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[aprssig] 433 MHz operation

Bradley Haney kc9gqr at gmail.com
Wed Feb 15 18:29:31 UTC 2012


will we be able to possbile use these in a KISS mode?

On Wed, Feb 15, 2012 at 12:12 PM, Scott Miller <scott at opentrac.org> wrote:

> Hi all,
>
> I've been playing with some half-watt 70 cm data transceivers lately. I'm
> currently testing at 434 MHz, and with the standard crystal they should
> cover about 430 to 439 MHz.  I'm not really familiar with the 70 cm band
> plan and figured I'd check here and see if people consider that a
> reasonable part of the band to be working in.
>
> I've got another small batch of them coming soon and might start selling a
> board based around it for people who want to experiment.  Right now I'm
> using an OpenTracker USB variant.  It's currently running at 4800 baud with
> some basic FEC - a (7,4) Hamming code with interleaving, not fancy but easy
> to implement.  The transceivers will go up to 115200 bps.  When I have
> time, I'll see if they can be made to inter-operate with G3RUH TNCs, but
> for now I'm going to assume that won't work.
>
> The really attractive part is that they're cheap - retail price should be
> not more than 1/3 what we're selling the half-watt transmit-only 2-meter
> modules from SRB for, and they're about the same size.
>
> There are still some bugs to be worked out, but the OpenTracker USB (and
> by extension the Tracker3) will presently work transparently with these
> radios, doing APRS at 4800 baud with error correction.  I'll be working
> some more on them to improve mesh routing and channel access control to try
> to make them more suitable than vanilla APRS for short range, high rate
> tracking applications.
>
> Scott
> N1VG
>
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