'I--,, . ~ , • •c'/4 • / ,,< ' / =~ .-« f .,, ...- "~•o ~- ... (.-.. ·,~ ~ -+--~ r •. , , ''HAMMARLUND OMETIMES, even the most careful means amateur is tempted .to "economize" on Shis equipment - and often to his sor­ row. For experience has definitely proved Quality! that results in radio cannot be superior to the parts used in construction. Since the early pioneer days, "HAMMAR­ LUND" has meant QUALITY! But it has never meant high price. Bear that in mind when next you need con- · densers, coils, transformers, chokes, shields and sockets. • At the right are illustrated two exceptional new Hammarlund Chokes. A midget R.F. Choke, wound on lsolantite core. Inductance 2.1 mh. D. C. resistance 35 ohms. Distributed capacity 1 mmf. And a heavy duty Transmitter Choke which has more than 500,000 ohms of impedance at the 20, 40, 80 and 160 meter amateur bands. lsolantite core. Inductance 2.5 mh. D. C. resistance 8 ohms. Distributed ca­ pacity less than 1.5 mmf. Mail Coupon for Details :~..------.... HAMMARLUND MANUFACTURING CO. 424-438 W.l33rd1St., New York -:Check here for General Catalog "34" of condensen and other precision tadio eciulpment. - Check here for I~ 'Jo'!., &tWt, futdllY booklet describing the famous COMET "PRO" 8 to 550 meter Superheterodvne Receiver. ,f"lamm~rtund Name ...................................•..•...... Ill PRODUCTS Ill Address ...•...........•.... ,., ................... •• ............................................ Q-7 Sr.y You Saw It in QST- It Identifiea You and Helpa QST i 1 It takes GOOD INSTRUMENTS to Chase the Bugs Out I I HEN your last stage won't shut up Since 1888, Westinghouse engineers W with the key open; when parasitics have been designing instruments, and heat your coils but leave the ether un­ they have put their whole bag of tricks rutlled; when you can't load the buffer in the MX and NX line ••• c:ertainly with link coupiing; ~hen the single-wire as high a grade of instruments in their feeder blossoms out with standing waves; size as was ever offered. when you run tto any of the ills that keep A new folder, F. 8338, takes an NX you from goin T WAC ... you need good instrument all apart-shows how it op­ instruments • I. and you can't begin to erates and why. Every individual piece tell where your trouble lies without them. that makes up the instrument is illustrated It isn't enough to buy an instrument of and its purpose and method of manu­ the proper size and rating. There are as facture are given. In addition, the usual many ways of making an instrument as forms of construction are described. there are of hooking up an oscillator. The You'll find complete and precise in­ main parts of an instrument are few, but formation in this new folder. to make them properly, and to assemble SEND FOR INFORMATION them to give high accuracy . and to Westinghouse Electric &,Manufacturing Company retain it ... requires skilled engineering Dept. 132, Room 2-N .East Pittsburgh, Pa. j and painstaking manufacture. Gentlemen: Please send the booklets checked below: F. 8338-What's Behind the Dial Catalog 43-340-Types MX and NX Instruments Catalog 43-341-Type NX Universal Rectox Instruments Catalog 43-342-Type NX Multi-Range R. F. Ammeter Westinghouse Name ............................................... .. Address .............................................. Quality workmanship (W"\ City ............................................ T 85059 guarantees every Westinghouse product 'eJ State ......................... • Call........... QST 7-34 2 Say You Saw It in QST- It ldentifiea You and Helpa QST D!il Published monthly, as its official organ, by the Amer­ ican Radio Relay League, Inc., at West Hartford, devoted entirely to Conn., U.S. A.; Official Organ of the Internation­ al Amateur Radio Union AMATEUR RADIO Editorials . 7 Mas~achusetts State Convention (Announcement) 8 Iowa State Convention (Report) 8 28-Mc. Tests . 8 Automatic DX Relay Work for the Ham . D. A. Griffin, W2AOE 9 First Boston-New York 56-Mc. Relay. T. F. Cushing, WlHMO 14 A Vacuum-Tube Type Modulation Meter E. and C. Seiler, WBPK 15 \Vhat the League Is Doing . 18 Progress on 28 Mc. 21 A Modern Transportable Station Harvel Baker, 1177ALH 23 A Relay Rack for Two Dollars. J.M. Carstarphen, Jr., 1174,CCH 25 Typical Technical Questions Answered 26 Hamdom . 28 Ham Radio in Japan W. S. Upson 29 The Incandescent Lamp As a Resistor F. Hamburger, Jr., W3AAM 31 A 14-Mc. Rotary Beam Antenna . John P. Shanklin, W3CIJ 32 Amateur Radio Stations . W6ITH, W9FAT', W2ESK, WBWT i\5 For the Experimenter: PLATE MODULATION WITH TAPPED CHOKE --TRANSFORMER• • LESS A. C. ·---- OPERATED MICROPHONE AMPLIFIER----- THE TWISTED-PAIR-FEEDER TRANSMITTING ANTENNA F'0R RE­ CEIVING ·------ ON TRANSMITTER "C" BIAS SUPPLIES -- THE ABSORPTION CONDENSER MICROPHONE - MAGNETS F'0R THE VELOCITY MICROPHONE 37 ~W1a•eu1MM' L~aufu-. ~ Communications Department 42 Correspondence 56 Silent Keys 66 Hamads 74 QST's Index of Advertisers 78 Kenneth B. Warner (Secretary, A.R.R.L.), Editor-in-Chief and Business ~tan­ ager; Ross A. Hull, Associate Editor; Jam.es J. Lamb, Technical Editor; George .JULY G,rammer, Assistant 1'echnical Editor; Clark C. Rodimon, .Jifanaging Editor; David H. Houghton, Circulation Manager; I<'. Cheyney Beekley, Aduertising Manager; Ursula M. Chamberlain, Assistant Advertising Manager. Editorial and Advertising Offices 1934 38 La Salle Road, West Hartford, Conn. Subscription rate In United States and Possessions and Canada, $2.50 per year, postpaid; all other countries, $3.00 per year, postpaid. Single copies, 25 cents. F'oreign remittances should be by International postal or express money order or bank dra!t negotiable In the U. s. and !or • an equivalent amount In U. 8. !unds. FJntered as second-class matter May 29, 1919, at tbe post office at Hartford, Connecticut, VOLUME XVIII under the Act o! March 3, 1879. Acceptance !or malllng at special rate or postage provided for 88 NUMBER 7 In {J~~~o~?~._Ai£~. 'tu&°;~ia i1eii~ryait~1~~r Jl;J'Jtfh~ei~t ~f¥eb~ct,.~l~~~\~f~~y at Copyright 1934 by the American Radio Relay League, Inc. Title registered at United States Patent Office. It Is the Radio Amateur's Number One Piece of Equip­ ment ,---J. order your copy today the eleventh edition RADIO AMATEUR•s HANDBOOK The new eleventh edition of the Radio Amateur's Handbook is a complete revision and enlargement from the previous edition. It is the standard of the world as the textbook of Amateur Radio. Its 260 pages and 224 illustrations are a complete education in the technique and practices which have been developed through the years-right up to now. THE MOST COMPLETE BOOK ON AMATEUR RADIO EVER PRINTED Price $1 postpaid anywhere (in buckram binding, $2) . THE AMERICAN- RADIO RELA y LEAGUEI INC. ..ij West Hartford, Connecticut 4 Say You Saw It in QST - It Identifies You and Helps QST Section Communications Managers of the A.R.R.L. Communications Department All appointments in the League's field organization are made by the proper S.C.M., elected by members in each Section listed. Mail your S.C.M. (on the 16th of each month) a postal covering your radio activities for the previous 30 days. Tell him your DX, plans for experimenting, results in 'phone and traffic. He Is interested, whether you are an A.R.R.L. member or get your QSTat the newsstands; he wants a report from every active ham. If interested and qualified for O.R.S., O.P.S. or other appointments he can tell you about them, too. ATLANTIC DIVISION Eastern Pennsylvania W3GS Jack Wagenseller 24 South Fairview Ave. Highland Park, Maryland-Delaware-District Upper Darby of Columbia W3BAK Ed,iar L. Hudson Laurel, Delaware Southern New Jersey 412 2nd Ave. Haddon Heights W•-•tern New York ~~B~p g~n}~~~\Jor 213 Hickok Ave. Syracuse Western Pennsylvania W8CUG C. H. Grossarth R. F. D. 3, Eicher Rd. Emsworth, Bellevue, CENTRAL DIVISION Pa. Illinois W9WR Fred J. Hinds 6618 West 34th St. Berwyn Indiana W9TE Arthur L. Braun 911 Reisner St. Indianapolis Kentucky W9OX Carl L. Pllumm P. 0. Box359 Louisville Michigan W8DYH Kenneth F. Conroy 7538 E. Robinwood Ave. Detroit Ohio W8BAH Harry A. Tummonds 2073 West 85th St, Cleveland Wisconsin W9FSS Harold H. Kurth 2550 N. 8th St. Milwaukee DAKOTA DIVISION North Dakota W9JVP Fred J. Wells 1022 11th St., S. Fargo South Dakota W9PFI Mike G. Strahon 601 S~ Grange Ave. Siour Falls Nor them Minnesota Robert C. Harshberger 1200 Fauguier St. bt. Paui Southern Mmnesota ~UNfI Francis C. Kramer W. Bluff St. St. Charles DELTA DIVISION Arkansas H.E. Velte 2918 West 15th St. Little Rock Louisiana ~H;!nson, Jr. 1624 Allen Ave. Shreveport Mississippi* ~: f;, P.O. Box 66 Jackson Tennessee F. F. Purdy P.O. Box 173 .Kingsport HUDSON DIVISION Eastern New York W2LU Robert E. Haight 1080 Helderberg Ave. Schenectady N. Y, C. & Long Island W2AZV E. L. Baunach 7823 10th Ave. Brooklyn Northern New Jersey* W2BPY Robert Maloney 315 Watson Ave. Perth Amboy MIDWEST DIVISION Iowa* W9CWG E.F.Alberts - 210 Exchange St. Keokuk Kansas W9FLG O. J. Spetter ,lOS Western Ave. Topeka Missouri W9EYC~JPT C. R. Cannady ,JOO Sixth St. Monett Nebraska W9FAM Samuel C. Wallace Green St. Clarks NEW ENGLAND DIVISION Connecticut W!CTI Frederick Ells, Jr. 19 Merrill Rd. Norwalk Maine WICDX John W, liingleton l.O High Street Wilton Eastern Massachusetts W!ASI Joseph A. Mullen 16 'Mercier Ave. Ashmont \Vestern Massachusetts W!ASY-WlRB Earl G. Hewinson ;l3 Cortland St. Springfield New Hampshire W1APK Basil Cutting Pembroke Rhode Island W1QR Albert J. King 66 Lisbon St, Providence Vermont W1ATF Harry Page R. 1 Hinesburg NORTffiVESTERN DIVISION Alaska Richard J. Fox Box 301 Ketchikan Idaho Wl'i?.,p !Jon lJ. Uberbillig P. O. Box 1271 Boise Montana W7AAT O.