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A practical spark gap transmitter consists of these parts: [11] [13] [14] [15] A high-voltage transformer, to transform the low-voltage electricity from the power source, a battery or electric outlet, to a high enough voltage (from a few kilovolts to 75-100 kilovolts in powerful transmitters) to jump across the spark gap. The transformer ...
The company was founded in 1923 by Edgar F. Johnson and his wife Ethel Johnson. The company began as a mail order business, selling radio transmitting parts to amateurs and early radio broadcasters from space shared with a woodworking shop located in downtown Waseca. In 1936, E.F. Johnson Co. built its first factory and office building in ...
Electrical codes require such exposed high voltage equipment to be fenced off from the public, so the mast and antenna tuning hut are surrounded by a locked fence. Usually a chain-link fence is used, but sometimes wooden fences are used to prevent currents induced in a metallic fence from distorting the radiation pattern of the antenna. An ...
In a single receiver residential installation there is a single coaxial cable running from the receiver set-top box in the building to the LNB on the dish. The DC electric power for the LNB is provided through the same coaxial cable conductors that carry the signal to the receiver.
Several such coils with a few stakes to secure them in place are just as effective as an ordinary barbed wire fence, which must be built by driving stakes and running multiple wires between them. A platoon of soldiers can deploy a single concertina fence at a rate of about a kilometre (5 ⁄ 8 mile) per hour. Such an obstacle is not very ...
Buddy box or buddy boxing is a colloquialism referring to two R/C aircraft radio systems joined together for pilot training purposes. [1]This training system is universal among the six major R/C radio manufacturers (Spektrum, Futaba, JR, Hitec, Sanwa/Airtronics and KO Propo) which means that transmitters do not have to be the same brand in order to be joined via an umbilical cable.
A modern HF transceiver with a spectrum analyzer and DSP capabilities. The transceiver first appeared in the 1920s. [citation needed] Before then, receivers and transmitters were manufactured separately and devices that wanted to receive and transmit data required both components.
Wireless Set No. 10 – 8 channel multiplexed microwave transmitter/receiver. [4] Wireless Set No. 11 – Replacement for No. 1. Used by the likes of the Long Range Desert Group during WW2. Replaced by No. 19. Wireless Set No. 12 – Static or vehicle mounted transmitter station, range about 60 miles (~96 km). Wireless Set No. 17 – 2-valves ...