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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 ...
The Western Union company used the term simplex when describing the half-duplex and simplex capacity of their new transatlantic telegraph cable completed between Newfoundland and the Azores in 1928. [4] The same definition for a simplex radio channel was used by the National Fire Protection Association in 2002. [5]
For example, in US two-way radio, 30–50 MHz is one band and 150–174 MHz is another. A repeater with an input of 33.980 MHz and an output of 46.140 MHz is a same band repeater. In same band repeaters, a central design problem is keeping the repeater's own transmitter from interfering with the receiver.
Initially, it used half-watt hand-held FM UHF radios with 14 fixed channels near 462 and 467 MHz. For a time dual-standard FRS and General Mobile Radio Service (GMRS) radios were available, that could be operated without individual licensing on the FRS channels, but which required a license to operate on the GMRS frequencies at a power level ...
Repeater equipment: GMSK Node Adapter - these devices are hardware GMSK modems with firmware to take D-STAR protocol frames over a USB cable and provide the necessary logic and GMSK modulation to control a simplex node or a full duplex repeater. One repeater that is easily adaptable is the Kenwood TKR-820 as documented by K7VE. [27]
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This was a windfall for amateur radio enthusiasts, allowing access to fairly inexpensive radios which could easily be modified for use in the 10 meter band. American Novice and Technician class licensees were granted CW and SSB segments on the 10 meter band as of 21 March 1987.