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Cobra 29 BT trouble

Discussion in 'CB Radio Forum' started by WMGUY, Jun 5, 2012.

  1. Jun 5, 2012 #1
    WMGUY

    WMGUY Road Train Member

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    Jan 1, 2011
    Nine Mile Falls, WA
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    Hi all, my CB receives great and from a good distance i can pick up most people, but i can't get out across a parking lot let alone anywhere else and im not quite sure what the problem could be,

    there is no whining noise or anything

    truck is a 08 volvo 730 with an antenna on each mirror with ground straps

    SWR is about 2.5

    any help would be great thanks in advance Alec
     
    WMGUY, Jun 5, 2012
    WMGUY, Jun 5, 2012
    #1
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  3. Jun 5, 2012 #2
    Voyager1968

    Voyager1968 Road Train Member

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    I'm no expert as I'm looking for advice in another thread, but I can tell you that your SWR is way too high. You need to try and get that down to at least 1.5 or better.
     
    Voyager1968, Jun 5, 2012
    Voyager1968, Jun 5, 2012
    #2
  4. Jun 16, 2012 #3
    Turbo-T

    Turbo-T Road Train Member

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    I agree. 2.5:1 is really too high. You want the SWR as low as you possibly can. A 1.0:1 would be perfect, but not always achievable.

    1.5:1 is very good. That only means you're only losing 4% of your signal.

    2.0:1 is ok. You're losing 11% of your signal.

    You either have a coax issue or an antenna issue.

    What kind of radio, coax and antenna are you running?
     
    Turbo-T, Jun 16, 2012
    Turbo-T, Jun 16, 2012
    #3
  5. Jun 16, 2012 #4
    ramkatral

    ramkatral Heavy Load Member

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    Are you running factory antennae or coax? Are they cophased?
     
    ramkatral, Jun 16, 2012
    ramkatral, Jun 16, 2012
    #4
  7. Jun 17, 2012 #5
    WMGUY

    WMGUY Road Train Member

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    Jan 1, 2011
    Nine Mile Falls, WA
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    the antenna's are 52" red fiberglass.. factory coax radio is cobra 29 BT... i think i might have found some of the problem the mounts don't have the plastic piece they have 5 washers stacked up so it will be tight.. i think that makes the antenna ground out? but not sure im new to this



    i traced the coax tonight and its not collapsed any where
     
    WMGUY, Jun 17, 2012
    WMGUY, Jun 17, 2012
    #5
  8. Jun 17, 2012 #6
    ramkatral

    ramkatral Heavy Load Member

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    Tryon, NC
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    Correct. There's nothing insulting it from grounding the center conductor if there's no nylon washer. Also replace the factory coax. It's trash.
     
    ramkatral, Jun 17, 2012
    ramkatral, Jun 17, 2012
    #6
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