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Thread: Bendix/King KY97A squelch knob issue

  1. #1
    irishfield's Avatar
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    Bendix/King KY97A squelch knob issue

    Have an aircraft here that the On/Off - Pull to test knob works it's way out in flight which is becoming very annoying to the owner with the "static" blasting in his ears when it does. Anyone have a quick fix to get the friction? back in this knob/shaft assembly so it stays in place?

    THANKS!!

  2. #2
    skywagon8a's Avatar
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    Place a felt washer under the knob.
    N1PA

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    irishfield's Avatar
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    Thanks for the idea... do you know if the knob just pulls off or is there a hidden screw somewhere or clip. I pulled pretty good on it the other day and it didn't want to give. Didn't want to pull any harder for fear of failure.

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    Hmmmm......the way I remember the KY-97, is when you want to test the squelch you pull out on the on/off-volume knob.The knob has what feels like a detent that you "pull through". Then you push back in to go back to the volume mode.Seems to me if the knob is "backing out" then the detent is the culprit. ( worn out )

    As far as the felt washer goes,you don't have to remove the knob to apply it.Just slice the washer with a razor blade and slide the washer around the push/pull shaft the knob is on.If the washer is snuggly against the shaft it may provide just enough friction to prevent it from backing out.

    On the other hand, I would open the radio enclosure and see if the detent or whatever is supposed to keep the knob from moving out is intact/bent/?? It may be a simple adjustment/bending. Let us know.....Herman.
    Last edited by HATIN11R; 11-02-2011 at 10:42 AM.

  5. #5
    irishfield's Avatar
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    I'm betting the intent was a felt washer would be retained by the housing on the OD and stop the vibration from being able to bring the shaft forward on the felt washer ID by adding a bit of friction.

    I'm gonna just pop the sucker out of the panel today and get a better look at it and see what I can do with it... and yes pull out to test, set volume by listening to static and push back in to operate.

  6. #6
    skywagon8a's Avatar
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    I think that there is a little allen set screw in the side of the knob.
    N1PA

  7. #7
    irishfield's Avatar
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    Yes indeed there are two of them.. smaller than a .050 and I could only see them once I pulled the radio. I was about to file a .050 key down to try and fit it and then realized the front bezel would slip off over all the knobs and buttons by removing the 2 screws at each end of said face plate. Was about to slit and then glue a thin felt sheet around the shaft to the attachment area of the volume/squelch shaft to add some friction, but used some circuit board cleaner to clean the shaft a tad. Worked it in and out for awhile and found the detent trying to do it's job. Then put a very little bit of light lube on it, worked it some more and the detent started working well and even snaps the shaft back in with only a light touch on the end of the knob. Radio back in and tested.. and based on how much I have to pull it to get static there is no way vibration is going to do it. Man that sounds like porn...

    Thanks for the help lads!

  8. #8

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    Irish.....glad I remembered how the 97 worked and about the detent issue.I sure did enjoy mine when I had it.Glad it was that easy.....Herman.

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