Homebrew HF multi-band log periodic?

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by AE7F, Dec 27, 2011.

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  1. AE7F

    AE7F Ham Member QRZ Page

    Anyone ever tried to build one?
     
  2. KC5FM

    KC5FM Ham Member QRZ Page

    I have not but here are plans, if you want to try yourself.

    73
     
  3. W9GB

    W9GB Ham Member QRZ Page

  4. AE7F

    AE7F Ham Member QRZ Page

    Very cool, thanks. This is interesting:
    loghf2big.jpg

     
  5. AE7F

    AE7F Ham Member QRZ Page

    Thanks. I have been looking at Tennadyne antennas for awhile (antenna comparisons.xls). You can see that I found the T6 to be a very, very nice antenna for the price and have been looking around for one.

     
  6. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Unless you have access to the materials for very discounted cost, it would be hard to beat the price of even a new Tennadyne.

    Seamless aluminum 6061T6 alloy tubing is expensive, and the T6 uses a lot of it, including 24' of extruded square boom stock and about 160 feet of round tubing of various snug fitting diameters, plus several precision cut insulating blocks, thick machined PVC insulating blocks at the mast mounting point, etc. It would make an interesting project, but certainly not an inexpensive one.
     
  7. AE7F

    AE7F Ham Member QRZ Page

    Yeah, their pricing is good for the T6 but one does wonder what materials would cost for the aforementioned LP design.

    http://www.texastowers.com/aluminum_.htm

     
  8. KO6WB

    KO6WB Premium Subscriber QRZ Page

    The ARRL Antenna Handbook has detailed instructions also at least mine does. You could try that. You might also want to pick up a copy of the handbook, the older ones are somewhat better but I don't know if they have the LP plans in them.
    Hope this helps
    73
    Gary
     
  9. VK2FXXX

    VK2FXXX Ham Member QRZ Page

    Wire LPDA

    You might consider a wire type LPDA?
    Maybe a 40ft boom and 12+ elements.
    See Cebick W4RNL site for some big LPDA designs.
    If it does not work well take it all down and use the boom as another antenna mast!!
    The rear spreaders as the basis for a rotatable dipole etc.........
    I would love to try one one day.Might need a bigger back yard though!
    Good luck
    Brendan
     
  10. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Using those costs, the aluminum tubing would run about $280. Then you'd have to cut it in three dozen places and drill it it 36 places to join the elements, and 12 more places in the booms to insert the elements. You'd still have to create mast to boom brackets, PVC insulating spacers, and the big PVC mast clamp insulators, plus add several dozen SS screws, bolts, etc.

    It could probably be built for about $350 worth of parts, not considering shipping costs for the tubing.
     
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