Believe the 4201 has a transmit indication on the display. Are you getting intermittent indication there too?
If so, not the microphone but could be the wiring of the PTT. or the switch itself. A bit of extra resistance and you won't get a clean switch to "transmit".
Check that the D-Sub connector on the back of the radio is fully locked, and the power supply is good. Exercise the breaker or remove and replace the fuse. Damaged wiring would limit current to the radio which could give the same result. It takes more current to transmit.
Jim

On Sunday, October 18, 2015 at 2:24:33 PM UTC-7, Dan Marotta wrote:
I would suspect your microphone.* Perhaps you could borrow a known
good mic and fly with it.




On 10/18/2015 3:05 PM, Blake Seese 3Y
wrote:



Hello all,

My Becker 4201 just started acting up. Specifically, it has a cyclic regular dead spot when transmitting, so the person listening to you gets about half of each word. It receives just fine, and all functions work as they should. Same thing happens with a fully charged battery or one that has been used for several hours. Has anyone ever run in to this?

Thanks,

3Y


Dan, 5J