[SECC] Elavated radials

[K9AY]

Kevan,

The loops can be "too big". The size in the original article -- 85 feet of wire -- is the maximum for 80M; a bit more than 1/4 wave of wire. Any longer and it's not possible to get a deep null with just a resistor.

If you are most concerned with 160M, you can increase the size. I've had good results with 30 foot height and +/-20 foot width (about 115-120 ft of wire). The signal level is maybe 2 dB higher. I might note that the pattern does not change with loop size, just the signal level. 

I'm happy to answer any other questions you might have!

73, Gary
K9AY


  ----- Original Message ----- 
  From: Kevan Nason 
  To: secc at groups.io ; secc 
  Sent: Sunday, February 07, 2021 8:54 PM
  Subject: Re: [SECC] Elavated radials


  You can always find differing opinions -- and "facts". I found this to be both credible and logical.


  N6LF found elevated radials are good, but also gave this caveat:
  “…elevated radial systems are subject to a number of ills. They are very sensitive to details of layout, soil characteristics, nearby conductors, coupling to feed lines, and other factors. Like ground radials, elevated radial systems work much better if the screen is not too sparse: in other words, try to use 12 or more radials. You will be much happier”



  Some say a few feet up are good, but he recommends 6 meters up for 160 meters (about 20 ft)


  I too use K9AY loops for receiving. Took them down to remove some trees and haven't put them back up yet. Can anyone recommend a good place to go that discusses advantages of different loop lengths?  Like to research a bit before rehanging them.


  Kevan N4XL


  On Sun, Feb 7, 2021 at 5:09 PM Jeff Clarke <ku8e at ku8e.com> wrote:






    -------- Forwarded Message -------- Subject:  [SECC] Elavated radials 
          Date:  Sun, 7 Feb 2021 15:48:39 -0500 (GMT-05:00) 
          From:  Dave Thompson <thompson at mindspring.com> 
          Reply-To:  Dave Thompson <thompson at mindspring.com> 
          To:  aa4lr at arrl.net 
          CC:  secc <secc at contesting.com> 



    Bill,


    Elevated radials get mixed reviews.  John ON4UN (SK) used them with his 4 square antennas and I had a MULTEE with 4 revealed radials  made from the Spi-ro 50 foot radials with good luck helping me to 167 DXCC entities on 160 SSB.  Best DX was a UA0 in zone 25 across from JA.  I also have worked Japan on CW just wish they allowed SSB on 160.  Working DX on a one haft acre lot is possible but requires thing  beyong the box.


    Hope to be back on the air soon.  I have a Spi-ro 100 foot dipole I hope to put up at 65 feet as a dipole L.  My original version let me work PY3CEJ in South Brazil and a 5N0  easily through a big pile ups.  I got the only 5-9 from the 5N0 and only 20 over 9 from PY3CEJ.  I have the QSLs to prove this.


    Good luck es 73 

    Dave K4JRB

    >

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