[aprssig] Best TNC for use as portable digi?

'Scott Miller' scott at opentrac.org
Wed Apr 25 15:15:20 CDT 2007

Pretty much.  Should be in the 20-30 mA range.  I don't really remember for
that particular version.  It doesn't have an ST202 like the newer ones, so
that saves a few mA.
One advantage of the full-size board is the high-side switch.  It'll control
a load up to 30 amps, assuming you keep the duty cycle reasonable.  I used
it (with a 9 amp switch) for my resistor-based cutdown device on my own
balloon, though I didn't wind up using it.
Found a pic of the old board here:


From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
On Behalf Of Robert Rochte
Sent: Wednesday, April 25, 2007 1:05 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Best TNC for use as portable digi?

Well, I was planning on the KPC-3+, so "light" is relative...  :)  

If the weight is down in the grams, then I just might fly it on a
superpressure instead of a solar Montgolfiere - hadn't considered that there
might be something so small!  

I assume that the power requirements for this would be dwarfed by those of
the radio and/or GPS - correct?


Robert   KC8UCH

I *might* be able to scrounge up one of the original prototypes, built to
fit the same case as the original OpenTracker and the TinyTrak3.  Only about
half of them worked, thanks to a problem with the oscillator circuit. 
Without the connectors it only weighs a few grams - what's your weight

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