A poor contact on the key line can also cause problems if the radio's key input isn't designed to handle a high resistance (many are not). 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. 1-push-to-talk switch, 1-locking lever, Short-off type. The microphone to audio line carries voltage to the microphone's internal amp as well as the audio back to the radio or intercom. 5.0 (0.2'), 4-conductor (2-shielded) cable (2.5 m (98.43')) without plug. One set connects the microphone to the mic audio line and the other shorts the Key (transmit on) to ground. Its robust anti-vibration construction and balanced output render the microphone resistive to noise. Have you flown again since? And how are things over at the old T's? Integrated Push-To-Talk microphone Braided Cable now available Retail Price: 34.95 Our Price: 29 (You save 5. Designed for paging calls and general announcements, the PM-660U desk-top microphone comes with a large talk switch and a lock lever for easy and convenient operation. 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.
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