Where to buy a non-conductive 3/8"-24 threaded mast?

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by K3RW, Oct 21, 2017.

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  1. K3RW

    K3RW Premium Subscriber QRZ Page

    I'm looking to run my eFactor dual-band horizontal omni antenna mobile and I'd like to find a non-conductive mast to fit in my mobile mag-mount. Its 3 big magnets and holds my Hustler super resonator antennas easily.

    Eventual plan is to mount the eFactors on a trailer hitch and have them above the car. I wouldn't use a 3/8" mast for that, it would need to be much more durable.

    But for mounting in the mag-mount, is there a source where I can buy a 3/8" threaded mast (I think this is 24 pitch), perhaps fiberglass or something, that I can screw into the base and clamp my antennas to it? I wouldn't need it to be longer than 3-4 ft. So far I've not seen anything that is non-conductive that is also threaded.

    I can always use threaded rod, but I'd prefer it to be non-conductive if I can find it. I'll be running a mobile vertical so I'd like to vertical mast to vertical antenna interactions.
     
    KC1OCA likes this.
  2. K8ERV

    K8ERV QRZ Member QRZ Page

    You may have to thread a plastic rod? I suggest Lexan (polycarbonate) if you can find it, very strong. A glass shop
    may have some.

    TOM K8ERV Montrose Colo
     
  3. W9GB

    W9GB Ham Member QRZ Page

    Threaded Nylon Rod exists from Small Parts (an Amazon company for past 15 years)
    and U.S. Plastics.
    http://www.usplastic.com/catalog/item.aspx?itemid=24519&catid=0&clickid=popcorn

    The problem with 3/8” is that 16 threads per inch is UNC —more common.
    3/8-24 is UNF.
    https://www.engineeringtoolbox.com/unified-screw-threads-unc-unf-d_1809.html
    ===
    You can also use Delrin (Acytel), which has been used as an antenna insulator with other antennas.
    http://thermoprene.com/plastic-extrusions/delrin-threaded-rod-tube-and-connector/

    K-Mac Distributing (Michigan)
    http://kmac-distribution.com/threaded-rods/acetal-delrin.htm#.WetHDLpOmhA

    How to Cut Threads in Plastic (Composite) Rod
    http://majoripc.com/how-to-thread-plastic-rods/

    gb
     
    Last edited: Oct 21, 2017
    K3RW likes this.
  4. WB3BEL

    WB3BEL Ham Member QRZ Page

    I'm not understanding something.
    These antennas are horizontally polarized ?
    Why do you need insulated mast for them?

    Most horizontally polarized antennas have been designed to work with conducting mast support.
    Are these different in some way?
    How is the coax cable feeding them not like a conducting support?
     
    AK5B likes this.
  5. W1VT

    W1VT Ham Member QRZ Page

    E Factor antennas are designed for a metal mast.
     
  6. AK5B

    AK5B Ham Member QRZ Page

    M2 used to make 3' fiberglass masts with 3/8thx24 mounts for satellite stuff; check their website as I suspect they probably are still available.
     
    K3RW likes this.
  7. N8CMQ

    N8CMQ XML Subscriber QRZ Page

    If you are going to run it mobile, you may want to reconsider using steel, as plastic may be too weak to trust.
    As far as RF goes, conductive or not, there isn't going to be any benefit for a non-conductive mast.
     

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