MFJ Analyzer Question

Discussion in 'CB Radio Forum' started by delta5, Aug 16, 2017.

  1. Aug 16, 2017 #1
    delta5

    delta5 Road Train Member

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    I just installed a 4ft Francis fiberglass whip on the new cascadia I driving. It's mounted on the pass door with a custom mount made for where that spot mirror goes above the window. My analyzer shows 1.6:1 match, 50 ohms on impedance meter and x=22. The noise from the speaker gets lower when I touch the radio. I'm wondering if some bonding is needed from door to door frame?
     
    delta5, Aug 16, 2017
    delta5, Aug 16, 2017
    #1
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  3. Aug 16, 2017 #2
    jessejamesdallas

    jessejamesdallas Road Train Member

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    Yep....x=22 ain't all that good either...X needs to be 0.

    May run a ground strap off the radios mounting bracket, or from one of the radios side mounting screws to a good grounding point under the dash somewhere too.
     
    jessejamesdallas, Aug 16, 2017
    jessejamesdallas, Aug 16, 2017
    #2
    rabbiporkchop Thanks this.
  4. Aug 16, 2017 #3
    rabbiporkchop

    rabbiporkchop Road Train Member

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    @ what frequency does X=zero?
     
    rabbiporkchop, Aug 16, 2017
    rabbiporkchop, Aug 16, 2017
    #3
  5. Aug 16, 2017 #4
    delta5

    delta5 Road Train Member

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    Not sure. I will have to check that tonight.
     
    delta5, Aug 16, 2017
    delta5, Aug 16, 2017
    #4
    rabbiporkchop Thanks this.
  7. Aug 16, 2017 #5
    rabbiporkchop

    rabbiporkchop Road Train Member

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    If x=zero and r=28 at a usable frequency, a shunt match can make r=50 without affecting X.
     
    rabbiporkchop, Aug 16, 2017
    rabbiporkchop, Aug 16, 2017
    #5
  8. Jan 14, 2018 #6
    VolvoTerry

    VolvoTerry Light Load Member

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    Did you fix this issue? I used a similar set up a few years ago and found grounding strap from the door to the cab to the frame solved the issue.
     
    VolvoTerry, Jan 14, 2018
    VolvoTerry, Jan 14, 2018
    #6
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