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High pitched frequency noise when radio is on

Discussion in 'General CB Services Discussion' started by Ghostof309, Aug 11, 2017.

  1. Ghostof309

    Ghostof309
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    Hello, new to the forum here. A lot of great information and I appreciate you all having me. Here is my issue. I have a Galaxy dx959b. Everything appears to work fine but when the radio is turned on, there is a high frequency noise, almost like the ringing in your ears. Not very loud, just loud enough to annoy me. It is always audible, during transmit or receive, when the radio is quiet or noisy. RF up or down, Squelch up or down. When its in the truck or on the bench. It is not engine noise but sounds like it is a component that is putting the noise out. I cracked the case and looked inside and everything appears to be stock. All of the solder joints look stock, everything appears to be tight. An insight would be helpful.
    Thanks for you time.


     

  2. sp5it

    sp5it
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    Disable backlight. Problem solved.
    Mike
     
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  3. bob85

    bob85
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    probably the EL inverter, never seen a cb that uses one that did not make noise,
     
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  4. Ghostof309

    Ghostof309
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    Thank you. Just opened mine up and the plug isn't there. I have the 959b, was I suppose to have one? I don't see any of the cable at all. Where did those wires trace back to on the board?
     
  5. Ghostof309

    Ghostof309
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    Looks like it was removed but I did locate the EL behind the meter and it's definitely the culprit. So now that we know the wiring is removed, how do I silence it? It's mounted on a U shaped circuit board on the back on the meter. Any way to remove it without screwing up anything?
     
  6. loosecannon

    loosecannon
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    there is a wire that carries the AC for the backlit display. It is grey in the radios i've seen, but it could be a different color.
    when this wire is routed right next to the wires that go to the volume control, you will get this squeal.

    undo the cable ties that bundle all that stuff together, and find the wire that powers the backlight, as well as the wires that go to the volume control.

    try to route them apart from eachother as best you can.

    this will not eliminate the whine in all cases, but should reduce it.

    I had a 929 with this problem come in, and the only thing that worked was to unscrew that PC board from behind the meter, and move it so it was sitting horizontally on top of that wire bundle.

    of course this PC board is where the meter lighting is, so you'll have to figure out how to light the meter.

    one of the ways i used to do it when i was turning everyone's radios blue was to melt two small holes in the bottom of the meter body, just big enough for a 5mm LED to fit, and glued in two LEDs. If you insulate the leads of the LEDs and bend them 90* right at the base of it, you can fit the meter back into place.

    I found this to be the best way to evenly light up the large style galaxy meters.
    good luck.
    LC
     
  7. Ghostof309

    Ghostof309
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    Thanks for the information. I will have to try that one out. The noise primarily comes from the little EL Converter behind the meter but there is a bit of it bleeding through the speakers so I will give that a shot and see if that works.
    Thank You
     

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