I am having trouble with my Sena SF2 / Rexon RHP 530 radio combo.  (Bluetooth Paired) In noisy condition (ultralight in flight with Rotax 2 stroke motor behind me) I push the PTT to transmit and when I begin to talk the radio stops transmitting. It stops immediately when I start to speak. If I do not speak the radio continues to transmit (open mic).

 

The red radio transmit light stays on when the PTT button is pushed but immediately goes out and stops transmitting when I start to speak. 

This setup/combo works on another ultralight so it seems like I may have a settings set wrong (I do not have access to the other setup to compare).

Any suggestions?

 

Thanks,

Rob