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

[John D. Hays]

https://forums.radioreference.com/motorola-forum/179932-motorola-vrm-650-a.html

On Mon, Sep 24, 2018, 12:06 radio nn4qq <radio.nn4qq at gmail.com> wrote:

> This EBAY post includes a few pictures
>
>
> https://www.ebay.com/p/Motorola-VRM-650-Data-Mobile-Radio-F3454a-VRM650/1311778416
>
>
>
>
> 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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>>
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