President Texas 7/8 wave mobile antenna?

Discussion in 'CB Radio Forum' started by skellr, Oct 14, 2018.

  1. skellr

    skellr Road Train Member

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  3. handlebar

    handlebar Heavy Load Member

    No, not really. 7/8-wave at 27 MHz would be roughly 7 x 53 inches inches long, or 30.9 feet. And, since it wouldn't have a feed point impedance of 50 ohms, it would need an impedance matching coil, adding to its overall length.
    Not very practical on a mobile, guying needs aside. And remember, loading coils don't radiate.
    The only exception is when a coil is wound as a helix, and a 7/8-wave helix would still be really, really long.
     
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  4. skellr

    skellr Road Train Member

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    I ordered one out of curiosity. I'm hoping it will be easy to disassemble. I'd like to know what they did to get all that "length" in such a small package and still rate it for "7200 Watt P.E.P.".

    RW TEXAS USA - Radial Whip - CB Antennas - Group President Electronics USA
    Code:
    PRESIDENT recommends the use of a cable with a length less than 13 feet (4 m)
    Type antenna : 7/8 wave
    Inpedance : 50 Ohms
    Frequency : 26-28 MHz
    Polarization : Vertical
    S.W.R. value : 1.2/1 adjustable
    Maximum power : 7200 Watt P.E.P.
    Band width / Number of channels : 2400 KHz / 240 ch
    Length : 83.46 inches - 2120 mm
    Base type : Base 3/8
    Whip : AC4 Stainless steel
    Weather Channel Compatible :  Yes
     
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  5. jessejamesdallas

    jessejamesdallas Road Train Member

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    All they did was stick a loading coil inside the base of the antenna, just like Wilson, K40, Stryker, Sirio and all other mobile antenna manufactures do to get the height down...
     
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  6. rabbiporkchop

    rabbiporkchop Road Train Member

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    If they had an so239 version I'd buy one.
     
  7. skellr

    skellr Road Train Member

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    The European versions do.
    maxresdefault.jpg
     
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  8. skellr

    skellr Road Train Member

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    Ok, here we go. I was wondering about the barrel that was on the whip. It's just where they decided to split the whip. Nothing hiding in there, just a "joint".
    Just a couple of set screws and a pair of set screws at the base for adjustment. No Allen wrench supplied.

    Screenshot_20181015-163103.png Screenshot_20181015-163053.png

    I don't see 7/8 wave of of material in there....
     
    Last edited: Oct 15, 2018
  9. Slowmover1

    Slowmover1 Road Train Member

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    Given the name on the item, I’d expect pretty decent performance. And longevity.
     
  10. skellr

    skellr Road Train Member

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    I like how easy it was to pull apart from a mantenance aspect. No sonic welds or glue.
     
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  11. Slowmover1

    Slowmover1 Road Train Member

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    Longevity— as I think about it — may mean the most.
     
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