SCR-508 Knowpia

SCR-508
SCR-508
	SCR-528 in M29 Weasel
Type	Vehicle Radio
Place of origin	United States
Service history
In service	1941-1958
Used by	US Army
Wars	World War II, Korean War
Production history
Designed	1940
Produced	July 1941
Variants	2
Specifications

The SCR-508 radio was a mobile Signal Corps Radio used by the U.S. Army during World War II, for short range ground communications. The SCR-508 series radio represented the Army's commitment to both FM and crystal tuning, and was used extensively by armor and mechanized units. The turret bustle of late series light and medium tanks was designed around this radio.^[1]^[2]

Use edit

The SCR-508 series was standardized on 22 July 1941, and used by armored forces for command and control of tank units. It replaced the earlier SCR-293 and SCR-245 and was used primarily in the M5 Stuart light tanks as well as the M4 Sherman medium tanks. It also provided the intercom system to all crew stations. It provided voice communications between tanks and other vehicles/units equipped with FM radios (such as the SCR-510 and others) operating in the same frequency range. One of 10 channels could be selected by the operator, a total of 80 channels were available for use at 100 kHz channel spacing. Channels were referred to by a numerical identifier. For example, 27.100 MHz was "channel 271", 25.000 MHz was "channel 250" and so on. It was replaced by the AN/VRC-8 series radios.^[3]

Components edit

BC-604 transmitter (FM, CW/voice), 10 crystal controlled channels 20.0 MHz to 27.9 MHz, 25 watts, range 7 mi (11 km)
- DM-35 dynamotor (12 Volt input) or
- DM-37 dynamotor (24 Volt)
BC-603 receiver (2 for 508 set)
- DM-34 dynamotor (12 volt input) or
- DM-36 dynamotor (24 volt)
FT-237 mount or rack
CH-74 cabinet for use in open command vehicles (FT-284 Legs)
MP-52 mast base for CH-74
MP-48 antenna base, and 9 ft (2.7 m) whip antenna
CH-264 chest for parts and accessories (could be slid into mount in place of receiver)
T-17 microphone
HS-30 headset
RM-29 telephone patch set
BC-606 intercom box, at crew stations
I-208 signal generator (TM 11-317)

Variants edit

Different combinations of components could be arranged in the mounts.

SCR-528 transmitter and single receiver
SCR-538 Receiver and BC-605 Amplifier (for intercom)
AN/VRC-5 Separately mounted transmitter and receiver
- FT-508 mount (transmitter)
- FT-345 mount (receiver)

The Artillery branch used the same radios mirroring the SCR-508 series but with a different frequency range

SCR-608
- BC-684 transmitter 27.0 MHz to 38.9 MHz at 35 watts, for 15 mi (24 km)
- BC-683 receiver
SCR-628

References edit

^ Thomas Berndt (1994). American Tanks of World War II. Zenith Imprint. pp. 54–. ISBN 978-1-61060-700-1.
^ R. P. Hunnicutt (1992). A History of the American Light Tank: Stuart. Presidio. ISBN 978-0-89141-462-9.
^ Yeide, Harry. Weapons of the Tankers. Zenith Imprint. pp. 55–. ISBN 978-1-61060-778-0.