Thank you for the PDF, Bill. After I got Paul's suggestion about the CTCSS box I had the same thought - use the power from the rig and connect the tone encoder inside. I really appreciate the solution you present. Thing is I have yet to hear any activity on any 10 repeater FM output frequency and I can't key up the 29.620 Boston machine (on 29.520) to see if it's even active. Ditto for 680 which is also listed, or 640.
I was hoping all along that the frequency synthesizer for the tone generator was like a 555 timer - we just needed to change a cap & resister. No such luck, I guess, but I'm gonna keep exploring. This is a great backup solution, though, thanks again.
I have the information about adding a Com-Spec CTCSS unit to the HTX-10 rig....... PDF about 125 KB easy attached to an Email.
Seems the 88.5 tone is "locked in" and can not be altered...only turned on and email@example.com