Kriss, 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. -Ed- KJ6BGS --- In [email protected], "captnkliegle" <klie...@...> 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 does work. > 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)
