[TowerTalk] Isolating adjacent 4-Squares

[K9MA]

Charlie,

Are you sure it is not the tower itself that is degrading the 
performance of the 4-square?  If so, you may be able to detune the tower 
with a gamma match. That worked on 160 for me with a 70 foot tower and 
an array of loops. It did not work on 80, apparently because the tower 
was just too big.

73,
Scott K9MA

On 12/20/2020 1:21 PM, Mpridesti via TowerTalk wrote:
> Charlie
>
> Thought I had a similar challenge and built a box with 4 spst relays mounted right at Comtek box that when powered, would short out all 4 elements of the 80 m 4 sq At the end of the 1/4 wave lines. Effectively creating an open circuit connection at each feed point.
>
> Unfortunately it did not work for me, but does so at places like K3LR.
>
> Regards,
>
> Mark, K1RX
>
>
>> On Dec 20, 2020, at 12:23 PM, Charles Morrison <junkcmp at gmail.com> wrote:
>>
>> I have an 80M wire 4-square around tower #1. (90ft with two big 10M & 15M
>> monobanders) Each vertical has 12 above ground radials and is tuned to
>> 3535. All guys are broken with insulators.
>> This array works well.
>>
>> My second version of a 160M wire 4-square around tower #1 was raised last
>> week. They are Inverted L's  to a 120ft tower. It already has two Cushcraft
>> 40-2CD's and a big homebrew 20M6L OWA yagi. All guys are broken with
>> insulators. Each Inverted L has 20 on-ground radials and is tuned to 1725.
>>
>> The closest 80M element is 40 feet from a 160M element.
>> The 160 is not working well. I will be testing the phasing lines once this
>> snow melts. ###
>>
>> I want to apply a passive device to further isolate these systems. I'm
>> thinking of a 1/4 wave 50 ohm shorted coaxial stub on each feedpoint. My
>> first guess is the 160 elements.... ?
>>
>> Alternatives are to move one of the arrays.... but I'd rather explore
>> making them work where they are.
>> -Charlie N1RR
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-- 
Scott  K9MA

k9ma at sdellington.us