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The Radio tractor was a mobile
At least 3 variants are known:
* Radio Tractor No. 1
* Radio Tractor No. 2 (
* Annual Report 191
page 249 * 1918 Military Signal Corps manua
* New York Times 191
* Electrical world vol. 6
* The Wireless Ag
* Automobile journal Vol. 3
* https://web.archive.org/web/20121012130248/http://www.nsa.gov/public_info/_files/cryptologic_spectrum/umbrellas.pdf
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."
...
used by the U.S. 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, cl ...
for ground communications before and during 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 ...
. Prior to World War I, trucks were referred to as "tractors", and there were also telegraph tractors, and telephone tractors.
Use
Very little information exists for these trucks, as most of the components were built before standardization. They first made their debut on theMexican border
Mexico shares international borders with three nations:
*To the north the United States–Mexico border, which extends for a length of through the states of Baja California, Sonora, Chihuahua, Coahuila, Nuevo León and Tamaulipas.
*To the southe ...
in a radio intercept role, and later during World War I, some sets may have been reconfigured for RDF and other uses.
Components
* SCR-50, 2 kilowattspark transmitter
A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark."Radio Transmitters, Early" in Spark-gap transmitters were the first type of radio transmitter, and were the main type used ...
, crystal
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macro ...
or vacuum tube
A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
The type known as ...
detector
A sensor is a device that produces an output signal for the purpose of sensing a physical phenomenon.
In the broadest definition, a sensor is a device, module, machine, or subsystem that detects events or changes in its environment and sends ...
receiver, 0.15-0.50 Megahertz
Variants
At least 3 variants are known:
* Radio Tractor No. 1
* Radio Tractor No. 2 (Four Wheel Drive
Four-wheel drive, also called 4×4 ("four by four") or 4WD, refers to a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, and is typically linked via a transfer cas ...
)(Jeffery Quad
The Jeffery Quad, also known as the Nash Quad or Quad is a four-wheel drive, 1-ton rated truck that was developed and built by the Thomas B. Jeffery Company from 1913 in Kenosha, Wisconsin, and after 1916 by Nash Motors, which acquired the Jeffer ...
), Unknown radio set
* Radio Tractor No. 3 (White Motor Company
The White Motor Company was an American automobile, truck, bus and agricultural tractor manufacturer from 1900 until 1980. The company also produced bicycles, roller skates, automatic lathes, and sewing machines. Before World War II, the comp ...
), SCR-50 radio set
The No.3 truck was also accompanied by a tender "Maintenance truck No. 5" later renumbered as K-5.
See also
{{Portal, World War I *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."
...
* SCR-108
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 t ...
* Crystal radio
* List of U.S. Signal Corps vehicles
This is a list of vehicles used by the U.S. Army Signal Corps from World War I through World War II.
Designations
Vehicles specifically designed or adapted for the Signal Corps were initially designated by a "K" number. The K-number was later ph ...
References
* Signal Corps Storage Catalo* Annual Report 191
page 249 * 1918 Military Signal Corps manua
* New York Times 191
* Electrical world vol. 6
* The Wireless Ag
* Automobile journal Vol. 3
* https://web.archive.org/web/20121012130248/http://www.nsa.gov/public_info/_files/cryptologic_spectrum/umbrellas.pdf
External links
* https://web.archive.org/web/20100413132056/http://www.gordon.army.mil/ocos/museum/equipment.asp scr and bc lists Amateur radio transmitters Military radio systems of the United States World War I American electronics Military electronics of the United States Radio during World War I