Aircraft Radio Corporation SCR-274-N Operating Instructions Manual

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Summary of Contents for Aircraft Radio Corporation SCR-274-N

Page 2 RESTRICTED AN 08-40SCI.214-2 Published under joint authority of the United States War and Navy Departments and the Air Council of the United Kingdom. SECURITY NOTICE cated to the public or to the press, but may be given to any FOR U. S. PERSONNEL: This document contains information person known to be in the service of the United States and to affecting the national defense of the United States within the persons of undoubted loyalty and discretion who are cooperatin g...
Page 3: Table Of Contents
Receivers-Front View ....5-4. Instruction Diagram for Testing Acces- 1-5. Radio Control Box BC-496-A for two sories of Radio Set SCR-274-N ..5-7-5-8 Receivers-Front View (Left); 5-5. Radio Set SCR-274-N -Installation Di Radio Control Box BC-473-A for one mensions and Weight of Receivers, Racks Receiver-Front View (Right) ..
Page 5 RESTRICTED AN 08-40SCR274-2 �e � 3tU1e ,(/� MoieMeJ tk eOHtlxd In case it should become necessary to prevent the capture of this equipment and when ordered to do so, DE STROY IT SO THAT NO PART OF IT CAN BE SALVAGED, RECOGNIZED OR USED BY THE ENEMY.
Page 6 RESTRICTED Section I AN 08-40SCR274-2 figure ,-,. Radio Set SCR-274-N-Components RESTRICTED...
Page 7: General Description
The frequency ranges of the radio transmitters tenna loading conditions exceeds 40 watts on (fig. 1-3) of Radio Set SCR-274-N are as follows: 28 volts input.) EQUIPMENT SUPPLIED. The following table lists the equipment supplied: RECEIVING EQUIPMENT.
Page 8 Section I RESTRICTED 08-40SCR274-2 Paragraph 2 Navy Type Overall Dimensions Weight Name oj Unit Army Type Quantity per Designation (inches) (pounds) Designation Equipment FT-230-At Adapter (for remote control) Adaptt:r FT-260-A MC-237-A Control Unit PL-192 0.13 Plug (for local control) MC-211-A 0.25 Coupling F1-220-A...
Page 9: Transmitting Equipment
RESTRICTED Section I 08-40SCR274-2 Paragraph (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 Overall Dimensions Weight Equipment Designatior.
Page 10: Equipment Required But Not Supplied
Section I RESTRICTED Paragraph 3 AN 08-40SCR274-2 (2) FOR FOUR-TRANSMITTER INSTALLATION. Army Type Overall Dimen�ons Weight Quantity per Name of Unit Navy Type Designation Designation (inches) (pounds) Equipment Radio Transmitter BC-696-A 7� - 8 1%i 15� 1 each 7� 81%i 15�...
Page 11 RESTRICTED Section I AN 08 ... 40SCR274 ... 2 Figure J -2. Typical Radio Receiver with Adapter for Local Control Figure Typical Radio Transmitter-Front Panel RESTRICTED...
Page 12 RESTRICTED Section 1 AN 08-40SCR274-2 figure 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...
Page 13 RESTRICTED Section I AN 08-40SCR274-2 Figure 1-6. Rack FT -220-A and Mounting FT -221-A for .Receivers -Front View Figure J Radio Control Sox SC-4SJ -A Figure 1-8. A ntenna Relay Unit SC-442-A for Transmitters-Front View 1 -7 RESTRICTED...
Page 14 RESTRICTED Section I 08-40SCR274-2 -226-A -227-A, Figure J -9. Rack FT and Mounting FT for Two Transmitfers (Left); Rack FT -232-A and Mounting FT for One Transmitter {Right} P-Sl J-62 Figure J - J O. Rack FT -33 J -332-A and Mounting FT for Four Transmitters RESTRICTED...
Page 15 l> o� � '" '" � � � O� � '" - � � � to.) m ..0 � to.) '" '" o· :::I Figure J - J J . Modulator Unit 8C-456-8 (Top View with Shield Removed}-Also 80ttom View of Dynamotor DM-33-A...
Page 16: Installation And Adjustment
RESTRICTED Section II 08-40SCR274-2 �N Paragraph SECTION II INSTALLATION AND ADJUSTMENT (b) Keep the lead-ins inside the fuselage as I. INSTALLATION. short as possible, especially the one to the transmitter. PRELIMINARY PROCEDURE. Use Wire W-I06-A for the internal lead-in. (Insulated stranded wire may be used for the lead between the (1) COMPONENTS.-Check the list of compo...
Page 17: Cable Connections
RESTRICTED Section II AN 08-40SCR274-2 Paragraph 2 5-9.) When Antenna Relay Unit BC-442-AM is furnished the CABLE CONNECTIONS. (See fig. capacitor can be added if necessary by the use of the ( 1) Interconnection of the units can be accom HKit tor conversion of Antenna Relay Unit BC-442-AM plished by any one of three methods of wiring: to Antenna Relay Unit BC-442-A".
Page 18: Transmitter (Right)
Section II RESTRICTED Paragraph 2 AN 08-40SCR274-2 TUNING THE TRANSMITTERS. -Transmitters (15) Release the built-in telephone key by rotating must be tuned up with the "TONE-CW-VOICE" switch it in a counterclockwise direction. on Radio Control Box BC-451-A in "CW" position and (16) Mark the frequency, to which each transmit...
Page 19: Operation
OPERATION. RECEIVER OPERATION.-Operation of the re TRANSMITTER OPERATION. - Transmission ceivers of Radio Set SCR-274-N may be accomplished may be accomplished by using any of the four trans by local and remote control or just by remote control, mitters of Radio Set SCR-274-N, however, only one by either one or two operators, and with any or all of may transmit at a time.
Page 20: Emergency Operation And Repair
RESTRICTED Section III-IV AN 08-40SCR274-2 (1) FOR TONE OR CW OPERATION. CAUTION ) Set the "TRANSMITTER SELECTION" Do not key the transmitter with the built-in key, an external key, or the microphone switch switch to the desired p reset transmitting frequency in when the controls are the "VOICE"...
Page 21 RESTRICTED Section V AN 08-40SCR274-2 SECTION Y SUPPLEMENTARY DATA RESTRICTED...
Page 22: Sets Rc-54-A And Rc-55-A
Section RESTRICTED 08-40SCR274-2 TEST UNIT 1-84-A OF TEST SET RC-54-A INPUT VOLTAGE SCREEN VOLTAGE PLATE VOLTAGE 8 8 8 HEADSET HS-23 O R EO U A L lO A FUSE INPUT CURRENT CATHODE CURRENT a SPARE 0-25 � G� GAIN �...
Page 25 RESTRICTED RESTRICTED AN 08-4OSCR274-2 Section 08-40SCR274-2 1-85-A BC-451-A RADIO CONTROL TEST UNIT AN TENNA RELAY TO RACK FT - 234- BC- 442-A PL-153-A � MOOULATOR UNIT ANTENNA POST BC- 456 -A ( O N RADIO MICROPHONE T-17 TRANS""TER OR EQUAL F T -228-A GROUND BINDIN G POST O N RACK FT-234-A...
Page 26: Radio Set Scr-274-N -Installation Di Mensions And Weight Of Receivers, Racks And Mountings
1 YPICAL SIDE VIEW OF RADIO RECEIVER, RACK A N D MOUNTING (THREE RADIO RECEIVERS, ADAPTERS FT -230-A, RACK FT-220"A, MOUNTING FT-221- A SHOWNJ Figure 5-5, Radio Set SCR-274-N-Installation Dimensions and Weights of Receivers, Racks and Mountings RESTRICTED 5-9-5-10 RESTRICTED...
Page 27 REAR VIEW O F RACK AND MOUNTING (TWO TRANSMITTERS, RAOK FT- 2 26- A MO�TING (RACK FT-226-A AND MOUNTING FT - 227-A SHOWN) FT-227-A SHOWN) Radio Set SCR-274-N-lnstallation Dimensions and Weights Of figure 5-6" Transmitters, Racks and Mountings 5- 11-5-12 RESTRICTED...
Page 28: Aadio Set Scr-274-N-Installation Di Mensions And Weights Of Radio Control Boxes, Antenna Relay Unit And Modu-' Lator Unit
RADIO CONTROL BOX MOOULATOR "",T BC- 4 56-A 56 -B � � � � � � ____ ____ Figure 5-7. Radio Set SCR-274-N -Installation, Dimensions, and Weights of Radio Control Boxes, RESTRICTED Antenna Relay Unit and Modulator Unit 5-1 3-5-14...
Page 29 RESTRICTED Section V RESTRICTED 08-40SCR274-2 08-40SCR274-2 ASSEMBL Y PROCEDU RE A.ST R IP INSULATION ON END OF I '· EACH CONDUCTOR A DISTANCE OF B . TIN END O F C ONDUCTOR . C.REMOVE INSULA TOR ASSEMBLY B Y REMOVING T HE PHILLIPS SCREW . O.INDIVIDUAL WIRES SHALL B E FRONT...
Page 30: Shaft
RESTRICTED Section V RESTRICTED 08-40SCR27 4-2 08-40SCR27 4-2 1174 754 9 A S REQUIRE D SEE CR I G DETAIL BELOW 3406 6585 M 6585 STAKE ITE TO CASING BOTH E N D S OF SHAFT AS SHOWN. G USE PILOT OF WHEN STA K I SECTION B-B + .