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The SCR-108 Radio Truck was a
* 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
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
* Radio Communication Pamphlet No. 3 (SCR-54
* Radio Communications Pamphlet No. 17 (SCR-7
* Radio Communications Pamphlet No. 22 (SCR-67)
* 1922 Congressional hearin
Amateur radio transmitters Military radio systems of the United States Military vehicles introduced in the 1920s
Signal Corps Radio
Signal Corps Radios were U.S. Army military communications components that comprised "sets". Under the Army Nomenclature System, the abbreviation SCR initially designated "Set, Complete Radio", but was later misinterpreted as "Signal Corps Radio."
...
vehicle used by the United States Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cla ...
during and after World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
for short range air-to-ground communications,
Use
This truck was assigned to squadron headquarters in order to communicate with theSCR-68 The SCR-68 ( SCR was a military term meaning Set, Complete, Radio) was a military radiotelephone used by the US Army Signal Corps as an aircraft radio in the waning months of World War I.Stoller, H. M Engineering Dept, Western Electric Company, Inc. ...
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)
* 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
See also
{{Portal, World War I * Radio Tractor *Signal Corps Radio
Signal Corps Radios were U.S. Army military communications components that comprised "sets". Under the Army Nomenclature System, the abbreviation SCR initially designated "Set, Complete Radio", but was later misinterpreted as "Signal Corps Radio."
...
* Crystal radio
A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio signal to produce sound, needing no external power. It is named for its most impo ...
References
* Signal Corps Storage Catalo* Radio Communication Pamphlet No. 3 (SCR-54
* Radio Communications Pamphlet No. 17 (SCR-7
* 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 repor* 1922 Congressional hearin
Amateur radio transmitters Military radio systems of the United States Military vehicles introduced in the 1920s