[TowerTalk] Isolating adjacent 4-Squares
mpridesti at yahoo.com
Sun Dec 20 14:21:44 EST 2020
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.
> 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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