Ambitious antennas that underwhelmed

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by M0AGP, Dec 19, 2020.

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  1. AC6LA

    AC6LA Ham Member QRZ Page

    To model Nick's envisioned scenario in reply #26 I suppose it would be better to actually model a very dense, variable length, set of radials slightly above or slightly below a single ground medium of infinite extent. I'm not willing to take on that task but for anyone who would like to rise to the challenge the model file "Vertical with Tapered Seg Radials.weq" (see here) might come in handy. That model can be set to have 4, 8, 16, 32, 64, or 128 radials with the (common) length set as a variable.

    Dan, AC6LA
     
  2. UA3TW

    UA3TW Ham Member QRZ Page

    Here we can see three pictures for 20m band. Small picture is Real ground setup for the case. There are 360 radials 21.2 m long on an average ground. Left big picture is radiation pattern for 5.2m high vertical in this environment. Right big picture is radiation pattern for 2.6m high vertical in the same frequency 14.15 MHz and environment.
    Perhaps that is why DDRR antenna works so well
     

    Attached Files:

    M0AGP likes this.
  3. KB1CKT

    KB1CKT Ham Member QRZ Page

    No, it's a flat top. Well, it is starting to droop a bit in the middle, as I did not tension it all way--wanted some slack for when it gets windy.
     
  4. M0AGP

    M0AGP Ham Member QRZ Page

    Super interesting! And helpful for us to develop intuition - thanks for posting this Dan
     
  5. N8FF

    N8FF Ham Member QRZ Page

    I have made several flavors of G5RV and haven't gotten good results from any of them.
     
  6. KI4YTV

    KI4YTV Ham Member QRZ Page

    DID YOU USE COAX? MINE IS 560 FT WORKS GREAT WITH LADDER LINE
     

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