BC-375D_serv_user_1941.pdf

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1、i, t I INSTRUCTION BOOK FOR RADIO TRANSMITTER BC-375-D - -4-fl! AND ASSOCIATED EQUIPMENT - MANUFACTURED BY GENERAL ELECTRIC COMPANY U.S.A. RESTRICTED PUBLISH;ED JJY AUTHORITY OF THE CHIEF SIGNAL OFFICER ORDER No. 700-NY.U ORDER No. 1508-NY-.U ( INSTRUCTION BOOK FOR RADIO TRANSMITTER BC-375-D AND ASS

2、OCIATED EQUIPMENT r I Manufactured By GENERAL ELECTRIC COMPANY U.S.A. . RESTRICTED. Notice:-This document contains information affecting the national defense of the United States within the meaning of the Espionage Act (U.S.C. 50:31, 32). The trans- mission of this document or the revelation of its

3、contents in any manner to any un- authorized person is prohibited. The information contained in documents marked RESTRICTED will not be com- municated to the public or to the press, but it may be communicated to any perso known to be in the service of the United States and to persons of undoubted lo

4、yalty and discretion who are co-operating in governmental work. (AR-380-S). PUBUSHED BY AUTHORITY OF THE CHIEF SIGNAL OFFICER ORDER NO. 700.NY41 941 (2500) ORDER NO. l508NY-41 941 (750) (GEI-13935A) -i- SAFETY TO HUMAN LIFE OPERATION OF THIS EQUIPMENT INVOLVES THE USE OF HIGH VOLTAGES WHICH ARE DANG

5、ER- OUS TO LIFE. OPERATING PERSONNEL MUST AT ALL TIMES OBSERVE ALL SAFETY REGULATIONS. DO NOT CHANGE TUBES OR MAKE ADJUSTMENTS INSIDE EQUIPMENT WITH HIGH-VOLT AGE SUP- PLY ON. DO NOT COMPLETE OR MAINTAIN ANY CONNECTION BETWEEN RADIO TRANSMITTER AND DYNAMOTOR UNIT UNLESS ALL SHIELDS ON THE RADIO TRAN

6、SMITTER ARE IN PLACE. KEEP AWAY FROM LIVE CIRCUITS 1. Under no circumstances should any person be permitted to operate the dynamotor unit with relay-fuse box cover or end bells removed; or to replace fuses with power on; or to remove, place, or handle removed plugs with the dynamotor unit running. 2

7、. Under no circumstances adjust circuits or service the equipment when only the carrier is keyed off. The radio transmitter uses a grid-bias keying circuit, which does not remove high voltage when the key is open. DO NOT OPERATE THE EQUIPMENT WITH SHIELDS REMOVED. -iii- Fig. 1 g. 2 Fig. 3 Fig. 4 Fig

8、. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 Fig. 20 Fig. 21 Fig. 22 Fig. 23 Fig. 24 Fig. 25 Fig. 26 Fig. 27 Fig. 28 Fig. 29 Fig. 30 Fig. 31 Fig. 32 Fig. 33 Fig. 34 Fig. 35 Fig. 36 Fig. 37 Fig . 38 Fig. 39 Fig. 40 Fig. 41 Fig. 42 Fig

9、. 43 Fig. 44 Fig. 45 Fig. 46 Fig. 47 Fig. 48 LIST OF ILLUSTRATIONS Page Radio Transmitter BC-375-P and Associated Equipment . . . . viii Antenna Tuning Unit BC-306-A . . . . . 1 Case CS-48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10、. . . . . . . . . . . . . . . . . . 2 Dynamotor Unit PE-73-C . . . . . . . . . . . . . . . 2 Radio Transmitter BC375-D, Transmitter Tuning Unit TU-22-B in Place. . . . . . . . . . . . . . . . . . 3 Typical Front View . of a Transmitter Tuning Unit without a Band Change Switch. . . . . . . . . . . .

11、4 Mounting FT-1J5,B . . . . . . . . . 6 Radio Transmiter BC-375-D, Tube Compartment Shield Removed and Transmitter Tuning Unit TU-22-B Being Inserted . . . . . 8 Radio Transmitter BC-375-D, Filament Resistor and Terminal Board . . . 9 Antenna Reactance Curve . . . . . . . . . . 12 Radio Trwsmitter B

12、C-375-D, Functional Diagram of Radio-Frequency and High-Voltage Circuits . . . . . 17 Radio Transmitter BC-375-D, Functional Diagram of Antenna Tuning Circuits . . . 18 Radio Transmitter BC-375-D, Functional Diagram of Audio-Frequency Circuits- Tone Oper- ation . . . . . . . . 19 Radio Transmitter D

13、C-375-D, Functional Diagram of Audio-Frequency Circuits-CW Oper- ation (Side Tone) . . . . . 20 Radio Transmitter BC-375-D, Functional Diagram of Audio-Frequency Circuits- Voice Operation . . . . . . . 21 Radio Transmitter BC-375-D, Functional Diagram of Low-Voltage and Control Circuits . 21 Tube VT

14、 -4-C, Characteristic Curves . . . . 22 Tube VT-25, Characteristic Curves . . . . 23 Antenna Tuning Unit BC-306-A, Schematic Diagram . . . . 23 Dynamotor Unit PE-73-C, Schematic Diagram . . . . . . . 24 Antenna Tuning Unit BC-306-A, Interior View . . . 51 Dynamotor Unit PE-73-C, Mounting FT-107 and

15、Low-Voltage End Bell Removed . . 52 Dynamotor Unit PE-73-C, Mounting FT-107 and High-Voltage End Bell Removed . 53 Dynamotor Unit PE-73-C, Top View, Mounting FT-107 and Relay-Fuse Box Cover Removed . 54 Radio Transmitter BC-375-D, Tube Compartment Shield and Top Cover Off and Transmitter Tuning Unit

16、 in Place . . . . 5.5 Radio Transmitter BC-375-D, Rear View, Mounting FT-151-A and Shields Removed . . 56 Radio Transmitter BC-375-D, Rear View, Mounting FT-151-A J.nd Shields Removed . 57 Radio Transmitter BC-375-D, Bottom View, Mounting FT-151-A and Shields Removed . 58 Transmitter Tuning Unit TU-

17、5-B, Top View, Cover Removed . . . . . . . . 59 Transmitter Tuning Unit TU-5-B, Bottom View, Cover Removed . . . . . 59 Transmitter Tuning Unit TU-6-B, Top View, Cover Removed . . . . 60 Transmitter Tuning Unit TU-6-B, Bottom View, Coyer Removed . . 60 Transmitter Tuning Unit TU-7-B, Top View, Cover

18、 Removed . . . 61 Transmitter Tuning Unit TU-7-B, Bottom View, Cover Removed . . . 61 Transmitter Tuning Unit TU-8-B, Top View, Cover Removed . . . . . 62 Transmitter Tuning Unit TU-8-B, Bottom View, Cover Removed . . . . . 62 Transmitter Tuning Unit TU-9-B, Top View, Cover Removed . . . . . . 63 Tr

19、ansmitter Tuning Unit TU-9-B, Bottom View, Cover Removed . . . . . . . . 63 Transmitter Tuning Unit TU-10-B, Top View, Cover Removed . . . 64 Transmitter Tuning Unit TU-10-B, Bottom View, Cover Removed . . 64 Transmitter Tuning Unit TU-22-B, Top View, Cover Removed . 65 Transmitter Tuning Unit TU-22

20、-B, Bottom View, Cover Removed . 65 Antenna Tuning Unit BC-306-A, Connection Diagram . . . . 66 Antenna Tuning Unit BC-306-A, Outline Dimensional Sketch . . . . . 67 Case CS-48, Outline Dimensional Sketch . . . . . 68 Dynamotor Unit PE-73-C, Connection Diagram . . . . . . 69 Dynamotor Unit PE-73-C,

21、Outline Dimensional Sketch . . . 70 Mounting FT-115-B, Outline Dimensional Sketch . . 71 -vi- Fig. 49 Fig. 50 Fig. 51 Fig. 52 Fig. 53 Fig. 54 Fig. 55 Fig. 56 Fig. 57 Fig. 58 Fi:g. 59 Fig. 60 LIST OF ILLUSTRATIONS (Continued) Page Radio Transmitter BC-375-D, Schematic Diagram . . . . . . 73 Radio Tra

22、nsmitter BC-375-D, Connection Diagram . 75 Radio Transmitter BC-375-D, Outline Dimensional Sketch . . . . 77 Transmitter Tuning Units, Schematic Diagram . . 78 Transmitter Tuning Unit TU-5-B, Connection Diagram . . 79 Transmitter Tuning Unit TU-6-B, Connection Diagram . 80 Transmitter Tuning Unit TU

23、-7-B, Connection Diagram . . . 81 Transmitter Tuning Unit TU-8-B, Connection Diagram . 82 Transmitter Tuning Unit TU-9-B, Connection Diagram . . . 83 Transmitter Tuning Unit TU-10-B, Connection Diagram . . . . . 84 Transmitter Tuning Unit TU-22-B, Connection Diagram . . . 85 Radio Set SCR-287-A, Cor

24、ding Diagram . . 86 -vu- MAINTENANCE PARTS RADIO TRANSMITTER sc-37:5-D I ., MOUNTING FT-115-B t MOUNTING FT-151-A TRANSMITTER TUNING UNIT DYNAMOTOR UNIT PE -73- C . MOUNTING FT-107 ANTENNA TUNING UNIT BC -306- A r, MOUNTING FT-142 FIG. 1. RkDIO TRANSMITTER BC-375-D AND AssociATED EQUIPMENT -V!II- Pa

25、rs. 1-7 I. DESCRIPTION OF COMPLETE EQUIPMENT GENERAL 1. Radio Transmitter BC-375-D with its associated equipment is designed for aircraft and othe applica- tions requiring a medium power equipment with the characteristics of strength, light weight, flexibility, and portability. The equipment is desi

26、gned to pro- vide communication by voice, tone, or continuous- wave telegraphy over the frequency range of 150 to 12,500 kilocycles. However, only the frequencies covered by the Transmitter Tuning Units listed in paragraph 16 are available for use with this equip- ment. Suitable tuning equipment is

27、provided in the radio transmitter to permit operation into a wide range of antennas over most of the frequency range. Antenna Tuning Unit BC-306-A may be used to extend the range of antenna tuning for frequencies between 150 and 800 kilocycles. 2. Dynamotor Unit PE-73-C furnishS the power ANTENNA (B

28、) FT-142 FIG. 2. ANTENNA TUNING UNIT BC-306-A required by the radio transmitter and operates from a 24/28 volt storage battery or other direct- current source used in aircraft. The input power when operating on continuous-wave telegraph will be approximately 600 watts. The fully modulated voice tran

29、smission will require 840 watts input power. 3. Because of the flexibility with which it can be adapted to fit different requirements and conditions of operation, Radio Transmitter BC-375-D may be used as an item of a number of different radio sets. The other items, such as tuning unit, cords, etc.,

30、 will be listed in the Parts List of each set. I ANTENNA TUNING UNIT BC-306-A (INCLUDES MOUNTING FT-142) 4. This unit consists of a painted duralumin case which houses a variometer 1502, control F; and a switch 1501, control E. Sufficient inductive reactance is provided in this unit, in addition to

31、the reactance provided in the radio transmitter and transmitter tuning units, to resonate antennas whose effective capacitance varies as indicated below: 1 Frequency Range 150-350 kc 350-800 kc Effective Capacitance Range 1000- 1500 mmfds 350-800 mmfds 5. The controls permit a continuous variation o

32、f the -inductive reactance. Suitably insulated binding posts are located on the top shield. Four snap-slide catches are used to attach the unit to Mounting FT-142. 6. The terminals at the top of the antenna tuning unit are for interconnection between the loading ter- minals of the radio transmitter

33、when operating on frequencies above 400 kilocycles. For operation on frequencies below 400 kilocycles, the antenna tuning unit is connected in the antenna circuit and the two loading terminals are connected together as de- scribed in section II, EMPLOYMENT. CASE CS-48 7. This case consists of an ind

34、ividual metal con- tainer into which any one of the trartsmitter tuning units may be inserted and mounted or carried. The tuning unit is secured in the case by the same four snap-slide catches that are used to secure the unit in the radio transmitter. Pars. 8-9 FIG. 3. CASE CS-48 DYNAMOTOR UNIT PE-7

35、3-C (INCLUDES MOUNTING Ff-107) 8. Dynamotor Unit PE-73-C consists of a dyna- motor upon which is mounted a box conta.ning the relay, fuses, sockets, capacitors, etc. The dynamotor proper is a two-pole, totally-enclosed, ball-bearing, d-e to d-e rotating machine. It is rated at 28 volts, 20 amperes i

36、nput; 1000 volts, 0.35 amperes output, at 5000 rpm, with 55 deg. Centigrade rise for % hour intermittent duty. It has been designed to give efficient, reliable service over long periods of time with a minimum of attention. Skeleton type bearing brackets on each end afford maximum accessibility to th

37、e commutators and brushes. The portion of the armature winding between each commutator and armature core is securely bound with cord and thor- oughly impregnated, thus affording a mechanical protection for the armature winding against injury from moisture, dirt, and abrasion. The external leads of t

38、he dynamotor go directly into the relay-fuse box through two bushings in the top of the magnet frame. 9. A totally-enclosed, solenoid-type starting relay, particularly designed to withstand vibration, sudden shock and acceleration as encountered in aircraft installation, is used. The double-break co

39、ntacts are sufficiently large to carry the heavy starting current of the dynamotor. FIG. 4. DYNAMOTOR UNIT PE-73-C 2 Pars. 10-14 1121 1141 194 1168 1198 NEUTRALIZING CONTROL UNDER CALl BRATION CHART FIG. 5. RADIO TRANSMITTER BC-375-D, TRANSMITTER TUNING UNIT TU-22-B IN PLACE 10. The input binding po

40、sts and fuse clips are mounted on and securely pinned to a molded terminal board. In addition, all fuse clips and terminals are soldered to their mounting screws so as to insure a tight, low resistance, electrical contact. 11. Four snap-slide catches are employed to fasten the cover to the relay-fus

41、e box. A spare H-V fuse, spare fuse links, and a socket wrench are carried in clips inside of this cover. In one end of the relay-fuse box are mounted the Sockets S0-39 and S0-41. A H in. diameter hole for entrance of a conduit con- taining the two power-input leads is provided between these sockets

42、. 12. A radio-frequency interference filter is in- cluded. This is designed to eliminate objectionable noise in associated receiving equipment due to operation of the dynamotor alone. The filter consists of capacitors connected so as to by-pass various dynamotor circuit points and give maximum noise

43、 suppression. 3 RADIO TRANSMITTER BC-375-D (INCLUDES MOUNTING FT-151-A) 13. Radio Transmitter BC-375-D consists of a shielded metal cabinet containing the necessary vacuum tubes, sockets, antenna tuning equipment, audio-frequency circuits, input and output terminals and plug connectors for connection to the Tadio- frequency circuits contained in the transmitter tuning units. The circuits of this unit are shown in Fig. 49, and its exte