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DIYing a QRO cobwebb

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by AK5B, Feb 7, 2012.

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  1. G3TXQ

    G3TXQ Ham Member QRZ Page

    @KD5SPX: If you do decide to use the "folded dipole" design, don't try using the twin lead as part of the feedline; it typically has a characteristic impedance of 100-200 Ohms and that will make it difficult to achieve a low VSWR.

    73,
    Steve G3TXQ
     
  2. OM5GT

    OM5GT QRZ Member

    Cobweb antenna I tested on all five bands. Six years ago my storm broken spider Quad. Cobweb to last.
    The antenna has very good reception without interference. No problems receiving power from 750W Hex Fet and PA - of 20 meters above the ground brings great pleasure and play.
    Hats off to the we give authors the antenna ...
    small pictures: http://www.om5gt.szm.com/cobweb2/target0.html
     
  3. AK5B

    AK5B Ham Member QRZ Page

    Tallest tower-mounted cobweb I've ever seen---looks good!

    73, Jeff
     
  4. OM5GT

    OM5GT QRZ Member

    Thanks Jeff ...
    Here we can still compare the parameters of the dipole, verticale versus the cobweb all in the position 20 m above the ground:
    Far field plots cobweb antena (MMANA-GAL) http://www.om5gt.szm.com/cobweb3/index.html
    73 Robert
     
  5. M0AUW

    M0AUW Ham Member QRZ Page

    The opposite of high; Over the past few days I've had to drop my cobweb down to 10ft due to the current gales we've just had in the UK. Managed to have a quick QSO with a VK station this morning....... just shows what great antennas they are...mounted high or low!
    73s - Dick
     
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