[SECC] Elavated radials

[Kevan Nason]

Gary,

In regards to 160 loop length of 115 ft. Should the height of the bottom
part of the loop be the same 5 ft as when using the 85 ft loop length?

Kevan N4XL

On Mon, Feb 8, 2021 at 10:11 AM K9AY <k9ay at k9ay.com> wrote:

> 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 <knason00 at gmail.com>
> *To:* secc at groups.io ; secc <secc at contesting.com>
> *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> <thompson at mindspring.com>
>> Reply-To: Dave Thompson <thompson at mindspring.com>
>> <thompson at mindspring.com>
>> To: aa4lr at arrl.net
>> CC: secc <secc at contesting.com> <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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