sections in parallel. Sw2 - D.p.s.t. toggle. · P2 - 4-prong cable socket (Amphenol PF-4). f'3 - 6-prong cable plug (Amphenol ,Vicronh~ne RCP-6). Lea£stie!d f'4 -··· 6-prong socket (Amphenol PF- +o...1v. +Joo - 6). VIBRATOR PACK -6.JV.+ Battery is Burgess 3A2. Microphone lead is shielded throughout. All of the inductances are mounted on or near Tuning the Transmitter their respective tuning condensers except the final tank coil, L4, which is mounted above the The adjustment of the transmitter kl conven chassis on feed-through insulators. This makes it t,ional in every way and it should not be necessary more convenient to adjust the antenna coupling to repeat here how to tune a crvstal-controlled eoil, L5, after installing the transmitter in the car. transmitter. With 325 volts from ·the power sup The plate circuits and the final grid circuit can ply, the total plate and screen currents of thP. be metered by plugging in the meter leads to 6AG7 Tri-tet and the 6AG7 doubler will be 12 and the two pin jacks on the front center of the chassis 16 ma. respectively, and the final grid current and setting the meter switch to the proper posi should run about 2 ma. lf, when the voltage i.~ tfon. This is a convenience when tuning up with removed from the screen and plate of the 6V6 a different crystal or antenna. The power leads final, there is 110 flicker in the grid current as the are terminated at a four-prong plug mounted on final tank is tuned through resonance, there is no the back of the chassis. need to worry about neutralizing the final Control Circuit amplifier. However, if a flicker (of 0.1 ma. or soi does show up, the amplifier can be neutralized One problem in connection with mobile units is readily by running a stiff wire from the free end the drop in the line from the battery to the vibrator of the final tank over near the grid terminal on or motor-generator unit, and these leads must be the 6V6 socket to form a neutralizing condenser kept as short as possible. This transmitter is in (shown by dotted lines in Fig. 1). The stage is tended to be mounted in the trunk rack of the car, with the control box mounted on the dash then neutralized in the usual manner, varying board of the car and the vibrator pack mounted the neutralizing capacity by moving the free end under the hood on the fire wall. This is, of course, of the wire. Connecting the voltage to the screen for a car with the battery under the hood - for and plate of the 6V6 and tuning to resonance, the ears with the battery elsewhere the vibrator pack total plate and screen current should run under and control box might have to be mounted differ 35 ma. unloaded and about 39 or 40 ma. loaded. ently. There isn't too much drop in the leads run The 6C5 plate current will run around 8 ma., ning baP-k to the heaters of the tubes from the the no-signal 6N7 plate current around 35 ma., battery if heavy wire is used, and the drop in the kicking up to about 5.0 ma. on peaks. 300-volt line from the vibrator pack is negligible. The antenna can be anything from 0.25- to The wiring diagram of the control box is shown 0.6-wavelength long, depending upon what one in Fig. 2. As can be seen, the microphone battery has available and what the XYL's aesthetic sense is mounted in this box, and a jack is provided for will stand. Since the transmitter can be mounted the microphone. The switch Sw1 turns on the dose to t,he end of the antenna, there is no par vibrator pack and the heaters of the tubes, while ticular problem in feeding the antenna aside from switch Sw2 is used as an ''on-off" switch for the finding a suitable insulator to run through the transmitter, since it controls the microphone side of the car. lf something near a quarter-wave battery and the plate supply lead. The control length long is used for the antenna, one side of box is a small 4- by 4- by 2-inch box (Parmet the antenna coil, Ls, should be grounded to the MC-442) and takes up very little room. ear and a variable condenser connected in series An alternative system is to mount the vibrator with the antenna and the other side of L •. When pack and an additional storage battery in the t,he antenna is near a half-wavelength long, par trunk rack and to control both the "on-off" of allel tuning of Ls should be used. The center of L5 the heaters and vibrator pack and of the plate can be grounded or the whole thing can be left power through suitable relays controlled from the floating. Regardless of the length of antenna, the dash. However, the storage battery must be antenna coupling is varied by movement of L6 removed from the car for charging, a.nd thus the with respect to L4 after tuning both amplifier and installation may not be always "ready to go." tank circuit to resonance. 52 QST for ARMY-AMATEUR RADIO SYSTEM ACTIVITIES War Department. Office of the Chief Siit:nal Officer, Wnshinattou, D. C. REALLOCATION OF A.A.n.s. NET using the crude apparatus of that day. During FREQUENCIES the World War, Larry Dunn served as a 1st THE changes in the frequencies assigned Lieutenant in the Dental Corps. He resigned his to some AARS nets, necessitated by the tempo Regular Army commission in 1920 to return to rary allocation of 3650-3950 kc. to the Army, is private dentistry practice in Brooklyn. His inter progressing satisfactorily. It is expected that est in radio was revived upon his return to civilian much ,use will be made of the 1750- to 1900-kc. life and he again established an amateur radio band for new nets as well as for a number previ station and received the call 2CLA in 1921, which ously operating in 3500-3900 kc. A revised direc he has held continuously as W2CLA. Dr. Dunn t,ory of AARS nets and their assigned frequencies collaborated in the formation of the Army will be compiled in the near future. The realloca Amateur Radio System in 1926 when he was the tion of Army-Amateur net frequencies is being first director of the Hudson Division of the coordinated by the Liaison Officer, AARS, with American Radio Relay League. In 1929, when the Corps Area Signal Officers and with the ARRL original AARS affiliation plan between radio Communications Manager. amateurs and the Signal Corps was revised, Dr. Dunn was appointed Chief Radio Aide to the W2CLA APPOINTED CHIEF RADIO Chief Signal Officer of the Army by Major Gen MOE eral George S. Gibbs, then the CSO, and served THE Chief Signal Officer has appointed in that capacity until 1934 when the pressure Dr. Lawrence J. Dunn, W2CLA/WLMD of of his professional duties prevented his con Garden City, N. Y., the Chief Radio Aide of the tinuing. In 1920 he accepted a commission as a Army-Amateur Radio System. The appointment captain in the Dental Corps Reserve and in 1925 was effective July 26th for a one-year period. was transferred to t,he Signal Corps Reserve, Dr. Dunn's duties will include advising the Chief where he was assigned to the 302nd Signal Bat Signal Officer on matters affecting the status of talion. He was promoted to major in 1930. t,he radio amateur, liaison with Corps Area Radio Major Dunn later served as commanding officer Aides in furthering the interest of Army-Amateur of this reserve unit. In addition to his radio ama members and assisting the Liaison Officer, AARS teur experience he has also been an aviation en - Major David Talley in the OCSO - in the thusiast since 1928 and holds a commercial administration and operation of t,he Army pilot's license. He often files his own airplane. Amateur Radio System. In addition, Dr. Dunn In his professional work, Dr. Dunn is now con will maintain close contact with ARRL Head sulting oral surgeon of Kings County Hospital quarters. in Brooklyn and Mary Immaculate Hospital in Dr. Dunn's amateur radio experience dates Jamaica, N. Y. He is chairman of the military back to 1908 when he first became interested in affairs committee, Second District Dental Society, wireless. He received his first amateur station li a fellow in the American College of Dentists and cense from the Department of Commerce in 1913 a member of the Institute of Radio Engineers. and experimented in receiving and transmitting, ( Continued on page 86) Dr. Lawrence J. Dunn, W2CLA/WLMD, receiving from Major General J. 0. Mau borgne, the Chief Signal Officer, bis certificate of appointment as Chief Radio Aide. The specta tors are Major David Talley, Liaison OfficerofAARS; Alonzo 0. Bliss, W 4ES/WLRG, Fourth Corps Area Radio Aide; and George W. Bailey, WIKH, ARRL President. (Signal Corps photo.) October 1941 t:ONDUCTED BV E. P. TILTON.* WIDDQ ~losT of us in the east have spent a lot of this widespread gang with W2MPY /1, but by time envying the California W6's and their this time LZB had faded out up at Katahdin. At unique geographical situation which produces an 8:50, WlJFF heard W2MPY/1 report this fact, almost continuous temperature inversion along so Fred called him, reporting that he was S6-7. the ideally-curved coast of Southern California, W2MPY/1 replied that JFF was pounding in up as reflected in their seemingly unbreakable hold in Maine, thus setting another DX record- on the DX records for 112 and 22-1 Mc. The W6's Millinocket, Maine, to Newport, R. I., a distance have gone in for portable work on 2,!,i to a greater of 335 mi1es! W2MPY /1 also heard W2ADW, 400 extent than has been in evidence in any other sec miles, but unfortunately no contact was estab tion of the country until recently, and the abun lished. dance of high mountain tops which are accessible This was a perfect example of the "sunset in by car have resulted in many contacts beyond the version" which occurs so frequently along the 200-mile mark. shores of all large bodies of water in warm There is one spot in New England which is just weather. Coupled with this was a nice air-mass as favorable as to topography, but it remained for boundary extending along the North Atlantic a New York amateur to prove its virtues. On · states, the result of a large storm area advancing August 21st, Bill Gamache, W2MPY, of Mont from the Middle West. As is usually the case rose, N. Y., journeyed to the top of Mt. Katahdin, under such conditions, things went nearly dead 5267-foot elevation near Millinocket, Maine, and between 9 and 10 P.M., but came back strong with the aid of 20 watts to an HY-75, a 6-element around 10;30. Thereupon, the DX scramble, this array, and one of the best temperature inversions time between the Wl's and New York, New Jer in the history of work on 112 Mc., worked a string sey, and Pennsylvania stations, &-tarted anew. of stations that will give the California boys some New records for home-to-home DX were made real marks to shoot at! and broken as W2LXO, West Orange, W3HOH, Starting at 6:20 P.M., Bill contacted the follow Bernardsville, W2FJQ, South River, and ing Wl's in rapid succession: JWU, LMU, LFA, W2BYM, Lakehurst, N. J., and many Long Is ,JWB/1, NJL, LZB, MB!, HOH, LFI/1, and land W2's began to work up into Massachusetts; MWH, all over 250 miles/ At 8:35 contact was first to your conductor (very much agog) and established with WlBHL, Hopkinton, Mass., a then to WlBJE, Westport Harbor, Mass., distance of 295 miles. Around this time WlJFF, Wl.TFF, WIKOE, WlJWB/1, Mt. Wachusett, Newport, R. I., was in a "round-table" QSO with Mass., and WILZB at Boston. Here are a few of WlLZB, Boston, WINBU, Providence, W2ADW, the longest contacts: W2BYM-W1LZB, 240 East Quogue, L. I., W2LXQ, Fisher's Island, miles; W2FJQ-WILZB, 220 miles; W3HOH N. Y., WlKLJ, Bristol, Conn., and WlMRF, WIJWB/1, 200 miles. There were many more al Bridgeport, Conn. WlLZB attempted to hook up most equally phenomenal. Many of these were * :329 Central St., Springfield, Mass. repeated the following night, when conditions were almost equally good. Your conductor worked around thirty W2's, some of them run ning as low as six watts, yet covering the 100 to 160 miles with amazing signals! This condition prevailed, in varying degrees, for the better part of a week, with signals reaching tremendous strengths practically every night. In the early morning of August 2.5t,h, WlKOE, Wakefield, R. I., worked a W3 (call unknown to us) in Germantown, Pa., a distance of 230 miles. It is significant that, with the exception of the work of W2MPY/1, all this DX was worked from home l:ltations, most of them not exceptionally well situated as to altitude. In most cases the power input was under 100 watts. During the first part of the month of August plenty of skip-DX wal:! worked on Five, with WSCIR reporting some aurora work on August W9CCY, Council Bluffs, Iowa, nses a 4-element 26th. When skip ceased to appear the activity, as horizontal array for 112 Mc. always, took a big drop. It is unfortunate that 54 OST for this quiet period comes at the time of year when ings. W6OVK watches the aky for cirrus cloud formatioru,. inversion bending is at its very best. Five-meter Jim first noted the coincidence of cirrus and skip on Five last year, and during the 1941 season kept a complete log of enthusiasts would do well to keep their perspec cloud conditions from May 9th to August 3rd. During this tive, and realize that skip-DX, most t,hrilling period there were 26 clear days, and of these only 7 showed sport that it is, is merely a spicy sauce which adds any sign of band openings, and these openings were prin cipally to W7 (north). Heavy cirrus formations were noted flavor to the more solid fare of day-to-day effort on 14 days, and on only three of these days did the band in extending the locll.l horizons. Instead of drop fail to open! In 83 days of ohservation the band was open ping Five until next spring, now is the time to get 37 out of 57 days during which cirrus clouds were present about building up local activity. Arrange skeds in the Arizona sky. Has anyone else any weather-skip observations? with other enthusiasts within a 100-mile range. W6QAP reports that he had to aim his beam north to Get to work on those antennas and make them hear W7GBI while the latte,r was working W6SLO on July really perform. Line up the fellows in your part of 27th. SLO aimed his array northeast for maximum signal the country in a imre-fire relay circuit- and try strength at this time. At first the directivity of QAP's array was extremely sharp, but as W7GBI was fading out out this circuit regularly. Most important of all, he was audible with the array in any position. If this cultivate the habit of putting the rig actually on the air on a certain definite schedule - instead of merely listening across the band. Don't wait for activity -- make it! You'll be surprised to find how often it is possible to work out to 200 miles and more, when you're really trying! REBE AND THERE: IT rs probably news to very few, by now, that W3OR, Essington, Pa., worked a station signing K7GNN on the night of June 28th. This was one uf the summer"s l,p,st multiple-hop sessions; it was soon learned that K7GNN was the brother of W7FLQ, one of our most enthusiastic 56-Mc. W7's; a W9 heard a K6; yes, this one had all the makings of a new DX record for 'Vive. But now comes the sad story, straight from K7GNN: he hasn't been on Five since 1937, nor on any band since April 5th! Thus the story of the century becomes just a hoax, the "humor" of which all true amateurs fail to understand. We hope Alan finds out the culprit - we'll be glad to assist in a bit of tarring and feathering! Fellows in the Middle West may have wondered why all their messages addressed to East Coast stations never got Everyone who's ever worked DX on Five knows these through to their destinations in the U.H.F. Roundup of two. Vince and Robbie, W9ZJB and W4EDD, snapped August 9th and 10th. There were two very good reasons, at the Trenton, N. J., Hamfest by W2AMJ. both of them hamfests: the Delaware Valley affair at Tren ton, N. J., drawing u.h.f. enthusiast" from far and wide, proves anything, it is that one should not take anything for and the annual U.H.F. Hamhoree at Lake Quinsigamond, granted (especially the directivity of one's beam) in working Shrewsbury, Mass. Both gatherings were big successes - skip-DX. SLO and QAP are only about four miles apart. but they J~Jt awful holes in our relay routes! With the major period of •kip-DX over for the year, WlMEP/1 has added three more W9's to the list of work ·w6SLO is concentrating on some new gear, including a ers of Vermont on Five. CLH, Roselle; ARN, Bartonville eomplete f.m. receiver using the new 9000-series tubes. A and PK, Lyons, all of Illinois, were worked on July 29th. good example, Neo.l - why drop work on Five just because Chet wonders what was wrong with all the other W9 states, the band won't be open every other night for a while? Neal as five of his six W9's worked are in Illinois! It will be good expects to give f.m. a whirl on 112, 56, and 28 Mc. during news to 112-Mc. enthusiasts that Chet can now run his the coming winter. HY-114 as an oscillator on 2H. Vermont contacts on 2}1! W7FDJ says this states-worked business isn't fair to the coming up - watch the high end of the band! boys out west. Bill worked twelve this year, with Mich., W3HDJ, Delanco, N. J., lost his 50-foot t.ower early in (WSRKE, both vertical) ill., N. Me.'<., S. Dak., and Wyo. August and now has only a low horizontal for Five. Ernie being new ones. With states the size they are in the East, is putting the finishing touches on a mobile job to keep in W7FDJ would probably be up in the twenties, by now. touch with the band while away on business trips. Not too many of us have worked West Virginia, so new W5FSC, Huntsville, Texas, is finding the going rather stations there are doublv welcome. W8JKN is on in Buck tough these days. Bud missed a number of the better open hannon, with an 815 at 40 watts, and a 4-element "W6QLZ ings during the summer, and now he has nothing but igni Beam." W8ASI has gear under construction. Keep these tion to listen to. How about some help, in the form of skeds, boys in mind when turning those horizontal arrays, you from W5DNN at Austin and W5BHO, W5EEX, and others Ohio and Pennsylvania W8's! in Houston? Both these points should be workable from One evening recently, after the conclusion of a series of Huntsville. Let's keep those signals on the band all the year contacts with W9's (beam aimed west) your conductor was through! surprised to receive a call from WSPK, East Bloomfield, W5HYT, Amarillo, Texas, worked skip-DX on 25 days N. Y., about 250 miles to the west. This is the first time we between June 1st and July 28th, making 295 contacts in have heard a WS without the aid of skip, and it opens up all call areas and 22 states. John says that this work on Five interesting possibilities for a new relay route to the Middle has made 1941 the most enjoyable year in his 17 years of West. WlMEP/1 heard WSPK at this time also. If WSRTW amateur operation. Let's hope that, with W5WX, W5CHG and some of the other fellows in central and western New and others in that area active, enough interest will be York are interested, it would appear that some test schedules stirred up to keep activity on the band during the off season, are in order. Volunteers? t.oo. WSBPQ, Cincinnati, writes that he and W9RBK, Most of us have our pet" signs" for forecasting band open- Newport, Ky., have regular contacts with W8NSS at Odober 1941 Most everyone knows of the proficiency of W9CBJ with his camera - but there were 36 shots taken with his Leica U.H.F. MARATHON at a recent hamfest which will never appear in QST. You've Contact, Throuuh :.,tates guessed it: George forgot the film! August 16th In Uall {j(/ 111 2.t4 scor~ 1941 Late summer conditions have heen excellent for the boys WlAEP lll7 1008 2~J around Terre Haute, Ind. W9ZJIL reports that the stations WlAVV 112 :J4 847 18 up a.round Chicago, W9'a PK, 1OD, RRX, LLM, and YLV, WlBCT :,a 181 2 WlCGY -~2 396 13 come in almost like locals, as do W9QCY at l<'t. Wayne, and WlDJ 115 82 877 10 W9RBK, Newport, Ky. All these are 150 to 180 miles WlDLY 77 598 17 distant. WlEHT 57 413 6 WIEKT 111 779 16 W9EGQ, Gary, Ind., says that the new Twin-AX Cable WlHDQI 232 88 4 2376 29 now on the market bas an impedance of about 150 ohm,,, WlIJ 87 :J8 722 10 WlKLJ 196 79 1905 ~6 with a quarter-wave about three feet long - a likely sub WILFI 7 152 685 5 otitute for Q-bars in ¼-wave-spaced rotary arraya requiring WILLL 151 62 1613 21; flexible matching sections. WILMU 76 260 2 WlLSN 87 750 13 WIMBS 235 ()1)4 ll 112 MC. AND UP WIMEP/1 44 1 394 11 WINCQ 56 239 14 Y omt conductor has been spending a lot of time on 2 ½ of late. After two year• of intermittent work on this band we W2ADW I 102 6112 ,:') W2AMJ 181 1566 22 have finally managed to be on deck when thinp were really W2BYM 185 8 1,563 27 hot. We a.re still somewhat amazed at the strength with W2COT 105 18 556 6 which signals from 150 miles or more can pound in, even with W2DZA 279 4 1042 5 W2FJQ !57 62 526 13 very low power and the simplest sort of equipment. But W2LAL 94 6 550 9 we find the prospect not entirely pleasant, and we feel, with W2LXO 233 909 4 W2MGU llm 620 ;J many others, that the present condition of the 112-Mc. W2MIV -!8 90 418 9 band in the East does not reflect too much credit on the 95 :l74 2 institution of amateur radio. There are many fine signals, ~~Wifil' 4 16 I W2OEN• 86 370 2 both low• and high-powered, and some excellent pioneering work is being done on receivers and antennas for this band, W3AB8 54 208 5 W3ACC 95 4 599 15 hut there are too many of us who let anything which will W3AXC 29 6 135 6 make a noise on the air suffice for a rig, and anything which W3AXU 123 20 878 20 will pull in a signal or two do for a receiver. We would be the \ .7,.,1 21)6 1040 3 w 87 6 660 16 last in the world to advocate the abandonment of simple w 45 386 14 equipment for 2½, but there are a few simple precautions W3 58 277 11) W3HDJ 81 68() 16 we should all take to see that our equipment lo functioning W3HOH 98 230 1:190 13 properly. W3IIS 68 736 16 If you are using an oscillator, adjust it carefully. Watch W3RL 23 288 9 the grid current (how many owners of oscillator rigs ever W4FBH 67 706 17 check this most important factor?) and antenna loading. W4FKN 33 2 292 12 Run your tubes at reasonable operating voltages and check W6AJG 150 1620 25 for frequency drift. Be certain that you are getting upward WSDNN 40 4.58 13 W5FSC 40 416 16 modulation (see to it that your neon shows a good bright W5JGV 48 854 19 purple when modulating, not the orange color which lo apt to denote a tendency to go out of oscillation when the audio W6ANN 60 164 1471 14 W6BPT 9 121 5 is applied). Use only all much audio all is needed to produce W6OVK 8 1572 23 a good solid signal when the carrier is down to 8-4 or so at W6QG Ii 678 10 W6QKM 4 86 347 1 the other end. And in receiving, watch that plate voltage M 7 897 16 and keep it as low as pol!Sible, not only for reduction of ;gfil:'5 60 1282 17 radiation but for better operation as well. And all to the use WSUIR 107 10 1800 24 of transceivers - all right if used with care (all to operating W8KKD 96 38 1144 16 frequency Md receiver interference) by mobile stations, W8KWL 15 170 10 W8MHM 2 20 145 1 but there is harclly any excuse for their use in home stations, 57 645 16 particularly in thickly-populated areas. Let no not be con• ~~ifl\ 54 12 550 11 tent to be on 2½ merely because it is new, or simple, or WSTDJ 33 423 12 WSUUY 10 136 l cheap. Rather, let us develop this new territory in a manner in keeping with our usual standards. The Ultra-Highs can W9AB 25 194 7 W9ANH 39 550 11 be great fun - let's not spoil any part of this fun by hap• W9ARN 80 1007 21 hazard gear and thoughtless operating! W9BDL 79 1130 20 WlMDN has been working portable on Powwow Hill in W9EGQ 17 72 W9FH8 24 87 i Amesbury, Mass., with no unusual results until the evening W9LLM 79 :n 818 15 of July 21st. On this date he wall heard by James Lee of W9PK 102 1 920 24 W9PNV 96 543 2 Alexandria Bay, N. Y., nearly 300 miles distant. Lee also W9YKX 82 1084 24 heard another Boston WI and some WS's. WIMDN no W9ZHL 66 812 17 ticed an aurora display that night, and several DX contacts (Oontinued on paq• 9(/) =ri,~~1dX!Wiid~'i~ls\,?l: fa1n~ints. • Not eligible for award. • Formerly W9AOJ3/2. U.H.F. RECORDS Two-way Work Dayton, Ohio. Since the installation of 4-element arrays of 56 Mc., WIEYM-W6DNS, July 22nd, 1938 - the W6QLZ type at WSBPQ and W9RBK, and a 3-element 2500 miles. horuontal at WSNSS, these fpJlowi, now cover the whole 112 Mc., W2MPY /1-WIJFF, August 21, 1941 territory from WSCIR, Aliquippa, Pa., to Indianapolis and - 335 miles. Terre Haute. Looks like a sure-fire route through to St. 224 Mc.: W610J/6-W6LFN/6, August 18, 1940 Louis, at leaat, if W9'o ANH, BDL, ZHL, and others, can -135 miles. get the Ozark Net into action. How about some advance 400 Mc., W6l0J/6-W6LFN/6, January 28, 1941 effort to line up a continuous circuit for the Fall U.H.F. -20 mile•• Relay, which ia scheduled for November lat lllld 2nd,? 66 QST for The ARRL-Red Cross Preparedness Test BY ~I. A. HOSKEY.* Wl.llUY CosroNSORED with the American Red Cross, the ARRL preparedness te,st was an un AMERICAN RED CROSS questionable success. Held on April 4th-5th-6th, NATIONAL HEADQUARTERS t.his widespread testing of our communications Washington,. D. C. facilities, dedicated to perfecting the ability of Mr. George W. Bailey, President 1tmateur radio to serve the Red Cross at•any time, American Radio Relay League in the event of earthquake, hurricane, fire, flood West Hartford, Connecticut My dear Mr. Bailey: or defense emergency facing all or part of our I should like to express to you and to the eountry, convincingly demonstrated that we are m.emhers of your organization throughout the thoroughly capable of providing a vastly effective The Publisht·rs of QST assume no responsibility for statements made herein by correspondents. ON TUE FCC NOTICE they would sit there and let our bands slip away without a P. 0. Box: 550, Little Rock, Ark. struggle?" I was so worked up I was ready to drop m.v FJditor, QST: League membership and all ARRL activities. • • • The recent action of the FCC allocating certain frequen Then I had a chance to get a good solid copy of the broad cast. On top of that there came the RM Bulletin explaining cies in the amateur bands for the use of government services will, no doubt, cause some rumbling in the ranks but I think the temporary changes in full Lo and behold! I was a it, will be only selfish and short-sighted amateurs who will changed person instantly•••• 1 was ready to shout with object. joy and had only praise for the ARRL. I went back to work What part the ARRL representatives had in thls matt.er ing the nets with a punch. Gee! To thlnk that I was so little may not be kno-.,;n, but after studying the entire proposed as to pass judgment without knowing the facts. That all of plan I think it is the best thing that could have been done the time the changes to be made were only of a temporary ..• without undue oppression of any one group. After all, nature and only to help the defense program of our grand the United States is the only major country permitting ama• U.S.A.••• teur operation without unreasonable restriction. The gov No matter what happens, in times like these we should never pass judgment until we know the true and see ernment could have closed us all down and taken over all facts frequencies. the thing from all angles. Now, I think all amateur radio operator,, should be happy l also noticed that the purpose for which the new frequen o,ies will be used is a purpose that will naturally cease to and proud that we can g]ve parts of our frequencies to the exist at the termination of !,he present national emergency. defense of thls great country of ours. Let's make our motto: "The League of, by and for the That looks like a well-planned effort on somebody's part. radio amateur - the radio amateur of, by and for this grand Furthermore, it will padfy the hams who have been ~eream ing for years for a 40-meter 'phone band. Now they have a nld U.S.A. of ours." chance to see what they can do, but they shonld l;,eware of J<'acts before judgment, please. - 0. H. Baker, IVBVBQ where their harmonics falll Therefore, if any ARRL representatives had a hand in working out this arrangement, let's g]ve them bouquets now whlle they are alive, rather than wait until their names TUE ISOLATIONIST Al'KATEUR appear in Silent Keys .... Let's he l,hankful we do not 50 Albion St., Lawrence, Mass. have any more restrictions than we. now have. Editor, QST: ------T,e.,ter Harlow, W60VO Ladies and gentlemen, during the past few months this glorious country of ours has witnessed a marvelous exhibi t.ion of the real, non-flag-waving, Tin-Pan-Alley-less patriot ism of the American amateur radio operator. While thla ROCKFORD ILL. writer can lay no claim to statistical proof, a fair guess would EDITOR QST place the amateurs hlgh in the batting averages of those APPRECIATE ALL THAT ARRL IS DOING TO serving Uncle Sam in one form or another. But there is one MAKE IT POSSIBLE FOR AMATEURS TO CON peculiar individual whose viewpoint prompted this article. TINUE ACTIVITIES DURING PRESENT EMER I eall hlm the isolationist amateur. GENCY STOP AM PREPARING IMMEDIATELY This type of operator is either, (al entirely ignorant of the FOR NEW ALLOCATIONS STOP KEEP UP THE precious privilege of holding a ticket and the valiant, never UOODWORK endinl!: strugp;le of his legal representatives to perpetuate ,TAMES C MILLER W!lNTV ham radio, or, (b) he just doesn't give a continental darn for EDITOR'S NOTE. - •r-o the amateurs who have written anything or anybody but himself. pledging their support in this matter, our thanks. That the When you meet np with hlm. you will recognize him at umateur body is overwhelmingly loyal in its support of the ,.111ce. His economic circumstanrea will not give ;rou a clue. defense program is shown by the fact that over \lii% of t,he nor will his technical or operati11g ability. But his opinions, letters received P..xpressed approval of the temporar,v loan which he will gladly babble into your achlng eara for hours, of frequencies for the 11se of the Air Corps. should reveal his identity. His brilliant analysis of the day's 11ews would run something like this: "I see the government is trying to rope the hams in again. Well, they can count me out. I'm no sucker. I bet the League is crroking thls stuff FACTS BEFORE .JUDGHENT up. Sure, that bunch in Hartford is always fumbling the ball The League is nothing but a money-making racket, anyway. 1824 Barker, Lawrence, Kans. nuess I'll head for the shack and see what'• !\lore Amateurs Suspended. Since Oltr re just invites additional penalties! All amateur.~ can port on this painful subject in August QST, the . help most by continuing helpful advices to ARRL operating privileges of eighteen additional li and fi'CC reporting as fully as poswible on any and censed amateurs have been suspended by the all infraction.~ of Order '72 or other regulations so Federal Communications Commission. The sus that irresponsibility cannot pny and .~o anybody pensions of 60 days to a full year concern opera unl-icensed posing in our bands may be 7iroperly tors in states from one coast to the other. There is checked on. There has been ample warning in no magic location in which irresponsible opPrators bulletins and QST. All we can suggest is that all can feel safe from the Jong arm of the FCC amateurs make it a point to help keep amateur monitoring service. All good amateurs will be radio safe! glad to see this minority that endangers the UHF or LF? Either way, get your Battery reputation of the whole fraternity properly Powered Set in the Test, October 18th-19th. penalized for violating regulations and safeguards Mark the calendar now. Put the finishing touches set up for the normal course of operating or for on a new little rig (with handles) if you haven't the duration of the national emergency. already got that kind of amateur radio in your l<:leven of the operator suspensions were "be shack. Individual-clasR, lighter weight apparatus cause of communication with a station located will give surprising performance at reasonable in a foreign country in violation of Order No. cost. Don't let October go by without getting into 72." The other suspensions cover a variety of this fascinating field of amateur work! See full things that all amateurs should be careful about. details of scoring for the Battery-Powered ARRL One of the longer suspensions was "for transmit B}quipment Test elsewhere in this issue. ting unidentified signals and correspondence in The 12th ARRL Sweepstakes ... Novem violation of the Communications Act and the ber 8th-9th, 15th-16th. Here's an old friend in regulations of the Commission." This emphasizes the contest operating field coming up on the the need for careful observance by every amateur calendar again. It is not only the best chance of of the regulations that require the proper identifi the year to "WAS" but the "SS" means operat cation of ones •'wn call identity with that of the ing fun and results for everybody who tries his correspondent station both at the beginning and station in the activity. The "S" dates are tPnta termination of correspondence, and each ten tively set, for the above week ends. Look for full minutes during long transmissions. details along the usual lines in November QST. Other suspensions were for violation of Sec. W1A W Official-Information Schedule 12.136, in other words for not keeping a proper Changed. You will find elsewhere in these col log in accordance with the requirements of that umns a complete listing of the times when WlA \V section. There were suspensions for "wilful inter works on certain amateur frequency bands for ference with certain othP..r radio communications general contact with the operators on those while operating" and for transmission of "ob bands. The times of official broadcast transmis scene, indecent or profane language." sions with frequencies and word speeds are alRo The greatest safeguard to amateur radio given. The c.w. telegraph transmission of infor privileges is the vast, alert, responsible body of mation to all radio amateurs remains, as usual, radio amateurs that truly accepts its responsibili a simultaneous transmission on all frequency ties and opportunities in these times. Personal bands, by tape, starting at 8:30 P.M. and midnight rn~ponsibility in keeping a proper log of evP..ry EST. Instead of following this information by tran8mission, cooperation with the ARRL and voice transmissions in turn on different 'phone the FCC in quickly reporting every violation of band.~, the radiotelephone information will now regulations in detail, and care to observe at all be given at the specified time of opening the times every regulation and operating precaution period of operation for general work in each will be necessary to see us through. It, should not telephone sub band, and at one other time daily, be nc<'essary for the FCC to make continued as shown by the schedule. We hope all amateurs suspensions for Order No. 72 violations. However, like the change in policy. It will overcome our some of those eleven newly suspended for this former inability to fix the exact time for voice ean tell you that the FCC monitors have ways of OBS transmissions due to the varying length of ehecking completely through all subterfuges, so it the c.w. message~. Also we hope to step up our definitely doesn't pay to pretend work with batting average of stations. worked after the OBS non-existent W's or to Rign any false calls, as such transmission. There always have been some that 62 QST for did not understand that "(Jt:l\V •.. " meaut AllTlt;LE ()ONTEST that then and there we had to go to another The article by Mr. J. C. Nelson, WSFU, wit"' the CD frequency to live up to our published operating artide. cont.est, prize t,his month. w· c in vile f'nfrirs fnr thi.'J ,;chedule . . . so they ca.lied in vain. monthly contest. Regarding subject matter, we suggest. Netters ... Are You Set for 1750--1900- t.hat you tell about what activity you find most interesting in amateur radio. Here you will find an almost limitless kc. Work? The first list of new registrations in variety of subjects. Perhaps you would like to write on this frequency territory that FCC is clearing (of working for code proficiency, Emergency Corps planning, A-3) for state and section network operations as traffic work, workini( in Section Nets, 'Phone and Telegraph operating procedures, holding a League appointment, work of December 20th appears in this issue. A lot of ing on radio club nommittef'..s, orgrmizing or running a additions to our card file are expected to come to radio club, the most. interesting baud or t.ype of ham light just after the forms for this QST are closed. activity, ur some other subject near to your heart. Even though some of the long hop ARRL Trunk Each month we v.ill print the most interesting and valu able article received. Please mark your contribution ° for 1 Lines are coordinating their operations to share the CD contest." Prize winners may select a bound Hand.. time, the natural increase in use of 3500-3650 kc. book, QST Binder and League Emblem, six logs, eight pads by some networks and some ragchewers is going radiogram blanks, DX Map and three pads, or any other eombination of ARRL supplies of equivalent value. Try to make a 1.8-Mc. band frequency a "must" by your luck! the time the contemplated loan of ~{00 kc. of "80" is complete. So we urge that all ARRL Section netters (especially NCS) note the policies for Network Frequency Changing, set forth on "Some Do's and Don't's for page 62 of September QST, and take steps to get a 1.8-Mc. frequency registered on and ready for 'Phone Hams" use by December 20th or as soon as the frequency sector is dear of A-3. Don't wait until every other BY .-,. c;. NELSON. \'\TOFU* Section has registered on the preferred spots of 1. DO keep talkini(. Pauses may mean losing a QSO. "160." The highest efficiency clear-channel Sec Listening stations may tune over you during a pause in tion nets are likelv to be those out of the increas your traru,mission. Think of the power you waste and the extra QRM you cause! ingly QRM-filled ''80" regions. SCMs appointing 2. DO use push-to-talk. Lonp;: transmissions take too· some 160-R.Ms will start new networks of in m1wh time when in a roundtable (some five-station tables terested traffic pu~hers up there t,his coming ta.ke an hour to go around once). By tbe time all the stations have made long transmissions everybody is either about winter, and we are anxious to hear from all to fall off into slumber, or they have forgotten the things groups. that, want to move in from higher fre talked about. Also remember that in the midst of one of quencies be.fore t,hese get going. If we haven't got your long ·windbag sessions your contact may be called to a letter about your plans can we hear from you dinner or somewhere else. He won't be able to tell you, •u he must either wait for you t,o quit the chewing and pos to-day, please. ---- /l. E. H. sibly make his folks at home sore, or leave without explaining ttnd make you sore. 1 Careful planning of joint use of TL "L" frequency for 3 . .DO announce your call when testing. Of course, tP,,.c;ting most efficieni and continuous use has been completed by with your regular antenna for any length of time over a RM W6LLW, F:C W6RBQ (SF). SC.M W6MQ.M (LA), few seconds is lousy enough. But to keep whistling and ruid with the members of TLs I. at\d Fa network corumlida mumbling" l-2----3-4, hello test" for hours without identify t.ion is already fully decided upon and in use. Here's how ing yourself is awful! The rece.iving ham can't tPJl who ~·ou they are u•i..ug 361.5 kc.: TL L 5:30--6:30 P,M. PST: TL F are and doesu't know whether to take a chance un waiting 6:30-7:00 P.M. PST; CCN 7:00-7:30 P.M. PST; SFN 7:30- until you finish so he can call or to look for another station. :t0:00 P.M. PST; CCN after-IO! If you have a state 750 miles lf he knew who you were, he could make up his mind im long then time-sharing with a TL is not a bad idea, but O mediately. otherwise 160" will give better performance_ ... and 4. DO use a dummy antenna for testing. Rig up a double better insurance of freedom from interference. pole, doubleMthrow switch to .change over if you are too lazy to bother any other way. You wouldn't drive your car around the block for an hour or two at a time just to test it. The cop would arrest you for disorderly conduct. So don't put your rig on the ha.m bands for hours with your antenna Briefs ou, It interfere.CJ v--ith han1 operation and is unnecesHary. A New Members- O.!Jf.R.C. suitable dummy will load that rig just as well. 5. DON'T say "WE," "OURS," and "US" in your The Old Man Radio Club is composed of radio amateurs t,ransmissions when the rules of grammar specify the use of who are fifty years of age or older. See March, 1941 QST "I," "MINE," and "ME." The first person singular (page 61) for references t.o complete membership Jist. pronoun sounds better and doe..cm't grate on your listener'R WI.TIS sendi. us a list of new members, with ages indicat,ed: e.ars. W7CDS 64; W8VQX 59; \'V6PNM 58; W5WX 56; W8VAV 6. DO be careful not to repeat certain words over and 5:{; WlLTT 52; W9OQV 51; W3FM. W9FEW 50. The over in your conversation. I hear some _hams who work to roster now includ('.S 192 members. Any amateur who is death the words 'JUITE, THERE and others. After you fifty years or older is eligible for membership 111 the use a. certain word just so many times it gets very mo O.M.R.C. Send your date of birth to WIJIS, 46 Beals Court, notonous to your listeners. Rockland, Mass. 7. DON'T repeat sentences. If your signal is in the clear and you are being received with satisfactory strength it is Any amateurs who have extra earphones and would be totally unnecessary to repeat anything. Here_is a sample of willing to lend them to crippled persons in the United Sfates a. repeater, u I'm using 100 Watts here. I'm using 100 watts are kindly requested to send a card or radiogram to Joseph here." Now can yon figure out any valid reason for this dope Cabral, Jr .. WlMQT, 147 Jame.s St., New Bedford, Mass., ad vising of their desire to make such a loan. * 75 Minaville St., Amsterdam, N. Y. October 1941 63 to repeat that? He wastes f>Oo/o of available time and power for nothing and gets his listener impatient, Amateur Radio Provides Commu 8. DO use the ARRL word list for identification. Stand ardize this to make identification easy for all hams. 9. DO make an effort to obey that regulation about use of nications for Pougbkeepsie Regatta minimum power input for a given distance. When working Joe in the next block run your 300 watts down to 30 or au, CoM.PLETE radio coverage was provided to facilitate or detune your antenna, or stick a dummy antenna on. J·oe couducting the annual Intercollegiate Crew Regatta on the doesn't need your 300 watts over there. Hudson River at Poughkeepsie, N. Y., on June 25th, by members of the Mid-Hudson Amateur Radio Club of Poughkeepsie. The radio network included portable transmitting aud Trainee Traffic Stations receiving stations on the referee's yacht which followed the TABULATED below is a list of all the amateur stations crews down the race course, the judges' boat anchored at the .,_,·e know to be currently active at training schools camps, finish line, the observation train which paralleled the crews nantonments, etc. We can add to this list and keep it up tu on the West Shore Railroad along the river bank, at one of date only if amateurs in the services keep us posted on their the crew boathouses on the east shore of the river and at activities. Drop a line or send a radiogram to the Com the Poughkeepsie Yacht Club on the east shore of the river. munications Dept. giving your call, addre.ss, frequency and In addition to these complete stations, receiving equipment operator names. Please be sure to ad vise of any changes in was also operated at the Columbia Boathouse and the High location so that our information may be as accurate as land Railroad Station, both on the west shore of the river, possible. and at the Vassar Hospital grounds in Poughkeepsie, which in WlLOZ/4 (14,350 kcs.) - Camp Blanding, l>'la. overlook the race course. Public address systems were use at the latter two points to keep the public informed on Wl UE - l 1730-IDOO•KC:. NETWORK REGISTRA• TION DONOR ROLL The following ARRL Nets are the first to register their intention to work in the frequency territory 1750-1900 kc. in accordance with policies outlined by the Communications Manager in his Opera.ting News lead last month: 1776 kc. - Kentucky Section Net 1778.5 kc. - Michigan QMN Net 1780 kc. --· We,;,ern New York ORS Net 1804 kc. - Mission Trail Net (Calif.) · The Oakland Radio Club offers this attractive 1850 kc. - Southern New Jersey ORS Net A NEW National Catalogue for 1942 is just coming off the press, and as usual, a copy is yours for the asking. Among the new products, the most interesting perhaps is the 5-B-100 Tank Circuit which tunes through five amateur bands without plug-in coils. This was described in experimental form in Q/iT for November and December 1939. The 5-B-100 is similar in principle to the early version, but is vastly improved in details of construction. You may recall from the QST description that the basic unit of the 5-B-100 consists of a variable condenser ganged to a variable induc tance, the latter being somewhat similar to the variometers used in the pioneer days of radio. This combination covers a tuning range of four to one with nearly constant L/C ratio. Furthermore, a link output coil will provide nearly constant loading at all frequencies. To extend the range of the unit to cover five amateur bands (which requires a 16 to 1 rang~)~ a second tuned circuit is added. This is similar to the one described above, the principal difference being that it is designed for higher frequencies. Both tanks remain in circuit at all times, so that for any given setting of the dial, the 5-B-100 can resonate at either of two widely separated frequencies. Harmonic relationship between these two frequencies is absent in all amateur bands, and the mutual inductance of the coils is very low, so that in practice the 5-B-100 behaves very much like a single tuned circuit. In one respect it is much better than the conventional tuned circuit. Harmonics from the low frequency bands are suppressed without sacrifice of efficiency on the high frequency bands, because of the excellent L/C ratio at all frequencies. The convenience of the 5-B-100 is very marked. To operate at any desired frequency, it is merely necessary to supply excitation of that frequency and to turn the dial of the 5-B-100 until resonance is ob tained. Reneutralization is not required and frequency changes can be made .in a matter of seconds. 'I'he 5-B-100 is a complete tank circuit in itself, and includes the RF Choke as well as the tuned circuits. Although only 4" x 6" x 8", it is rated up to 150 watts input as a plate tank for RF Amplifiers. It is an ideal plate tank for such tubes as the 35T, 809, 811, 812, RK-11, RK-12, HK-24, etc. You will find the 5-B-100 described in the new National Catalogue, along with such other newcomers as the AO and AL Dials, and the new MS Condenser. Better get a copy at your dealer's. EUGENE SIMMS ADVERTISEMENT 67 BELIEVE ME •• THE WlAW Operating Schedule VIBRAPACI< GOES IN FIRST Effective September 25th EVERY TIME! OPEIIATING-VISITING Hmras: 2:00 P.M.-2:00 A.M. EST daily, except Saturday-Sunday Saturday and Sunday-7:00 P.M.-1:00 A.M. EST. Frequencies and Times OFFICAL BROADCAST SCHEDULE, sending addressed information to all radio amateur,. C.W.: 1761-3575-7150-14,254-28,510-58,968 kc. (aim ultaneously). Slarti11Q Time, (P.M .) Speed, (W.P.M.) EST CST MST PST M T lV Th F Sat Sun 8:30 7:30 6:30 5:30 20 15 25 15 20 20 Midnight 11:00 10:00 9:00 15 25 15 20 15 15 - 'Phone: 1905, 3952.0, 14,237, 28,510, 58,986 All voice transmission marked * under "general opera tion" starts off a period of general ham contact on the given frequency. The operator. when sending OBC on more than one band, listens for replies on the frequency indicated after transmissions at the times marked*· 'PHONE! Ti=EST Vf~E!Pu~So½:) 1906 kc. *6:30 P.M., 12:45 A.M. 3952 kc. "'9:15 P.M., 12:30 A.M. 14,237 kc. 2:30 P.M., *4:30 P.M. The Perfect 28,510 kc. *2:00 P.M., 6:00 P.M. 58,968 kc. 2:00 P.M., *6:00 P.llf., 9:15 P.M., Portable Power 12:30 A.llf. CoDJn PRACTICE: Besides the OBS times and word-speeds given above, WlAW will adhere to a schedule for sending Supply Wherever code practice transmissions at progressively increasing speeds (15 to 35 w.p.m. in 5 w.p.m. steps) daily except Fri Plate Voltage is needed day, starting at 9:45 P.M. EST. The Proficiency Certificate Award qualifying run•, after a 15-minute advance notice Might as well forget to go as forget to take at 9:45 P.M. EST, start at 10:00 P.M. EST, September 20th along your Vihrapack. It's tops for _portable and October 19th. Daytime runs for qualification, after preliminary call at 1:30 P.M. EST, start at 1:45 P.M. EST transmitters, receivers and P.A. :Systems. on September 7th and October 5th. No other power supply offers such a host GENERAL OPERATION: Besides specific schedules in differ• of desirable features. ent bands, WlA W devotes the following periods, except I. Dependability-Proved by thousands of police Saturdays and Sundays, to GENERAL work in the follow radio instal1ations where Vihrapacks operate on a ing bands: 2·1-bour-a-day schedule to give unfailing service. 2. Efficiency-";hich means noticeably less current Time EST FrequenC11 drain from the storage battery. 3. Compact-light in weight- Important where *2:()0 P.M.-2:30 P.M. 28,510-kc. 'phone 8pace 18 limited, or where Weight ia important as in 3:30 P.M.-4:00 P.llf. 7150-kc. c.w. airplane instaUa tions.. *4:30 P.M.-5:00 P.M. 14,237-kc. 'phone 4. Low first cost-A big investment is unnecessary >1<6:00 P.K.-6:30 P.llf. 58,968-kc. 'phone -you will eave by using a genuine MalloryVihrapack. "'6:30 P.M.-7:00 P.M. 1906-kc. 'phone 5. Low maintenance cost - less time required 7:30 P,M.-8:00 P.M. 14,254-ko. c.w. for servicing-The only part of a Vibrapack which "'9:15 P.M.--9:45 P.M. 3952-kc. 'phone normally ever wears and requires replacement is the 12:45 A,M.-1 :15 A.M. 1906/1760-kc. 'phone/c.w. long~llfe vibrator. It require& hut an instant to install 1:15 A.M.-2:00 A.M. 3575-kc. c. w. a new vibrator- compare this with the elaborate overhaul required by other forms of power conver~ sion equipment. 6:45 P.M.-7:30 P.M.: Schedules on 3500-kc. band. 9:45 P.M.-11:00 P.M,: Code Practice, all c.w. freqs. Ask your distributor for technical data on 11:00 P.M.-Midnight: National Trunk Line Net, NCS. Vihrapacks, or write for Form E-555C. At other times, and on Saturdays and Sundays, operation Is devoted to the most profitable use of bands for general P. R. MALLORY & CO., Inc. contacts and to participation in special week•end operating INDIANAPOLIS INDIANA activiti"6. The station is not operated on legal national Cable Address-PELMALLO holiday•• r-· · Use I MALLORY imm APPROVED i!liiii PRECISION PRODUCTS 68 "SUPER PRO" receivers occupy important positions in our national defense program. Engineers in both mili Complete technical Information on the "Super Pro" Is available for the askins. tary and naval services have found that the "Super Pro" is Write Dept. Q-10 for 16 page booklet containing diasrams, curves and other able to do the most difficult jops. That's l;,ecause the "Super lnterestl,ns technical information. Pro" is not an experiment. It has been tried, proved ~nd improved over a number of years, making it outstanding in ···- every detail. • THE HAMMARLUND MFG. COMPANY, INC• 69 Pruent Term /ile,tion Closing D1te PresentSCM q(Offi.o, End, San Joaquin Oct. 1, 1941 .E:d win A. Andress ...... Valley (resigned) Philippines Oct. 1, 19!1. George L. Rickard Oct. 15, 1938 Kentucky Oct. 1, 1941 Darrell A. Downard April 15, 1940 WesternFlorid" Oct. 1, 1941 Oscar Cederstrom April 15, 1941 New Mexico Oct. 1, 1941 Dr. Hilton W. April 15, 1941 Gillett So. Texas Oct. 1, 19!1 Lee Hughes June 15, 19H &cramento Oct. 1, 1941 Vincent N. Feld- ,June 15, 1941 Valley hausen Hawaii Oct. 1, 1941 Francis T. Blatt Feb. 28, 1941 Md.-Del.-O. C. Oct. 1. 1941 Hermann E. Hobbs Sept, 17, 1941 Eastern Florida Oct. I, 1941 Carl G. Schaal Oct. 15, 19!1 Missouri Oct. 1, 1941 Letha Allendorf Oct. 19, 1941 Nevada Oct. 15, 1941 Edward W. Heim Nov. I, 1941 Oklahoma Oct. 15, 1941 .R. W. Battern Nov. I, 1941 Eastern New Oct. 15, 1941 Robert E. Haight Nov. 1, 1941 York Nov. 3, 1941 W. D. Tabler Nov.21, 19H he safety margin in Thordarson ;:te'::.i::: Nov. 17, 1941 Fred Chichester Dec. 6, 19H York transformers gives longer life, free Connecticut Dee. l, 1941 FrederickElls,Jr. Dee. 13, 1941 dom from chatter and quiet efficient WIBConsin Dec. 1, 1941 Aldrich C. Krones Dec. 18, 1941 Southern Texas Dee. 15, 1941 Horace E. Biddy Dee. 23, 1941 performance, even under adverse Louisiana Dec. 15, 1941 W.J. Wilkinson,Jr. Jan. 2, 1942 operating conditions. It is traditional I. You are hereby notll!ed that an election tor an A.R.R.L. for radio amateurs to use Thordarson ~l";~e ~"':.'?,~tWt~a!~'i'."if/:i'= ~%~~e'lfe~\1~~-fu 08~c~cf- transformers - they know that pre ance with the provisions o! the By-Laws, 2. The elections will take place In the dlf!erent Sections Im• cision methods backed by 46 years mediately after the closing date for receipt o! nominating peti tions as given opposite the dltlerent Sections. The Ballots malled of experience will deliver the ul !rom Headquartera will list In alphabetical sequence the names or all eligible Cllllcildatee nominated for the position by A.R.R.L. timate in service with any Thordar members residing In tbe Sections concerned. Ballots will be me.lied to members as of the closing dates specll!ed above, !or son transformer they select. receipt of nominating petitions. :i. Nominating petitions from the Sections named are bereby solicited. Five or .more A.R.R~L. members resldlna' in any Sec- ~0~l:,~T3;e,etg~i;~n~ifJ~~!t'¥hf/offt,';,,~g;,;;'r~~~ nation Is suggested: (Place and date) Communications Manager, A.R.R.L. 88 La Salle Road, West Hart!ord, Conn. We, the undersigned members o! the A.R.R.L. residing In the ....•••••... Sectlono!the ...... •.•.•.•..•. Division hereby nominate ...... as candidate for Section Commun!eatlons Manaa:er tor this Section tor the next two-year term of office. (Five or more signatures of A.R.R.L. members are reqlllred.) The cancildates and nve or more signers must be League mem bers In iiood standing or the petition will be thrown out as In• valld. Each candidate must have been a '1<:en.sed amateur operator for at kast two vear1 and dmtlarlv, a member of tM League for at least one contmuom vear, tmmedtalelv pr0r to his nomlnatwn or the pelUlon wtU ltkewlse be tnva!fdatea. The complete name, ad• dress, and station call of the candidate should be Included. AU sueh petitions must be tiled at the headquarters office of the League In West Hartford, Conn., by noon of the cloelng date fJ:.i!~'J~:i&ig.;.nr~n:,t,,~b~eJl~~-"Cu'f~g<:;,~g/)~~·:l~ more than one. pefftl~m~~h~~= ~1 ~t t;n'.;:,vg,,\~:g),"J:~+:f.11)! your opportunity to put the man ot your choice In office to carry on the IV BILL GUIMONT was the outstanding op- much less tiresome and gave him an opportunity erator in the recent 160 meter W.A.S. to demonstrate the skill with which amateurs party. The new record he established is just operate their stations. Congratulations Bill, yot.i' another example of the real value of amateur did a fine job. radio. Bill was operating just for fun but it shows what can be expected of an efficient MAIL COUPON FOR BOOKLET! ham station during an emergency. Bill, W9JID, ------HAMMARLUND MFG. CO., INC. 0-10 reports his HO-120-X contributed in no small 424 W. 33 Street, New York City way to his setting a new record. Its ease of Please send "HO" booklet. operation made the long hours at the controls Name.,, ...... Address ...... ' . . . . HAmmARLUnD EXPORT ADDRESS: 100 VARICK ST., NEW YORK CITY 71 WJAW SENDING-PRACTICE SUB• JECl'S AND QUALIFYING RUNS Dnllr,-except-l<'ridau W.IA ff' l.'odc Practice Starts at 9:4,'i P ..tl. l!.S. T. The subjects given below will he fol lowed each Sunday, Tuesday, and Thursday, September 21st to Novem ber .1st, and the text is identified to make sending practice available. To get sending help hook up your own key and buzzer or audio oscillator, turn to the QST material, tune in W1AW, and attempt to send right in step with the tape signals. Adjust your spacing in the manner the received signal indicates necessary for im provement. Dal• Subject of Practice Te,:t from September QST *Sept. 21. U. S. A. Calling, Nav11 Commi,sion, for Electronic• Specialists, p. 36. *Sept. 23. A Simple Filter for Elimination of B.C.I., p.47. *Sept. 25. Bianol Corps Radio School, p. 9. *Sept. 8. Here and There, p. 43. OMETIMES we find it_ difficult warding off a *Sept. 30. The Radiolocator, p. 7. tendency to accept an "ostrich logic" ••. Oct. 2. 0-urCoruributiontoNationalDefense,p. 7. S Oct. 5. 1 :tJO P.M. E.S.T. W1 AW daulight-q-ualif11· to bury our head in the sand • • • to close our ing run. Unannounced Cop11. Oct. 7. Election Notice, on Renewing License•, eyes to realities. But questions persist in our pp. 30-31. Adapting the 6L6, etc., p. 58. minds, even as they must in yours. Oct. 9. Radio at the Moiel Airplane Meet, p. 15, Oct. 12. Miniature Tube• in a UHF Converter, p.18. • Will the emergency have Oct. 14. Five Meter Wave Paths, p. 23. Oct. 16. Ham Haven, p, 28. The C.8.0. 8a11• passed? p. 29. • WIii raw materials be more Oct. 19. Evening Qualif11ing Run, 9:46 P.M, E.S.T. Unannounced Cop11. plentiful? Oct. 21. Handle Yo-uT TTa;//ic on 160, p. 11. Oct. 23. A Band-Edge Spotting Oscillator, p. 32. e WIii productive capacity be Oct. 26. The Secret• olGood Sending, p. 35. ample to fill commercial re Ort. 28. Antenna• for Domestic Work, p. 38. Oct. 30. In the Service•, pp. 44-45. quirements? * August 1941 QST. e Will radio amateurs be oper ating under "normal" con ditions? O.R.S./0.P.S. Activities These questions we cannot answer with any L you have a good 'phone, why not drop a line to your SOM (addreos in each QST) for application blanks for optimistic assurances. OPS appointment? .ARRL Headquarters will also be glad to send information regarding OPS work to any amateur Today, in spite of the intense pressure of who inquires, including sample copies of b1dletin material lll! long a.s extra copies last. Every high quality 'phone sta defense requirements which must receive prece t-ion which is operated in line with correct practices should. dence, we are making every effort to maintain be included in the Official 'Phone Station roster. The Official Relay Station appointment is primarily a our line of CARDWELL CONDENSERS for ama traffic appointment, for amateurs interested in regular traffic teur and commercial applications. work, schedules, etc. Opportunity is given all ORS ap pointees to test station performance during quarterly QSO parties. The pleasure derived from these get-togethers can Whether it be tomorrow, next year or in the more be fully appreciated only by participation. If sincerely in- - - terested in traffic handling, take steps now to obtain ORS distant future ••• better-than-ever CARDWELLS appointment! Drop a line to ARRL Headquarters or direct will be available to you. to your SOM for complete details on how to become ORS. Act now and get ready for the big fall/winter season. Apparently the winning score of WITS in the previous party was too much for the E. Pa. lads. They came back in the July Party with a vengeance this time, W3DGM taking THE ALLEN D. CARDWELL top position and W3BES sliding into second place. WI TS placed third after running a close race with Jerry. The fourth JIAIIUFACTURJIIG CORPORAT/011. total over ten million was made by W3SN, a new call in the • BROOKI.YN NEW YORK "high ten" who appears intent on pushing right up into the honor positions. 72 "No it ain't a rainmaker-Hank has to watercool his antenna since he put in his new GL•810's" ANK'S OM merely means that with GL-810's you put plenty of soup in your antenna. The skywire will fairly sing withH your signal. GL-810's are used as the· final amplifiers in the G-E 250-watt frequency-modulation broadcast transmitter because of their low cost, and high efficiency and stability at high frequencies. GL-810's are easy to drive, easy to neutralize, excellent for a-f or r-f service. Look 'em over at your dealer's or write for complete dope (just ask for Bulletin GET-755A). GL-810 TRANSMITTING TRIODE ••• Net $13.50 Clan I Audlo-2 tubes Ample output to plate-modulate a 1-kw rig; driv r ing power, 13 watts. I FREE! Class C 'Phone-Plate Modulated* I DATA BOOK ON RECEIVING TUBES Input, per pair ...... 900 watts I Driving power, per pair...... 34 watts I D It's different: 24 pgs .. 8½ x 11. Includes tube di- mensions, base connection diagrams, and interchange Class C Telegraph* I ability chart. It lies Hat; the type is easy to read; technical Input, per pair-1000 watts, conservatively oper I information is in easy-to-get tabular form. ated; driving power, 24 watts. I Also *Intermittent _Commercial and Amateur Service I D GEA-3315B on G-E Transmitting Tubes O GEA-20218 on G-E Pyranol Capacitors I General Electric, Section 161-27, I Schenectady, N. Y. Please send me free the items checked. OE~ERAL ® E~ECTRIC !I ~=--Name..·-···-·········--········--··········-········-·········------··-·- ______,,.,._ ------ForB In the OPS shindig W4DCQ led for the fifth consecutive Crystal time! Second honors go to W9BOF, who followed not too far behind DCQ, and WlEAO stepped into third place. Nice going, OM's, The next ORS/OPS Parties will be held October 25th- 26th. It promIBes to he a. busy week-end, judging by the a.mount of activity already evident this season. See you there! Official Relay Station Scores (July) .. ., ... I -~ ~ ·.:i :ii tf1 ~ ~J ~~ ! i,,-...,,.!:; u W3DGM"" 12,850,180 215 43 200 17h. W3BES 11,855,139 203 46 6 300 18 h. 47 m. WITS 11,792,130 196 45 400 14 h. 5 m. W3SN 10,973,595 155 46 10 250 19 h. W4DWB 8,681,040 170 46 10 180 15 h. 50 m. W§BRD 8,643,456 171 45 16 70 17 h. 35 m. W9DIR 8,418,480 168 42 18 15 h. 27 m. W2LZR 7,517,580 169 41 8 16h.20m. W9MUX 6,363,588 152 42 7 100 19 b. W6RUE 5,739,033 108 41 8 225 19h.37m. "' .. ~ ·.:i j .:: ·.:! s ! ~! ~~ ~ ~! ~~ WSROX"" 5,148,294 148 88 W3DRD"" 2,065,610 99 35 WSSFV 4,676,400 141 39 W!BIB 2,064,816 110 34 W3JBC 4,502,105 137 35 W8OKC 2,060,920 105 29 W3HXA 4,116,535 134 39 W8MLM 2,028,250 103 30 W!TD 4,107,600 129 39 W5DBR 1,815,970 89 33 WlKQY 4,049,925 124 41 W7HTH 1,652,614 63 31 W9Nfil? 3,979,205 118 43 W6BAM 1,412,472 64 28 W6B 3,408,330 88 35 W8KXP 1,318,866 87 27 a,ass,245 122 39 WlNDB 1,279,375 84 31 w=W 3,386,730 122 36 W2KYV 1,163,280 80 31 W9INU 3,327,695 122 33 W2LPJ 1,144,151 84 23 W5IKD 3,054,480 101 42 W5IVG 1,109,600 75 34 W3EML 2,950,605 121 32 W6RFF 1,091,367 57 26 W9GHD 2,811,168 105 39 W8R,YP 1,068,870 84 26 W9GBJ 2,637,318 100 38 WSUFH 1,032,600 71 29 WSRKM 2,081,480 104 32 Official 'Phone Station Scores (July) .:ir .§ .... t! --:g0 ;ta ii'S l i J I>,~ ~ W4DCQ 6,384 48 24 13 900 5 h.17 m. W9Bm' 5,700 37 20 soo 4b.23m. WIEAO 4,471 31 • 17 8 250 5h. 7m. WIGKJ 4,214 25 14 l3 115 5 b. WSQFN 4,095 31 15 9 300 1 b. 41 m. .. ] i --,::, i ! i l ~ 00 ~ to WlFBJi 4,004 25 13 WlKTE 2,040 18 10 W!LBH 3,9&0 23 14 W3AIJ 2,040 22 12 W!LNI 8,575 23 13 W2MIG 2,000 16 10 WlDWP 3,393 21 13 W2JZX 1,892 14 11 W2IYX 2,754 28 17 W2DOG 1,647 15 9 13 W3~ 2,585 15 11 1,580 2-0 W6 2,348 11 9 w~W8S 1,376 10 8 0 10 WSKBJ •• 2,060 28 14 WSKNF 1,050 17 In the Services (Continued from plJQt 60) Becker, 9EJY; Kupm, 9IKH, and. Heib, 9RRT. National Guardsmen also enrolled in the course were Tech. Sgts. Vietsch, HEB; Kum, 3HRZ; Staff Sgt. Ehr, 7HOQ; Sgts. Sweeny, 9CZB; Blessin, 9TCF; Uthus, 9IXC; Pfco,. Ab bott, IKCO; Scruton, lLPA; Schenck, 7GDS, a.nd Brooks, STSN. Hams of the Merrimack Valley Amateur Radio Associa tion of Concord, N. H., are well represented in tbe services to-day. Lt. Smith, lLBD, a.nd Lt. (jg) Evans, IBFT, a.re a.t Navy headquarters in Boston, RM2C Norris, ILIN, and RMlC Chandler, lAWU, are at the d/f station in Winter Harbor, Maine. RMlC May, !JCA, a.nd RM2C Corson, lMZV, are with the Atlantic fleet, while Ensign Robinson, lJBA, and RM3C Noyes, IMIP, are in the Pacific. Pvts. Wood, ILVG, and Mills, !KMC, according to lBFT did not run true to form, a.s they enljgted in the Army; both are in the Signal Corps. E ,A'/lE HANY REi4SONs ~ . ALS1MAG INSULATION You GAIN in many ways when you specify ALSIMAG insulation. In the first place, by using ALSIMAG the manufacturer has the choice of many steatite ceramic compositions, each having definitely determined physical characteristics. Thus AtSIMAo is "nght" for the application. Next, ALSIMAG insulation is almost always custom , made in the size, shape and form required for the application. A perfectly adapted custom-made insulation requires the least possible amount of space, lowers the cost of assembly and frequently eliminates much e."{tra material that would be required to mount and house a larger than necessary insulator. Thus the demand for higher efficiency with compactness is ably met by AtS!MAG. A new Property Chart giving the exact phys, ical characteristics of the more frequently used AtSIMAG compositions will be sent you on request. This advertisement is one of a series deslgned to give you a better under, standing of the advantages of AISiMag these applications of AISiMag 196 1n insulation It is not a, solicitation of he most important physical characteristi,;s business Custom made AlSiMag is re absolute and permanent rigidity, ex• sold direct to the manufacturers. eptionally high dielectric and mechanical trength and unusually low ~ielectric loss under all working conditions. CHATTANOOGA • TENNESSEE HICAGO • CLEVELAND • NEW YORK • ST, LOUIS • LOS ANGELES • SAN FRANCISCO • BOSTON • PHILADELPHIA• WASHINGTON, D. C c.-rrespondence (Continued from page 61) will enable you to decide whether the League is worth your solid support. If you do, you should soon join the ranks of thousands who say:" The League? It's a good thing we have it. It isn't perfect; nothing is. But it's the only representative organization we have in a world filled with uniorui and socie ties. Let's stick together - especially now!" - William A. Beatty, WtNFN Headquarters Battery, 2nd Bn., 208th C.A. (AA), Camp Edwards, Falmouth, Mass. Editor, QS7': The Correspondence section of your July issue carried some letters concerning radio operators in the army being made to bugle and other non-radio details. The Editor's Note stated that it was practically an impossibility for men to obtain transfers due to expense and the difficult procesees involved. I disagree with this entirely. Several of our men have obtained transfers to other branches. The work in volved is but a small amount of paper work and the permis sion of the battery commander which is easily obtained if he is sure the man is bettering himself. It seemll too_ bad to dis courage soldiers the way this Editor's Note probably has. If you are really working for the amateur's interest in re gard to their work in the army, I would really look into this \ \- / 7 matter further. -Statf Sgt. Joatph B. DooliUl•, W1CTC solves any Ohm's law problem \ \ / / // EntTOR'e''NO'l'E. - We are glad to know that it is possible with'. one setting'/ of the shde. for enlisted men in the Coast Artillery easily to obtain trans fers to other branches. For those not so fortunate, if any licensed amateur in the service has duties which do not Per· ts.in to radio, and desires radio work, he can write tho Ed itor, stating his full name, homo address, raµk, serial num Amazingly Simple and Easy ... ber, outfit, location, present duties and a brief outline of bis training and experience. We may be able to help. You'll use it every day Amateurs, Students, Engineers •.• they're CODE PROFICIENCY all enthusiastic about this remarkable Cal culator. It gives you the answer to any 1246 Piedmont Ave., N. E., Atlanta, Ga. Editor, QST: Ohm's Law problem in a jiffy. There's Thanks to ARRL for the ticket I iust received, because nothing else like it - and we're making without the WlAW nightly code practice I would have been it easy for you to get one. at a total loss. Permit me to expresl! my sincere appreciation for the help you have given me and that which you are giving prospec tive hams, - Bessis "Jerris" Cunninuham, W4HWS AIJ Values are Direct· Reading ... Requires No Slide Rule Knowledge 36 Waldemar Ave., Winthrop, Mas.. Editor, QST: Scales on 2 sides cover the range of cur • • • Let me add my compliments to the League for this rents, resistances, wattages and voltages fine activity. I believe it has and will do a great deal to in• commonly used in radio and commercial crease the efficiency and value of the average ham in case work. A setting of the slide also tells the his services should be needed to help defend our country. stock number of the resistor or rheostat you -.Linwood M. Patt••• WtLMO may need. Size only 41/a" X 9". 315 West Third St., Junction City, Kans. Get it today - at your Editor, QST: ______Jobber or Use this Coupon,__ __ About a year ago when I first read the aetails concerning your daily code practice transmissions, I decided to copy them every night as I could see that they were very valuable. OHMITI MANUFACTURING CO. It wa., only reasonable that anything so valuable could not 4863 Flournoy St., Chicago, U.S. A. be passed out free of charge for very long, and it was my lOc in coin enclosed opinion that they were only to be sent for about a month. Send Ohm's Law Calculator As a direct result of improving my speed I was able to get a much better job than I had, and later as my code speed in• Name ...... , ...... creased further I was enabled to get a raise in pay. • • . - Herbert 1;. Holme• For highest efficien Address ...... cy, use OHMITE /1.esist,111ce Unit; in City, ...... ,. Stat...... your ris. QS'f-Oct. '41 ~ Strays :I) . ~ . Friday, the 13th of June was my lucky day. I l?e / Write for Free Catalog Today! MT. CARMEL ILLINOIS "PRECISION-BUILT 77 &: Strays :I) . ~ . The Scott Stamp and Coin Co., 1 W. 47th St., New York puts out a small book called, "Scott Gummed Names of Countries." It con tains 832 gummed labels, about 2,!,~ by ,1 inches, each bearing the name of one of every stamp issuing country in the world. Several duplicates of the more-common countries are included. These books, which cost 50 cents are just the thing for labelling DX-card albums. ·-- W2IOP. YI.BL, t}RV ! (Continued from page 87) AARS and YLRL nets soon increased her oper ating speed. Then, while visiting in Minot, N. D., she learned that a friend at b.c. station KLPM was leaving for defense work. Would she take his place until they could secure a perma.nent op? Would shef At first she thought THE AMATEUR'S CHOICE she had taken on more than she could handle, IN THE LOW POWER FIELD but she was determined to succeed. A speed of 37 to 40 w.p.m. for a half hour at a stretch wasn't exactly hamming when one had to be letter STANCO R'S perfect. She learned, too, that the tape punchers didn't repeat even the hardest names, but she stuck with it for three weeks and gained invalu IOP TRANSMITTER able experience. There are many reasons why amateurs everywhere are Jean Hudson, W3BAK, a favorite Candler choosing 1 OP transmitters. pupil and daughter of an ex-SOM, gained inter OPERATING ECONOMY. The lOP operates on national attention at the age of 9 when she won any standard l os...:1 25 volt 60 cycle line and consumes a world's championship copying code at the but 75 watts of current. Standard plugain coifs are used to minimize cost of placing transmitter on different bands. Chicago World's Fair. She's no slouch now, Low tube replacement cost is obtained because inexpen• either, ru;id at the Asheville Code Tournament sive receiving type tubes are used throughout. not long ago she "copped" the Class B cham OUTSTANDING PERFORMANCE. Many letters pionship, making perfect copy on the mill at received at the factory testify to many transmissions far 52 w.p.m. with apparent ease. beyond the customer's expectations. The YL's are particularly proud of Dorothy VERSATILITY. Operates on 10-160 meter bands. Willett, WSUDA. The remarkable thing abou, Delivers 12 watts phone-20 watts CW, input to final. No complicated tuning procedure is necessary and a minimum her excellent operating is the fact that she is number of controls are used. blind. Those who quaked before the radio ex COMPACTNESS. The unit is entirely self-contained - aminer might be thankful they didn't have the power supply and all - in a cabinet measuring 1 O¾" task which confronted her. She had to explain all x 6¼" >< 6½" - and weighs 14 poun!fs. Because of the the diagrams as she didn't have the opportunity small size and light welght it is ex.ceUent for use at the home station or may be easily transported when vacotlon to draw them. By no means a shut-in, Dot is ing, visiting, or for field day activities. socially active and takes in hamfests frequently. Other YL's are taking the men on in various LOW INITIAL COST. The transmitter can be completely equipped with meter, tubes, crystal, niicro• operating activities and showing them a thing phone, and coils for operation on one band for approx or two at their own game. Marie Onnigian, imately $35.00. W6SPX, went into the annual 1.75-Mc. WAS AMATEUR'S NET PRICE contest, scored 56,700 points and came out sixth (LESS ACCESSORIES) on the list. History was made by local unit No. 3 of the Be sure to investigate the advantages of the 10P tr•ns• mitter, It is outstanding in every way. Ask your Jobber YLRL on the ARRL Field Day in June, as the about it. first all-YL entry. Under the leadership of Leta Bush, W9DBD, secretary-treasurer of the YLRL ill~ and editor of "YL Harmonics," the greater St. Louis YL's piled up around 2000 points. Assem S~R STANDARD bling near Alton, IIL, just across the river from St. Louis, the plucky group remained at their rigs throughout the night. Among the partic ipants were able operator Carrie Jones, W9ILH, TRANSFORMER the Illinois SCM and NCS of the 40-meter YLRL •CORPORATION• 1500 NORTH HALSTED STREET • •• CHICAGO net; Louise Baker, W9JTX; Alice-May Stewart, W9GOJ, and Helen Pallme, W9WVX. 78 LOW VOLTAGE TUBE ... LOW INTERNAL RESISTANCE with a IO to 1 safety factor More than a year ago, Eimac announced these Multi-Unit tubes to the industry under the statement "A Revolutionary Change in Vac uum Tube Design." They were developed in the Eimac laboratories for the precise purpose of providing a high power, low voltage (1000 to 2500 volts) tube having an extremely low internal resistance which would operate efficiently up to 200 megacycles' In actual operation Eimac 304T tubes are seeing service with as much as 20,000 volts on the plates ... 10 times the rated voltage. Where else is there a tube offering such a safety factor? It's just typical of Eimac's leadership ..• The triode units in these tubes are so neady perfclt in desjgn · that two or m9re can be placed within a another reason why Eimac tubes are to be found in the key sockets single envelope. Thus, the power capabilities are of most of the important radio transmitters throughout the world. multiplied by the number of unitt employed. Ex ample: 7~T having but ,. single uiode unit hu a plate dissipation rating of n wattt ... the Eimac 1'2T with two of the same triode units in a single bulb has ~ plate dissipation of 1,0 watt$ and the 304T FOLLOW THE LEADERS TO with four .of the same units has a. plate dissipation t.1f 300 w.itts. All other characteri!tics maintain the same ratio. Thus~ by simply re-neutralizing the uans. mittcr, these tubes may be interchanged without altering the efficiency of the ua.nsmitter. Available in both higb and low Mu types 152TL and '!04TL with amplilication faftor of ro ... l 52TH and 304TH Eitel-McCullough, Inc. San Bruno, California with amplification faftor of 18. El MAC REPRESENTATIVES ------California, Nevada Wash., Ore., Idaho, Mont. Chicago, l llinois, Wisconsin Texas, La., Okla., Ark. HERB BECKER, 1530 W. GENERAL SALES CO., G. G. RYAN, 549 W J. EARL SMITH, 2821 Live 104th St., Los Angeles, Cal. Verner 0. Jensen, 2605 • 07 Washington Blvd,, Chicago, Oak St., Dallas. Texas. N. Y., N. J., Penn., Md., Del., Second Ave., Seattle, Wash. lll. Ohio, Mich., Ky., Ind., Minn., Dist. of Col., Maine, N. H. N. Caro., S. Caro., Georgia, Mo., Kan., Neb., Iowa R. I., Conn., Mass. Colo., Wyo., New Mexico, Tenn., Flor., Ala., Miss. PEEL SALES ENGINEER ADOLPH SCHWARTZ, Arizona, Utah 14726 Elm Ave., Flushing, RICHARD A. HYDE, 42H JAMES MILLAR, 3-16 Ninth ING CO., E. R. Peel, 154 New York. Quitman St., Denver, Colo. St. N. E., Atlanta, Georgia. E. Eric St., Chicago, l\\. Export Agents: FRAZAR & CO., LTD. • 301 Clay Street, San Fr• ncisco, Calif. Each band contains its own YLRL net, with net control stations and everything. While nets were successfully operated on all bands, the RADIO TRAINING 10-meter net boasts more members than any other. "California, here we come!" could well have been the signature song of the 10-meter net (if FCC regs permitted music over ham rigs). Under the capable leadership of W6QOJ, nearly 50 YL's checked in at different times. As NCS, Helen marshalled all the formidable number who FOUNDED lN 1909 reported weekly and a few like Eleanor Rafli, ORT ARTHUR COLLEGE, a non-profit-making W6QXL, and Eunice Loyzin, WlBEQ, who Peducational institution, offers a practical radio never missed a sked. Particularly due to Helen's operator's course at the lowest tuition price in its efforts, her state now leads in memberships. Ohio history. Each radio graduate receives two months' actual operating experience at the college's commercial follows with New York, Illinois and Missouri broadcasting station KPAC. This station is equipped next in line. with the latest type 1000 watt high fidelity RCA The YL's take their DX where they find it, transmitter - 1250 kc. - directional antenna system. just like the OM's. They were particularly vigilant KPAC operates in new modern studios located on the campus. in following the U. S. Antarctic expedition. As 20-meter NCS, 2nd District chairman The college has never advertised jobs or position• in lieu of education. Today it ia well known there i1 a shortaJe of Dorothy Hall, W2IXY, successfully arranged a radio operator• in every branch of radio; particularly flight sked with KC4USA for the girls. Then just before and ground operator• for airline& in America and South America - marine operators for ahipa traveling coastwise pulling up stakes in Palmerland, Antarctica, and foreign - geodetic-geographic research - broadcast KC4USB devoted four solid hours to the YLRL atationa - the Army and Navy - other position• in many departments of the United States GovernmenL There!ore, and attempted to contact 25 YL stations who we believe it is good common sense to mention that Port had indicated their desire for a QSO. The lucky Arthur Colle~ is the sele radio school in America which owns a commercial broadcasting_ station with commercial ones whose signals penetrated that pot-pourri advertising rcpreaentativee in New York. Chlcaso., San of QRM as everyone and his brother called the Francisco, and many of Amcrica"a leading cities. with active membership in the National Association of Broadcaateca, East Base were WlFTJ, W3FXZ, W8NAL, and Broadcast Music Incorporated. Through these contacu W8UDA, W9FRR, W90WQ, W9NBX and the collece receives from the broadcaat industry alone more call, for radio operatora than it is po•sihle to supply. W9ZWL. Ruth Raub, W8ROP, enjoyed 57 QSO's with the expedition and was personally AUTHORIZED TO TEACH RCA TEXTS entertained by Dr. Siple, commander of the If inlere,teil. write for Bulletin R West Base, when he returned home. A number of YLRL members live in locations PORT ARTHUR COLLEGE that make them DX to the great body of main PORT ARTHUR (World-Known Port) land members. Radio probably means more to them on the whole than it does to those others, TEXAS · for one reason or another. Take K6TCW (The Cat's Whiskers) for exam ple, who found that radio offered adventure. One day Helen unearthed some "junk" belonging to RADIO OPERATING the OM since his ham days in Toledo, 0. Ques tions followed. His interest was renewed; he QUESTIONS""0 ANSWERS again took out a license. She followed suit. They Nilson &: Hornung', new edition covers all FCC moved to California. One nigh\ they talked to a commercial license exam clements. Standard hand• book 20 years. JZ.50, postpaid. Money back if not couple from Hilo wb.o had just arrived from satisfied and book returned in 10 day,. Send check or San Francisco. Both families expressed a desire money order ••• not cash. ctrctdar on r,qtust. F,,. to visit Honolulu and jokingly decided to seek HILSON RADIO SCHOOL, 51 East 42nd St., New York each other's company "if and when" they arrived. They packed, went to Hawaii, met their air friends and now play tennis together, again proving the world is a mighty small place via. ham radio. All who vocalize on 10-meter 'phone and have been fortunate enough to contact the two YL OK.AY. A lot of other hams do, too. · members of the Puerto Rico Amateur Radio. The new regs cause a lot of moving Club, Jenny Ramirez, K4FOW, and Alice. around. Here's a cheap wav of finding a Rodriguez, K4EZR, have experienced the chap who wants yours and has one you "smile" and warmth of their voices. want. Mary Davis, K7ENU, lives 70 miles from the Arctic Circle where the OM is in communications. See the paragraph at the end of work. She even helps him with the service jobs. Hamads, It explains how to do it in a and also finds time for her hobby of Indian bead very few words which at 7¢ per word loom work. Verna St. Louis, K7HUT, lives in a c9sts very little. village on remote Ugashik Lake. A smoking mountain is part of her scenery up there where- 80 OR either amateur or public address require Fments, Astatic's new N-Series Crystal Micro• phones, assure exceptionally smooth frequency response and grand all-around performance. These models are made with Astatic's swivel joint, MODEL tilting head for adjustment of microphone to semi N-30 directional as well as directional position, adding WIDE to its practicability and effective method of RANGE acoustic feedback control. Concentric cable con nector facilitates ·quick interchange of cable. • Model N-30 is a hi-fidelity, wide range micro MODEL phone, 30 to 10,000 cycles, substantially flat and N-80 free from peaks. Output level - 52 db below one VOICE volt per bar. Model N-80, voice range micro RANGE phone, output level -49 db below one volt per bar, with rising response to 3,500 cycles, provides • efficient speech characteristics to increase in LIST telligibility. PRICE Standard equipment includes 25-ft. $17.50 law capacity, closely shielded rubber covered cable with spring protector. CONVENIENT SWITCH ADAPTOR When so ordered, at little extra cost, a convenient On-Off Switch, as shown in accompanying illustration, may be had with either model in the N-Series Microphones. This is known as Type "S" Switch Adaptor, the purpose of which is to short the microphone circuit in "off" position. Model N-30S or N-80S, complete with Type "S" Switch, as illustrated, List Price $20,00 In addition, Astatic Microphones T-3, WR-20, WR-40, D-104 and K-2 may be ordered equipped with the Type "S" Switch. This switch is NOT SOLD SEPARATELY. YOUNGSTOWN, OHIO In Canada: Canadian Asiatic Lid, Toronfo, Onfarlo 81 the winds always blow. Y'ou can appreciate what rad.io means to these girls in Alaska. Mary's mail service is twice a week by plane from Fairbanks and Verna's QTH is 400 miles to the closest 'phone and railroad. Nell Cory, G2YL is an outstanding rad.io r"'L. She has made an intensive study of rad.io wave propagation and writes on u.h.f. activities for publication. Her lovely garden was transformed into a "sunken garden and ice pond" by un "All-out"production to meet today's friendly bombs. Constance Hall, G8LY, is the vramiding orders does n_ot mean that otJier English member. Yriplett has lost sight ot the broadr uirements of tomorrow. lnstea , The VE's - so near and yet so far - keep in req touch with the W girls by letter writing when research and engrneenng· · programsa. ,. actually have been "steppe -up ~o not engaged in doing their share in the defense assure constant improv_ement_s. rn program. Dot, VE4VO, uses her code and first products and processes;_ m ad~1Y:t aid knowledge in a Women's Service Corps. to needed developments m new he s. While returning on a train from a visit to VE5AEX, her mind on radio, she unconsciously Toda 's demands are important, whistled a "CQ". The conductor, passing, intro but the ~eeds of tomorrow ca!1not be duced h.imself as VE5MY. The "old" days were l' heed-and are anticipated m never fl ig in engineering and research de- recalled in a personal QSO wh.ich followed. agl g g nts yr OU have assurance that ve opme · Symbols in the months and years to com7, new The YLRL is now much more than a little Triplett products will serv~ m e~ band of pioneers, but the friendly comradeship panded fields, where they will dl[1t values and savings for every o ar that marked its beginnings still characterizes the organization. Esprit de corps is h.igh. Contests, spent in their purchase. parties, conventions, visits to YL's homes - all THE TRIPLETT ELECTRICAL have lent their bit in cementing friendsh.ips and INSTRUMENT CO. strengthening ties. The girls have their own Bluffton, Ohio emblem now, designed by the former president, W7FWB. It bears a scroll and t.he letters "YLRL" on the familiar d.iamond-shaped back ground t,hat has come to symbolize organized amateur rad.io. Ra,&io Stations, Police i Train for Radio, Depls., Airlines Vice-President Marie Corcoran, W8TPZ, and the OM donated a graceful engraved cup for the DEMANDING at a Government annual Anniversary Contest. It was first awarded Yeung Men, age 17-20 in 1940 to WlFTJ. A three-time winner can le avoid draft years Approved School claim permanent possession. Other YLRL symbols have corne into being, A RARE OPPORTUNITY to make good money quickly is now open to the high school graduate. Thousands of radio tech too. It was Clara Reger, W8KYR, who origi nicians are needed in defense work as well as in normal nated the YLRL expression "33" - meaning business. Men of draft age are being called. And employers "Love sealed with friendsh.ip between one YL are asking for YOUNG men from 1 i to 20 years old. and another YL." Jerry Burgett, W9HIG, 'Training for these positions paying up to $250 a month or started the fad of embroidering the girls' call more. is rapid and thorough by the Dodge method, so that past interest in radio, although an advantage, is not an letters and names on blouses and jackets. essential. Yon have the free choice today of accepting a low The YLRLeaguers have found a high degree paid job you do not want permanently, or training yourself of chivalry and honor accorded them on the ham for a well paid position in an interesting business. bands. A book could be written on the courtesies Accept this opportunity now. Prepare for the future in one of the most rapidly progressing industries. Ask any of our extended them, the donations in stationery, graduates about Dodge Institute. The Army has sent many money and membersh.ip certificates, the coop men here for advanced technical training during the past erative spirit shown them in sked and contest year. assistance. The boys even kept the frequencies Our next class opens Sept. 29. Act now! Get started on a clear during operation of the YLRL nets. The better future by filling out and mailing coupon for free catalog. reverse - sad but true - is likewise experienced, but those cases are in the minority. The girls ask no special favors but resent any badge of inferiority attached to them as opera ~!@!~l._ tors. Though emulating masculine supremacy, I 405 Monroe St., Valparaiso, Ind. I these women retain their feminine attributes. I Gentlem('n: Pleal'le mail me latest catalo~ without obligation I Their wants are simple and ordinary but their I Name.. I capacity for study and enjoyment is enormous. I A.ddre!& , - . . I They have knocked the pins out from under the I City...... State...... I silly sentiment about a "Woman's sphere," at L------J least in amateur rad.io work. 82 Not every application demands an inductor rated at 50 KW, but the same Engineering skill and Illustrated above are in precision workmanship may be ductors for the Columbia: Broadcasting System and found in all Johnson Products. Where depend the National Broadcasting Company for 50 KW ap• ability is of paramount importance, those who plications. In the upper photo insulation isAlsimag know specify Johnson, whether it is a standard 196 and in the lower two stock part or an especially Engineered and Mycalex is used. manufactured component. Ask your favorite ASK FOR THE NEW Jobber about Johnson Quality. CATALOG 966J E. F. JOHNSON CO . WASECA, MINNESOTA , l& uronr, U "4RHn ST., NEW fORff, ~. l, ' "M\!\iUf,\l'TUREHS Of RADIO THAIIISMITTIIIIG El)UIPIIIENT" 83 NOT TOMORROW OR NEXT WEEK OUT OF OUR BUT TODAY ENORMOUS STOCK! EACH AND EVERY SET A REAL VALUE! HALLI CRAFTER ECHO PHONE SKY CHAMPION EC-1 RECEIVER A real champion in its class, A sure•fire 6-tube com and a genuine favorite munication receiver covering with amateur operators. the entire tuning range from Nine tubes are used to 545 KC to 30.5 MC. Band make this receiver perform spread dial, beat frequency the way it must to satisfy. oscillator, phone jack. For $13.63 down-$7.22 use on 110 V AC or DC. per month for 6 months. SUPER DEFIANT EC-2 RECEIVER The most popular . receiver :: in the entire Hallicrafter line. Very satisfactory perform 12 tubes with coverage ance is obtainable with this from 540 KC to 42 MC. 8-tube set. Its features in "S" meter, crystal filter, clude a beat frequency os calibrated bandspreod for cillator, noise limiter, and l 1 0 V 60 cycle• AC. calibrated bondspread $23.52 down-$9.39 dial, external speaker in per month for 8 months. matching cabinet. For use on I 15-125 V AC or DC. $10.63 down-$8.45 per month for 4 month5. MODEL SX-28 EC-3 RECEIVER You can expect top per The EC-3 with 9 tubes pro formance from the SX-28. vides genuine communica This 15-tube receiver has tion set performance. Crys two stages of RF in addi tal filter, automatic noise tion to a noise limiter, crys• limiter, electrical band tal filter, and aalibrated spread, and separate bandspread tuning. De speaker in matching cabi signed to rigid specifica net are just a few of the tions. $44.87 down, and features. Down payment $17.84 per montb for 8 $14.88-$7.89 per months. month for 6 months.. NO FOOLING-IMMEDIATE DELIVERY means exactly what we intend it to mean as this advertisement goes to press. In stock at the present time are nearly 300 new radio receivers. They will not last too long, however, and we would like to make good our promise of delivery to each and every one of our good friends who want a new set. You can do your part by ordering early. IF YOU HAVE A RECEIVER TO TRADE, LET US QUOTE YOU AN ALLOWANCE ON IT BEFORE YOU DO BUSINESS 84 YES, SIR-We know that this improved model NC-45 will provide you with a first class receiver for your amateur station. Complete coverage from 540 KC to 30 MC in 4 bands. It will operate on either AC or DC on boat or on land. The best in radio engineering has gone into this receiver to make it tops in ifs class. A noise limiter has been added, and the slide rule type dial with calibrated main tuning and a separate scale for electrical band spread will make the handling of this receiver a genuine pleasure. Gray wrinkle cabinet with speaker in a cabinet to match. $14,38 down, and $7,62 per month for 6 months. • • • Only $43.63 down, and $17,34 per month for 8 months. There is little that we can say to add to the outstanding reputa tion already created for itself by the performance of the NC-200. For those who are not entirely familiar with this splendid receiver we might say that all of the engineering skill of the Na tional Company for which they are world famous has gone into this receiver. Twelve tubes are used with complete coverage on all of the amateur bands including 1 0 meters through the broadcast band. Noise limiter, calibrated dial, beat frequency oscillator, are all provided. • The NC-200 is an extreme- ly stable receiver, and one that you will be proud to own. 85 .A.A..R.S. A.etlvlties (Continued.from paqe 58) NEW SHURE WAR-AMATEUR SCHEDULES THE WAR contacts with amateur sta tions will continue for the present. A slight change ''VOICE'' in the schedules has been made to permit con tacts with stations in the 1750-2050 kc. band as follows: UNIDYNE WAR .Amateur Band EST I<'requencv Worked 9:00-10:00 P.M. _ .... Daily except CARDIOID Sunda.ve 6990 kc. 7000-7300 7:00- 7:45 P.M. - Saturdays only 4020 kc. 3500-3800 7:45- 8:00 P.M. - Saturdays only 4020 kc. 1750-2050 NOW - the famous Shure Unidyne Micro phone in a special series of "voice" models, More than 1600 different amateur stations too! Combines emphasis on "voice" response with all the advantages of the Shure true uni have been worked by WAR since the inaugura directional dynamic cardioid. Assures clear tion of these schedules on December 3, 1940. The speech without interference from background distinctive WAR QSL will be sent to all stations noise or echoes, indoors or outdoors. Cleans worked who have submitted their own cards. A up voice transmission - makes break-in number of amateurs have joined the AARS as a 'phone easy. Rugged, shock-proof. Model result of their contacts with WAR. .55AV -- for 35-50 ohm circuits, list price, $47. Model 55BV -· for 200-2 50 ohm circuits, FORM Net. 170 AMATEUR list price, $49.50. Model 55CV - high im~ QUESTIONNAIRE pedance, list price, $49.50. Patented hy Shure Brothers. ToE coding and tabulation work on the ASK YOUR JOBBER OR WRITE US TODAY Form 170 questionnaires, received from more than 41,000 amateurs, has been completed in the Office of the Chief Signal Officer. The information ·-. •SHOR£ 88t1THFR$ • has been transferred to individual IBM punch ~ ) 22511' HVR(ilf $1.,CHICAGO; llS.A, e, t:,1/11£ ADDNlSS•SHURFM/CRO cards. ICROPHONES &ACOUSTIC DEVICES The following were the various steps involved M (Continued on paqe 90) * OPPORTUNITY * ~tltnt J{ep!, UNLIMITED IT rs with deep regret that we re cord the passing of these amateurs: awaits the far-thinking individual "Tex" Anding, HI3N, San Pedro, Domin * who prepares now for the increased * ican Republic pay positions in the Army, Navy, or Leroy Clayton Babino, W9TXT, Rhine Commercial Communications field. lander, Wis. A serious shortage of trained code Bennett Emerson, ex-5DU-5ZG, Dallas, operators in each of these fields is Texas Lt. Kenneth M. Dwyer, ZS6DB, ex-lAD, * your guarantee of a promising * ,Johannesburg, South Africa future --if you are properly trained. John C. Gill, RM 1 c, U.S.C.G., W6OMV, San Bruno, Calif. BE SMART - start your training C. H. Hill, ZS4M, Bloemfontein, South NOW right in your own home. Learn Africa * code the practical way, the easy way * H. C. McIntosh., VE3ALV, Jackfish, On - the famous CANDLER way! tario Frederick ,J. Meschko, W2DDN, Flush THIS COUPON ENTITLES YOU TO ing, N. Y. YOUR FREE COPY OF THE FASCI NATING 52-PAGE BOOK OF FACTS. James Clayton Randall, WllIPI, SEND FOR IT NOW! WSTMU, Hartford, Conn. A/M H. Sperber, ZSlBH, Capetown, *CANDLER SYSTEM COMPANY Sout.h Africa Det,t. Q-10, Box 928, Denver, Colorado * Please rush me my free COP.Y of the 52-page BOOK George A. Turcott, WSNFG, Watertown, OF FACTS. I understand I will not be obligated in any N.Y. *way. * Charles Raymond Watt, W7BXZ, St. Name ...... Ignatius, Mont. Street and No ...... C. Wynne, ZS5CN, Eshowe, Zululand, South Africa City ...... State ...... •.• , • .' ... .. * * * * * 86 LONGER LIFE and GREATER SAFETY Thousands of satisfied amateur users take great pride in boasting of the ruggedness of TAYLOR TUBES in all classes of service including operation on 112 MC. Because of the greater safety factors, characteristic of all TAYLOR TUBES, longer useful life and better all 'round performance is assured. You Can't Beat Taylor for Economy & Service TAYLOR TUBES have built their own record of success under the most ad verse conditions of use ... where tube failures cannot be tolerated. TAYLOR'S basic policy of "MORE WATTS PER DOLLAR" and the famous broad guarantee of satisfactory service protects your investment and provides the utmost in dependable performance, value and economy. More and more amateurs are daily confirming the merits of TAYLORTUBES. For outstanding performance at the lowest cost always insist on TAYLOR TUBES PROTECT YOUR RIG! Ham shacks all over the country a-re bustling with activity as rigs and asso ciated equipment are being set up for a change in frequencies or just being put HMORE in better shape for amateur defense. Knowing WATTS aren't taking any chances when it comes to tube equip• PER ment. Be sure of your tubes ... protect your rig against unexpected failure ... retube with TAYLOR TUBES. DOLLAR'' TAYLOR TUBES, INC., 2341 WABANSIA AVE., CHICAGO, ILLINOIS 87 write him early. See nnnouncement on another page in this il'ISIIP~ Hope to see you aJl pre,:;eut. New EC's: AXA, Swamp s,·ott; GAG, Stoneham; MBQ, Vineyard Haven. NF is now OPS. New OBS: F.PB on B.S-Mc. e.w.; GDY, 14-l\lc. 'phone; UOU, 28-l\lc, 'phone; KTE. 3.~-Mc. 'phone; 1-VIQO, 112- aud 28-Mc, 'phone. Listen to these st:itions for the latest dope and tell them once in awhile that you listen to them they NEW K'i<:L.\NO 01\ISION are doing a. ,good sen--ice. AAR awl KSA put on a demon~tra Hon of 112-i\fo. mobile rig for the. Hoston H.ed Cro"8, FB, .'ONNECTICUT- SCM, Fred Elli!. WlCTl - \\'IA W fellomi. NAV applied for ORS: he is e-x-W8DFW. Weicome, C will be changing frequency to 3575 kc. from 3825 u.nd Lou. i\IJK is still out touri.n~ t.he country. AGX has portable l!J06 kc. from 1806. TD, KQ'.i, AGT and LTB have been 11:l-i\lc. rig, MQT applied for ().i{t;, JSi\I/1 has schedule ver:v bus,v running tests on 112-1\.Ic. emer~e..ncy equipment from Maine r,arnp with his da A.A.U.S. Aetivitles (Continued from paoe 86) in the compilation and recording of the data from these questionnaires: Each was checked for com pleteness of information and then coded with a numerical code for each question that was not self-coding. The IBM numerical code was used for the city, county and state address. An IBM card-punching machine was used to record the The Inside Dope ••. coded information on individual punch-cards. A * Here's what you see when you slip the dust different operator using an IBM verifying ma proof protective cap off a Clarostat wire .. wound control. A precision winding on bakelite strip; a chine checked the punched cards with their cor positive, smooth, wear-proof contact; perfected responding questionnaires for any errors. An lubrication; steel shalt properly fitted In brass bushing; obviously years of foolproof service. IBM interpreter machine was used to print the Why buy less? call letters and the coded answers to the twenty Ask your local Clarostat fobber for these wire• qUestions on the top of each punch-card. A second wound controls. Ask for latest data. Or write direct to Claroslaf Mfg. Co., Inc., 285-7 N. 6th St., set of punch-cards was reproduced for use of Brooklyn,1N. Y. Corps Area Signal Officers by the IBM reproduc ing and interpreting machines. ,e.. Strays :Js . ~ . WAR, apparently running down the call-book in reverse, worked WlNKW and WlNKV in • • • succession. - WlNKW. 90 GET A PORTABLE f . Look Ahead ! bg hallicrafters Be Wise • · S-29 wherever YOU go ••• IT goes • , • auvNOW . ce advances $17.35 Down •.. Balance In Before further pn Sti\\ Get 6 easy monthly payments, ·\ You can 6% carrying charge. and wh I e d lime \Vhether you stay in town. go to \mmediate Oe\ivery an camp, or move back to the farm ... the Universal Portable re- 1;:eiver will always be at your Payment Privi\eges . . . service! Operates on 110 volts AC or DC. or from self-contained batteries. Tunes from 542 kc to 30.5 me (553 to 9.85 meters). ::iolf- b':~~g;:afi1::~~·m~~!t!t~tli[~t~:.1~:k°i; ~j~~!i!i.ectrical Other Halllcrafters models may also be purchased on Newark's Easy Terms. 25% down, balance monthly SO SENSATIONAL WE'RE OFFERING IT AGAIN! Sliyrider .sx 211 by liallicrafters ~frl .BB pay 011ly · ,,.1/14,, ,, _ do,vn, add 6% carrying charge,. and pag tire balance in IJ months at !$1?.IJ4 per mont/1. Order direct from this ad,. enclosing down payment and credit references with your order. Cash Price $179.50 less speaker Regular PM 23 speaker in metal cabinet ...... $15.00 High Voltage Power •., NEVER AGAIN SUCH BARGAINS HOT OFF THE PRESS 1 TRANSFORMERS :, ·• Guaranteed Quality Built, Oil Filled, Impregnated BRAND NEW Newark's lar'ier volume ,} of amateur busmen makes tWs unmatched value FILTER CONDENSERS possible. Made by one of . CATALOG Write for youra now. ~f:e~lii~i;i-:~i::e~~~!~%~~ Get it fresh and new, in every Ham Rig. Guaranteed. As soon as the Jnk ii illustrated. Five Fllament Types. ~~~ :~ 59, ~~TRRY! dry! QUANTITIES LIMITED NEXT MONTH THEY'LL FREE! ~':i: 1°t~-3~tttr.~j -~i~ s1.15 2½ V.-3 amp; 2½ V.-7 amp. COST YOU MORE! YOUR CALL ~J;; ?~~~=~~~ts~?:~-~~ s1,95 Volts TAKE A LAST Mfd, DC. Size Price LOOK AT LETTERS ~·~:. ~~t\r~-t~c:)ftci::i v.~ s2.45 t 1000 5 x3~xl½ $ .59 3 amp; 5 V.-6 amp•...... THESE PRICES 18.3 1000 2.15 IN GOLD No. 4140 - 600-0-600 V. - 45 ••• THEN 2 2000 4½x3½xl; 1.50 200 Ma. Filam1;nts: ! .5 V.C. T .- s3 • 8 2000 5 x3~ x3 2.75 ., A. -5.0 v.c.T.-~ A. - 2.5 ORDER QUICK! ., 3000 5 x3 x3 3.75 lOe V.C.T.-10 A. Wt. 8½ lbs •.•. Sorry, boys, but a good thing can't last forever. Next month we'll Big shadowed decals, No. 4240 - 600-0-600 V. -- 45 have to raise our prices. But N.OW you can buy 'em at the lowest nearly 211 hia:h. For ham 200 M.A. Filaments: 6.;; V.- s3 • prices we've ever advertisedl Every condenser quality built by a shack door. windshield 4 A.-6.3 V.-3 A. - 5.0 V.- reliable manufacturer.• Guaranteed at rated voltage. YOU SA VE etc. Be sure to give your ;l A. Wt. 8½ lbs ••••••.••••• MONEY. because WE bought before prices jumped! i:-all letters. 91 (C'ontinucd/rom paoe 89) 8UQM 29 3AQN 37 311FE 2 3INH 9 3AKB IO 3BXE 62 o.ne in the Huntington area who is interested and would like 8O!\IL 4 :mxc 7 3AGV 2. to ioi11 the net should get in touch with hlm. NFTT finished MAR.YLAND-DELAWARE-DISTRlOT OF COLUM rehuilding his a-element Learn. lie also has beeu heard on BIA- l::lC.M. Hermann E. Hobbs, W3CIZ - HWT made 112 Mc. quite a bit lately. The net will operate on 56 !\le. in the biggest August total for his otation. GOQ has DK-3 the latter pal't of October. At this time no change has been transceiver, spetLt two weeks in l\lexico City and met made in the operating frequency of the Section. but it will W3APR as old DC ham of the 100 meter Yes. YOUR opportunity is here, NO\VI Our home study cuurses are '"made to order" for this opportunity. CREI To place QSL's on a cement wall, first cover trained men are in demand throughout the radio industry , . , an MAKERS OF RESISTANCE UNITS OF MORE TYPES IN MORE SHAPES FOR MORE APPLICATIONS THAN ANY OTHER MANUFACTURER IN THE WORLD NTERNATIONAL RESISTANCE CO., 401 N. Broad St., Philadelphia, Pa. 95 In the case of a signal out of audible beat with any 100-kc. point, the process is a little -Echo phone_ more complicated. Turn the receiver beat oscilla tor on and tune in the unknown signal to exact TOPS IN PERFORM zero beat. In most cases the tuning meter will no show this kind of zero beat, so be careful and list ANCE, LOW IN PRICE ten for a slow beat formed by variation of back Here are ruggedly constructed, dependable com ground noise as the b.f.o. and unknown signal munications receivers unsurpassed in value! alternately aid and buck. Note the dial reading on the receiver. Now similarly zero beat the nearest 100-kc. markers above and below the un known signal, and note the dial readings. Subtract the dial reading for the low marker from the dial reading for the high marker, and divide into 100. This gives us kilocycles per dial division. Now multiply this figure by the number of dial divi sions between the low marker and the unknown Eignal, and add the frequency of the low marker. The result is the frequency of the unknown signal, and the accuracy is usually limited only by the accuracy with which the receiver dial can be read, since this is, in most cases, much lower t,han the Six tubes. Three bands covering from 545 kc. to 30.5 accuracy of the marker signals. me. (5 SO to 9.85 meters). Electrical bandspread on all There will probably be some who doubt the bands. Beat frequency oscillator. Self-contained PM accuracy of this method of interpolation. They dynamic speaker. AC/DC operation- 115/125 volts. will point out that no variable condenser is ex Good selectivity and exceptional sen- actly "straight line frequency," which is quite sitivity. Every necessary feature for tip-top communications receiver per.. $24.so true. However, it can be shown that for a semi formance ...... circular-plate condenser when the capacity in use is not too small, the change in frequency over 1 / 1 o or le,as of condenser rotation will be essentially proportional to rotation. The error here will be much less than the error or reading the dial. Now, for sets using electrical bandspread, particularly of the parallel-condenser type, the error intro duced by considering frequency change as propor tional to rotation of the bandspread condenser will be even smaller, by the ratio of change in total capacity to total capacity in the drcuit. Thus, the method of interpolation outlined above will be valid for any case where the distance be tween adjacent 100-kc. markers is less than 1/io rotation (18°) of the main tuning condenser. The argument for tapped coil bandspread is similar. In any case, the dial divisions referred to are the equally spaced divisions on the "refer ence scale," not the frequency calibration on the receiver dial. If the receiver in use has shaped plates (and most of them do) the error will be still 8 tubes; 3 bands; covers 545 to 2100 kc. - 2.1 to 8.1 me. - 7 .9 to 30.5 me.; built-in 5" PM dynamic further reduced. speaker; preselection on all bands; calibrated band It will be noted that the output of the audio spread scale on 80/40/20/10 meter amateur bands; oscillator is brought out to a separate terminal. automatic noise limiter; electrical bandspread at all frequencies in the tuning range; oper.. It makes a nice tone for feeding into the speech ates on 115/125 volts AC;DC. Now, 50 amplifier to get those pretty pictures on the os for the first time, you can have all these $42 • cilloscope. And the output can very easily be features at this low price •.•.•....•• keyed for code practice or for i.c.w. work on 5 IN STOCK AT TERMINAL meters. Just put a key in series with the output jack. By the addition of a tap switch to connect various sizes of condensers at C22, together with a variable condenser (a 3-gang b.c. tuning con TERMINALR~ denser with the gangs pa~alleled) for fine adjust e04p. ment, we could have a variable audio frequency 68 West 45th St. • 80 Cortlandt St. generator too. We did not go to that much trou ble, since we have no particular use for a variable 2 stores in NEW YORK CITY audio tone. VAnderbilt 6-5050 • Cable: TERMRADIO This unit will, as stated above, put a marker signal on all the band edges except 160 and 96 DX-asA5-R4lo c-on 2~ METERS What we believe to he a new 2½ meter DX record was established on August 21, 1941. Armand Gamache, W2MPY, of Montrose, New York, working mobile from Mt. Katahdin, Maine, with an ABBOTT MRT-3, worked WIJFF of Newport, Rhode Island, a distance of approximately 335 miles. p CED radiophone trans UNUSUALLY Lo,y Rlwith s ecial VARIABLE mitter and ~eceiver that ppermits use of . . _3 _ 20 WATTS INPU~; ANTENNA t.ouP~IN:hile transmitting, a_nd New redesigned MR1 priced· ideal for u,1e lil maicitnUDl P.owe iver control. Effect1v-e ~ugg~d a~d cotnpactbo~~ or airplane; ~itnpl~ t~ enable~ fte:nh'; te'so miles depending ~pod automobile, truck,. atisi'actory operatlilg_ r~gd range is from EA SY TO LE AR N CO D E 1t ia eaBy and µJeasant to learn or increase i;;di:hc:;13~eTe:':he-;: w~c:1t!i1 \~c~g; beaPnner or advanced student. A quick and practical method. Available tapes from be- fi,'t,'j~_ aJ"~!3~t~1i~~ffl'.'"A?~! ready, no ORM, beats havin,r someone send to you. MACHINES FOR RENT OR SALE The lnstructo!l-raph Code Teacher liter ally takes the place of an operator-instructor and enables anyone to learn and master cnde without further assistance. Thousands have National Champion Jirn Walker used and endorse the lnotructo!lraph System. Write today for full usea RCH receivers, transmitters particulars and convenient payment and rental plans. and antennae. A•k your dealer or send 10c for illustrated Instruction Manual. INSTRUCTOGRAPH COMPANY RADIO CONTROL HEADQUARTERS, INC. 4709 Sheridan Road, Chlcallo, llllnola Re/,re.senlali"' for Canada: 330 West 4Znd Street New York Cay Radio Colleae of Canada, 54 Bloor St. We,t, Toronto 97 the ends of the 20-meter 'phone band, which can be found by interpolation on the receiver dial. It therefore will comply with the F.C.C. rules which only require means to insure that the transmitting frequency is inside the band. Properly used it will measure frequencies with a high degree of accuracy. Ours cost just $1.17, not including cabinet; we had to buy the chassis, R1, and S5, the rest came from the junk box and from old b.c. sets we inherited from the ash can. Others may not be quite so lucky, but it should be possible to build the unit for less than $10, plus a little help from the junk box. Cost of new Poper tubulors in parts is $12.05: Isn't that cheap for frequency colorful yellow, insurance? black and red lobe! wrd.ppers. • Yes, even these inexpensive paper Eleetion Notiees • tubulars by Aerovox are individually Heavily waxed tested. That's true of every Aerovox con• (Continued from page //!I!) idckets and generous denser, whether ii be a ten-dollar Xmittins wax-sealed ends for capacitor or a ten-cent paper tubular. Each of the machinery of self-government in ARRL. protection agoinst and every Aerovox condenser is pre• They provide the constitutional opportunity for moisture. tested for your convenience, your rig•s per• members to put the direction of their association formance, your pocketbook. in the hands of representatives of their own • • Ask jobber for new catalog. In 400, 600, 1000 choosing. Members are urged to take the initia and 1600 v. D.C.W. t.ive and to file nominating petitions immediately. For the Board of Directors: • K. B. wARNER, .A.II popular capaci Secretary ties from .001 to 1.0. • A Lecher Wire System LEARN RADIO• TELEVISION (Continued from page 19) 60-pase catalog on request. Oldest, l<,r9est end best allows the block to slide freely, the wires being equipped In New Ensland. New classes now formlns. Write for new catalog. pressed down on the bar only when an actual MASS. RADIO SCHOOL reading is to be taken. A small piece of wood held 18 Boylston Street Boston, Massachusetts in the hand can be used for pressing them down, and it is an easy matter to regulate the pressure so that free movement is secured. It would be relatively simple to arrange a spring device for COMMERCIAL RADIO INSTITUTE the same purpose. A rodio trolning center for over twenty yeors. Well equipped. Ai3 it is convenient to mea8ure lengths directly Excellent loculty. Procticol resident courses In Rodiotelesrophy, in the metric system used for wavelength rather Broodcost, Servicing, Television, Aeronautical, Drolling, Mothe motics, lndustriol ond Studio Technique. Plocement bureou. than in inches, the top of the "T" beam has been Foti term Oct. 6. Send for cotolog. Dept. 8. marked off in decimeter (IO-centimeter) units. 38 WEST BIDDLE STREET, BALTIMORE, MARYLAND Since t.hl'l photographs were taken a 10-centi rneter transparent scale (also obtained at the five-and-ten) has been cemented to the slider, extending out from the front, so that readings SICKLES COILS can be taken to the nearest millimeter. Thus the ALL TYPES OF RF AND IF WINDINGS difference between any two readings on the scale gives the half wavelength directly. Manufactured l,y The "T" beam will tend to bow outward if the F. W. SICKLES COMPANY turnbuckles are tightened too much, which will P.O.Box920 SprinsAeld, Mass. bend the scale slightly out of parallel with the wires. It is best to use just enough tension to keep Do YOU want to be a Government radio operator? the wires fairly taut, but not enough to put an Why not learn to be an appreciable bend in the wooden member. This operator Quickly and easily with the Ayers Automatic makes the slide move more freely and also helps Code Machine all electric. 50,000 words practice tapee avoid small errors in measuring the length. available, low monthly rental. Tapes for Mac Auto,. Recordin& slips and More Accurate Measurements Recordin& inka. It would be difficult to stress too greatly the Write AYERS AUTOMATIC CODE MACffiNES 711 Boylston St., Boston, Mass. importance of using loose coupling to the source 98 Simultaneous RADIO RANGE FILTER This Simultaneous Radio Range Filter represents the highest achievement in precision engineering technique. It is one of Kenyon's great contributions to the aircraft industry for it is used extensively by all the major airlines throughout the world. Each unit consists of combination Band Pass, Band Rejection Filter wholly enclosed in an aluminum case with black, egg-shell finish. Will hold their electrical characteristics from -40° to 55° Centigrade. Kenyon No. S-6353 (BA-189) Radio Range Filter-Price upon request COMPLETE TECHNICAL AND MECHANICAL DATA AVAILABLE KENYON TRANSFORMER CO., INC., 840 Barry St., New York, N. Y. AMATEUR RADIO LICENSES Day and Evening Classes In Code and Theory HOME STUDY COURSES Reasonable, Efficient and Thorough Hundreds of Licensed Students Now on tne1 Air American Radio Institute, 1123 Broadway, New York, N, V. PRECISION·Series844·34 RANGE AC·D C VD LT· DHM·DEC I B EL·M I LLIAM METER Be a ~I.ASTER Radioman • 6000 VOLTS Get your training at home under personal supervision of A. R, e 10 MEGOHMS Nilson, noted te!'hnical radi_o a~thor. Low-cost home-study radio commumcauon courses can e 12 AMPERES fit you for job, advancement, or license exam 1,000 ohms per volt inations. Send for Free booklet, "What The AC and DC Modern Radioman Must Know." ii * 6 AC and DC voltage NILSON RADIO SCHOOL, 51 East 42nd St:; New York ranges lo 6000 volts * 6 cur rent ranges to 12 AMPS * 4 resistance ranges to 10 MEGS * SIX DB ranges lo 70 DB * SIX output ranges lo 6000 RADIO COURSES volts * 4¼" 400 microam Start October pere meter * 1 % wire RADIO CODE wound bobbins and matched RXf>ft~\ik 1925 copies - (except Jan., Mar., May and July) ...... $2.00 1926 copies - complete...... 2.50 1927 copies -(except Jan., Feb., Mar., Aug., Sept.) ...... 1.75 1928 copies- (except Jan., Feb., Mar., Aug., Sept.) ...... 1.75 1929 copies - complete...... 2.50 1930 copies - (except Jan., Feb., Apr. and July) ...... 2.00 You should have at least 1931 copies -(except November) .. 2.50 two of them - one for you11 1932 copies-(except Feb., Aug., Sept., Oct.)...... 1. 75 complete 1940 file of 1933 copies -(except January and copies, and one for each February)...... 2.50 1934 copies - complete...... 2.50 1941 issue as published. 1935 copies - complete...... 2. 50 1936 copies - (except April)...... 2.50 • With each Binder is furnished a sheet of gold 1937 copies - complete ...... 2.50 1938 copies - complete ...... 2.50 and black gummed labels for years 192.2. 1939 copies - complete ...... 2.50 through 1941. The proper one can be cut from 1940 copies - complete ...... 2.50 the sheet and pasted in the space provided for Single copies, 25¢ each, and Yearly it on the back of the bind~r. Sets at Price Indicated, Postpaid Price· $1.5 0 postpaid Foreign, add 50¢ for Yearly Sets Available only in United States and Potsesslons American Radio Relay Leasue West Hartford, Conn. 101 Around the World \\rlth the RADIOMEN Yankee (Continued from vaue 14) ARE IN DEMAND Al ,lackson, WINI, in West Hartford, also Ever since the inception of Midland Airline training helped us with contacts from time t.o time. the demand for our qualified graduates and student; In addition several eontacts were made with has exceeded the supply. Now because of the acute W9DWD, W2FA, W2FJ and others who very shortage of skilled radio operators and maintenance kindly offered their services. men, the demand has reached a new high. Soon after the Y ankre left on its world trip, my wife decided that she would take up ham REAL OPPORTUNITY - Midland training offers radio. With the help of Al Carr, WILOH, Al you exceptional opportunity to put your hobby to .Jackson, WINI, Pat Clancy, WIBAH, and sev work. Steady, well-paid positions in the Air Transport eral of the other hams around Hartford she man and l!roadcast Industries await the man with required aged to get her ticket in January, 1941, with the qualifications. call W°lNDT although she had absolutely no knowledge of radio beforehand. Pat Clancy built INVESTIGATE NOW - Investigate Midland train up a "fool-proof" transmitter for her, and during ing now! Write or wire for a free copy of our pro• the last part of the trip I was able to talk directly fusely illustrated 58-page booklet and training out home. line. No obligation. Liberal terms. Combination The two most important factors in maintain Extension-Resident training or straight Resident train ing schedules were picking the correct times and frequencies and the antenna systems used. When ing. Refresher courses for men with commercial licenses. we were in the open ocean WCFT could put out a pretty consistent signal, but if we were in the MIDLAND RADIO , vicinity of an island with the land between us and WlAW our signal would drop off sharply. SCHOOLS, Inc. In receiving, the rhombic was of great aid to nL:V~:,oN f WlAW; several times they could copy us when Dept. Q-1 O, Power & Light Bldg., Kansas City, Mo. 'WINI could just barely hear our signal. The ex act times of schedules was also very important. Near Singapore there was only a small period of the day, usually about sunrise in the United States., when the 40-meter 1:,igna!s would get through. ANNOUNCING Although not much traffic was handled with the commercial stations, we always found them very obliging. Amateurs can learn much from A NEW MASTER TELEP LEX the clean-cut traffic handling done by the com mercials. Some idea of their problem can be had To Teach You the Code by listening to them during a busy period. At The Master Teleplex Christmas time last year, the RCA station WCC Code Teacher has been had 108 ships on their traffic list and WSL, the streamlined to make it easier for you to learn Mackay station, had 78. This meant that the the code. Yes, the same stations had to be handling three or four boats at engineers who devel• oped the original Tele the same time, as there were a corresponding plex have worked out number of messages eoming from the vessels. an entirely new princi ple. This new machine Three or four operators would be employed on the records your sending same frequency, all keying the same transmitter. visibly by a brand new method on a specially Even with all the traffic, the co=ercials never prepared tape and also tried to rush a message, realizing that sending sends back your own key work at any speed you wish. Thu, the message once at a reasonable speed was bet you learn by hearing as well as seeing. There are NO PER .. FORATIONS - NO INK. ••• A marvel of simplicity. ter than a series of repeats. Everywhere we went Teleplex machines are used by many schools teaching the we found the commercial operators always glad code. Regardless of whether you wish to learn code as a to see us and offering to QSP for us at any time. hobby, a vocation, or to teach, you will surely want to see this new Master Teleple,t. We furnish you a complete course, Another interesting point that was noticed including practice messages, the new Master Teleplex plus a on the trip is that when we were within 5 degrees personal service on a money back guarantee. Low Cost. Easy terms. Special trial offer to any responsible defense unit. of the Equator, either north or south, signals on Write for complete information. all frequencies fell off sharply, arid around noon there was almost a complete fade-out. TELEPLEX 107 Hudson Street The transmitter carried on the present trip Dept. 010 was built by Eurich and was designed to combine COMPANY Jersey City, N. J. efficiency with stability and ruggedness. Brass was used throughout to minimize corrosion by 102 A directory of suppliers who carry in stock the products of these dependable manufacturers. V'fJLe,- .· INST-RU MINTS ALBANY, N. Y. Uncle D•ve's R•dio Sh•ck 356 Broadw•y ALBANY, N. Y. Uncle Dove's Radio Shock 356 Broodw•Y ATLANTA, GEORGIA 265 Pe•chtree Street Radio Wire Television Inc. ATLANTA, GEORGIA 265 Pe•chtree Street BOMBAY, INDIA E•stern Electric & Engineering Compony Radio Wire Television Inc. BOSTON, MASS. Radio Sh•ck 167 W•shington Street BOSTON, MASS. R•dio Shock 167 Woshington Street BOSTON, MASS. 110 Federol Street R•dio Wire Television Inc. BOSTON, MASS. 110 Federal Street BRIDGEPORT, CONN. 177 Connon Street Radio Wire Television Inc. Hotry & Young, Inc. BRONX, N. Y. 542 Eost Fordhom Rd. BRIDGEPORT, CONN. 177 Cannon Street R•d!o Wire Television Inc. Hotry & Young, Inc. BUFFALO, N. Y. 1531 Moin Street BRONX,N. Y. 542 East Fordham Rd, Dymdc, Inc. Radio Wire Television Inc. BUTLER, MISSOURI 211-215 N. Moin Street Henry Rodio Shop BUFFALO, N. Y. 1531 Main Street CHICAGO, ILL. 833 W. Jockson Blvd. [)ymac, Inc. Allied Rodio Corp. BUTLER, MISSOURI 211-215 N. Motn Street CHICAGO, ILL. 901--911 W. J•ckson Blvd. Henry Radio Shop Rodlo Wire Television Inc. CINCINNATI, OHIO 1103 Vine Street CHICAGO, ILLINOIS 833 W. Jackson Blvd. United Rodio, Inc. Allied Radio Corp. DETROIT, MICH. 325 E. Jefferson Ave. Radio Specialties Co. · CHICAGO, ILL. 901--911 W. Jackson Blvd. DETROIT, MICHIGAN 11800 Woodword Ave. Radio Wire Television Inc. Radio $peciolties Co. HARTFORD, CONNECTICUT 227 Asylum Street CINCINNATI, OHIO 1103 Vine Street Rodio Inspection Service Compony United Radio, Inc. HOUSTON, TEXAS 1021 Coroline Street HARTFORD, CONN. 203 Ann Street R. C. & L. F. Holl Hatry & Young, Inc. INDIANAPOLIS, INDIANA 34 West Ohio Street Von Sickle R•dio Supply Co. LITTLE ROCK, ARKANSAS 409 W. 3rd Street KANSAS CITY, MO. '1012 McGee Street Beem Radio Compony Burstein-Applebee Comp•ny LITTLE ROCK, ARKANSAS 409 W. 3rd Street MINNEAPOLIS, MINNESOTA 1211 LoSolleAvenue Beem Radio Compony Lew Bonn Compony NEW HAVEN, CONN. 1172 Chopel Street H•try & Young, Inc. NEW HAVEN, CONN. 1172 Chapel Street Hatry & Young, Inc. NEW YORK, N. Y. Horrison Rodio Co. 12 West Broodway NEW YORK, N. Y. 100 Sixth Ave. NEW YORK, N. Y. 100 Sixth Avenue Radio Wire Television Inc. Radio Wire Televiston Inc. NEWARK, N. J. 24 Centrol Ave. Rodio Wire Television Inc. NEWARK, N. J. 24 Centrol Ave. Radio Wire Television Inc. READING, PENN. 404 W•lnut Street George D. Barbey Compony READING, PENN. 404 Walnut Street SCRANTON, PENN. 519-21 Mulberry Street George D. Barbey Company Scronton Radio & Television Supply Co. WASHINGTON! D. C. 938 F Street, N. W. WASHINGTON, D. C. 938 F Street, N. W. Jun Radio & Service Supply Co. Sun Radio & Service Supply Co. Listings on this Paue do not necessaril.Y imply endorseme»t by QST of the dealers or of other equipment sold by them. 103 salt air and spray, and the construction was made as heavy as possible. An RCA 803 was used . in an electron-coupled oscillator circuit with an input of approximately 200 watts. The oscillator circuit was operated at half the dr,sired frequency and the harmonic taken in the plate section in order to maintain stability and minimize fre quency changes due to the swinging of the an tenna. An ingenious "plug-in" coil drawer with pretuned circuits was provided so that the trans The LOW-PRICED communication receiver mitter could be changed instantly for use on the that is so popular, especially with men in intermediate ship wavelengths of 600 to 800 me the services. ters and the short wavelengths of 18, 24, 27, 36 meters. Since 36 meters was found to be by far the best all-around wave, it was used about 90% of the time. WlAW's signal on 40 meters was consistently good practically the whole way around, and American stations- were heard much more often on 40 than on any other band. Signals on 14 Mc. would be very good one night and EC-1 practically non-existent the next night. I believe that the antenna systems had much to do with COMPLETE this as we would hear one amateur every night while we were in one locality and then when we s24.so moved another amateur's signal would become • Three Bands the outstanding one. • PM Speaker Power for the transmitter was furnished by a • Six Tubes motor-generator running off the ship's 110-volt e AC-DC-115/125 volts bank of storage batteries. This furnished 110 Electrical bandspread on all bands. volts of 500 cycle a.c. which was stepped up and Beat frequency oscillator. Bandspread logging scale, rectified by 866's to furnish 2000 volts for the 803. Isolation for headphones through phone circuit trans The 110-volt a.c. was also stepped down for use former. Dial calibrated in megacycles with service on the filaments. In consequence none of the bands indicated, filaments of the tubes were lit until the generator was started and transmission always began with All Other Communication Receivers cold tubes. When the ship's batteries were low * HALLICRAFTERS ... all models in the line voltage would be down to around 95, stock now for immediate shipment. with corresponding lowering of the filament volt * HAMMARLUND •.. "HQ-120-X" and ages. Yet in the year and a half of operating no the "SUPER PRO" ••• both available trouble of any kind was experienced. immediately. The receiver was my own HRO which was changed over for 6-volt operation and was used * NATIONAL, * HOW ARD and other with a storage "A" battery and "B" batteries. recognized makes are now on hand. A vibrapack was purchased in Singapore and CAMERAS and CAMERA was used instead of " B" batteries for the last part of the trip, and it worked very well. ACCESSORIES The antenna, always a problem on a sailing ... are in a separate department, but vessel, was a single vertical wire running from attractive trade-in allowances or "swap" the deck to the cross trees of the mainmast. The deals can be arranged on camera for length to the set was approximately a half wave radio or radio gear for camera equip• on 36 meters, and it worked out remarkably well. ment. What have you? Of course, on 600 meters it had to be loaded so heavily in the cabin that not very much was W211L • W2L1A. • W2PL • W2KWY radiated. Nevertheless, the results were satis factory for our use as our only 600-meter contacts were with passing ships and with coastal stations when we approached a port. In conclusion, I wish to thank the many ama teurs -and commercial operators that we met on the trip and over the air from home for their kindness and cooperation. It has been impossible to name every one of them in this article, but their hospitality and help will always be re membered. CABLE ADDRESS: "HARADIO" 104 HARRISON f01L HAMMARLUND and SERVICE! PRICES? No matter what happens to prices - here at Harrison our large scale purchasing and our tremendous stock enable us to continue to give you the lowest possible prices at all times. It pays to buy from Harrison! DELIVERY?* With production facilities already greatly over taxed, deliveries are falling behind more every day. But, we anticipated this "Back-order Era" and placed protective orders many months ahead. Right now we have more receivers, parts, tubes, etc. on band than at any time in our busy sixteen year history! You gel/aster delivery from Harrison! * TRIAL? A world famous receiver! Strictly up to * When you bur anything from Harrison it has to the minute with the kind of perform be entirely' satisfactory or you don't keep it. Try ance required by the exacting pro out your next receiver for ten days without fessional, amateur, or short wave listener. Dual stabilized· with elec charge or obligation by ordering it from us. tronic voltage regulation and drift You get 100% cooperation from Harrison! compensation! Twelve tubes, high gain RF stage, antenna trimmer. three IF stages with silvered con densers and permeability tuned * transformers. Covers 9. 7 to TRADE-IN? 5 5 5 meters in six bands with By fair dealing we have built up the largest calibrated bandspread. Reconditioned Receiver business in the world! Harrison has ii- in stock! We have a ready market for your old set, and that means we l."'an give you the very best trad~in allowance. (We also bay receivers, transmitters, The. HAMMARLUND etc., for cash.) "SUPER-PRO" You get the best deal at Harrison! One of the most desirable com munications receivers available to { Send for latest list day! 18 tubes, improved noise lim * of *New and Re iter, two stages of preselection, superb Certainly! Charge Account or Easy Payment conditioned Sets} audio quality, and many other features Plan. Buy your Receiver, transmitter, parts, etc., that make it "tops." Two models: 15 to on our easier terms at lowest cost 5~0 meters, or 7 1/2 to 240 meters. Your credit is good at Harrison! GUARANTEE?* Everything is "guaranteed," but your best guar antee is the integrity of the person with whom you deal. Here at Harrison we go far beyond the standard warranty in order to please you! Yott get a sq11are deal from Harrison! rn be looking* for your order! 73, BILL HARRISON, W'JA VA HARRISON RADIO CO. * · 12 WEST BROADWAY • NEW YORK CITY , . * WOrth 2-6276 * 105* :rnnrl n-rorof-il"ollu- fho. 'nrhnlo. UJ'ou Now you can buy all these PM speaker housed in matching communications features at mod cabinet. CW monitor. 10 tubes. erate prices. Echophone, Model 3 bands. Covers from 550 to EC-3: Crystal filter (four posi 2100 kc. - 2.1 to 8.1 me - 7.9 tion variable selectivity). Cali to 30 me. Electrical bandspread. brated bandspread, automatic Operates on 115 volts AC/DC. noise limiter. Preselection on all bands. Two stage IF amplifier. Echophone ( Model EC-3) Fly-wheel tuning. Separate 6" $59.50 ECHOPHONEtt"E!!J:iorld" RADIO CO., 201 EA.ST 26th ST., CHICA.GO, U.S.A.. 106 SELL - QSTs January 1924 to December 1939 inclusive, in good spape. Also brand new unused Eimac 75T, Amperex 801, Guarihan XlOO overload relay. Best offer. W6POA. SELL - Hickok RFO~5, 180-X generator. Like new, best cash offer. Also Riders 10 & 11, Solar BQC, RCP 411, 504. ,Jackson HAM-ADS 634-D, cheap, write: E. 0. Heysek, 1st Bn. liqs., 80th A.R., Pine Ca.mp, N. Y. · naUk/ttfn\1:r~t i~~a.f1~!~ai~uisa~~ e~~~t~~ f~ their pursuit ol the art. Q-8L'S-SWL'S. Colorful, economical. W9KXL, 819 Wyan 2 dotte, Kansas Cit,y, Mo. an~ l.p~'lJ1i~la[gfJ;Jil~a~h,;';,,";.~;~t?~:g:;ef;ejl ~~\,";t SELL- Hallicrafters HT6 transmitter wit,h coils aud ECO capital letters ~e used which wollld tend to make one adver tisement stand out from the others. unit., for all bands. Used less than 6 months. $120 or best offer (3) The Ham-Ad rate ls 15¢ per word, except as noted In gets it. W9RSN, Robert Hill, 401 E. 15th St., Anderson, Ind. 0 P8[ffr~~ffla~~~ ~· lu!1 must accompany copy, No Cash or NJi]W England Division A.R.R.L. Convention, Boston Ham contract discount or agency comm!sslon wlll be allowed. fest, Hotel Bradford, Boston, October 18. (5) Closing date tor Ham-Ads Is the 25th ol the second FOR sale: new RCA transmitting tubes in original cartons at a montb preceding publication date. bargain price, send stamp for list. Lowell Ecker, Sedan, Kansas. (61 A special rate ot 7¢ per word wm apply to advertising which, In our Judgment, Is obviously non-commercial In QSL'S. Finest. Samples. Maleco. 1805 St. Johns Place, Brook nature and Is placed and signed by a member of the Ameri lyn, N. Y. can Radio Relay League. Thus, advertising ol bona tide surplus equipment owned, used and !or sale by an Individual 85 watt transmitter, 100 watt modulator, complete, excellent or apparatus offered for exchange or advertising inquiring condition, $85. W3HHE. !or special equipment, If by a member ol the American Radio Relay League takes the 7¢ rate. An attempt to deal In a~- WANT latest model cotnplet.e HRO or Super Pro. Lieut. Macy, 1 1 AFRTC, Ft. Knox, Ky. ~fzri'=ci1qi'ii'.\'t!Jf .13~JH's~ ";;'Ji~ bf..:~ \'t~ 'i ff~~te~ NATIONAL NTX transmitter, extra holder, eight rrystals; Provisions ol paragraphs (1), (2), (4) and (5) apply to all advertising In this column regardless of which rate may matching NSM modulator both perfect, like new; cheap. quick. apply. W2WD. PRACTICALLY new kilowatt transmitter - phone and CW. Having made no investigation of the adver Heavy duty parts. A good bargain for any ham who wishes to inve.st in a complete kw. or kw. amplifier. Write for details. tisers in the classified columns, the publish WlLUN, Theodore C. Hamlin, Newtown, Conn. ers of QST are unable to vouch for their SELL - complete Rider's III, V, VI. VII, index; incomplete integrity or for the grade or character of the combination type Vol. I; $18. Baier, 202 Riverside Drive, products advertised N. Y.C. NEW England Division A.R.R.L. Conventfon, Boston Ham fest,, Hotei Bradford, Boston, October 18. NEW transmitting kits all phone and CW from 15 watts QUARTZ -direct importers from Brazil of beat quality pure through 150 watts. Also new ECO unit for $35, New 40 meter quartz suitable for making piezo-electric crystals. Diamond phone transmitter reMonable. Also plenty of 40 meter crystals. Drill Carbon Co., 719 World Bld11:., New York City. Write for details today. Leo, W!'lGFQ, QSL'S. Cartoons. F'reA samples. Theodore Porcher, 7708 Navajo, RECEIVERS - all types - new and reconditioned. Easy Philadelphia, Pa. terms. Free trial. Send for big list aod other specials. Get ac CALLBOOKS - Fall edition now on sale containing complete quainted with Leo, W9GFQ. up-to-date list of radio hams throughout entire world. Single TRANSMITTING headquarters on latest Stancor, Thordarson copies Sl.25. Canada and foreign $1.35. Radio Amateur Call atld other kit.s - commercially wired at low CORt. New 70 watt Book, 610 S. Dearborn, Chicago, transmitter kits complete only $35. _., __ speech amplifier modu COMMERCIAL radio operators examinat.ion questions and lator up to 80 watts at $25 - up to 150 watts $49.50. New answers. One dollar per element. G. C. Waller, W5ATV, 6540 HY25's at 99,!. New HY51's at $2.95. Easy terms. Write Leo, Washington Blvd., Tulsa, Okla. W9GFQ, today. QSL'S -·- Brownie, W3CJI, 1725 Fraokenfield Ave., Allentown, LEO, W9GFQ, offers the hams more and a better deal always. Pa. Lowest terms without red tape on all new and used equipment. 'I'EL·E"""P"LE-.,,'XE""'"S',-;clns--ct-r-u-cl,..,o-g_r_a_p'hs-.b'o_u_g'b"'t-,-•-o'ld'.-.R"'y-an-.''s,-.H"'an-- Free trial, personalized service. Write for big free ham bargain nibal, Mo. - catalog and used receiver list. Wholesale Radio Labs., Coundl QSL'S, S WL's. 100 - 3 color- 75¢. Lapco, 344 W. :mth, Bluffs, Iowa. Indianapolis, lnd. CRYSTALS: famous P.R., mounted in latest Alsimag 35 hold ers - 40, 80 meter PR-X, 160 meter PR-Z $3, 40, 80 meter 1000 watt G.E. transformers 1100-2200-4400 volts each side c.t. PR-Z (low drift) $3.50; 20 meter PR-20 $4.50; unconditionally Guaranteed $13.50. Dawson, 5740 Woodrow, Detroit,.Mich. guaranteed. Immediate shipment. Quality blank 7.0¢. Whole QSL'S & SW L's - Fritz, 1213 Briargate, Joliet, Ill. sale Radio Labs., Council Bluffs, Iowa, W9GFQ. i1i'EW Enidaod Division A.R.R.L. Convention, Boston Ham SWAP or sell - Weston model 372 capacity meter, zero to 3 fost, Hotel Bradford, Boston, October 18, µfd. $50-'- Jas. Biddle Megger zero to 100 megohms $50- TWO modern traosmitters, bargains, 300 watt CW, 250 phone. RCA TMV-122B 3" scope $50 - General Rotary 3 element 10 W2JBW. m. beam everYthin!jl $60 -· Pioneer 400 watt 110 a.c. gas driven CRYSTALS, commercial or amateur: police, marine, aircraft, generator $40 - General Radio absorption frequency meter defense projects, etc. A complete line of dependable crystal $10-.. Gross Eagle receiver (new) $10. WANT Hallicrafter _827 units is available for commercial services. Over a period of years, reciever or HT6phone-Abbott DK3 or MRT3-Je.nsen Bass Eidson commercial crystals have a record of 70.7% repeat reflex speaker - DM36 or good 2½-5 m, converter - Zeiss sales - satisfaction set that record. Send for catalog. Amateurs: Contax II or Leica camera--· good 35 mm. still projector - those unbeatable T9 40 and 80 meter crystals still sell for $1.60. wide angle or telephoto lens for Con tax II - or what have T9 spot frequencies 40 or 80 meter bands $2.50 or $3,60 with you? Lou Springer, W8BGV, Auburn, N. Y. holder. Order from J!Jidson ts, Temple, Texas, or dealers pre CRYSTALS for all bands but 10. Write your wants and for ,-iously listed. Wanted: Experienced crystal ln'inder, write us. price.s. W8KJ. QSL samples, prices on request. W2AEY, 338 E!mora, Eliza-: USED Thordarson - Standor - UTC parts A-1 condition for beth, N. J. sale. Also various types transmitting tubes. Send stamped ad SELL: RTL model TR112 2½ meter transmitter, receiver, dressed envelope for list to W8ICQ, Piqua, Ohio. power supply, $30. Portable: transmitter, 6C5, 6L6, TRF re TRANSMITTER 150 watts CW complete, new, be.st of parts; ceiver, a.c. power supply, 300 volt vibropack, $30, f.o.b. De $60 takes it. W3ASQ. troit. Dr. Grant, W8NXT. EMERGENCY portable power - 750-watt, 110 a.c. 60-cycle. WRITE Bob Henry, W9ARA, for best deal on all amateur re .Engine, new \Visconsin; generator newly wound on Dodge 12 v. Mivers, transmitters, kits, parts. You get best terms (financed fraine. Ready to run - requires one 6-valt fitorage battery. by myself); largest trade-in; personal eooperation: lowest Complete with automatic governor,_ muffler and meter _panel; prices; prompt shipment from world's largest, stock amateur fully shielded and filtered. Net wt. 252 lbs - $169. A. Gilbert receivers and parts. Immediate shipment NC-200 and aJ1 makes Moore, WlLPJ, Sharon, Mass. and models receivers. Let's get acquainted. Write us for any BRIDGE Universal a.c. RCA type TMV-132-A, DuMont fre thing. Henry Radio Shop, Butler, Mo. quency modulator type 151. QSTs November 1929 to Decem NEW Mac $7.50 bugs $4.50 on approval. Special price.s on sev ber 1940, all or part. Make offer. W2DRK. e.ral makes amateur receivers. Code machines rented, A.O. or NEW F;ngland Division A.11..R.L. convention, Boston Ham spring wound. Lowest and best rates. Write. W9ARA, Butler, fest, Hotel Hradford, Boston, October 18. Mo. CRYSTAL-swap Hamads should use the following standard RECONDITIONED guaranteed amateur receivers and trans form. Simply say: the frequency of your crystal, its make and mitters, All makes and models cheap. Ji'ree trial. Terma. List free. t,ype. the frf!quency (or betw~;n what frequencies) you want, Write. W9ARA, Butler, Mo. your call. For instance: 1890 Billey LD2 -1817-1823. WlKH. NEW England Division A.R.R.L. Convention, Boston Ham means WlKH has an 1890 kc. Bliley type LD2 he wants to fest, Hotel Bradford, Boston, October 18. swap for some crystal between 1817 and 1823, For so long as QSL'S? - SWL'S? -1:lliley crystals? Patronize the ham. there is considerable demand for crystal-swap Hamada, this Samples? W8DED, Holland, Mich. explanation will appear each month. 107 g11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111_111111111111111111111111111111111111111111111111111~ I Jk &ditL ,.,._,__ I I HANDBOOK I I T~:ed:;7~s~::;~~e:~:e t~~:~rs=~~~~g •: I I [~;~iii:1:::~~;:~;~\:~~:t~t~i~s:::i~ I I :~~;\;f~~\\{~~:it~:~~~i:::lif.~~il~ I ! :!~:;si:h~~:~:u:n:a~~:.best information on every- I ; $1 PoSypAID ! $1.50 Outside Continental U. S. A. Buckram Bound $2.50 Postpaid Spanish Edition $1 .50 Postpaid AMERICAN RADIO RELAY LEAGUE, WEST HARTFORD, CONN. 108. Your Nearby Dealer Is Your Best Friend Your nearby dealer is entitled to your patronage. He is equipped with a knowledge and understanding of amateur radio. He is your logical source of advice and counsel on what equipment you should buy. His stock is complete. He can supply your needs without delay. His prices are fair and consistent with the high quality of the goods he carries. He is responsible to you and interested in you. One of these dealers is probably in your city- Patronize him! ATLANTA, GEORGIA HOUSTON, TEXAS Radio Wire Television Inc; R. C. & L. F. Hall 265 Peachtree Street 1021 Caroline Street (C 0721) "The World', Lorgest R•dio Supply House"" "Specialists in Arnateur Supp\ies" BALTIMORE, MARYLAND NEWARK, N. J. Radio Electric Service Co. Radio Wire Television Inc. 3 N. Howard St. 24 Central Avenue Everything for the Amateur "The World's Largest Radio Supply House" BOSTON, MASS. NEW YORK, N. Y. Radio Wire Television Inc. Radio Wire Television Inc. 110 Federal Street 100 Sixth Avenue "The World's l•rgest R•dio Supply House" "The World's largest Radio Supply House" BUFFALO, NEW YORK NEW YORK, N. Y. Radio Equipment Corp. Harrison Radio Company 326 Elm Street 12 West Broadway WBPMC and WBNEL --- Hom service and sound equipment Harrison Hos It! Phone WOrth 2-627 6 for information or rush service BUFFALO, NEW YORK PHILADELPHIA,PENNSYLVANIA Dymac, Inc. Eugene G. Wile 1531 Main Street - Cor. Ferry 10 S. Tenth Street One of the largest Ham Supply Houses in Western New York GA. 0252 Complete Stock of Ouolity Merchandise HARTFORD, CONNECTICUT PROVIDENCE,RHODE ISLAND Radio Inspection Service Company W. H. Edwards Company 227 Asylum Street 85 Broadway What do you want"? We have it. Radio exclusively National, Hammarlund, Hallicrafter, Thordarson, Taylor, RCA HARTFORD, CONNECTICUT SCRANTON,PENNSYLVANIA Ha try & Young, Inc. Scranton Radio & Television Supply Co. 203 Ann Street 519--521 Mulberry Street Stores also in Bridgeport and New Haven Complete Stock of Ouality Amoteur Supplies 109 Index to .Advertisers PAGE: Abbott Instrument, Inc.. • • ...... • • • . • . 97 ~i\.erovox Corporation...... • . . . . • • • • . • . 98 American Lava Corporation ..• , . . . . . • . . • • • • . • . . . . 75 American Radio Institute. , , ...... • . . . . 99 WHEN YOU BUY ...... FRO][ Astatic Corporation, The ...... ,,,...... 81 Ayers, N. C...... 98 Billey Electric Company, , , , ...... • ...... • . . 7 4 Candler System Company, .....•.. , ... , , .. , . .. • . • 86 Capitol Radio Engineering- Institute. . • • • • • . . • . • . . • 94 Cardwell Mf~. Corp., Allen D...... 72 Q&J Centralab...... • .. • ...... S Clarostat Mfg. Company ..•..•....••••••..... ; • . • 90 Collins Radio Company .••....•...•.• ..- •••.•.••.• Cov. 2 Commercial Radio Institute. . . . . • . • . . . • ...... • . • • 9.8 ADVERTlS.ERS l)odge's Institute. • . • . . • • . • • • . • . . . . • . . • • . . . . . • • . 82 F.chophone Radio Company. . . . . • . • • ...... • 106 Eitel-McCullough, Inc.. . . . • ...... 79 Gardiner-Levering Company. . . . • • • • • . . • . . . . . • • . . 94 General Electric Company ..... , . . . . . • • • . . . . . • . . . 73 Hallicraftern Company, The...... • . • 1, 2 Hammarlund Mfg. Company, Inc.•...... 69, 71 .-J "Advertising for QST is Harrison Radio Company. • • . . . . . • • • . . . . • . . . . • • • • 105 Harvey Radio Company ...... , . • • . . • • • 104 Henry Radio Shop...... 111 'L accepted only from firms Hipower Crystal Company .... , . • ...... • . 97 Instrnctograph Company .... , , ...... , ..... , , , , , , 97 who, in the publisher's opin [nternational Resistance Company. • . • • ...... • . • . • 95 ion, are of established in Johnson Company, E. F...... 8.3 Kenyon Transformer Company, Inc •..•.....•••.• , 99 tegrity and whose products Mallory & Company, Inc., P. R...... , , .... , 68 Massachusetts Radio School. ..•.•••.• , . . . • . • • . . • • 98 secure the approval of the Meissner Mfil, Company. . • . • . . • ...... • . . • . . . . . • • • 77 Midland Radio & Television Schools, Inc.. . . . • . . . . . 102 technical staff of the Ameri Millen Mfg. Company, Inc., James .•.•.•.•..•.•... Insert National Company, Inc...... Cov.J,67 New York YMCA Schools. Inc...... 99 can Radio Relay League." Newark Electric Company...... • . . 91 Nilson Radio School ...... •...... •.•...... •. 80, 99 Ohmite Mfg, Company ...... - • ., • ...... • .. 76 <)uoted from QST's advmising rate card. l 'etersen Radio Company ••..•...... •. , , . . . . . 94 Port Arthur Colle&e, , , ... , ...... • . • ...... • .. • 80 Precision Apparatus Company. • • . . • • • ...... • • 99 RCA Institutes, Inc...... • ...... 99 RCA Mfg. Company, lnc....•...... •...... •.. Cov. 4 Radio City Products Company, Inc.. • • • • . . . . • • • . • • • 90 Radio Control Headquarters, Inc.. . . . • • . • . • . . . . . • . 97 Every conceimble need o.f Radio Shack, The ...... 84, 85 a radio amateur can be Shure Brothers .•.... , • ...... • .. . . • ...... • 86 ~ickles Company, F. W...... 98 supplied by the adl'ertis Solar Mfg. Corporation. • ...... • ...... • .. • 94 Standard Radio Parts Company...... • • • . . . . • • . . • • 100 Standard Transformer Corp...... • . • . • • 78 ers in QST. And you will Sun Radio Company •...... •.•.• , ...... , • 100 know the product has the 'I'aylor ·rubes, Inc...... • . • • ...... • . • . • . . . . . • 87 Telep!ex Company. . . • ...... • . . . . . • . . . . . • ...... 102 approml of the League's Terminal Radio Corp...... • . . . • . . . • • . . • • 96 Thordarson Electric Mfg. Company...... • ...... 70 technical sta.ff Triplett Elec. Instr. Company, Inc .... , ...... , . . 82 United Transformer Corp ... , . • • ...... • . . • . . • . • 112 Wholesale Radio Laboratorie.s ....•• ~...... • 101 DO YOU \VANT A BETTER RECEIVER? If you do, we should get acqua~ted. I'm Bob Henry, W9ARA, at Butler, Missouri in the "Heart of Amerwa" where I can serve all the USA easily and quickly. I sell more amateur receivers than anyone else in the world, because I really make it to your advantage to buy from me. I have the big gest stock of all mak~s a~d models. I personally cooperate with you to help you get the best receivey for your use ai_id to see th,:it you are 100% satisfied. I will give you a trade-in on your rece1ver that will make your eyes pop. I finance all terms myself so I can give you a better break ( write me for proof that xny terms are the best of all). I ship everything on a ten-day free trial. Drop me a line. Tell me what you want; what you have to trade-in· what terms you want arranged. ·we can help each other. ' Let's get acquainted ~'!!~ RENllY RADIO SHOP BUTLER, MISSOURI 111 ------·------.•••::cm••.,•.c•.m,•:•.w:,• .. •.,•:,,:•:•:,-.•,••• .. ::.. ;,_.)!)i#'!,t,,;n,::,,",'""/.",","•·:•:\;,','.:: 'Y"CvoEiA',·c;,,,= REG u LA r o Rs,,, •. 110~ ···115, 120 VOLTS OUTPUT + 1o/o '.; -·: .. -- ... .-:-:··_:-:-.-:: 0 - ' 8 U'fC automati6 ~61tagJ regulator is NEW. It involves no moving parts and ects instantaneous correction for either transient or chronic line voltage fluctuations. STANDARD TYPES SPECIAL UNITS Copocity Net Designs for 220 volt The unique design of these regul~:c':'J: VA - 60 Cc. Pric. sarvlce ·available at tors makes possible the construction of'> 15 .oo 2-S &/. increase_ in special units with relative ease. T~e')i 30 15.00 price, for 50 i,yc:le output can be arrcrnged to proviql'i';J so 21.00 units increase price filament and plate voltage, or an"2''f 120 28.00 25 '/4.: for 42 cYcles.. other special voltages that may be res;,}i 250 46,00 35 % ina-ease; for 25 quired. Write for details. soo 67.00 cycles. increa11e price 1000 !J0.00 100'7.. Special sec- 2000 200.00 0,ndary voltages «vallcible tr, cua. lomera' specilica!ions «t small increase in ••••••••••••••• price. 150 VARICK STREET N ~ W · Y O R K, 'N. Y . ' • . • • • f • . . 112 QST for October, 1941, EASTERN EDITION PRINTED IN U. S, A, RUMP'ORD PRESS C::ONCOAD. N. H, THE· NEW 1942 CATALOGUE Better get your copy of the new National 1942 Catalogue. It shows the 5-B-100 Tank which tunes through five amateur bands without plug-in coils. It uses variable in ductances as well as a variable condenser, so that the L/C ratio remains at the correct value for all frequencies, in spite of the wide range. It is a convenient, compact and eco nomical solution to your tank circuit pro.blems. You will find other new products you will like, such as the AO and AL Dials and the little MS Condenser. You will find old friends in new dress, like the revamped NSA Am plifier. And last but not least, you will find· the NC-45 Receiver which is new to the Cata logue, if not new to QST's re~ders. .. lJp-to-the-Minute ! RCA: iiJBE \PtJBtICAT and ENGi "''3••••K·•NG DA A These RCA publications bi;Jniyou th,.e publications keep you fully abreast of modern tube engineering help you need-whe.n::,·· . and design and application. They are available through in its most authentic and up-to RCA GUIDE FOR TT-100 TRAN!;~ITTING RCA HAM TIPS RCA PHOTOTUBE BOOKLE1 TRANSMITTING TUBES TUBE BOOK'i.ET RCA' s newsy little publica Written by RCA engineers tc Full details on RCA air-cooled This attractively illustrated 16· tion devoted exclusivelr to give a clear understanding o transmitting tubes; circuits and page booklet shows at a glance the amateur. Jam-ful of phototube theory, construe construction data of interest to ex the maximum ratings and typ how - to - make- it articles, tion, and operation. Complet, perimenters, amateurs, and engi• ical operationconditionsofthe technical data, transmitting with descdptive text, circuits neers. 5 0% larger. Fully illustrated. entirelineofRCA Transmitting tube advice, helpful hints. curves, and charted informa 72 pages. Net Price, 25c. and Special-Purpose Tubes. Issued seven or eight times tion.Bookletcontains 16 pages ayear. Ask your distributor Single copies at no charge Single _copies at no charge JO supply you with it. Available at no charge '~ 90700 39006 39002.