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Radio Receiving issues

I've been recently experiencing a receiving issue on frequency. I can transmit clear and concise per ATC or CTAF. However, A lot of times on climb out specifically the radio will go quiet or very broken. It has even happened on the ground when I was lined up and waiting for a takeoff clearance and I missed the clearance entirely. What I have noticed recently is if the frequency is quiet (say we are listening for traffic 10-15ish miles out) and I tap the transmit button quickly, all of the sudden the frequency becomes alive and I am hearing everything clearly.

Last year I had a issue where I wasn't receiving ATC communications even in the traffic pattern. I swapped the radio to my current one and it seemed to improve immensely.

Radio is a Bendix/King KX155 TSO

Stumped and looking for advice.

Model: Bonanza D35
Posted 9/22/2023 - 5 months ago
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If tapping the transmit button brings it alive, are you seeing the "T" on the 155 prior to the tap? If yes, could be a PTT switch going bad.

Mike
ABS Technical Advisor

Posted 9/22/2023 - 5 months ago
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In reply to: Michael E. Thompson | 9/22/2023 - 5 months ago

If tapping the transmit button brings it alive, are you seeing the "T" on the 155 prior to the tap? If yes, could be a PTT switch going bad.

Mike
ABS Technical Advisor

I am not see the "T" on the 155 prior. :/

Posted 9/22/2023 - 5 months ago
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Marc, I have seen several B-K radios do this before and I think it is related to the auto-squelch circuitry. Remember that your KX155 is probably 20 years old. They are getting almost impossible to work on. At some point we all have to “bite the bullet” and upgrade to newer avionics equipment.

Posted 9/22/2023 - 5 months ago
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I'd say Steve is on to something. If the squelch was broken by a momentary transmit press, it may come alive for a while, and the lack of the T on the 155 tells us it is likely not in the aircraft and / or audio panel circuitry that is creating an open mic situation, which would disable the audio from the receiver.

Mike
ABS Technical Advisor

Posted 9/22/2023 - 5 months ago
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Radio Receiving issues