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RADIO SETS SCR-522 AND SCR-542 (FOR SCR-528, SEE SCR-510)


Radio set SCR-522 - principal components.
Radio set SCR-522 - principal components.

Use. - Ground-air liaison.

Frequency range. - 100 to 156 megacycles.

Power output. - 6 watts.

Emission. - A3 and special tone signal when used with contactor equipment RC-96.

Description. - Radio sets SCR-522 and SCR-542 are intended for use in aircraft and will provide two-way radio-telephone communication between aircraft in flight and between aircraft and ground stations. Operation may take place on any one of four crystal-controlled channels lying within the frequency range of 100 to 156 megacycles. Remote control only is provided. Radio set SCR-522 operates from a 28-volt source and uses dynamotor PE-94-A ; radio set SCR-542 operates from a 14-volt source and uses dynamotor PE-98- A. Radio sets SCR-522 and SCR-542 differ only in the primary power supply voltage and the dynamotor unit used.

Tube complement:

Receiver:
12J5GT, Second audio amplifier.
12C8, Detector, avc, and first audio amplifier.
9002, Harmonic generator.
9003, R-F amplifier.
9003, Mixer.
9003, Harmonic amplifier.
12AH7GT, Oscillator and audio squelch.
12SG7, First i-f amplifier.
12SG7, Second i-f amplifier.
12SG7, Third i-f amplifier.

Transmitter:
832, Second harmonic amplifier.
832, Power amplifier.
12A6, First harmonic amplifier.
12A6, Modulator.
12A6, Modulator.
6G6G, Oscillator.
6SS7, Speech amplifier.
6SS7, R-F indicator diode.

Frequency control. - Crystal (four pre-set channels in the receiver and four in the transmitter).

Power supplies available:

SCR-522: 28 volts d.c.
SCR-542: 14 volts d.c.

Operating power:

SCR-522: Transmit-11.5 amperes at 28 volts; Receive 11.1 amperes at 28 volts.
SCR-542: Transmit-23.0 amperes at 14 volts; Receive 22.2 amperes at 14 volts.

Antenna. - A quarter-wave vertical mast.

Weights, dimensions, and Army type numbers of principal equipment units


Unit                  | Type No.|        Dimensions              | Volume | Weight
                      |         |         Inches                | Cubic  | Pounds
Case CS-80 containing:|         |                                |        | Feet
  Radio Transmitter   | BC-625  | \                              |        |
  Radio Receiver      | BC-624  | | 16 5/32 x 12 9/16 x 10 11/16 |        | 49
  Rack                | FT-244  | /                              |        |
Dynamotor             | PE-94-A |   12 25/32 x 8 27/32 x 6 15/64 |        | 37
Dynamotor             | PE-98-A |   12 25/32 x 8 27/32 x 6 15/64 |        | 37
Radio Control box     | BC-602  |   5 7/8 x 5 9/16 x 2 1/2       |        | 2.4
Total weight          |         |                                |        | 91
Total volume          |         |                                | 1.8    |

REFERENCES:

The information enclosed here is excerpted from:
Catalogue of Naval Electronic Equipment-April 1946- NavShips 900,116.

 

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Version 2.00, 11 Sep 2006