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

[Robert Bruninga]

I had forgotten that they first have to be programmed to frequencies...
then we need to understand what kind of serial data in the data port does
what and how or what gets to the other end...


Bob

-----Original Message-----
From: aprssig <aprssig-bounces at lists.tapr.org> On Behalf Of John Gorkos
Sent: Monday, September 24, 2018 4:38 PM
To: aprssig at lists.tapr.org
Subject: Re: [aprssig] APRS on 70CM using a hundred "free" UHF radios
(Robert Bruninga)

Geez, that thread is basically a treatise on Why I Hate The Internet, and
Most Human Beings.  Just chock full o' love and help.

That being said, I just bought two of these radios on Ebay for $20.
We'll see what I can do with them.

AB0OO

On 9/24/18 12:52, John D. Hays wrote:
> https://forums.radioreference.com/motorola-forum/179932-motorola-vrm-6
> 50-a.html
>
> On Mon, Sep 24, 2018, 12:06 radio nn4qq <radio.nn4qq at gmail.com
> <mailto: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-VRM65
> 0/1311778416
>
>
>
>     On Mon, Sep 24, 2018 at 2:48 PM Ross Whenmouth <ross at topwire.co.nz
>     <mailto: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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