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A type of system known as a simplex repeater uses a single transceiver and a short-duration voice recorder, which records whatever the receiver picks up for a set length of time (usually 30 seconds or less), then plays back the recording over the transmitter on the same frequency. A common name is a "parrot" repeater.
Each gateway consists of a dedicated computer running custom software that is connected to both a radio and the Internet. This arrangement forms what is known as an IRLP Node. Since all end users communicate using a radio as opposed to using a computer directly, IRLP has adopted the motto "Keeping the Radio in Amateur Radio".
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 .
Despite all these advantages, few implementations have been updated to include these improvements published more than 20 years ago. The only known complete implementation of v2.2, at this time (2020), is the Dire Wolf software TNC. [3] AX.25 is commonly used as the data link layer for network layer such as IPv4, with TCP used on top of that.
For example, a fire department in Colorado was on a 46 MHz channel while a police department was on a 154 MHz channel, they built a cross-band repeater to allow communication between the two agencies. If one of the systems is simplex, the repeater must have logic preventing transmitter keying in both directions at the same time.
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Simplex channel, worldwide calling FM: 29.600 MHz Secondary simplex is 29.500 Japan and others use 29.00 to 29.40 FM simplex. 10kHz steps from 29.0 to 29.1 and 20kHz steps 29.2 to 29.40 with 29.30 a national simplex channel in Japan.
Prody Parrot is a desktop assistant computer program made for the Windows 9x and Windows NT series of operating systems. It was created by Mindmaker in 1999, [ 1 ] and acted to help computer users in business environments, whilst still having the facilities to engage and entertain users at home PCs.