Hey guys -
As I mentioned in another post to Jake, I have a wiring problem in my Duce that is really nagging at me.
I installed the radio (MicroAir 760) per their wiring diagram. When I press the PTT, I get a loud squeal in the headphones, and the tach needle goes to the top of the scale.
Power for the tach comes from a main power bus, input from the mag switch - power for the radio thru the avionics bus.
I re-wired the jacks with shielded wires, as they are on the left of the panel, and the radio is on the right. Still squeals.
I disconnected the switch that operates radio or intercom - still squeals.
Any hints, tips, or whatever would be really appreciated!