I am currently working on a stock Ranger I which came without the factory installed PTT circuit. I have done the usual larger caps for the high and low votages, solid stated all supplies and built a power supply from the filaments to run a PTT relay circuit etc. The unit transmitts well on all bands and all switches function perfectly.
Now for the problem... I recently installed the PTT circuit in the key line as outlined in the "Timtron" mods. It works well in the phone position but when I switch the Xtal, VFO knob to the "Zero Beat" position it keys up the transmitter as if I keyed the mic in the phone position ?? When I disable the PTT circuit like when it was stock the zero beat works perfectly. I quickly checked the wiring on both the mode and xtal switches against the Johnson schematic but have found nothing which would explain it. I've done several PTT circuits on Rangers and have never had this happen. Every time I put the PTT back in the circuit the "zero beat" keys up the transmitter.
Anyone out there ever had a similar problem? Your ideas and cures would greaty be appreciated. I am using the duct tape to keep my head from exploding, so please hurry.
Thanks,
Peter N2IDU Old Shincracker, Vt.
