[aprssig] APRS on 70CM using a hundred "free" UHF radios (Robert Bruninga)

radio nn4qq radio.nn4qq at gmail.com
Mon Sep 24 15:05:10 EDT 2018

This EBAY post includes a few pictures


On Mon, Sep 24, 2018 at 2:48 PM Ross Whenmouth <ross at topwire.co.nz> wrote:

> The VRM650 is an RD-LAP machine, configured ex-factory for either 9.6 or
> 19.2 kbps (12.5 or 25 kHz channelisation respectively).
> I don't know enough about RD-LAP, but presumably, you will be able to
> encapsulate AX.25 packets inside of RD-LAP packets?
> If the amateur community gets enough of these radios to make it worth
> while, it is probably within the realms of feasibility (with considerable
> effort) to reverse engineer the VRM650 and write a "ham" firmware for it
> "from scratch" which speaks AX.25 (and doesn't have copyright issues with
> Motorola service software)
> 73
> Ross Whenmouth ZL2WRW
> Apparently the Motorola VRM650 UHF data radio should be available for
> almost free by the hundreds.
> These are Motorola VRM650 modems which I think are a 40 Watt MCS2000 radio
> with a different faceplate and only a DB9 rs232 port.
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