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[aprssig] GPS to TNC APRS packet processor

Wes Johnston wes at kd4rdb.com
Sat Mar 18 02:53:08 UTC 2006

Scott, what is your guess for a price on the T2 kit?  I have a SCSG meeting in the morning, and would like to "rough" them in when telling them about it.

----- Original Message -----
From: scott at opentrac.org
To: 'TAPR APRS Mailing List' <aprssig at lists.tapr.org>
Sent: Fri, 17 Mar 2006 16:04:12 -0800
Subject: RE: [aprssig] GPS to TNC APRS packet processor

> > Just wondering if anyone has invented such a device, perhaps using a
> > microcontroller of some sort, that would sit in between a GPS and a
> > TNC so that TNC's which are not out-of-the-box stand alone tracker
> I don't think so, mostly because it costs just as much to make one that does
> the same thing without needing a TNC.
> > and the TNC could take care of transmitting it.  Using a real TNC
> > would have its advantages versus a TinyTrak, et al on HF since the
> > method of carrier detection is by audio voltage.  On HF, I find it
> You can just add an XR2211-based carrier detect circuit to an OpenTracker or
> TinyTrak.  The newest OpenTracker board I'm working on (the Tracker2) is
> already in beta testing and has a '2211 circuit built in.  It'll cost a bit
> more than a regular OT kit, though.  And I haven't written the software DCD
> code yet - white noise will trigger it right now.  That's a 5-minute fix,
> though - there's already a flag that tells it if the DPLL is synced, just
> need to feed that into the CD counter.
> I guess maybe using a T2 doesn't count as 'without a TNC', though.  It's a
> TNC in itself, and will do KISS and operate as a digipeater.
> Scott
> N1VG
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