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[aprssig] Urgent - need help with OpenTracker cable

Robert Rochte rochte at gmail.com
Sun Apr 8 15:26:27 UTC 2007

Okay, one desperate plea before we scrub our balloon flight planned for

It seems that I can't figure out how to connect the Open Tracker (which
should take the same type of cable as a Tiny Trak or KPC-3+) to either of my
Radio Shack HTs.  I had a cable that worked fine - but it flew off to New
Brunswick and hasn't yet returned.  So I've tried the onboard resistor and
just connecting Audio out to the mic tip and ground to the sleeve - no
workie.  Tried removing the onboard resistor and using a .1 uf cap from
Audio out to the tip and (alternately) a 3.3k or 2.2k resistor from PTT to
the tip (connecting after the resistor) - no workie.

Anyone sitting around, reading their email this Easter morning and happen to
know what I'm doing wrong??  I have about 20 minutes and I scrub the flight
over this...


Robert  KC8UCH
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