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Re: [TowerTalk] 4 square for 80

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 4 square for 80
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Sun, 25 Sep 2016 14:35:46 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>

On 9/25/2016 12:48 PM, jimlux wrote:
> One could of course make the transmission lines 3/4 wavelength long,

Which would, in turn, reduce the bandwidth of the cables by a factor
of three and similarly increase losses in the cables which operate at
significant SWR both of which would negatively impact operation of the
4 square on a "wide" band like 80/75 meters.

73,

   ... Joe, W4TV


On 9/25/2016 12:48 PM, jimlux wrote:
One could of course make the transmission lines 3/4 wavelength long, and
have plenty of length to wrap dozens of turns on however many cores
spaced however frequently along the length of the cable.




On 9/25/16 9:25 AM, Jim Brown wrote:
I see.

73, Jim

On Sun,9/25/2016 5:41 AM, Joe Subich, W4TV wrote:
Jim,

The problem is that, in that application, the cables must be 1/4 wave
long electrically.  That already makes them shorter than desired and
"wound" chokes on each end would shorten them by another 5-7 feet
making the spacing of the 4 square much too small.

On Sun,9/25/2016 6:49 AM, Steve London wrote:

What problem(s) are we attempting to solve with chokes on the 4-square
feedlines ?

Noise.


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