[aprssig] Argent open tracker

Randy Love rlove31 at gmail.com
Thu Jul 14 13:14:31 EDT 2016

I have used Garmin GPS18 pucks with the DE9 Femail interface intended for
connection to PC's directly into OT+ devices without concerns for levels.

They have worked without issue.

If you hook a GPS18 up to a PC and verify that it is sending NMEA sentences
at 4800 baud 8N1, then it will work correctly with an OT+, OTUSB, T2, or T3.

That has been my experience with the GPS18's that have the DE9 Female
interface with OpenTracker devices. I have 4 GPS18's and have used them
with many different OpenTracker devices as well as Byonics TT3's and Knwd
APRS capable radios ( TM-D700, D7, D710, and D72 ). No additional level
sense or polarity modifications were needed.


On Thu, Jul 14, 2016 at 12:19 PM, Tom Hayward via aprssig <aprssig at tapr.org>

> On Thu, Jul 14, 2016 at 8:59 AM, Andrew rich via aprssig
> <aprssig at tapr.org> wrote:
> > Thats my point - they want to act at RS232 but they can only go TTL
> levels.
> >
> > RS232 height would be > 7 volts
> > RS323 height would be < 7 volts
> >
> > Garmin
> >
> > RS232F is VCC
> > RS232F is 0 Volts
> Andrew,
> The piece I'm missing here is your question/problem. What hardware do
> you have, how do you want to use it, and what are you observing?
> The Argent Data OpenTracker OT1+ uses a 2N7002 on the GPS RXD line,
> which should trigger down to 1V. TTL levels from the GPS are probably
> not your problem here. When I have used TTL GPS modules with
> OpenTracker, I've had to invert the RXD line. If you have already
> confirmed your data is the right polarity, maybe something else is
> going on, but I don't have enough information about your setup to help
> you find it.
> https://www.argentdata.com/support/ot1plus-smt-1_5-schematic.png
> Tom KD7LXL
> P.S. Some posts from other times this has been asked that may be helpful:
> https://groups.yahoo.com/neo/groups/opentracker/conversations/topics/11672
> https://groups.yahoo.com/neo/groups/opentracker/conversations/topics/11652
> https://groups.yahoo.com/neo/groups/opentracker/conversations/topics/11419
> (you, Jason, and I all posted in this thread!)
> https://groups.yahoo.com/neo/groups/opentracker/conversations/topics/10986
> https://groups.yahoo.com/neo/groups/opentracker/conversations/topics/9833
> https://groups.yahoo.com/neo/groups/opentracker/conversations/topics/8763
> _______________________________________________
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