{"id":491,"date":"2019-04-01T07:05:03","date_gmt":"2019-04-01T06:05:03","guid":{"rendered":"https:\/\/pi4zlb.vrza.nl\/wp\/?p=491"},"modified":"2019-04-01T07:05:03","modified_gmt":"2019-04-01T06:05:03","slug":"a-new-digital-mode-for-radio-amateurs","status":"publish","type":"post","link":"https:\/\/pi4zlb.vrza.nl\/wp\/2019\/04\/01\/a-new-digital-mode-for-radio-amateurs\/","title":{"rendered":"A New Digital Mode For Radio Amateurs"},"content":{"rendered":"\n
\"\"\/<\/figure>\n\n\n\n

There used to be a time when amateur radio was a fairly \nstatic pursuit. There was a lot of fascination to be had with building \nradios, but what you did with them remained constant year on year. Morse\n code was sent by hand with a key, voice was on FM or SSB with a few \nold-timers using AM, and you\u2019d hear the warbling tones of RTTY traffic \ngenerated by mechanical teletypes.<\/p>\n\n\n\n

By contrast the radio amateur of today lives in a fast-paced world of\n ever-evolving digital modes, in which much of the excitement comes in \npushing the boundaries of what is possible when a radio is connected to a\n computer. A new contender in one part of the hobby has come our way \nfrom [Guillaume, F4HDK], in the form of his NPR, or New Packet Radio mode<\/a>.<\/p>\n\n\n\n

NPR is intended to bring high bandwidth IP networking to radio \namateurs in the 70 cm band, and it does this rather cleverly with a \nmodem that contains a single-chip FSK transceiver intended for use in \nlicence-free ISM band applications. There is an Ethernet module and an \nMbed microcontroller board on a custom PCB, which when assembled \nproduces a few hundred milliwatts of RF that can be fed to an \noff-the-shelf DMR power amplifier.<\/p>\n\n\n\n

Each network is configured around a master node intended to use an \nomnidirectional antenna, to which individual nodes connect. \nTime-division multiplexing is enforced by the master so there should be \nno collisions, and this coupled with the relatively wide radio bandwidth\n of the ISM transceiver gives the system a high usable data bandwidth.<\/p>\n\n\n\n

Whether or not the mode is taken up and becomes a success depends \nupon the will of individual radio amateurs. But it does hold the \ninteresting feature of relying upon relatively inexpensive parts, so the\n barrier to entry is lower than it might be otherwise. If you are \nwondering where you might have seen [F4HDK] before, we\u2019ve previously \nbrought you his FPGA computer<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

There used to be a time when amateur radio was a fairly static pursuit. There was a lot of fascination to be had with building radios, but what you did with them remained constant year on year. Morse code was sent by hand with a key, voice was on FM \u2026<\/p>\n

Lees verder<\/i><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-491","post","type-post","status-publish","format-standard","hentry","category-hackaday"],"_links":{"self":[{"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/posts\/491","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/comments?post=491"}],"version-history":[{"count":1,"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/posts\/491\/revisions"}],"predecessor-version":[{"id":492,"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/posts\/491\/revisions\/492"}],"wp:attachment":[{"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/media?parent=491"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/categories?post=491"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pi4zlb.vrza.nl\/wp\/wp-json\/wp\/v2\/tags?post=491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}