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Thread: Virevent & Turbine advanced CP antennas tutorial.

  1. #21
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    Hi Hugo great tutorial thanks for posting this awesome job!

    Do you think that theres some issue if one just try to build this design with UT141 (im on 5.8GHz) and just keep the center conductor as "D"?

    I found some issues while tuning but apart from this there is something else that may shouldnt work using semi-rigid coax?

    Thanks in advance!

    Martin

  2. #22
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    I don't see any problem apart that the bigger center conductor will shift frequency up a bit.

    -Hugo

  3. #23
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    Thanks for your reply Hugo.

    Martin

  4. #24
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    Here are some pics of my first build of this antenna including also pics of some steps of the building process. It's actually a lot easier to build precisely and get good SWR than a cloverleaf/SPW; i got around 1:25 - 1:3 SWR, not bad for a first build ! My question is, what is the maximum effective gain for it ? Also, i would like to build a turbine, but i can't find the base wires angles... Thanks
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    Last edited by ecampos; 27th March 2012 at 07:24 AM.

  5. #25
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    Nice built ecampos, turbine angle is 45deg. Gain is in the approx 1.2db.

    -Hugo

  6. #26
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    Quote Originally Posted by ecampos View Post
    Here are some pics of my first build of this antenna including also pics of some steps of the building process. It's actually a lot easier to build precisely and get good SWR than a cloverleaf/SPW; i got around 1:25 - 1:3 SWR, not bad for a first build ! My question is, what is the maximum effective gain for it ? Also, i would like to build a turbine, but i can't find the base wires angles... Thanks
    Nice build, but with that level of precision, how would you possibly get worse SWR with a cloverleaf?
    Don't steal, the government hates competition.

  7. #27
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    Quote Originally Posted by volto View Post
    Nice build, but with that level of precision, how would you possibly get worse SWR with a cloverleaf?
    Humm... don't know exactly... Maybe i have some difficulties building that round side of cloverleaf/SPW's lobes. I prefer playing with straigth wires I'll give another try on the cloverleaf tonight...

  8. #28
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    So, just built my own turbine (1280mhz) and got almost 1.1 SWR !! Thanx again Hugo for this great design I'm hopping if you have the dimensions table for a Windmill using the old build method ? (the one from the virevent/turbine tutorial pdf on the first post of this thread, not the one using a single wire for each leg). Here's some pics of the building process:


  9. #29
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    My mind is blown at how strait you get those wires. How in the hell do you get them that strait? Nice work.
    Don't steal, the government hates competition.

  10. #30
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    Simple, twist them ! Here's my method: I attach one side of a wire to a vice and the other to a low speed drill and i twist the wire while gently pulling the drill towards me (do not apply to much power, as it will thin the wire) After a couple of turns, the wire gets straight... Then, while maintaining the tension on the wire, just cut it and you get a perfectly straight antenna wire ready to get cut and trimmed

    Quote Originally Posted by volto View Post
    My mind is blown at how strait you get those wires. How in the hell do you get them that strait? Nice work.

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