DAPNET: Difference between revisions

Revision as of 18:58, 27 October 2024

Revision as of 19:21, 27 October 2024

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==Technical specifications==

The recommended frequency for DAPNET is 439.9875&nbsp;MHz,<ref>[https://hampager.de/dokuwiki/doku.php?id=dapnetfrq Recommended frequencies]</ref> which is part of the [[70-centimeter band]] dedicated to amateur radio use. The transmitters are networked, some via HAMNET, some via the Internet. The standard paging protocol [[POCSAG]] is used for message transmission. For a low-power transmitter you can use [[Raspberry Pi]] with {{proper name|unipager}}<ref>[https://github.com/rwth-afu/UniPager GithubGitHub: UniPager]</ref> and MMDVM-modem<ref>[https://www.researchgate.net/publication/312934460_Development_of_a_Decentralized_Paging_Transmitter_Network Development of a Decentralized Paging Transmitter Network]</ref> installed, and to make the coverage area several miles, a radio amplifier needs to be added to its output.<ref>[https://hampager.de/dokuwiki/doku.php?id=raspager RasPager - Simple low-power Transmitter]</ref> The coverage area of the transmitter can be up to 20 km (12 miles), depending on the terrain and the height of the antenna.

==Receivers==