Re: [Discuss-gnuradio] First project: Garmin Rino GPS/FRS/GMRS?

[Martin Braun]

Kevin,

I don't think there's anyone doing this. In general, I recommend 
checking the PyBOMBS recipe list which contains a lot of active projects.

For how to start, that depends a lot on your comfort level doing 
wireless comms and DSP. Do you have any details on the modulation used?

Cheers,
m

On 13.03.2015 17:12, Kevin Zembower wrote:
> Hello,
>
> I'm very new to GNURadio and to RF exploration/hacking in general. I've
> downloaded GNURadio on my Linux system and have been successful in
> installing a couple of systems. I got the RTL-SDR USB receiver working,
> and have the gr-rds system working.
>
> A project I thought of working on would be to try to understand and
> document the system used by Garmin Rino GPS/FRS/GMRS systems (see
> https://buy.garmin.com/en-US/US/cOnTheTrail-cTwowayRadio-p1.html). These
> systems seem to transmit the transmitter's latitude, longitude and
> altitude to all the other Rino radios using the same FRS or GMRS channel
> and squelch code. This seems to occur whenever the Push To Talk button
> is pressed. The receiver's location, as well as all the other
> transmitters, can be viewed on everyone's GPS display.
>
> I searched for Garmin and Rino in the mailing list's archives, and
> didn't come up with anything significant. Is this idea similar to
> anything else that anyone's attempted? If not, can anyone point me to
> ideas for getting started? I'm thinking that I'll first have to capture
> the waveforms produced by keying my Rino, then see if I can discern the
> encoding of the digital information.
>
> Thanks for any pointers anyone can think of to begin working on this
> system.
>
> -Kevin
>
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