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What am i missing?

Discussion in 'CB Radio Forum' started by hayseed, Sep 23, 2020.

  1. Sep 23, 2020 #1
    hayseed

    hayseed Light Load Member

    211
    109
    Dec 31, 2011
    The Natural State
    0
    Back into radios after a few years. New Sirio 5000 Mag mount ant. into a Connex. '18 GMC pickup. Roof mount with the mag mount. Can't get the SWR below 2.5

    Any ideas?

    Old antenna was a Wilson 5K and the SWR was 1.3 mounted on a tool box in the bed. Tried the wilson on the mag mount no change in the SWR.
     
    hayseed, Sep 23, 2020
    hayseed, Sep 23, 2020
    #1
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  3. Sep 24, 2020 #2
    Timin770

    Timin770 Road Train Member

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    May 27, 2011
    Canton, GA
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    Make sure you are way the heck away from any buildings or other vehicles when checking SWR
     
    Timin770, Sep 24, 2020
    Timin770, Sep 24, 2020
    #2
  4. Sep 24, 2020 #4
    Night Stalker10

    Night Stalker10 Road Train Member

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    Jun 26, 2017
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    The problem with mag mount antennas is that they either work or they don't. Is this a new mag mount, or is it one that you have used before?

    Mag mount antennas are grounded through capacitive coupling between the magnet and the vehicles metal roof. They usually work fairly well with VHF and UHF frequencies. It seems like they can be more difficult to use on HF frequencies, such as 11 meters. It takes a bigger magnet to hold the longer antenna on the vehicle too.
     
    Night Stalker10, Sep 24, 2020
    Night Stalker10, Sep 24, 2020
    #4
  5. Sep 24, 2020 #4
    Ridgeline

    Ridgeline Road Train Member

    20,732
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    Dec 18, 2011
    Michigan
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    A bunch of those Sirios mag mounts have the aluminum sheet not installed which creates the capacitance when it is on the vehicle. They give one in the box and gets lost.
     
    Ridgeline, Sep 24, 2020
    Ridgeline, Sep 24, 2020
    #4
  7. Sep 25, 2020 #5
    jessejamesdallas

    jessejamesdallas Road Train Member

    1,415
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    Oct 3, 2008
    Republic of Texas
    0
    SWR 2.5 on what channel? 1 or 40?.....I doubt it's 2.5 across all the channels
     
    jessejamesdallas, Sep 25, 2020
    jessejamesdallas, Sep 25, 2020
    #5
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