Squelch not working on one frequency

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   Here's a weird one. Yesterday I flew nine hours from Florida to Ontario, IFR, so many frequencies. Squelch worked as expected until I switched to 119.400, then it seemed like a stuck mic on frequency, but no one else commented. I checked on COM2, no problem, back to COM1/540, problem still there. It would occasionally stop, but was static 95% of the time. I switched to COM2 while on that frequency, then played around with the 540. My (not exhaustive) testing showed that the static issue occurred only on 119.400. When I left the area, I resumed using COM1, which was normal again. Shortly after, I landed for fuel, so the 540 got power-cycled. Maybe that would help.
All was good until, near home, I wanted to monitor a nearby airport frequency which was on 119.400. Sure enough, the static issue reappeared. (I have used that nearby airport's frequency many times without issue, so it seems to be a new behaviour.)

My troubleshooting eliminated:
SQ was off: I checked it multiple times and verified in Aux Audio settings. Turning it on/off made no difference.
SQ failed totally: only 119.400 was affected.
A problem in the incoming transmission: COM2 was not affected, issue recurred at the later station on that frequency.
119.400 worked locally before, so that's one change. Anything I missed?

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SteveMcD Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 Dec 2013 Location: Canada Status: Offline Points: 29	Post Options Post Reply Quote SteveMcD Report Post Thanks(0) Quote Reply Topic: Squelch not working on one frequency Posted: 24 Oct 2021 at 12:21pm
	Here's a weird one. Yesterday I flew nine hours from Florida to Ontario, IFR, so many frequencies. Squelch worked as expected until I switched to 119.400, then it seemed like a stuck mic on frequency, but no one else commented. I checked on COM2, no problem, back to COM1/540, problem still there. It would occasionally stop, but was static 95% of the time. I switched to COM2 while on that frequency, then played around with the 540. My (not exhaustive) testing showed that the static issue occurred only on 119.400. When I left the area, I resumed using COM1, which was normal again. Shortly after, I landed for fuel, so the 540 got power-cycled. Maybe that would help. All was good until, near home, I wanted to monitor a nearby airport frequency which was on 119.400. Sure enough, the static issue reappeared. (I have used that nearby airport's frequency many times without issue, so it seems to be a new behaviour.) My troubleshooting eliminated: SQ was off: I checked it multiple times and verified in Aux Audio settings. Turning it on/off made no difference. SQ failed totally: only 119.400 was affected. A problem in the incoming transmission: COM2 was not affected, issue recurred at the later station on that frequency. 119.400 worked locally before, so that's one change. Anything I missed?

Jmack Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Aug 2018 Location: 08753 Status: Offline Points: 11	Post Options Post Reply Quote Jmack Report Post Thanks(0) Quote Reply Posted: Yesterday at 4:46pm
	I was sorry you didn't get any responses to your post. I have the same problem and hope someone will respond with their thoughts. We use 122.875 for local air to ground communications and I have never had any problems with that frequency until last week. Both my IFD540 and IFD440 have continuous noise on that frequency as if the squelch has been turned off. None of the other planes on the frequency with me are experiencing the noise. I turned the custom squelch on in the maintenance screen and turning the squelch all the way to 80% did not quiet the noise. The problem exists only on that one frequency, and is there with engine running or shut down, and other electrical equipment on or off. Jmack
	John A36

SteveMcD Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 Dec 2013 Location: Canada Status: Offline Points: 29	Post Options Post Reply Quote SteveMcD Report Post Thanks(0) Quote Reply Posted: 23 hours 5 minutes ago at 6:14pm
	Sorry you've had the issue. It did go away on its own, one day I flew near that tower on 119.400 and all was well. I redid my panel and sold the 540. Long story, it's all Garmin now. It's shiny and modern with a great autopilot, but the 540 had a bunch of nice features that Garmin is missing. The FMS format is much better than the menu format. Enjoy your 540! Steve

PA20Pacer Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 07 Mar 2012 Location: Illinois (LL22) Status: Offline Points: 162	Post Options Post Reply Quote PA20Pacer Report Post Thanks(0) Quote Reply Posted: 8 hours 25 minutes ago at 8:54am
	I have had the exact same issue on 125.95 and 132.05. It has not cropped up again for several months, but I am not sure that I have used these frequencies recently. I will have to check next time I go flying. It would be nice to know what is behind this anomaly!
	Bob Siegfried, II Brookeridge Airpark (LL22) Downers Grove, IL