BC-1335_serv_user_TM11-879_1945.pdf

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BC-1335_serv_user_TM11-879_1945.pdf

WAR DEPARTMENT TECHNICAL MANUAL b :b I y f!J :y llfll 0 ! l.borotory . - o.;ll! ., RECEIVER- - TRANSMITTER BC-1335 h United States Govern- . he property of t e of the military, H ftMG: Tis monu;ldsst:ibuted solely for :evseportments, ond nt ond is pnnted on I of the War and a . . port or in anY me , .,. personne hoe ol , d I and civr ron duced in w oy repro uce nova . h d or repro h delS who m not be publrs e ful copyright o I ss specifrcaiiY may orm (except by law . ri ina form) un e manner or . hted material in rts elations agencies. their copyrrg . d military pci:Jrc -4 d by outhorrze 1 , approve WAR DEPARTMENT 23 APRIL I945 -=o- WAR DEPARTMENT TECHNICAL MANUAL TM 11-879 RECEIVER- , TRANSMITTER BC-1335 WAR D EPA R ,T MEN T 23 APRIL 1945 WARNING: This manual is the property of the United States Government, and is printed and distributed solely for the use of the military, naval, and civilian personnel of the War and Navy Depart- ments, and may not be published or reproduced in whole or in part, or in any manner or form (except by lawful copyright holders who may reproduce their copyrighted material in its original form) unless specifi. cally approved by authorized military public relations agencies. WAR DEPARTMENT, WASHINGTON 25, D.C., 23 APRIL 1945. TM 11-879, Receiver-Transmitter BC-1335, is publish. ed for the information and guidance of all concerned. A.G. 300.7 (21 Dec 44).) By ORDER OF THE SECRETARY OF WAR: G. C. MARSHALL, Chief of Staff. OFFICIAL: J. A. ULIO, Major General, The Adjutant General. DISTRIBUTION: II AAF(5); AGF(5); ASF(2); Tof Opn(5); Dept(5); Def Comd (2); Base Comd(5); AAF Comd(2); Arm S Div ASF(1); Tech Sv(2); Sv C(5); Area A Sv C(2); WDGS Lib (5); PC PE (2); Dep 11 (2); Gen Overseas SOS Dep (Sig Sec) (2); GH(2); M Cone C(2); Air Base Hosp(2); Gen Sv Sch(5); Sp Sv Sch(10); USMA(2); ROTC(5); Lab 11(2); Sig AS(2); Rep Shop 11(2); A(5); D(2); AF(2). T/ 0 3-27(3); 6-10-1(3); 6-12(3); 6-20-1(3); 6-26(3); 6-27(3); 6-29(3); 6-36(3); 6-37(3); 6-39(3); 6-50-1(3); 6-56(3); 6-57(3); 6-59(3); 6-67(3); 6-77(3); 6-78S(3); 6-97 (3); 6-127(3); 6-129(3); 6-157(3); 6-176(3); 6-177(3); 6-200-1(3); 6-216(3); 6-217(3); 6-218(3); 6-226(3); 6-227 (3); 6-270-IT(3); 6-327(3); 6-329(3); 6-337(3); 6-339(3); 6-357(3); 6-359(3); 6-367(3); 6-397(3); 11-7(3); 11-107(3); 11-127(3); 11-237(3); 11-557(3); 11-587(3); 11-592(3); 11- 597(3); 18-25(3); 18-26(3); 18-28(3); 18-35(3); 18-36(3); 18-37(3); 44-276(3); 44-277(3); 44-278(3). (For explanation of symbols see FM 21-6.) TABLE OF CONTENTS Paragraph Page PART ONE. Introduction. Section I. Description of Receiver-Transmitter BC-1335. General . . . . . . . 1 1 Application. . . . . . . . . . . . . . . . . . . . 2 4 Technical characteristics . . . . . . . . . . 3 4 Communication with other radio sets. . 4 5 Table of components. . . . . . . . . . . . . 5 6 Shipping weights and dimensions of packed sets. . . . . . . . . . . . . . . . . . . 6 8 Description of components. . . . . . . . 7 9 II. Installation of Receiver-Transmitter BC-1335. Unpacking, uncrating, and checking 8 10 Connections and interconnections . . 9 11 Installation. . . . . . . . . . . . . . . . . . . . . 10 12 Repacking. . . . . . . . . . . . . . . . . . . . . . . 11 12 PART TWO. Operating instructions. Section III. Controls and their use. Controls and their use. . . . . . . . . . . . 12 13 IV. Operation. Starting procedure. . . . . . . . . . . . . . . 13 17 Precise operating instructions. . . . . . 14 17 Stopping procedure. . . . . . . . . . . . . . . 15 18 V. Equipment performance check list. Purpose and use of check list . . . . . . 16 18 Equipment performance check list. . 17 20 PART THREE. Maintenance instructions. Section VI. Preventive maintenance techniques. Meaning of preventive maintenance 18 22 III IV TABLE OF CONTENTS Paragraph Page Description of preventive mainte- nance techniques. . . . . . . . . . . . . . . 19 22 Vacuum tubes. . . . . . . . . . . . . . . . . . 20 24 Capacitors. . . . . . . . . . . . . . . . . . . . . . 21 25 Resistors. . . . . . . . . . . . . . . . . . . . . . . . 22 25 Fuses. 23 26 Bushings and insulators. . . . . . . . . . . 24 27 Switches . . . . . . . . . . . . . . . . . . . . . . . . 25 28 Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 28 Potentiometers. . . . . . . . . . . . . . . . . . . 27 28 Terminal blocks . _ . . . . . . . . . . . . 28 29 Multiple connectors . . . . . . . . . . . . . . 29 29 Cords and cables. . . . . . . . . . . . . . . . . 30 29 Jacks and plugs. . . . . . . . . . . . . . . . . . 31 30 Cabinet, chassis, and mountings. . . . 32 30 Headset and microphone. . . . . . . . . . 33 30 Coupling shafts and control knobs. 34 31 Section VII. Itemized preventive maintenance. Introduction. . . . . . . . . . . . . . . . . . . 35 31 Preventive maintenance tools and materials. . . . . . . . . . . . . . . . . . . . . 36 31 I tern 1, Exterior of set. . . . . . . . . . . . 37 32 Item 2, Panel controls. . . . . . . . . . . . 38 32 Item 3, Tubes . . . . . . . . . . . . . . . . . . . 39 32 Item 4, Crystals. . . . . . . . . . . . . . . . . 40 32 Item 5, Capacitors . . . . . . . . . . . . . . . 41 32 Item 6, Resistors. . . . . . . . . . . . . . . . . 42 33 Item 7, Switches. . . . . . . . . . . . . . . . . 43 33 Item 8, Fuse. . 44 33 Preventive maintenance check list. 45 33 VIII. Lubrication. Lubrication. . . . . . . . . . . . . . . . . . . . . . 46 34 IX. Special tools. Bristo wrench. . . . . . . . . . . . . . . . . . . . 4 7 34 Alignment tool. . . . . . . . . . . . . . . . . 48 34 Abrasive tools . . . . . . . . . . . . . . . . . . . 49 34 Soldering tip. . . . . . . . . . . . . . . . . . . . . 50 35 TABLE OF CONTENTS Paragraph Page X. Moistureproofing and fungiproofing. General . . . . . . . . . . . . . . . . . . . . . . . . . 51 35 Treatment. 52 36 Receiver-Transmitter BC-1335. . . . . 53 36 Moistureproofing and fungiproofing after repairs . . . . . . . . . . . . . . . . . . . 54 40 PART FOUR. Auxiliary equipment. Auxiliary equipment. . . . . . . . . . . . . . 55 40 PART FIVE. Repair instructions. Section XI. Theory of equipment. Treatment of theory . _ . . . 56 42 Condensed theory of operation. . . . 57 42 Receiver circuit. . . . . . . . . . . . . . . . . . 58 43 Antenna circuit . . . . . . . . . . . . . . . . . . 59 43 Radio-frequency amplifier stages. . . 60 47 Crystal oscillator. . . . . . . . . . . . . . . . . 61 47 Crystal oscillator amplifier. . . . . . . . 62 48 Mixer . . ,. . . . . . . . . . 63 50 First intermediate-frequency stage. . 64 51 Second intermediate-frequency am- plifier. . . . . . . . . . . . . . . . . . . . . . . . . 65 52 Limiter tube. . . . . . . . . . . . . . . . . . . . . 66 54 Discriminator. . . . . . . . . . . . . . . . . . . . 67 54 Audio amplifier . . . . . . . . . . . . . . . . . . 68 57 Transmitter circuit . . . . . . . . . 69 59 Direct-current amplifier. . . . . . . . . . . 70 61 Bias oscillator . . . . . . . . . . . . . . . . . . . 71 62 Reactance tube circuit. . . . . . . . . . . 72 63 Transmitter oscillator. . . . . . . . . . . . 73 65 Transmitter doubler circuit. . . . . . . 74 66 Radio-frequency power amplifier. . . 75 66 I Power supply. . . . . . . . . . . . . . . . . . . . 76 68 Filament circuit. . . . . . . . . . . . . . . . . 77 72 Control circuit. . . . . . . . . . . . . . . . . . . 78 75 Test circuit. . . . . . . . . . . . . . . . . . . . . . 79 76 v VI TABLE OF CONTENTS Paragraph Page Section XII. Trouble shooting. General trouble-shooting informa- tion. . . . . . . . . . . . . . . . . . . . . . . . . . 80 78 General procedure. . . . . . . . . . . . . . . 81 80 Preliminary steps with cover on. . . 82 80 Preliminary steps with cover off. . . 83 81 Trouble-shooting procedures. . . . . . . 84 86 Sectionalizing trouble in receiver section. . . . . . . . . . . . . . . . . . . . . . . . 85 87 Sectionalizing trouble in transmitter section. . . . . . . . . . . . . . . . . . . . . . . . 86 89 Localizing trouble in power supply section 00 87 90 Terminal identification chart . . . . . . 88 92 Point-to-point resistance measure- ments. . . . 89 97 Voltage checks at test strip. . . . . . . 90 104 Noise suppression. . . . . . . . . . . . . . . . 91 106 XIII. Repairs. General. . . . . . . . . . . . . . . . . . . . . 92 107 Handling of tools. . . . . . . . . . . . . . 93 108 Replacement of parts. . . . . . . . . . . . . 94 109 Rustproofing and repainting. . . . . . . 95 112 Unsatisfactory Equipment Report. . 96 113 XIV. Alignment and adjustment. Test instruments. . . . . . . . . . . . . . . . . 97 113 Alignment of receiver intermediate- . frequency amplifier and discrimi- nator using Maintenance Equip- ment ME-13-( ). . . . . . . . . . . . . . . . 98 115 Calibration and neutraliation using Maintenance Equipment ME-13- ( )00 00 0 0 0 0 0 0 0 0. 0 0 0 0 0. 0 0 0 0. 99 116 Alignment of receiver intermediate- frequency amplifier and discrimi- nator, using test circuit. . . . . . . . . 100 121 Calibration using test circuits in Receiver-Transmitter BC-1335 . 101 124 TABLE OF CONTENTS Paragraph Pag XV. Presetting. Preliminary instructions . 102 126 . Presetting chart for tuned receiver and transmitter circuits. . . . . . . . . 103 128 Step-by-step instructions. . . . . . . . . . 104 130 APPENDIX. Section XVI. References. Army regulations . . . . Supply publications . . Technical manuals on auxiliary equipment and test equipment . Painting, preserving, and lubrica- 105 106 107 tion . . 108 Camouflage . 109 Shipping instructions. . . . . . . . . . . . . 110 Decontamination . . . . 111 Demolition. . . . . . . . . . . . . . . . . . . . . . 112 Other publications. . . . . . . . . . . . . . . . 113 Forms . . 114 Abbreviations . 115 Glossary. . . . . . . . . . . . . . . . . . . . . . . . 116 XVII. Maintenance parts. Maintenance parts for Receiver- 132 132 132 132 132 132 133 133 133 133 134 134 Transmitter BC-1335 . 117 134 Vll Fig. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 .28 29 VIII LIST OF ILLUSTRATIONS Title Receiver-Transmitter BC-1335 . Receiver-Transmitter BC-1335, front and rear views. Receiver-Transmitter BC-1335, simplified block dia- gram of Radio Set SCR-619 . . Radio Set SCR-619, frequency spectrum chart . . . Receiver-Transmitter BC-1335, accessories . . . Receiver-Transmitter BC-1335, dimensions . . Receiver-Transmitter BC-1335, packaging . . Receiver-Transmitter BC-1335, cutaway showing packaging . . . . . Receiver-Transmitter BC-1335, control panel . . Microphone T-17, press-to-talk switch . Microphone and headset jacks on control panel . Receiver-Transmitter BC-1335, microphone and head- set plugged in . . . . . . . . . Construction of abrasive tools . . Page XII 2 3 6 7 9 10 11 13 14 15 17 35 Receiver-Transmitter BC-1335, top view, masked for varnish spraying . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Receiver-Transmitter BC-1335, boLLom view, masked for varnish spraying . Receiver-Transmitter BC-1335, complete block dia- gram . . Receiver-Transmi Lter BC-1335, receiver . Receiver-Transmitter BC-1335, receiver antenna cir- cuit . . . . Receiver-Transmitter BC-1335, receiver r-f amplifier. Receiver-Transmitter BC-1335, receiver crystal oscil- lator . . . . Receiver-Transmitter BC-1335, receiver crystal oscil- lator amplifier . . . . . Receiver-Transmitter BC-1335, receiver mixer . . Receiver-Transmitter BC-1335, receiver first i-f am- plifier . . . 39 41 44 45 46 48 49 50 51 Receiver-Transmitter BC-1335, receiver second i-f amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Receiver-Transmitter BC-1335, receiver limiter . . . . . 53 Receiver-Transmitter BC-1335, receiv r discriminator 56 Receiver-Transmitter B -1335, receiver audio ampli- fier and test circuit . . Receiver-Transmitter BC-1335, transmitter . . Receiver-Transmitter BC-1335, d-e amplifier in a-f-c circuit . . . . . 58 60 61 Fig. No. 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 .57 58 59 60 61 LIST OF ILLUSTRATIONS Title Page Receiver-Transmitter BC-1335, transmitter bias oscil- lator. . . . . . 62 Receiver-Transmitter BC-1335, transmitter reactance modulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Receiver-Transmitter BC-1335, transmitter oscillator 65 Receiver-Transmitter BC-1335, transmitter doubler. 67 Receiver-Transmitter BC-1335, transmitter push-pull power amplifier . . . . . . . . . . . . 69 Receiver-Transmitter BC-1335, high-voltage supply. 70 Receiver-Transmitter BC-1335, filament circuit supply 73 Receiver-Transmitter BC-1335, control circuit. . . . . . 75 Receiver-Transmitter BC-1335, test circuit . . . . . . . . . 77 Receiver-Transmitter BC-1335, capacitors. . . . . . . . . 83 Receiver-Transmitter BC-1335, resistors and chokes. 84 Receiver-Transmitter BC-1335, bottom view. . . . . . . . 85 Receiver-Transmitter BC-1335, top view. . . . . . 86 Terminal panel voltage diagram taken with electronic voltmeter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Tube socket voltage diagram, bottom view, taken y.rith electronic voltmeter. . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Terminal panel voltage diagram taken with 1,000- ohm-per-volt voltmeter . . . . . . . . . . . . . . . . . . . . . . . . 100 Tube socket voltage diagram, bottom view, taken with 1,000-ohm-per-volt voltmeter . . 101 Terminal panel resistance diagram . . . 102 Tube socket resistance diagram, bottom view. . . . . . . 103 Tube base connections, bottom view . . 105 Modified soldering iron tip. . . . . . . . . . . . . . . . . . . . . . . 108 Counters on r-f coils, assembly . . 110 Watersealed control shaft assembly . . . 111 Jack water seals, assembly. . . . . . . . . . . . . . . . . . . . . . . 112 W.D., A.G.O. Form No. 468, sample form . . 114 Receiver-Transmitter BC-1335, top view alignment adjustments. . . . . . . . . . .

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