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CB radio problem?

Discussion in 'Technical Chat' started by tacomaforlife, Feb 15, 2011.

  1. Feb 15, 2011 at 3:55 PM
    #1
    tacomaforlife

    tacomaforlife [OP] Well-Known Member

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    for some reason my cb is acting up when i talk in the mic my voice come out of my speakers :confused: but my cb radio isnt connected to it in anyway need help.
     
  2. Feb 15, 2011 at 4:10 PM
    #2
    tacomaforlife

    tacomaforlife [OP] Well-Known Member

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  3. Feb 15, 2011 at 4:11 PM
    #3
    rolltide3705

    rolltide3705 Well-Known Member

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    Same thing happens to mine when my Metra Ipod adapter is on... subd for an answer
     
  4. Feb 15, 2011 at 4:17 PM
    #4
    tacomaforlife

    tacomaforlife [OP] Well-Known Member

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    well glad im not the only one
     
  5. Feb 15, 2011 at 4:19 PM
    #5
    Badwin45

    Badwin45 Well-Known Member

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    That's odd. Have you made any modifications to the radio?
     
  6. Feb 15, 2011 at 4:21 PM
    #6
    NetMonkey

    NetMonkey Well-Known Member

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    does the CB radio have blue tooth?
     
  7. Feb 15, 2011 at 4:23 PM
    #7
    MT Madman

    MT Madman Senior Citizen

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    Are you saying it's coming out the lullaby (car stereo) speakers? If so you RF cable to the antenna may be running along side you speaker wires and feeding across, or you might have high reflected on your antenna.
     
  8. Feb 16, 2011 at 7:16 AM
    #8
    tacomaforlife

    tacomaforlife [OP] Well-Known Member

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    yea it is the car speakers and my cb is located where the ash tray was located so its by the speaker wires.
     
  9. Feb 16, 2011 at 3:55 PM
    #9
    MT Madman

    MT Madman Senior Citizen

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    Temporarily move it and transmit on it again to see what happens. Also you might have to move the antenna cable if they are run along side the truck wires.
     
  10. Feb 16, 2011 at 3:58 PM
    #10
    bjmoose

    bjmoose Bullwinkle J. Moose

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    What does your swr meter say?
     
  11. Feb 18, 2011 at 8:46 AM
    #11
    N3ZAT

    N3ZAT Well-Known Member

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    Have you solved ur problem yet???
     
  12. Feb 18, 2011 at 11:47 AM
    #12
    tacomaforlife

    tacomaforlife [OP] Well-Known Member

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    yea im gonna see about moving it again but my cb is where the ashtray used to be does any one else have problems with the cb mounted there?
     
  13. Feb 19, 2011 at 3:33 AM
    #13
    MT Madman

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    Like bjmoose suggested have you checked the VSWR? Lot's of feed over of RF are caused by a high VSWR reading, that's what I was meaning in my first post of high reflected. Also just because you have feed over problems doesn't mean someone else will, that's why they call the way electronics works a "Theory of Operations" and that's what makes it fun for me exact replicas of an installation of a repeater site but you have to change something to make it work.
     
  14. Feb 19, 2011 at 7:23 PM
    #14
    yhiki

    yhiki Active Member

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    The VSWR is a good first check. Next would be your grounding. If you are only using the negitave wire for ground, try a short strap from the radio case to the truck body.
     
  15. Feb 19, 2011 at 7:41 PM
    #15
    gfiber

    gfiber Well-Known Member

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    Age old problem. A lot of times its fundamental RF overload of the speaker amplifier in the stereo system. Transistorized systems recitify the RF signal and you get the sound from the speakers.

    But as others have quite right suggested, check and make sure you have a good low SWR. High SWR feeds back RF to the transceiver and also causes the feedline to radiate, which you don't want. The RF feedback to the radio subtracts from your transmit power and can damage the transceivers final amplifier transistor to boot.

    Next look at how you have run the antenna feedline. Is it running parallel to the speaker wires? usually if the feedline crosses over at right angles the speakers wires it will cause no problems. You get into trouble when it runs alongside.

    If both of these are correct then possibly antenna reloacation, borrow a magnet mount type if you can and place it at varius places on the vehicle to see if this stops the RFI in the speakers.

    If none of this works then it gets a bit of a mess to solve. Install shielded speaker cable with the shield only grounded at one end. Bypass capacitors installed at each speaker, usually 0.01 microfarad disc Ceramic capacitors at several hundred volts, they are quite small in size. generally soldered across the speaker terminals, RF chokes in the speaker wires. I doubt you will have to go this far. I run over 100 Watts HF in my 2009 DBL cab with no ill effects, my antennas SWR is tuned each I change frequencies. For a CB antenna thats not necessary however, just tune it for the lowest SWR on Channel 20 and you should be ok.
     
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