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

[Michael Barnes]

Programming these things will be the problem. You will need a Radio
Interface Box (RIB) to connect the radio to a computer. Then you will need
the Motorola RSS software (pricey and limited availability) to configure
the radios. There are tons of these radios on eBay for $5-$50. Unless you
have the RIB and proprietary software, all you have are conversation pieces
and doorstops. I've fought this battle with Motorola equipment numerous
times over the years.

Michael WA7SKG


On Mon, Sep 24, 2018 at 1:51 PM Robert Bruninga <bruninga at usna.edu> wrote:

> 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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> >
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> >
> >
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