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My Uniden Washington is "SCREWY"

Discussion in 'General CB Services Discussion' started by theborg, Aug 12, 2017.

  1. theborg

    theborg
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    When I screw the coax into the back, all the way...I hear nothing. When I back it off so just the pin is in, without tightening, I can hear the world. I thought it was bad coax so I bought new stuff.
    No change! What is this????


     

  2. LeapFrog

    LeapFrog
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    Vocoder Frog

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    Maybe the antenna connector in the back of the radio is failing, could be a bad solder connection on the center conductor of the SO-239 (the antenna jack), sometimes I find them too worn out and loose, and yours may need replacing if it is loose internally.

    I had a Grant Xl once that had "screwy output", turns out the stranded wire that delivers the output was only hanging on by a few individual strands (to the antenna jack)
    I stripped 1/4 inch off and re-soldered it, problem gone!

    I took the covers off another radio once and observed the inner conductor of the antenna jack sliding as I was pushing the coax in, it was time to replace the SO-239.
     
    #2 LeapFrog, Aug 12, 2017
    Last edited: Aug 12, 2017
  3. theborg

    theborg
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    Thanks frog, I will look into this.
    :D
     
  4. sonoma

    sonoma
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    did you verify your antenna is not shorted.
     
    Robb likes this.
  5. Robb

    Robb
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    Yup

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    Many antennas have a tuned DC short to reach resonance, but I know what you mean . . .
     
  6. Hurricane145

    Hurricane145
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    Most likely a bad PL-259.
     
  7. kaos513

    kaos513
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    Or try deoxite on the connector
     
  8. nomadradio

    nomadradio
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    If the antenna is shorted, this is what you'll observe.

    Touching just the center pin alone will turn the outside surface of the coax into a demented receiving antenna.

    But connecting the shield to the grounded outer part of the socket turns that coax braid into a shield. Keeps out all RF signals.

    If your antenna is toast, that can cause this problem

    If the center-wire connection at the far end of the coax is broken, you'll see this symptom.

    If the far end of the coax is shorted from center wire to shield, you'll see this symptom.

    And if someone has pushed a straight pin through the coax outside the house, this will short the center wire to the shield braid and cause this symptom.

    Troubleshooting a fault is a process of elimination, finding all the parts of the system that are NOT bad, one by one. Eventually this will lead you to what HAS gone bad.

    A SWR meter is a handy tool to keep around a base station. Even if an antenna is perfect when you put it up, it won't stay that way forever. Anything you put outside into the weather and sun will deteriorate, no matter what it is.

    The coax plug at the bottom of the antenna must be waterproofed. If you don't, the connector will soak up rainwater like a sponge. Capillary attraction will suck that water down inside the coax, between the strands of the shield braid.

    Bad juju when that happens.

    Soldering the shield braid to the plug is not easy. Lots of folks just fold over the braid and call it good enough. So long as you don't mind replacing that connection a few times a year, it will be. Soldering the braid to the plug prevents the copper strands from oxidizing and disturbing the metal-to-metal contact between the braid and the body of the plug. Makes it last longer.

    And yeah, putting up a base antenna should be simpler.

    73
     

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