I believe you have to modify the wiring harness. The AR 3201's mic setting could be changed by moving a jumper. Not so on the 4 4201. Mics use different pins on the back of the radio based on dynamic vs standard type.
Do you have a manual for the radio?
CP

On Monday, October 8, 2012 11:04:31 PM UTC-4, Don wrote:
I have an AR4201 that I have always used with a dynamic boom mic and I

swapped it with an AR4201 wired for a standard mic in another glider.

After sliding it in the box it receives fine and the mic keys the radio,

but I'm not getting any transmit audio. Any ideas what adjustments or

software instructions to change? Anyone else seen this problem?