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RFinder's main service is the World Wide Repeater Directory (WWRD), which is a directory of amateur radio repeaters. RFinder is the official repeater directory of several amateur radio associations. RFinder has listings for several amateur radio modes , including FM , D-STAR , DMR , and ATV .
Reflectors are a type of conferencing system. Most reflectors on the network have 10 channels (0–9) with channel 0 being the main channel. Each reflector has a unique 4 digit node number in the range of 9000–9999. The first 3 digits consist of the reflector number, while the fourth digit represents the channel number.
An SSTV repeater is an amateur radio repeater station that relays slow-scan television signals. A typical SSTV repeater is equipped with a HF or VHF transceiver and a computer with a sound card, which serves as a demodulator/modulator of SSTV signals. SSTV repeaters are used by amateur radio operators for exchanging pictures.
APRS data can be displayed on a map, which can show stations, objects, tracks of moving objects, weather stations, search and rescue data, and direction finding data. APRS data is typically transmitted on a single shared frequency (depending on country) to be repeated locally by area relay stations (digipeaters) for widespread local consumption.
Reporting networks such as PSK Reporter allow researchers in near real time to evaluate space weather conditions, particularly changes in the earth's ionosphere. [14] [15] There are multiple examples of PSK Reporter being used to aid researchers as well as aiding in the prediction and understand of radio propagation.
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Some repeaters have automatic call sign transmission at regular intervals and use the secondary suffix /R at the call sign's end. Some jurisdictions discourage this practice on the grounds that it could be confused with an amateur from the repeater's location working portable in Russia.
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