SCR-108
The SCR-108 Radio Truck was a mobile Signal Corps Radio used by the United States Army during and after World War I for short range air-to-ground communications,
| SCR-108 Radio Truck | |
|---|---|
 | |
| Type | Radio truck |
| Place of origin | United States |
| Service history | |
| In service | 1920-? |
| Used by | US Army |
| Wars | World War I ? |
| Production history | |
| Designed | 1919 |
| Manufacturer | White Motor Company |
| Variants | 1 |
| Specifications | |
| Mass | 1 1/2 ton |
| Length | 120 inches |
| Width | 64 inches |
| Height | 64 inches |
| Crew | 4 |
| Armor | none |
Main armament | none |
Use
This truck was assigned to squadron headquarters in order to communicate with the SCR-68 airplane radio as well as the others in its class. eventually replaced by the SCR-197 mobile radio station. The van is described as having room for 3 operators and one squadron radio officer. One bench supports the SCR-67, SCR-54, and 1 amplifier with storage batteries held by clamps underneath the bench. on another bench is the SCR-79. a desk for the officer is installed with batteries underneath. a 6 volt circuit is provided for 2 lamps connected to storage batteries, and a 110 volt circuit with 2 lamps is provided if there is an external power source available.
Components
(Note- all sets seem to have been upgraded to an A model)
- SCR-54 Receiver- (BC-14), Crystal detector; inductively coupled; tuned primary and secondary; 150 foot inverted L antenna; wavelength range, 200 to 600 meters (500 kHz - 1500 kHz)
- SCR-67 Radiotelegraph- (BC-13), transmitting and receiving; for ground stations; has 1 oscillator, 1 modulator, 1 detector, and 2 amplifier vacuum tubes; wavelength range transmitting 250 to 450 meters (600 kHz - 1200 kHz), and receiving 200 to 600 meters (500 kHz - 1500 kHz).
- SCR-79 Radiotelegraph- (BC-25), transmitting and receiving; consists of an electrostatically coupled vacuum tube oscillator circuit for transmitting, and a vacuum tube detector and 2 stage amplifier for receiving; requires a low resistance antenna. wavelength is 500 to 1.100 meters (250 kHz - 600 kHz)
- SCR-121 Amplifier- (BC-44), 2 stage vacuum tube audio amplifier using iron core transformers
Variants
The SCR-124 was evidently housed in a similar truck, and was assigned to division and Corps level headquarters. it carried the following components-
- SCR-99 Radiotelegraph
- SCR-121
- SCR-54
- SCR-82 battery charger (replaced by SCR-110)
- SCR-79.
- SCR-97 Radiotelephone
References
External links
- https://web.archive.org/web/20100413132056/http://www.gordon.army.mil/ocos/museum/equipment.asp scr and bc lists
- Annual report
- 1922 Congressional hearing