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@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@sdellington.us
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