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SWR problem in a dump truck

Discussion in 'CB Radio Forum' started by trailbum, Apr 13, 2013.

  1. Apr 13, 2013 #1
    trailbum

    trailbum Bobtail Member

    3
    0
    Apr 13, 2013
    Stockport, Ny
    0
    A friend just got a 1993, 357 Pete Aluminum body dump truck. I tried to match his antenna and got readings off the scale. Tried ground, moved antenna, Tried different antenna, Different co-ax always with the same reading. Grounding helped only to the point that the needle didn't slam the top of the scale but it was still off the scale...
    Is it possibly the Aluminum dump body is not part of the ground plane, therefore causing reflection? If so would running a ground strap from frame to aluminum body help???
     
    trailbum, Apr 13, 2013
    trailbum, Apr 13, 2013
    #1
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  3. Apr 13, 2013 #2
    Voltrucker

    Voltrucker Medium Load Member

    467
    133
    Sep 24, 2012
    West TN
    0
    I'm guessing reflection.
     
    Voltrucker, Apr 13, 2013
    Voltrucker, Apr 13, 2013
    #2
  4. Apr 13, 2013 #3
    trailbum

    trailbum Bobtail Member

    3
    0
    Apr 13, 2013
    Stockport, Ny
    0
    Thanks for the come back Voltrucker. I think so too, any Ideas on how to get the S W R's down?
     
    trailbum, Apr 13, 2013
    trailbum, Apr 13, 2013
    #3
  5. Apr 14, 2013 #4
    TDRV2000

    TDRV2000 Bobtail Member

    40
    13
    Feb 27, 2013
    Ohio
    0
    I have had 2 Pete 357's. If you are wondering about reflection causing the high SWR just raise the bed to tell. I found that using either a 3 or 4 foot tall top loaded antenna worked the best for me. Does the truck still have the factory cb coax?
     
    TDRV2000, Apr 14, 2013
    TDRV2000, Apr 14, 2013
    #4
  7. Apr 15, 2013 #5
    Voltrucker

    Voltrucker Medium Load Member

    467
    133
    Sep 24, 2012
    West TN
    0
    Buy a Wilson 2000 Trucker series antenna. Make sure to get the longest shaft they have so you'll be above everything that could possibly reflect.
     
    Voltrucker, Apr 15, 2013
    Voltrucker, Apr 15, 2013
    #5
  8. Apr 19, 2013 #6
    LRod

    LRod Bobtail Member

    20
    18
    Feb 12, 2009
    0
    try using a no ground plane antenna.......I belive they come on the freightliner cascadias from the factory to solve the very issue you are describing. just do a google search on no ground plane cb antenna....you find several to choose from.
     
    LRod, Apr 19, 2013
    LRod, Apr 19, 2013
    #6
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