PR networks allow regional, national and even intercontinental delivery of e-mail and other data transfer, but restricted to radio amateurs. TCP/IP is also in use on packet radio, allowing the use of all the high-level protocols like HTTP or FTP known from the internet.
Each PR station consists of at least one transceiver with antenna and one TNC[?] (Terminal Node Controller). Normal PR stations also have a terminal (which may be emulated by a computer), to allow operator interaction with the TNC, but automatic PR stations do not need a terminal.
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