Originally Posted by Mich48041
Check the transponder antenna mounting to be sure it is grounded.
Check the voltage regulator case ground and battery negative ground. There should not be any paint on the sheet metal that could interfere with current flow.
Joe, PTT causes EGT spike. I noticed the amount of spike relates to what frequency is being transmitted on. The higher the freq the hire the spike. Also dynon indicated my ems serial number is one which was sensitive to RF interference And to send it in for upgrade. I havent had the opportunity to do the prescribed panel continuity check, but will. Does the above situation ring any bells?