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Base Avanti Sigma II

Discussion in 'CB Antennas' started by w9cll, Jun 25, 2020.

  1. w9cll

    w9cll W9WDX Amateur Radio Club Member

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  2. edfiero

    edfiero Member

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    Nice antenna but he is out of line on the price.
     
    Tokin likes this.
  3. KneeBiter

    KneeBiter Active Member

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    I'd buy that if he was local
     
  4. techradioman

    techradioman Active Member

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    Not even close to being worth it, the Penetrator or others are better at about 1/2 the price.
     
  5. w9cll

    w9cll W9WDX Amateur Radio Club Member

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    While I agree about the price the Sigma was a far better antenna then the Penetrator.
     
    dave457 likes this.
  6. Mudfoot

    Mudfoot Elmer

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    I'm glad I'm a cold-hearted, non sentimental dude with reactivate attachment disorder.
     
    wavrider likes this.
  7. Marconi

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

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    You're lucky Mudfoot, the cure requires you surround yourself with caring, consoling, nurturing, relatives, friends, and left leaning sociologists.
    .
     
    #7 Marconi, Jun 27, 2020
    Last edited: Jun 27, 2020
  8. Jay Mojave

    Jay Mojave Well-Known Member

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    Do you have measured field strength measurements to support this?

    Jay in the Great Mojave Desert.... "Next Gas 150 Miles"
     
  9. w9cll

    w9cll W9WDX Amateur Radio Club Member

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    nope just personal experience from days gone by
     
  10. Jay Mojave

    Jay Mojave Well-Known Member

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    Hello Cll: Rodger dat! Ive done some antenna comparison testing and when I find one antenna significantly hotter than another by 6 to 10 dB I know Ive done something wrong. Some sort of little animal eating one of the long lengths of coax, or one antenna not assembled correctly. The best one was NOT connected the coax to the antenna, oh good. A 179dB difference.

    Was hopping for some hot info here. When looking around at the different antennas and such I picked up Avanti Sigma II in pieces and I didn't like the internal design, as I think it wouldn't handle higher power levels, due to the close spacing of the internal wiring. But never tested it, due to missing parts. Probably a good antenna tho.

    Jay in the Great Mojave Desert.... "Next Gas 150 Miles"
     
  11. Marconi

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

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    I think I remember Bob85 claiming his Avante Sigma II was a very good 5/8 wave antenna back in the days.
     
  12. w9cll

    w9cll W9WDX Amateur Radio Club Member

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    Around here in Chicago Avanti was king, maybe it has something to do with the fact they were made here. While in my CB days I chose to run a Big Stick most of the other ops had a Sigma II up in the air.
     
  13. snippits75

    snippits75 Active Member

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    Friend of mine has one, and it works good. He calls it his whipping stick. Handles a Drake L4B just fine.
     
  14. Jay Mojave

    Jay Mojave Well-Known Member

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    Yes Avanti was a big deal back in the 60's and 70's people would drive all over to see a PDLII or Moonraker 4 or 6 go up Even custom Moonraker 8 elements went up, one not being to far from Henry Radio in Los Angles.

    The Penetrator 500 or SPT-500 usually arc over at the vertical element just as it comes thru the top insulator and can eat the insulator at around 3000 to 3500 watts. See Extreme CB, Big fuse in the sky. This is a good indicator of loss in the design. I am sure the Sigma 2 will also arc in its close spacing.

    Jay in the Great Mojave Desert.... "Next Gas 150 Miles"
     
    Marconi likes this.
  15. Marconi

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

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    Good information Jay. I just posted a question to Ranch55. He has a modification that may help solve the arc problem. See link below.

    New spt500 gamma
     

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