Ball mount with SO239

Discussion in 'Ham Radio Discussions' started by W5DMG, Nov 6, 2012.

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  1. W5DMG

    W5DMG Ham Member QRZ Page

    I have been looking for a ball mount for my car that has an SO239 to mate with the antenna.
    But no one makes them, at least not yet.
    I emailed Jerry Breedlove about why these are not common.

    He said he has had many requests for them, but he had not found a way to make it.
    I told him I thought to just attach an SO239 chassis mount to a flat surface of the ball.
    Make sure that the center conductor of the 239 connects to the ball. Then attach a
    insulated wire to 1 of the 4 holes of the chassis mount and run it outside to the
    back plate. I was not real sure if that would work, but sounded proper.

    He replied back :

    I am looking for feedback on his reply...
  2. KY5U

    KY5U Subscriber QRZ Page

    The problem is that the ball mount is basically the center of the so239. The thread should be ground, but in the typical ball mount, the coax ground is attached to the car chassis and the center conductor to the ball. See the problem? The threads for the SO239 are sitting up on the ball with no way to get a ground from the chassis of the car down at the bottom. You can no doubt homebrew something.
    Last edited: Nov 6, 2012
  3. WA7KKP

    WA7KKP Ham Member QRZ Page

    au contraire, they were made. My dad had one, made by Master Mobile. Might have been an add-on, as it would bolt right over a standard sized ball mount. And I had one that was (I believe) made by Antenna Specialists.

    Why don't you do a little homebrew, starting with a soup can or similar item. If you're handy with snips, you could whittle one out in an hour or so. Just add an SO-239 jack, or maybe using a threaded barrel, and extend the screw with some running thread long enough and fat enough to fit snugly in the end. Or put it out the side, depending on what you need.

    Having it (or not) won't make much difference in your mobile installation, except make it look kinda spiffy. Most hams simply peeled the coax back and attached it with lugs.

    Gary WA7KKKP
  4. KY5U

    KY5U Subscriber QRZ Page

  5. K9STH

    K9STH Ham Member QRZ Page

    Ball mounts with an SO-239 were definitely manufactured for commercial two-way services in at least the 1950s and 1960s and probably later. Somewhere I have one such mount that was used in a low band system.

    Glen, K9STH
  6. WA4BRL

    WA4BRL Ham Member QRZ Page

    High Sierra makes it and it's only seventeen bucks!



    To see the web site/advert, CLICK HERE
  7. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    I looked at the High Sierra one, too, and can't figure out how the outer conductor of the coax gets grounded anywhere since it appears to be attached directly to the plastic insulator of the mount and not to the grounded ring...

    An accident? Or maybe something going on we can't see?
  8. W5DQ

    W5DQ Ham Member QRZ Page


    If I understand what he is looking for, the SO239 needs to be on the other end of the ball mount where the antenna attaches, not the coax. Some antennas have a PL-259 type of connection that screws onto a matching SO-239 mount.

    I could be wrong but that the way I understand what he is describing.
  9. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    You might be right.

    A UHF connector will never support an HF antenna, though, other than maybe a short Hamstick. Maybe. It's not designed to be a mechanical support, that's why God made 3/8"-24 stainless steel studs.:eek:
  10. W5DQ

    W5DQ Ham Member QRZ Page

    The infamous ATAS-100 and ATAS-120 mini-screwdriver antennas from Yaesu both use a PL-259 mount format. I had one (-100) for a while and used the Diamond K400 trunk mount and had limited success with it. A buddy tried the same mount with a -120 and could never get it to work correctly.

    Gene W5DQ
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