Despite what the article starts out saying, amateur radio has by no means stood still - it has progressed through AM, FM, SSB, RTTY, Wires, Echolink, DMR, bouncing signals off the moon, repeaters, relaying via orbiting satellites, Winlink, and way more. So just ignore that paragraph and move to the meat.
Guillaume, F4HDK has come up with NPR, or New Packet Radio mode, which is intended to bring high bandwidth IP networking to radio amateurs in the 70 cm band, and it does this rather cleverly with a modem that contains a single-chip FSK transceiver intended for use in licence-free ISM band applications. There is an Ethernet module and an Mbed microcontroller board on a custom PCB, which when assembled produces a few hundred milliwatts of RF that can be fed to an off-the-shelf DMR power amplifier.
Each network is configured around a master node intended to use an omnidirectional antenna, to which individual nodes connect. Time-division multiplexing is enforced by the master so there should be no collisions, and this coupled with the relatively wide radio bandwidth of the ISM transceiver gives the system a high usable data bandwidth.
The claim to fame is: IP over 430MHz Ham Radio, up to 500kbps, 20W RF, Extension for HSMM-Hamnet. 100% open-source.
What is really new here is the higher usable data bandwidth as up to now it has been fairly slow and more suited to slow scan TV, e-mail, ext, etc. Like it or not (every new thing introduced in amateur radio is often criticised as just not being cricket) digital is evolving rapidly but my biggest worry with digital is the differing standards and it is often Internet-based services offering compatibility. If we lose the Internet will our radios still communicate? We'd better make sure we keep FM, AM, SSB etc healthy and functional. That said this will still be useful in the field where a DMR radio is used, can transmit and receive this data than via a DMR repeater and the Internet. No Internet means a localised service only.
See hackaday.com/2019/03/31/a-new-…
#DMR #amateurradio #hamradio
from Beiträge von Danie van der Merwe https://ift.tt/2TPWUyF
via IFTTT
Guillaume, F4HDK has come up with NPR, or New Packet Radio mode, which is intended to bring high bandwidth IP networking to radio amateurs in the 70 cm band, and it does this rather cleverly with a modem that contains a single-chip FSK transceiver intended for use in licence-free ISM band applications. There is an Ethernet module and an Mbed microcontroller board on a custom PCB, which when assembled produces a few hundred milliwatts of RF that can be fed to an off-the-shelf DMR power amplifier.
Each network is configured around a master node intended to use an omnidirectional antenna, to which individual nodes connect. Time-division multiplexing is enforced by the master so there should be no collisions, and this coupled with the relatively wide radio bandwidth of the ISM transceiver gives the system a high usable data bandwidth.
The claim to fame is: IP over 430MHz Ham Radio, up to 500kbps, 20W RF, Extension for HSMM-Hamnet. 100% open-source.
What is really new here is the higher usable data bandwidth as up to now it has been fairly slow and more suited to slow scan TV, e-mail, ext, etc. Like it or not (every new thing introduced in amateur radio is often criticised as just not being cricket) digital is evolving rapidly but my biggest worry with digital is the differing standards and it is often Internet-based services offering compatibility. If we lose the Internet will our radios still communicate? We'd better make sure we keep FM, AM, SSB etc healthy and functional. That said this will still be useful in the field where a DMR radio is used, can transmit and receive this data than via a DMR repeater and the Internet. No Internet means a localised service only.
See hackaday.com/2019/03/31/a-new-…
#DMR #amateurradio #hamradio
from Beiträge von Danie van der Merwe https://ift.tt/2TPWUyF
via IFTTT
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