Excellent help! Thank you very much!
As you said, there was enough power coming off the mic jack to power the
OT2m. The grounds did have continuity so I bundled them together, and
the AF out is working as my audio in. I'm transmitting and everything!
I also think these clues will help me with the trouble I'm having with
the Kenwood connector (different thread).
Right now, it's all on the breadboard until I get a second IC-28A coming
in to use for parts (the squelch pot on mine is busted and I want it to
be 100% before I put it all together in the car).
Thanks again for your help.
--- In firstname.lastname@example.org, "captnkliegle" <kliegle@...> wrote:
> Check the ops manual as to how much current can be pulled thru the 8V
dc line, typically <150mA. (That's used to power the electret mic BTW)
If set up is ONLY used for the OT2 and no external GPS... should be OK.
I have numerous Open Trackers of all types, so I never know what the
tracker/GPS configuration will be. Therefore....For powering the
tracker, I take small gauge wire and tap into the rig powerpole
connector. Insert a small fuse as well. Mini blade fuses are easy to
solder wires too and shrink tube can cover the solder, allowing the fuse
to be checked visually.
> The PTT line on rig would go to Pin 3 on the DB-9 (When grounded it
will TX the radio)
> The audio (if genuine AF output, not discriminator audio), can go from
PIN 8 on mic jack of rig to pin 5 of DB-9) OTW one has to get audio from
external speaker jack, more wiring and another point of failure.. but
> Use a DMM on continuity and see if the two GNDs (Mic and PTT GND) are
the same (connected) on the mic jack. OTW use the PTT ground.
> I just wired up a Kenwood TM-241A using the external speaker for audio
and had to remove the 2.2K ohm pull down resistor on the PTT on a TT3+.
Worked fine as is on a OT rev 4 set up for mobile rig. I put the
resistor and caps in my DB-9 for HT work, that way I don't have to
remove the cover when putting a tracker together.
> Kriss KA1GJU-X X=INT(2-9)