Sue Bon Posted April 30, 2023 Report Posted April 30, 2023 Hi guys, I'm back after a long and frustrating panel upgrade. I'm super stoked with 99% but I'm dealing with one issue... If I have Com1 and Com2 audio active (using Com1, monitoring Com2 on 121.5), when I speak on Com1 it activates the squelch of Com2 causing lots of static feedback in my headset. ATC doesn't hear it, but it's brutal on my side. I see the RX on Com2, so that's how I know it's being activated. Here's another thing... it's not all the time. It happens maybe 75% of the time, but not every single time. Any thoughts? I'm loving the GFC500 and the GTN650Xi. Maybe it helps to know that my Com1 is now GTN650Xi and Com2 is my old GNS 430W. Can't wait to hear your thoughts Sue Quote
N201MKTurbo Posted April 30, 2023 Report Posted April 30, 2023 Does it happen on all transmit frequencies? Or just some? Your avionics shop needs to double check the coax makeup and radio grounding. If all checks OK, have them check the VSWR of both antennas from the radio connectors. If they can’t cure the bleed over with antenna work, you should have them adjust the squelch on the receiver. 2 Quote
RoundTwo Posted April 30, 2023 Report Posted April 30, 2023 Hopefully they updated the antenna cable with a modern dual-shield like RG-400 instead of using the old RG-58 that is who knows how old. 1 Quote
Ragsf15e Posted April 30, 2023 Report Posted April 30, 2023 On 4/30/2023 at 8:48 PM, Sue Bon said: Hi guys, I'm back after a long and frustrating panel upgrade. I'm super stoked with 99% but I'm dealing with one issue... If I have Com1 and Com2 audio active (using Com1, monitoring Com2 on 121.5), when I speak on Com1 it activates the squelch of Com2 causing lots of static feedback in my headset. ATC doesn't hear it, but it's brutal on my side. I see the RX on Com2, so that's how I know it's being activated. Here's another thing... it's not all the time. It happens maybe 75% of the time, but not every single time. Any thoughts? I'm loving the GFC500 and the GTN650Xi. Maybe it helps to know that my Com1 is now GTN650Xi and Com2 is my old GNS 430W. Can't wait to hear your thoughts Sue Expand As @N201MKTurbo said, there are a couple more in depth things that should be checked first, but the squelch is adjustable if the radios were properly set up and grounded. Others have had issues where they needed to lower the squelch from standard on their 650, so I wonder if the shop played with it? Also, are your antennas top/bottom? If they’re on the same side, how close? 1 Quote
Sue Bon Posted May 1, 2023 Author Report Posted May 1, 2023 On 4/30/2023 at 9:32 PM, N201MKTurbo said: Does it happen on all transmit frequencies? Or just some? Expand Hmm... Maybe this is why it doesn't happen all the time. Maybe it's something to do with the frequencies. He did adjust the squelch on the receiver, but didn't want to turn it down too much. On 4/30/2023 at 9:35 PM, RoundTwo said: Hopefully they updated the antenna cable with a modern dual-shield like RG-400 instead of using the old RG-58 that is who knows how old. Expand He did say new cables. My invoice says Coaxial cable RG-142. Is that it? I also have a Coaxial cable P/N GX03272. On 4/30/2023 at 11:05 PM, Ragsf15e said: Also, are your antennas top/bottom? If they’re on the same side, how close? Expand On top. The normal distance. Same as before. 1 Quote
takair Posted May 1, 2023 Report Posted May 1, 2023 Ask them if they wired in the com transmit interlock. Great picture! Where is that? 1 Quote
Sue Bon Posted May 1, 2023 Author Report Posted May 1, 2023 On 5/1/2023 at 10:29 AM, takair said: Great picture! Where is that? Expand Thanks! It's in front of the Rock of Gibraltar It was my big adventure last year. 3 1 Quote
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