six meter big wheel design

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by W8NSI, Aug 12, 2019.

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  1. W8NSI

    W8NSI Ham Member QRZ Page

    I have looked and cant find anything on this. Lots of halos/squalos, etc.
    Has anyone found or developed a formula for the length of each loop of the big wheel?
  2. W9GB

    W9GB Ham Member QRZ Page

    The Original Big Wheel article was published in the September 1961 QST magazine.

    “The Big Wheel on Two”
    by R. Mellen, W1IJD, and C. Milner, W1FVY
    QST magazine, September 1961, pages 42-45.

    The 1961 authors describe the horizontal polarized antenna as three full wavelength (λ) loops with a parallel connection at the central hub and feed point.
    In the 2008 QST article, L.B. Cebik disagrees, “their description proved to be off target. In fact, the antenna is a continuous loop with three high-impedance feed points ...”.

    Cebik and Cerreto further comment that “many amateurs had difficulty replicating the design because the antenna’s dimensions are critical at every point. Small changes in the leg (transmission line) spacing or even differences in the tubing curvature at the rim could throw off the impedance values at the hub.

    A New Spin on the Big Wheel
    by L. B. Cebik, W4RNL and Bob Cerreto, WA1FXT
    QST Magazine, March 2008
    Wimo Antenna & Electromics (Germany) still makes a commercial “Big Wheel” antenna.
    Big Wheel antennas by WiMo are made of aerospace aluminum, all other hardware is made of stainless steel. The antenna gain is approx. 3dBD, each Big Wheel has a N-jack (female).
    By vertical stacking of two Big Wheels you get a gain of approx. 5dBD.

    The 6-meter version is about 10 feet in diameter.
    Big Wheel Product Page

    Manual is bilingual (German first, then English)
    SSB Electronics USA sells the Wimo antenna for North America radio amateurs.
    Big Wheel Antenna
    The Olde Antenna Lab
    Dave Clingerman, W6OAL
    41541 Dublin Dr.
    Parker CO 80138
    Tel: 303-841-1354
    Last edited: Aug 12, 2019
    K5VWZ and AK5B like this.
  3. AK5B

    AK5B Ham Member QRZ Page

    Close; 3.6 meters=11.7 feet
  4. W8NSI

    W8NSI Ham Member QRZ Page

    Thanks for the info. According to their web site the 6 meter version is no longer in stock.
    I guess I will make a 2 element quad to play with on 6m instead.
    tnx and 73 jim w8nsi
  5. AK5B

    AK5B Ham Member QRZ Page

    I wasn't even aware that Wimo or anyone made a 6m Big Wheel until K9GB posted the info earlier. Too bad they're out of stock; such a cool piece of aluminum to put up into the sky.

    Before you build or buy a 2 el. quad you might want to consider a simple-to-make double H-bay wire beam. They're bi-directional yet have the same gain as a 2-el Moxon and radiate horizontally (despite it's tall vertical layout). I use two suspended from different trees to cover most directions (they have around an 88-degree beamwidth X2). Nothing wrong with a quad at all but an HDB is an easier and effective alternative to consider (especially for the VHF bands sice they are by nature a tall beast). Mine are about 13 1/2 feet tall by 28" wide; one for say, 40m would require a mature Redwood for support:D
  6. W4OP

    W4OP Ham Member QRZ Page

    If you want to take advantage of any of the NEC modeling programs you will find that the big wheel has no more gain than a well designed halo/loop. Just a lot more complex.

    Dale W4OP

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