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$I]RPTI]$ CONIITB$Ioil $I]RPTI]$BAilI CONIITB$IOil VOTUMENo. I Third Edition By R. C. EVENSONAND O. R. BEACH . CONf ENÎS - BC-22I Frcqucaty llArtrr SCR-274({57A Scrlar) Tronrmillerc BC-342 Rcccivcr SCR.522 Tro nsmitlcr/Rcceivcr lC.3l2 Rcccivcr TBYlronscaiver BC.348 Rcceivcr PE.l03A Dynomofor BC{l 2 Rodqr Orcillorcopc BC-t0ó8A/l tótA Receiver BC-ó45Tro nrmilîcr/Rccclvcr EleclronicsSurplus Index BC-9,1óReceivsr Cross Index of A/N Vacuun Tubec SCR-274(4534 Serier) Rccrivcn PREFACE Since the beginning of the "surplus eratr a real need has existed for a publication devoted entirely to the conversion information necessary to permit practical use of surplus equipment. The amateur radio operator has had especiar need for such a pubrication. The authors have endeavored to fulfil that need in the fo'owing pages by compiling the necessary in- structions and diagrams for the practical conversion of a number of the most popular items of surplus equipment. Theory of circuit operation has not been incruded in this manuar so that conversion data on the largest number of equipments could be in- cluded. It has been assumed that those persons interested in a manuar of this nature are generarly familiar with the operation of erectronic equip_ ment. It should be noted thatthe operation of any radio transmitting equip_ ment, including that described herein, requires the issuance of both an operator's license and a station license by the Federal communications Commission. Th-eauthors regret that time does not permit them to engage in individuar correspondence regarding these or other surplus items, and the publisher has been requeste-anot to forward retters. We have no information on surplus items other than those in these several Manuals $3.50 Cot.No. EE-31 I SURPLUS RADIO CONVER,SIONMANUAL VOLUME I Third Edition by R. C. Evenson and O. R. Beach Published qnd distributed lo the electronicsirode by New Augusto,Indiono copyright 1948by Techno-GraphicPubtications. Printed ln u.s.A. TABLE OF CONTENTS Subject Page BC-22L FrequencyMeter (SCR-211) c BC -342 Receiver L2 BC-312 Receiver 22 BC-348/224 Receiver 29 BC-412 Radar Oscilloscope (to TV Receiver and Test Oscilloscope) 40 BC-645 Transmitter/Receiver (420 Mc.) 53 BC-9468 Receiver (Conversion to Auto Receiver). BC-453-4-5 scR-274N Receivers (Conversionto 10 Meters) ?3 ARC-5 BC-45?-8 -9 BC-696 SCR-2?4N Transmitters (Conversion to VFO) 19 ARC-5 BC-625 Transmitters (scR- 522/542) (2 Meters) 82 BC-624 Receiver (SCR-522/b42)(2 Meters) . TBY Transceiver (6 and 10 Meters) PE-103A Dynamotor 104 BC-1068A Receiver (SCR-268/2?1 BC-1161A Radar) (2 Meters) 106 Electronic Surplus Index 111 Index of A,/N-'\,IT" Tubes vs. Commercial Types 122 SCR-211FREQUENCY METER SET (Bc-221) The SCR-211Frequency Meter Set consists of several minor compo- nents and the major component,the BC-221 Frequencymeter. It is de- signedto radiate or measure radio frequenciesbetween 125 kc. and 20,000 kc. This frequency measuring device is a precision instrument and is capable of making frequency measurements to a high degree of accuracy. It should be noted that no conversion of this unit is required for nor- mal use unless it is desired to use an a-c power supply in the place of the required batteries. If the a-c power supply is desired, reference is made to fig. 3 which is self-explanatory. Since this article is of a descriptive nature, pertaining to the operation and use of the BC-22L, the discussion will be made under the following sections: (a) General Description (b) Principles of Operation (c) General Use of the Instrument (a) General Description There are mÍrnymodels of the SCR-211 FrequencyMeter Set, which include the SCR-211-A,B, C, D, E, F, L K, L, M, N, O, P, Qr R, T, AA, AC, AE, AF, AG, AH, AJ, AK, andAL. Even though many of the models are quite similar, there are numerous minor changes. These changes are too numerous to mention in the scope of this article; however the discussioncovers the general operation and characteristics which pertain to all models. All models of the SCR-211consist of the following components: 1 ea. Calibration Boo\ MC-177 1 ea. Crystal Unit, DC-9 Set of vacuum tubes, installed Set of batteries, 6 ea. BA-2 ("8" Batteries) 4 ea. BA-23 ("A" Batteries) Headset and Cord (applicable type) There are two typesof cases that enclosethe BC-221, the woodentype and the aluminum alloy type. The dimensions of the aluminum case are Lz-L/2" high,10" wide, and 9-tf4" deep;thewooden case is slightly larger. The self-contained battery compartment is designed to hotd 6 BA-2 batteries (22-L/2 volts each) and 4 BA-23 batteries (L-l/z volts each). "B" This gives the required supply voltage of 135 volts and 6 volts for the 'h" supply. (Note: minimum voltages for satisfactory operation are 5.4 "A" "B" volts and 121.5volts for the and supply respectiveiy.) Six different control panel designs appear in the BC-221's varying with the different models and the different manufacturers. This variation is not important since the control labeling and the included unit instruc- ti.onsmake the operation self-explanatory. -5- Each BC-221 unit contains an individua[y calibrated book, Mc-1??, permanently attached to the front panel cover. (b) Principles of Operation The BC-221 is a heterodynetype of frequencymeter employinga 1000 kc. crystal oscillator which furnishes 1000kc. check points for the vari- able frequency oscillator. Manual tuning of the variable frequency oscil- lator is brought out on the control panet with its associated dials. Two calibration ranges are provided, the 125-250kc. range and the 2000-4000kc. range. By use of the 2nd,, 4th, and Bth harmonics, the low frequency range covers 250 to 2000 kc. By use of the 2nd, 4th, and bth harmonics, the high frequencyrange covers 4000to 20,000kc. ANTENNA DETECTOR AUDIO AMPLIFI ER to00Kc. XTAL OSC. with reference to the block diagram of the Bc-zzl, the output of the v.f.o. is heterodynedwith the incoming signal from the antenna. After detection the beat frequency is amplified by the audio amplifier and its output connectedto headphones. when the beat frequency reaches the audible range it is heard in the headphonesand the final tuning "zero-beat". adjustment is made with the v.f.o. to pro- duce a This indicates the incoming frequency and the dial reading is taken. The abovedescription of operation refers to an incoming signal such as checking a transmitter. since the Bc-zzl also radiates its v.f.o. sig- nà\ receiver calibration and checks are made similarly by the "zero-beat" method as heard in the receiver output. From the following factors: mechanical shocks, locking action of dial, warming up, changeof load at antenna, 10 per cent changein battery voltage, error in calibration,and error in crystal frequency,the maximum error should not exceed .034 per cent at 4000 kc. Normally the errors tend to ,cancel each other so that the normal error shouid not exceed .02 per cent. -6- (c) General Use of the Instrument Reading the frequency meter dial consists of three individual steps. first tùo digits ire read on the hundreds dial (drum dial). From the The "units", large circular dial, labeled th.e second two digits are read. The u"""ni"" scale (Iocated on circular dial) provides the fractional digit in the conventional manper. Thus the following example reading can be obtained: 45 B? . 5. This dial reading is then checked in the calibration book to obtain the frequency of the signal being measured. For transmitter frequency measutements, a 2-foot piece of rigid copper wire is adequate for the frequency meter antenna. The antenna "n*ta be only in réasonable proximity to the transmitter output. Care should be exeicised to avoid allowing excess r-f to enter the frequency meter which can cause permanent damage. In making frequency checks or dial calibrations with a receiver, the frequency méter antenna lead should be only loosely coupled to the re- ceiver input. This can be close proximity or the wrapping of the respec- tive leads. At no time should the frequency meter be directly connected for fre- quency- measurement PurPoses. In all models of ttre Bc-221, high impedance headphones should be P-18 used for optimum performance. The earlier models specified the and the n-ig treadphoneswhile the later models specified the HS-30. A point wortiiy of mention is that in certain measurements where "zero-beat" visual observation of the is desired, an output meter with an appropriateimpedancematchingdevicecanbeusedinplaceofthehead- phones. -7- It o z ,Epg!É f6o'-> d<7eee ro ro È=UqU lf- ts ?63Èà5 =f{5 o à6 F F 9s 'È E: :sigx;x; .ón s I o{r.ì€N6òO NNdNNNqC' I 3t gg I f)o ; Ì; :sp==rÉÈ e@* :gòiÉHF3(J N 3 à I @ è l\ @ Èt- lF- h I I 0 È n lìì:.ìa:.. (9 E;;;Eq3! tt I g(9 =? @ ct H. tto () o o o J uor93uuoc ts -8- o t JU <F F<f 3t\ oc9 35t5 a @ *3 lttl o-No I N o^ z u z E F è o ; d I c - ò ,i z N I '3 J 'ì t a:=:Í-=t 9x sÉ6É::E \ I; io { :A! ---: -óu o- :-- ìi3' 3? 8r E9 -9- REGULATED POWER SUPPLY FOR THE BC.22T Figure 3 shows an easily constructed voltage-regulated power supply for operation of the BC-221 frequency meter.
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