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[aprssig] 433 MHz operation

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Wed Feb 15 18:41:40 UTC 2012


Radios (transceivers) don't do KISS, they do audio.  TNCs do KISS and 
both the OpenTracker USB and the Tracker3 can do KISS.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 2/15/2012 1:29 PM, Bradley Haney wrote:
> 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 
> <mailto: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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>
>
>
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