View source for SCR-108

{{Short description|US Army radio truck}}
{{Infobox weapon
|name=SCR-108 Radio Truck
| image= Signal Corps Radio Truck 1920.jpg
| image_size = 300
|caption=
|origin= United States
|type= Radio truck
<!-- Service history -->
|service= 1920-?
|used_by=[[US Army]]
|wars=[[World War I]] ?
<!-- Production history -->
|designer=
|design_date= 1919
|manufacturer=[[White Motor Company]]
|unit_cost=
|production_date=
|number=
|variants=1
|is_vehicle=yes
|length= 120 inches
|width= 64 inches
|height=64 inches
|weight=1 1/2 ton
|suspension=
|speed=
|vehicle_range=
|primary_armament=none
|armour=none
|engine=
|engine_power=
|pw_ratio=
|crew=4
}}
The '''SCR-108 Radio Truck''' was a [[Signal Corps Radio]] vehicle used by the [[United States Army]] during and after [[World War I]] for short range air-to-ground communications,
==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 one 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 six volt circuit is provided for two lamps connected to storage batteries, and a 110 volt circuit  with two lamps is provided if there is an external power source available.
==Components==
(Note- all sets seem to have been upgraded to an A model)
[[File:Signal Corps SCR-54A crystal radio.jpg|thumb|200px|right|SCR-54]]
* [[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==
[[File:SCR-108 radio truck.jpg|thumb|200px|right|SCR-108 Radio truck]]
[[File:SCR-124 Truck.jpg|thumb|200px|right|SCR-124 Radio Truck]]
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
==See also==
* [[Radio Tractor]]
* [[Signal Corps Radio]]
* [[Crystal radio]]
==References==
* Signal Corps Storage Catalog [https://books.google.com/books?id=WgKAfBPtDL8C&dq=scr+54+radio&pg=PA33]
* Radio Communication Pamphlet No. 3 (SCR-54) [https://books.google.com/books?id=LSxJAQAAIAAJ&dq=scr+54+radio&pg=RA1-PA29]
* Radio Communications Pamphlet No. 17 (SCR-79)[https://books.google.com/books?id=LSxJAQAAIAAJ&dq=scr+54+radio&pg=RA1-PA29]
* Radio Communications Pamphlet No. 22 (SCR-67)
==External links==
* https://web.archive.org/web/20100413132056/http://www.gordon.army.mil/ocos/museum/equipment.asp scr and bc lists
* Annual report [https://books.google.com/books?id=VBE_AAAAYAAJ&dq=scr-108+radio&pg=PA259]
* 1922 Congressional hearing [https://books.google.com/books?id=IA49AAAAYAAJ&dq=scr-124+truck&pg=PA210]
[[Category:Amateur radio transmitters]]
[[Category:Military radio systems of the United States]]
[[Category:Military vehicles introduced in the 1920s]]
[[Category:Military electronics of the United States]]