IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM - Squelch not working on one frequency

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Squelch not working on one frequency

Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=2274
Printed Date: 27 Apr 2024 at 5:10pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com

Topic: Squelch not working on one frequency

Posted By: SteveMcD
Subject: Squelch not working on one frequency
Date 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?