Another heads up on the Zap, I had a glitching problem in PCM mode, that destroyed my Edge, it did not go into fail safe just glitched into the ground, I sent the Tx for a service and was told that the two copper wiper blades inside the ball gimble in the top of the Tx that make the final connection to the antenna had corroded, these are the things you can feel click into place when you pull up the final section of the antenna, dosn't matter now as I have got rid of the antenna.

Mike