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Radio repeater. 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]
Redstone (rocket family) The Redstone family of rockets consisted of a number of American ballistic missiles, sounding rockets and expendable launch vehicles operational during the 1950s and 1960s. The first member of the Redstone family was the PGM-11 Redstone missile, from which all subsequent variations of the Redstone were derived.
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 distances without degradation. Many repeaters are located on hilltops or on tall buildings as the higher ...
The Evans repeating rifle is often considered to be one of the oddest rifles to ever be produced in the United States. The Evans was invented by Warren R. Evans, a dentist from Thomaston, Maine. With the help of his brother George, they perfected the rifle and started the "Evans Rifle Manufacturing Company" of Mechanic Falls, Maine in 1873.
A radio repeater retransmits a radio signal. In telecommunications, a repeater is an electronic device that receives a signal and retransmits it. Repeaters are used to extend transmissions so that the signal can cover longer distances or be received on the other side of an obstruction. Some types of repeaters broadcast an identical signal, but ...
The Columbus Module radio typically functions as the crossband voice repeater when not being used for contacts with students. The Service Module IORS radio typically is used for packet radio operations like Automatic Packet Reporting System activities or Slow-scan television events. The IORS consists of a special, modified JVCKenwood D710GA ...
The Sparta (or Redstone Sparta) was a three-stage rocket that launched Australia's first Earth satellite, WRESAT, on 29 November 1967. [ 1 ] [ 2 ] [ 3 ] Sparta used surplus American Redstone rockets as its first stage, a Thiokol Antares 2 from Scout rocket as a second stage, and a WRE BE-3 Alcyone solid-propellant engine as a third stage.
An optical communications repeater is used in a fiber-optic communications system to regenerate an optical signal. Such repeaters are used to extend the reach of optical communications links by overcoming loss due to attenuation of the optical fiber. Some repeaters also correct for distortion of the optical signal by converting it to an ...