ARLA/CLUSTER: Apresentado o novo Modo Digital NPR - New Packet Radio mode

[João Costa > CT1FBF]

A new digital mode for radio amateurs

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 or SSB with a few old-timers using AM, and
you’d hear the warbling tones of RTTY traffic generated by mechanical
teletypes.

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

NPR 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.

Whether or not the mode is taken up and becomes a success depends upon the
will of individual radio amateurs. But it does hold the interesting feature
of relying upon relatively inexpensive parts, so the barrier to entry is
lower than it might be otherwise. If you are wondering where you might have
seen [F4HDK] before, we’ve previously brought you his FPGA computer.

Read the full Hackaday article:
https://hackaday.com/2019/03/31/a-new-digital-mode-for-radio-amateurs/
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