If the Key contact works the radio will go into transmit mode and if the mic contacts are corroded the mic audio will be missing or very attenuated.
The microphone to audio line carries voltage to the microphone's internal amp as well as the audio back to the radio or intercom. One set connects the microphone to the mic audio line and the other shorts the Key (transmit on) to ground. Push to talk of a microphone should happen after the pre-amplification stage and not at the input with phantom power. Integrated Push-To-Talk microphone Braided Cable now available Retail Price: 34.95 Our Price: 29 (You save 5. Mother nature doesn't like when you switch Phantom on and off of a microphone. Have you flown again since? And how are things over at the old T's? Trying to put a push to talk switch onto a phantom powered microphone is asking for big trouble. The push-to-talk option makes transitions. Compatible with Audiocom (Telex), RTS TW, RTS Ma- trix, Clear-Com, and other wired intercom types. The push to talk is really just a binary thing - on or off - so if the radio is transmitting at all then I'd be surprised if replacing the PTT fixed your problem. The USB cable provided with your Tower System has been qualified by FrontRow.
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