SCR-274N_serv_user_AN08-40SCR274-2_1944.pdf

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1、-* - AN 08-40SCR274-2 HANDBOOK OF OPERATING INSTRUCTIONS for RADIO SET SCR-274-N RESTRICTED (For Official Use Only) -* - COPlfYERUTHOGRAPHCORP.,ClEVELAND,OHlO APRIL,l9453,OOO Approved 4 OCTOBER 1944 RESTRICTED AN 08-40SCI.214-2 Published under joint authority of the United States War and Navy Depart

2、ments and the Air Council of the United Kingdom. SECURITY NOTICE FOR U. S. PERSONNEL: This document contains information affecting the national defense of the United States within the meaning of the Espionage Act, 50 U.s.c., 31 and 32, as amended. Its transmission or the revelation 9f its contents i

3、n any manner to an unauthorized person is prohibited by law. (AR 380-5) (ARTS 752 Radio Control Box BC-473-A for one Receiver-Front View (Right) . . 1-6. Rack FT-220-A and Mounting FT-221-A for Receivers-Front View . . 1-7. Radio Control Box BC-451-A for Transmitters-Front View . . 1-8. Antenna Rela

4、y Unit BC-442-A . . 1-9. Rack FT-226-A and Mounting FT-227-A for two Transmitters (Left); Rack FT- 234-A and Mounting FT-232-A for one Transmitter (Right) . . 1-10. Rack FT-331-A and Mounting FT-332-A for Transmitters . . 1-11. Modulator Unit BC-456-B (Top View with Shield Removed-also Bottom View o

5、f Dynamotor DM-33-A . . Page iv 1-5 1-5 1-6 1-6 1-7 1-7 1-7 1-8 1-8 1-9 Figure 5-1. Test Set RC-54-A-Instruction Diagram Page for Receiver Testing. . . . . . . . . . . . . . . . . . 5-2 5-2. Test Set RC-55-A-Instruction Diagram for Transmitter Testing . 5-3-5-4 5-3 Assembly Drawing of Cords for Test

6、 Sets RC-54-A and RC-55-A . 5-5-5-6 5-4. Instruction Diagram for Testing Acces- sories of Radio Set SCR-274-N . 5-7-5-8 5-5. Radio Set SCR-274-N -Installation Di mensions and Weight of Receivers, Racks and Mountings . 5-9-5-10 5-6. Radio Set SCR-274-N -Installation Di- mensions and Weights of Transm

7、itters, Racks and Mountings . 5-11-5-12 5-7. Aadio Set SCR-274-N-Installation Di mensions and Weights of Radio Control Boxes, Antenna Relay Unit and Modu- lator Unit . . 5-13-5-14 5-8. Assembly Drawing of Plugs and Tuning Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15-5-16 5-9. Rad

8、io Set SCR-274-N -Interconnecting Diagram . 5-17 -5-18 5-10. Radio Set SCR-274-NTypical Intercon- necting Wiring Diagram . 5-19-5-20 RESTRICTED i RESTRICTED AN 08-40SCR274-2 eoJ ,(/ MoieMeJ Ut, tk eOHtlxd 3tU1e In case it should become necessary to prevent the capture of this equipment and when orde

9、red to do so, DE STROY IT SO THAT NO PART OF IT CAN BE SALVAGED, RECOGNIZED OR USED BY THE ENEMY. BURN ALL PAPERS AND BOOKS. Means:- 1. Explosives, when provided. 2. Hammers, axes, sledges, machetes, or whatever heavy object is readily available. 3. Burning by means of incendiaries such as gasoline,

10、 oil, paper, or wood. 4. Grenades and shots from available arms. 5. Burying all debris or disposing of it in streams or other bodies of water, where possible and when time permits. Procedure:- 1. Obliterate all identifying marks. Destroy nameplates and circuit labels. 2. Demolish all panels, casting

11、s, switch- and instrument- boards. 3. Destroy all controls, switches, relays, connections, and meter.s. 4. Rip out all wiring and cut interconnections of electrical equipment. Smash gas, oil and water- cooling systems in gas-engine generators, etc. 5. Smash every electrical or mechanical part, wheth

12、er rotating, moving, or fixed. 6. Break up all operating instruments such as keys, phones, microphones, etc. 7. Destroy all classes of carrying cases, straps, containers, etc. 8. Bury or scatter all debris. DESTROY EVERYTHING! * For U. S. Army Air Flirce Personnel: In the event of malfunctioning, un

13、satisfactory desig n, or unsatisfactory installation of any of the compon ent units of this equipment, or if the material contained in this book is considered inadequate or erroneous, an Unsatisfactory Report, AAF Form No. 54, or a report in similar form, shall be submitted in accordance with the pr

14、ovisions of Army Air Force Regulation No. 15-54 listing: 1. Station and organization. 2. Nameplate data (type number or complete nomenclature if nameplate is not attached to the equipment). 3. Date and nature of failure. 4. Radio model and serial number. 5. Remedy used or proposed to prevent recurre

15、nce. 6. Handbook errors or inadequacies, if applicable. For U. S. Navy Personnel: Report of failure of any part of this equipment during its guarnteed life shall be made on Form N. Aer. 4112, Report of Unsatisfactory or Defective Material, or a report in similar form, and forwarded in ac cordance wi

16、th the latest instructions of the Bureau of Aeronautics. In addition to other distribution required, one copy shall be furnished to the inspector of Naval Materiel (location to be specified) and the Bureau of Ships. Such reports of failure shall include: 1. Reporting activity. 2. Nameplate data. 3.

17、Date placed in service. 4. Part which failed. 5. Nature and cause of failure. 6. Replacement needed (yes-no). 7. Remedy used or proposed to prevent recurrence. For British Personnel: Form 1022 procedure shall be used when reporting failure of radio equipment. RESTRICTED iii Section I RESTRICTED AN 0

18、8-40SCR274-2 figure ,-,. Radio Set SCR-274-N-Components iv RESTRICTED RESTRICTED Section I Paragraphs 1-2 AN 08-40SCR274-2 SAFETY NOTICE This equipment employs high voltages which are dangerous and may be fatal if contacted by operating personnel. Extreme caution should be exercised when working wit

19、h the equipment. SECTION I GENERAL DESCRIPTION I. GENERAL (See figure 1-1.) a. Radio Set SCn.-274-N is a multichannel aircraft radio receiving and transmitting equipment. The radio set consists basically of a group of three receivers and a group of two or four transmitters, each group with its speci

20、al rack and mounting. The set can be remotely or locally controlled. h. The frequency ranges of the radio receivers (fig. 1-2) of Radio Set SCR-724-N are as follows: Receiver Frequency Radio Rceiver BC-453-A or BC-453-B . 190-550 kilocycles Radio Receiver BC-454-A or BC-454-B . 3.0-6.0 megacycles Ra

21、dio Receiver BC-455-A or BC-455-B . 6.0-9.1 megacycles Radio Receiver BC-946-B . 0.52-1.5 megacycles c. The frequency ranges of the radio transmitters (fig. 1-3) of Radio Set SCR-274-N are as follows: 2. EQUIPMENT SUPPLIED. The following table lists the equipment supplied: a. RECEIVING EQUIPMENT. (S

22、ee figures 1-1 to 1-11.) Transmitter Frequency (in megacycles) Radio Transmitter BC-696-A . 3.0-4.0 Radio Transmitter BC-457-A . .4.0-5.3 Radio Transmitter BC-458-A . 5.3-7 . Radio Transmitter BC-459-A . 7.0-9.1 d. The receivers receive continuous wave ( cw) , or amplitude modulated . continuous wav

23、es (mcw) , while the transmitters transmit on tone or voice. e. Primary power is obtained from the 24- to 28-volt d-c supply on the airplane. The current drain is 1.6 amperes per receiver for a normal input of 28 volts. The current drain in a two-transmitter installation at 28 volts input is 9 amper

24、es at maximum power output and 2.5 amperes when not transmitting. (The peak power output of each transmitter under optimum an tenna loading conditions exceeds 40 watts on cw for 28 volts input.) (1) FOR THREE-RECEIVER INSTALLATION. The following parts are supplied for this type of installation: Quan

25、tity per Name of Unit Army Type Navy Type Overall Dimensions Weight Equipment Designation Designation (inches) (pounds) 1 each Radio Receivers BC-453-A * 427 x 7% X 527 5.7 (BC-453-B) BC-454-A 42 x 7% x 527 5.7 (BC-454-B) BC-455-A 427 x 7% X 527 5.7 (BC-455-B) 3 Dynamotor DM-32-A 3.0 RESTRICTED 1-1

26、Section I Paragraph 2 Quantity per Equipment 3 3 1 1 6 1 1 I 1 1 1 1 3 3 1 1 1 Name oj Unit Adapter (for remote control) or Adaptt:r Control Unit and Plug (for local control) Coupling Rack Mounting Plug Plug Plug Radio Control Box (Three-receiver) includes: Dial Dial Dial Mounting Tube Set includes:

27、 Tube Tube Tube Tube RESTRICTED AN 08-40SCR274-2 Army Type Navy Type Overall Dimensions Weight Designation Designation (inches) (pounds) FT-230-At 0.1 FT-260-A 0.1 MC-237-A 0.1 PL-192 0.13 MC-211-A 0.25 F1-220-A 4.0 FT-221-A 16U6 x 102 x 1% 1.0 PL-152-A 0.13 Pl-147-A PL-1 5 I-A BC-450-A 9Y2 x 51%2 x

28、 21% 2.7 MC-212 MC-213 MC-214 FT-222-A 9Y2 x 51%2 x Y2 0.7 JAN-12SK7 JAN-12SK7 JAN-12KBY JAN-12KBY JAN-12SR7 JAN-12SR7 I JAN-12A6 JAN-12A6 (2) FOR ONE-RECEIVER INSTALLATION.-Includes one receiver, tube set, dynamotor, adapter, plug, and coupling as listed in paragraph 2a( 1) this section plus: Quant

29、ity per Name oj Unit Army Type Navy Type Overall Dimensions Weight Equipment Designation Designation (inches) (pounds) Rack FT-233-A 1.3 t Mounting FT-231-A 61 x 102 x 1% 0.7 t Radio Control Box BC-473-A 3 x 51%2 x 21%6 0.9 (BC-473-B) includes: Dial MC-212 Mounting FT-235-A 3 x 51%2 x Y2 0.7 (FT-235

30、-B) 1-2 RESTRICTED RESTRICTED AN 08-40SCR274-2 Section I Paragraph 2 (3) FOR TWO-RECEIVER INSTALLATION.-Includes two receivers, tube sets, dynamotors, adapters, plugs, and couplings as listed in paragraph 2a( 1) above, plus: Quantity per Name of Unit Army Type Navy Type Equipment Designatior. Design

31、ation t Rack FT-277-A t Mounting FT-279-A t Radio Control Box BC-496-A Dial MC-213 Dial MC-214 Mounting FT-240-A *Radio Receiver BC946B (.521.5 mc) may be substituted for anyone of the receivers. tVariable, depending upon operating requirements. Adapter FT310A used for Radio Receiver BC-946B. Dial M

32、C415. h. TRANSMITTING EQUIPMENT. (1) The following equipment is supplied for all transmitter installations Quantity per Name of Unit I Army Type Navy Type Equipment Designation Designation 1 Radio Control Box BC-451-A 1 Mounting FT-228-A 1 Plug PL-153-A 1 Modulator Unit BC-456-A (BC-456-B, BC-456-E)

33、 1 Dynamotor DM-33-A 1 Mounting FT-225-A I I Tube Set including: 1 Tube JAN-12J5GT JAN-12J5GT 1 Tube JAN-1625 JAN-1625 1 Tube JAN-OD3/VR 150 JAN-OD3/VR150 1 Plug PL-153-A 1 Plug PL-148-A 1 Plug PL-151-A 1 Plug PL-154-A 1 Antenna Relay BC-442-A or Unit BC-442-AM 1 Mounting FT-229-A 1 Plug PL-156-A *

34、Tuning Shaft MC-215 * Cord RESTRICTED Overall Dimensions Weight (inches) (pounds) 2.5 11%x 102%2 x 1% 0.8 6% x 51%2 x 216 1.7 6% x 51%2 x Yz 0.7 I Overall Dimensions Weight (inches) (pounds) 4Ys x 4% x 2% I .9 4Ys x 3?i2 x 6 .7 .13 10;,j6 x 76 x 8 Y8 9. 8. 1 0;,j6 x 292 x 8 Y8 .7 .3 5% x 42x 66 2.2

35、5% x 42 x 5 2.0 5% x 29 x 5 .7 .13 0.12 per ft. 0.17 per ft. 1-3 Section I Paragraph 3 RESTRICTED AN 08-40SCR274-2 (2) FOR FOUR-TRANSMITTER INSTALLATION. Quantity per Name of Unit Army Type I Navy Type Equipment Designation Designation 1 each Radio Transmitter BC-696-A BC-457-A BC-458-A BC-459-A t R

36、ack FT-331-A t Mounting FT-332-A 4 Tube Set includes: 2 Tube JAN-1625 JAN-1625 1 Tube JAN-1626 JAN-1626 1 Tube JAN-1629 JAN-1629 1 Plug PL-154-A 1 Plug PL-156-A Overall Dimenons Weight (inches) (pounds) 7 x -81%i x 15 8.3 7 x 81%i x 15 8.3 7 x 81;6 x 15 8.3 7 x 81;6 x 15 8.3 4. 23% x 12%2 x 111;6 1.

37、 .5 .13 .13 (3) FOR ONE-TRANSMITTER INSTALLATION.-Includes one transmitter, two plugs, and one tube set as in paragraph 2b(2) of this section, plus: Quantity per Name of Unit Army Type Equipment Designation 1 Rack FT-234-A 1 Mounting FT-232-A Navy Type Designation Overall Dimensions (inches) 7 x 111

38、%i X 12%2 Weight (pounds) 1. .7 (4) FOR TWO-TRANSMITTER INSTALLATION.-Includes two transmitters, two plugs, and two tube sets as in paragraph 2b(2) of this section, plus: Quantity per I Name oj Unit I Army Type Equipment Designation Rack FT-226-A Mounting FT-227-A *Cordage and tuning shaft are suppl

39、ied in bulk. tVariable, depending upon operating requirements. 3. EQUIPMENT REQUIRED BUT NOT SUPPLIED. Navy Type Designation The following table lists the equipment required but not supplied: Quantity per Name of Unit Army Type Navy Type Equipment Designation Designation 1 Mkrophone T-17 (or T-17-B,

40、 T-17-C, T-17-D) 1 Headset HS-33 (or equal) 1 Headset Adapter MC-385-( )* 1 Storage Battery 1 Test Set RC-54-A (RC-54-B, or RC-S4-C) 1 Test Set RC-55-A (RC-5 5-B, or RC-55-C) Any issue may be used. 1-4 RESTRICTED Overall Dimensions Weight (inches) (pounds) 2. 12% x 12%2 x I11H6 .8 Required Character

41、istics For low impedance. 28-volt battery, preferably 100-ampere-hour capacity. RESTRICTED Section I AN 08 . 40SCR274 . 2 Figure J -2. Typical Radio Receiver with Adapter for Local Control Figure J -3. Typical Radio Transmitter-Front Panel RESTRICTED 1-5 Section 1 1-6 RESTRICTED AN 08-40SCR274-2 fig

42、ure 1-4. Radio Control Box BC-450-A for Three Receivers-front View figure 1-5. Radio Control Box BC-496-A for Two Receivers-front View (Left); Radio Control Box BC-473-A for one Receiver-Front View (Right) RESTRICTED RESTRICTED Section I AN 08-40SCR274-2 Figure 1-6. Rack FT -220-A and Mounting FT -2

43、21-A for .Receivers -Front View Figure J -7. Radio Control Sox SC-4SJ -A Figure 1-8. Antenna Relay Unit SC-442-A for Transmitters-Front View RESTRICTED 1 -7 Section I RESTRICTED 1-8 AN 08-40SCR274-2 Figure J -9. Rack FT -226-A and Mounting FT -227-A, for Two Transmitfers (Left); Rack FT -234-A and M

44、ounting FT -232-A for One Transmitter Right J-62 P-Sl Figure J - J O. Rack FT -33 J -A and Mounting FT -332-A for Four Transmitters RESTRICTED m n m 0 .0 Figure J - J J. Modulator Unit 8C-456-8 (Top View with Shield Removed-Also 80ttom View of Dynamotor DM-33-A l Z o com I O - nn to.)m . 0 I to.) II

45、) - o :I Section II Paragraph RESTRICTED N 08-40SCR274-2 SECTION II INSTALLATION AND ADJUSTMENT I. INSTALLATION. a. PRELIMINARY PROCEDURE. (1) COMPONENTS.-Check the list of compo nents supplied. (2) MECHANICAL INSPECTJON.-Make the following checks for obvious mechanical faults. ( a) Check the operat

46、ion of controls and dials. (b) Check the threads of receptacles and plugs. ( c) Examine the pin plug assemblies of con- nectors for bent or otherwise unserviceable units. ( d) See that proper fuses are in the modulator unit and receiver rack. ( e) See that all tubes are securely in place in their pr

47、oper sockets. (f) Test the grid clips for firmness. (3) BENCH TEST.-Make an electrical bench test of each component before installation in an air plane to insure normal operation of the equipment after installation. (See fig. 5-4.) (4) PERMANENT BENCH TEST.-When a con siderable amount of installation work is to be done, make a permanent bench test installation which con sists of: (a) Test Set RC-54-A, (RC-54-B or RC-54-C), to test the recei