SCR-506A_serv_user_TM11-630_1944.pdf

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SCR-506A_serv_user_TM11-630_1944.pdf

,. c - ,( D WAR DEPARTMENT TECHNICAL MANUAL I RADIO SET SCR-506-A This is a reprint of T M 11-630, Radio Set SCR-506-A. o distri- bution will be made to personnel possessing the original publication. y WAR DEPARTMENT NOVEMBER 1944 I WAR DEPARTMENT TECHNICAL MANUAL TM 11-630 RADIO SET SCR-506-A WAR DEPARTMENT United States Government Printing Office Washington : 1945 NOVEMBER 1944 II WAR DEPARTMENT WASHINGTON 25, D. C., 1 November 1944. TM 11-630, Radio Set SCR-506-A, is published for the information and guidance of all con- cerned. A. G. 300.7 (!l!t June 44).) BY ORDER OF THE SECRETARY OF WAR: OFFICIAL: J. A. ULIO, Major General, The Adjutant General. G. C. MARSHALL Chif of St_tf. -7 -I 1b: ci L - - - PART ONE. INTRODUCTION. Section I. Description. Paragraph Page General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Technical characteristics . . . . 3 3 List of components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5 Packaging data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 Major components of Radio Set SCR-506-A . . . . . . . . . . . . . . . . . . . 6 6 Radio Transmitter BC-653-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 11 Radio Receiver BC-652-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 11 Dynamotor DM-40-A or DM-41-A . . . . : . . . . . . . . . . . 9 11 Dynamotor DM-42-A or DM-43-A. . . . 10 11 Mounting FT-253-A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 12 Switch Box BC-658-A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 12 Loudspeaker LS-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 12 Headset HS-30-( ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 12 Key J-45. . . . 15 12 Microphone T-17. . . . . 16 12 Microphone T-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 12 Vehicular antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 12 Antenna AN-24-A. . . . 19 12 Antenna A-27 (Phantom) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 12 Mast Base Bracket MP-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 13 Cabinet CH-74-A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 13 C)lest CH-263 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 18 Cover BG-67-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 IS Roll BG-56-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 13 Section II. Assembly and installation. Unpacking, uncrating, and checking . . . . . . . . . . . . . . . . . . . . . . . . . . 26 14 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 18 Connections and interconnections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 18 Siting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 18 III PART TWO. OPERATING INSTRUCTIONS. Section Ill. Controls and their use. Paragraph Page Transmitter . . . 30 21 Receiver . . . 31 23 Crystal-frequency calibrator . . . . 32 25 Section IV. Operation. Net operation, . . 33 27 Interference . . . . 34 27 Precautions . . . . . . . 35 27 Antennas . . . . . . . . . . 36 27 Continuous-wave operation . . . . 37 28 Voice operation . 38 29 Turning off the radio set . . . . 39 31 Section V. Equipment performance check list. Instruclions on use of check list . . . . 40 32 Equipment performance check list . 41 33 PART THREE. PREVENTIVE MAINTENANCE. Section VI. Preventive maintenance techniques. Meaning of preventive maintenance . . . . . . . 42 37 Description of maintenance techniques . - . . . . . . 43 37 Vacuum tubes . 44 38 Capacitors . 45 38 Resistors . . 46 39 Fuses . -47 39 Bushings and insulators . . 48 40 Relays . . 49 40 Switches . . . 50 41 Coils . . 51 41 Rheostats and potentiometers . . 52 41 Terminal blocks . . . . . . 53 42 Multiple connectors . . . 54 42 Cords an<l cables . . . . . . 55 42 Meters . . . . . . . 56 43 Dynamotors . . . 57 43 Pilot lights . . . . . . . 58 44 IV Paragraph Page Section VI. Preventive maintenance techniques ( contd). Cabinets, chassis, and mountings . . 59 44 Headset, microphone, key, and loudspeaker . . . 60 45 Jacks . . . . . . . . . . 61 45 Coupling shaft and control knobs . . . . 62 45 Gears . . . . . . . 63 46 Section VII. Maintenance Items. General . . 64 46 Materials . . . . . . . . 65 46 Daily items . . . . 66 46 Weekly items . . . 67 47 Monthly items . . . . . . . . 68 47 Six-month and yearly items . . . . 69 48 Preventive maintenance check list. . . . . 70 49 Section VIII. Lubrication. Section IX. Molstureprooflng and fungiprooflng. Gener . . . . 71 50 Treatment . . . . . . 72 50 Step-by-step instructions for treating Radio Receiver BC-652-A . 73 50 Step-by-step instructions for treating Radio Transmitter BC-653-A . 74 52 PART FOUR. AUXILIARY EQUIPMENT: NOT USED. PART FIVE. REPAIR INSTRUCTIONS. Section X. Theory of Radio Receiver BC-652-A. General . . . . . . 7 5 55 Block diagram of Radio Receiver BC-652-A . 76 5.5 Radio-frequency amplifier . . . . 77 56 Converter . . . . 78 57 Intermediate-frequency amplifier . 79 59 Detector and first audio . 80 59 oi e limiter . . 81 60 Audio output . 82 61 Beat-frequency oscillator . . 83 61 Crystal-frequency calibrator . 84 62 Receiver filament, dynamotor, and power-supply circuit . 85 63 V VI Paragraph Page Section XI. Theory of Radio Transmitter BC-653-A. General. . . . . . 86 65 Block diagram of Radio Transmitter BC-653-A . . . . 87 65 Master oscillator . . . . . . . 88 65 Intermediate power amplifier . . 89 66 Power amplifier . . . 90 68 Modulator . . . . . . . . 91 69 Link board, control circuit, and filament circuit . . . 92 71 Keying relay Kl61 . . . 93 71 POWER AND EMISSION switch . , . . 94 72 Transmitter Dynamotors DM-42-( ) and DM-43-( ) . . 95 73 Metering constants . . . . 96 73 Section XII. Trouble shooting. Trouble-shooting aids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 73 Trouble-shooting steps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 73 Precautions against high voltage . . . . . . . 99 74 Voltmeter loading . . . . 100 74 Test equipment . . . . 101 7 4 Trouble-shooting charts . . . . . . . 102 74 Section XIII. Repairs. Replacement of parts in Radio Receiver BC-652-A . 103 Replacement of parts in Radio Transmitter BC-653-A . 104 Emergency repair of Radio Receiver BC-652-A . 105 Emergency repair of Radio Transmitter BC-653-A . . 106 Rustproofing and repainting . . . . . . . 107 Special tools . . . 108 Unsatisfactory equipment report . . . . 109 96 96 96 97 99 99 99 Section XIV. Allgnment and adlustment of Radio Receiver BC-652-A. General . . 110 Preliminary steps . . . 111 Intermediate-frequency alignment . . . 112 Beat-frequency oscillator adjustment . . . . 113 Wave-trap adjustment . . 114 High-frequency oscillator alignment . . . 115 Radio-frequency amplifier and antenna adjustments . . . . 116 Crystal-frequency calibrator . . . 117 Minimum test requirements for Radio Receiver BC-652-A . 118 Test instruments required . 119 99 99 100 100 100 100 101 101 101 102 Paragraph Page Section XV. Alignment and adlustment of Radio Transmitter BC-653-A. General . . . . . . 120 102 Master-oscillator alignment . . . . . . . . . . 121 102 Intermediate-power-amplifier alignment . . . . . . 122 103 Power-amplifier bias and modulation adjustment . . 123 103 Test instruments required . . . . . . 124 104 Section XVI. Presetting. General . . . 125 104 Presetting the transmitter preset frequencies . . 126 105 Presetting the transmitter tunable frequencies . . . . 127 109 APPENDIX. Section XVII. Maintenance parts list. Maintenance parts list for Radio Set SCR-506-A. . . . . . 128 114 Maintenance parts list for Radio Transmitter BC-653-A. . . .129 121 Maintenance parts list for Radio Receiver BC-652-A . 130 132 Maintenance parts list for Mounting FT-253-A . 131 142 Maintenance parts list for Mast Base MP-57 . . 132 144 Maintenance parts list for Guy Set GY-40 . . . . 133 145 Maintenance parts list for Switch Box BC-658-A . . 134 145 Maintenance parts list for Headset HS-30-( ) . . . . . 135 145 Maintenance parts list for Microphone T-17-( ) . . . 136 145 Maintenance parts list for Microphone T-45 . . . . . . . . . 137 146 Section XVIII. Color codes. Types of capacitors and resistors . : . . . 138 147 Three-dot color code for mica capacitors . . . . . . 139 147 RMA color code for mica capacitors . . . 140 148 A WS color code for mica capacitors . . . . . 141 148 RMA color code for tubular ceramic dielectric capacitors . . . . . . . . 142 149 A WS color code for molded paper capacitors . 143 150 RMA and A WS color codes for fixed resistors . . . . . 144 150 Section XIX. References. Parts list . . . . . 145 152 Technical manuals on auxiliary equipment . . 146 152 Preventive maintenance . 147 152 Painting, preserving, and lubrication . . . . 148 152 Installation instructions . . . . . . 149 152 Shipping instructions . . . . 150 158 Decontamination . . . . . 151 153 Demolition . . . . . 152 153 Camouflage . . . . . 153 153 Other technical publications . . . . 154 153 Forms . . . 155 153 List of abbreviations . . . . 156 153 VII LIST OF ILLUSTRATIONS Fig. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Title Radio Set SCR-506-A . . . . . . . Radio Set SCR-506-A, simplified block diagram . . Radio Set SCR-506-A, frequency spectrum . . . . Microphone T-45 in operation . . . Radio Receiver BC-652-A, front view . . , . . . . Headset HS-30-( ) . . . . . Loudspeaker LS-3 with Cord CD-314 . . . . . Radio Transmitter BC-653-A, front view . . . . - Key J-45 . . . . Microphone T-17 . . . . Dynamotor DM-40-A . . . - Dynamotor DM-42-A . . -. - A Mast Sections MS-49 to MS-53, inclusive . . - B Mast Base MP-57 . . . . . . . - - - C Roll BG-56-A . . . . -. - - D Cover BG-67-A . . -. -. - Page 1 2 4 6 6 6 6 7 7 7 7 7 8 8 8 8 14 Mounting FT-253-A with Cords CD-280 . . . . -. 9 15 Antenna AN-24-A . . . . . . . . - 9 16 A

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