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Cant get Wilson 1000 to tune on pick up cab..

Discussion in 'CB Antennas' started by undertaker, Jun 20, 2019.

  1. undertaker

    undertaker Undertaker

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    use to never have any trouble. Now that the body is Aluminum Just don't seem to want to tune. It has to be in the 26MHz Range to even get close to 1.0 This is with my antenna analyzer.
    tried both 62 in stinger and 66 in stinger.
    Help Please!!!


     
    rabbiporkchop likes this.

  2. kopcicle

    kopcicle Sr. Member

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    Just a reminder that resonance is not vswr.
    Otherwise, doors and hood ground bonded?
     
  3. undertaker

    undertaker Undertaker

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    It worked fine on my other truck. Swr is like 2 to 3 on 27mgz..
     
  4. undertaker

    undertaker Undertaker

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    My 102 is 1.0 on all bands guess I will just stick to that...
     
    357magnum likes this.
  5. M0GVZ

    M0GVZ Sr. Member

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    CONGRATULATIONS!!!!!!!!!!!!!!

    And I mean that. What you're experiencing isn't showing a problem, in fact its showing the opposite.

    When you've a damned good RF ground you'll find that the antenna is resonant below the CB frequencies and usually by a lot. The better the RF ground the shorter the radiating element needs to be. Manufacturers design the lengths expecting them to be installed where there's a piss poor RF ground, such as using a magmount, so the whips are quite long as a result.

    I've got a drilled in roof fixed mount, bonded everything. With a plain whip with no loading coil in the mount the feedpoint impedance at resonance is just a fraction of an ohm above that of 36.8 Ohms which is what the feedpoint of a 1/4 wave with a perfect ground would be. Stock CB antennas on my car are typically resonant just below 26MHz when shortened as much as possible. I usually end up having to get the dremel out and cut 2-3" off the whips. My Sirio 5000 I had to cut 3 inches off.

    Aluminium is also has better surface conductivity than steel so that'll be benefitting too.

    You've got an antenna analyser, you've found where its tuned to, now is the time to get out the snips and cut the whip down.
     
    #5 M0GVZ, Jun 20, 2019
    Last edited: Jun 20, 2019
  6. nomadradio

    nomadradio Analog Retentive

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    Color me skeptical. I have come to associate the "tunes down at 26 MHz" with a bad ground, or with the use of a ground wire instead of sheet metal.

    If the SWR at 26 MHz is low, shortening the whip should work.

    And if the lowest SWR at 26 MHz is still 2 to 1 or more, that smacks of a ground-quality symptom.

    73
     
  7. undertaker

    undertaker Undertaker

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    It is a new Wilson roof mount Tight all the way down could it be inside the top pf the cab not get a good bite?
     
  8. Slowmover

    Slowmover Sr. Member

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    Here’s the excuse for the BREEDLOVE MACHINE puck mount (no, I don’t want to hear about the non-starter “vehicle value” thing, or how complicated it is to get to roof underside: pull overhead light fixture. Use fishtape to get Coax across the straight lines).

    Another here (Redbeard) had excellent performance with RF DAVIS “Buryflex” Coax in his truck tractor. (DX ENGINEERING has their own version). The run to the radio mount can’t have THAT many turns to it.

    Bonds are going to be key, IMO. The bed, alone, probably needs four. And the the exhaust pipe, it might need more than one. Doors, one or two. Hood, both sides. Etc. www.k0bg.com

    No reason that radio with a perm mount SIRIO isn’t the talkingest radio across Tom Green County and the ones surrounding. That’s CB nirvana for easy distances.

    I’m just up the road in Lubbock today on a 34-reset. Radio performance due to installation IS the problem once environmental problems are extra low.

    .
     
    rabbiporkchop and undertaker like this.
  9. Slowmover

    Slowmover Sr. Member

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    I’m ordering a 25’ DX ENGINEERING
    Dxe-400MAX Coax assembly for the Pete today (RF Davis Buryflex equivalent).

    Already have the AMPHENOL connectors I need. And a weatherproofing kit from them. Have now figured how to run Coax thru sleeper and cab.
     
  10. Road Squawker

    Road Squawker Sr. Member

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    Where is "X = 0"?
     
  11. M0GVZ

    M0GVZ Sr. Member

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    Nowhere, it has a matching section at its base. Best you can aim for is low single digits.
     
  12. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Undertaker check my old post below describing an old 105' foot RG8x feed line that had been installed on an A99 for about 5 years and I discovered it had been contaminated due to water...which had turned the shield green and black.

    Based on your story I think maybe you are experiencing very heavy losses in your antenna system just as others have already talked about regarding the lack of ground.

    See if you can do some continuity checks at various points on your truck without mucking up the finish too much.

    This is not to imply you have a feed line problem however.

    My antenna system...
     
    #12 Marconi, Jun 24, 2019
    Last edited: Jun 24, 2019
    357magnum likes this.
  13. jkp1

    jkp1 Member

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    I've had 2 Wilson 1000's go bad. One, the coil came loose on one end from hitting trees. The other one, water got into the coax at the base and caused the SWR to go way high.
     
  14. Slowmover

    Slowmover Sr. Member

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    Time for that new President Texas
     
    357magnum and undertaker like this.
  15. 357magnum

    357magnum Sr. Member

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    Bobby , The " Antenna God('s) have spoken . They got this Popcorn is Popping ! If they say it ... Gospel ! Too me anyway . I am not worthy .:)
     

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