MPA Logo, San Francisco Maritime National Park Association, USS Pampanito, Historic Ships at Hyde Street Pier, Education Programs Maritime Park Association Home Page Maritime Park Association Home Page Events Maritime Park Association Home Page Maritime Park Association Home Page Maritime Park Association Home Page Volunteer Membership Donate Maritime Park Association Home Page USS Pampanito Submarine Historic Ships at Hyde Street Pier Education Programs About Maritime Park Association Home Page Directions to Maritime Jobs at Maritime Facility Rental at Maritime Trustees of the Association Calendar Press Room Store Maritime Map


Photo of Radio set SCR-624 in crates.
Radio set SCR-624.

Use. - Fighter control.

Frequency range. - 100.0 to 156.0 megacycles.

Power output. - 6 watts.

Emission. - A3.

Description. - Radio set SCR-624 is a complete very high frequency radio ground station especially designed for transportation by air. Radio set SCR-624 may be operated on any one of four crystal controlled channels within the 100-156 megacycle frequency range. Control facilities are provided so that the transmitter and receiver may be operated at the station, at a remote distance of 500 feet from the station, or at a remote distance of 2 miles. Channel selection can be made only at the station or at the 500-foot remote point of control, while only send-receive communication is possible at the 2-mile remote point. Land line telephone communication is possible between any two points of control by use of telephone EE-8-A.

Tube complement:

Radio transmitter BC-625:

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.

Radio Receiver BC-624:

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.

Rectifier RA-62:

5U4G, Plate supply rectifier.
5U4G, Plate supply rectifier.
6X5GT, Bias supply rectifier.

Power supplies available:

100-130 volts, single phase, 40-60 cycles a-c.
230-260 volts, single phase, 40-60 cycles a-c.

Operating power required. - 320-325 watts.

Frequency control. - Crystal (4 pre-set channels).

Antenna. - Antenna AN-94 and the coaxial h-f cable are packed separately in order to afford suitable protection against damage to the antenna. Antenna AN-94 is a J-type antenna with a long (radiator) section and a short (matching) section mounted in a base for connection to the antenna mast. The long and short sections of the antenna are telescopic for adjusting the length to accommodate the transmitting frequency. Antenna AN-94 is supported on a 50-foot high tubular plywood mast.

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

Unit            | Type No. |    Dimensions            | Weight
                |          |    Inches                | Pounds
Chest           | CH-173-A | 34 x 16 3/4 x 13 3/4     |  134
Chest           | CH-172-A | 34 x 16 3/4 x 13 3/4     |  205
Chest           | CH-170-A | 47 1/4 x 14 3/8 x 6 3/8  |   41
Strap crate     |          | 11 x 16 1/2 x 12         |  152
Stays box       |          | 23 3/4 x 16 3/4 x 12 1/4 |  121
Spare parts box |          | 27 x 13 1/2 x 11         |   45
Power unit      | PE-75    | 36 x 19 1/2 x 26 1/2     |  322
  Total         |          |                          | 1,020


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


Copyright © 2006, Maritime Park Association
All Rights Reserved
Legal Notices and Privacy Policy
Version 2.00, 11 Sep 2006