Thanks for the information and opinions. This has grown much larger than I ever imagined!
FYI: The Headset and application is fully certified/compatible/approved/legal etc. and has been for over 15 years. The plug and other components used are the highest quality and aircraft approved/certified. The person doing the wiring is a licenced and experienced (35+years) aircraft technician............ darn; he used leaded solder to connect the plug! Got to run, my house is surrounded by strange looking unemployed people in Zodiacs saying something about poisoning the airwaves. Timber!
Tree