Well, so far so good on my IF/Transverter project. Thanks to Doug Reed and others fir help/hints.  I have a small 12v Reed relay/reverse protection diode on a small board grounded to the RCI-2950 (early) radio case. A 9v switched voltage is tapped on J54 to power the coil. The output terminals run to case and center pin contacts on the added 1/8" phone jack to the ptt on the DEMI 28-222 Transverter. Output power on the RCI is set just below 10w max input to the hi power input fof the DEMI unit. Ready to test it out, but now I have to find/make some jumpers. All mine are still in the truck from the CQWW test. I'll tidy it up a bit more wiring wise once I make sure things are playing nice.