RW4HFN Antennas

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by RW4HFN, Oct 11, 2020.

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  1. RW4HFN

    RW4HFN Ham Member QRZ Page

    Hello! Welcome to my page on QRZ.RU!
    Ready to answer for any question about my antennas.
     
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  2. M0AGP

    M0AGP Ham Member QRZ Page

    Thank you for posting the link Igor. I see some interesting things in there - one that looks like a variation of a "fan vertical", and one that looks like an asymmetrical off center fed bowtie antenna for HF!

    Google translate struggles hilariously with some of the Russian - I doubt that any of your antennas have "hemorrhoids" for example :D
     
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  3. M0AGP

    M0AGP Ham Member QRZ Page

    Is this one (the Pyridon?) basically a fan vertical with a set of radials with loading coils? Interesting upload_2020-10-11_11-49-16.png
     
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  4. M0AGP

    M0AGP Ham Member QRZ Page

    Apologies - my mistake - this is the Pyramidon upload_2020-10-11_11-51-52.png
    I have definitely not seen this before! (For viewers: here is the link )
     
    Last edited: Oct 11, 2020
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  5. RW4HFN

    RW4HFN Ham Member QRZ Page

    Last edited: Oct 11, 2020
  6. M0AGP

    M0AGP Ham Member QRZ Page

    OK, interesting.
    And the AsDip looks like it is what we would refer to as an elevated "fan vertical", with three resonant vertical elements, but this antenna has a single tuned radial for every band, maybe with loading coils in the radials to shorten them? And we attach a choke (also called a "current balun") between the vertical and the coax to mainly stop common mode currents. Is this about right?
     
  7. RW4HFN

    RW4HFN Ham Member QRZ Page

    Absolutely. The coil shorts radial and adjusts it in the first approximation. Fine adjustment - by telescopic radial .
    We use simple cable choke about 1000 Ohm \ lowest working frequency. For example its 6-7 m of cable for 40m. Routine or exotic. )
    IMG_20200609_204818.jpg
     
    Last edited: Oct 11, 2020
  8. M0AGP

    M0AGP Ham Member QRZ Page

    Interesting. Do you find that shortening the radials using a loading coil decreases the bandwidth of the antenna, for example as measured by the distance in frequency between 2:1 SWR points?
     
  9. M0AGP

    M0AGP Ham Member QRZ Page

    Also on the Pyramidon, it is difficult to see exactly how the feedpoint works, as there are 4 wires going into that red circle. Can you give us some more info on the feedpoint connection please? Maybe a “zoomed in” view so we can see what connections are made?
     
    AK5B likes this.
  10. RW4HFN

    RW4HFN Ham Member QRZ Page

    Of course, decreases... But bandwidth of "standart" AsDip enough
    for HAMs (350 kHz \ SWR=2 on 20m). "Special" AsDip 2-3 times wider.
    Zoomed in. imgonline-com-ua-2to1-YPQRJxXcnL9b1YDp.jpg
     
    Last edited: Oct 11, 2020

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