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[[File:DAPNET-logo.png|thumb|right|DAPNET logo]]
'''DAPNET''' (Decentralised Amateur Paging Network) is a free global paging network created and maintained by [[amateur radio]] enthusiasts. Messages can be received on commercially available [[pager]]s that support the [[POCSAG]] protocol and are tuned to the appropriate [[Radio frequency|frequency]].
[[File:Ham-pager.jpg|thumb|right|DAPNET as of July 2023]]
==History==
TheA projectsimilar washam originallyradio project called FunkrufMaster<ref> was quite popular around 2000. It was based on [https://ham-pager[AX.sourceforge.net25]]-technology sourceforgeand the former Packet Radio Network.net:hamBecause of the upcoming HAMNET-pager]</ref> and was[[Internet createdProtocol|IP-Protocol]] inera, Germanya bysuccessor thewas initiativeneeded. Members of the staffham ofradio theactivity group at [[RWTH Aachen University]] designed and developed '''DAPNET''' from scratch as a modern software approach. <ref>[{{Cite web |url=https://www.ralfwilke.com/index.php/en/about-me |title=Ralf Wilke - About]</ref>In|access-date=2023-07-21 2016, the name was|archive-date=2023-07-21 changed to Funkrufmaster 2|archive-url=https://web.0archive.org/web/20230721225846/https://www.ralfwilke.com/index.php/en/about-me and|url-status=dead then to DAPNET.}}</ref> As of March 2018, over 90 transmitters were already in permanent operation, and the coverage area included parts of [[Germany]], the [[Netherlands]], [[Belgium]], and [[Switzerland]].,<ref>[https://hampager.de/dokuwiki/doku.php?id=dapnetoverview DAPNET Overview]</ref> with [[Raspberry Pi]]-based personal hotspots extending coverage around the world.<ref>https://hampager.de/dokuwiki/doku.php?id=mmdvm</ref>
==Technical specifications==
The recommended frequency for DAPNET is 439.9875 MHz,<ref>[https://hampager.de/dokuwiki/doku.php?id=dapnetfrq Recommended frequencies]</ref> which is 12.5 kHz below the upper limitpart of the [[70-cmcentimeter band]] dedicated to amateur radio banduse. 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, youa needradio toamplifier addneeds ato be radioamplifieradded 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 1220 mileskm (2012 kmmiles), depending on the terrain and the height of the antenna.
==Receivers==
Skyper and AlphapocAlphaPOC pagers are particularly popular for receiving messages. They can be easily tuned to the desired reception frequency and also offer many other possibilities, such as receiving bulletins - messages sent to all recipients. However, other brands of pagers can be customized accordingly or [[Flipper Zero]] can be used.
Messages can be sent via a multilingual website as well as [[Android (operating system)|Android]] and [[iOS]] apps.
