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The NEAR warning device. The National Emergency Alarm Repeater (NEAR) was a civilian emergency warning device in the United States. It was a 2–3" (5–7.5 cm) square box designed to plug into a standard power outlet to receive a special signal sent over the electric power transmission lines.
The RC-5 protocol was developed by Philips in the early 1980s as a semi-proprietary consumer IR remote control communication protocol for consumer electronics.It was subsequently adopted by most European manufacturers, as well as by many US manufacturers of specialty audio and video equipment.
An amateur radio repeater system consisting of a 70 cm repeater and a 2-meter digipeater and iGate. Coaxial cavity RF filter at 2 meter repeater An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher power, so that the signal can cover longer ...
A radio repeater is a combination of a radio receiver and a radio transmitter that receives a signal and retransmits it, so that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of each other, to communicate. [ 1 ]
[2] [3] The Satellite consists of two units: a small infrared receiver that plugs into the console's controller ports, and a main unit that is powered by six C batteries and must have a line of sight to the receiver. [4] Both devices have four controller ports and two "Turbo" switches to simulate rapid pressing of the A and B buttons.
The R-390A military shortwave radio receiver was the result of a project undertaken by the United States Army Signal Corps in 1954 to replace the existing R-390 receiver then in use. The R-390 had done its job so well that the Corps decided continued use of this type of receiver necessitated an improved, reduced-cost version.
The organization that led to the Military Auxiliary Radio System was called the Auxiliary Amateur Radio System (AARS). AARS was created in November 1925 by a few dedicated pioneers in the United States Army Signal Corps led by Captain Thomas C. Rives. The United States recognized radio as a critical mode of communication during World War I.
The first relay system with radio repeaters, which really functioned, was that invented in 1899 by Emile Guarini-Foresio. [2] A radio repeater usually consists of a radio receiver connected to a radio transmitter. The received signal is amplified and retransmitted, often on another frequency, to provide coverage beyond the obstruction.