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[aprssig] THD7A GPS Question

Sam Guccione gucci1 at mchsi.com
Sat Feb 23 19:13:16 UTC 2008

Thanks to everyone who responded to the problem. To make the record complete
here is what I found out and my temporary solution.

I had the cable to the D7A wired correctly and all settings were correct.
Apparently all of the GPS receivers that I have including my eTrex were not
able to supply the appropriate signal for the D7A to work that is 8 volts on
the tip of the D7 plug. So I connected a 9 v battery with a switch to "fool"
the D7 into thinking it is getting valid data from the GPS receiver. Works
great just a pain to have to press the switch to get update on GPS location.

My final question, what GPS models will work with the D7 so I can buy one
that will work without any work around like my 9 volt battery solution

Thanks again to everyone for the help. I learned a lot.

Sam K3BY

-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Sam Guccione
Sent: Saturday, February 16, 2008 7:45 PM
To: aprssig at lists.tapr.org
Subject: [aprssig] THD7A GPS Question

After a long lapse I am trying to get my THD7A setup with a GPS. However,
something doesnt seem to be working. I am using a Garmin ETREX set to NMEA
output. I can see the GPS sentences when I plug it into the serial port on
my laptop. I connected the ETREX to a cable with a subminiature plug then
into the GPS jack on the THD7A. I expected to see the POS have the GPS lat
and long but all I get are all zeros. Manual does not say much of anything
about the GPS port. Anyone have suggestion on what I could try to get it
working. What am I missing? Something stupid?

Sam K3BY

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