[TowerTalk] 4 square for 80

[john at kk9a.com]

75 ohm cable is used to match the low vertical impedance, does adding this
50 ohm choke section cause any issues with the 4 square?  Can you use
standard a 50 ohm choke in a housing such as
https://www.dxengineering.com/parts/dxe-bal050h10at?

John KK9A


Subject:	Re: [TowerTalk] 4 square for 80
From:	"Tim Duffy" <k3lr at k3lr.com>
Reply-to:	k3lr at k3lr.com
Date:	Fri, 23 Sep 2016 15:36:47 -0400

Hello Jeff,

I like using the W0IYH style of choke in this application. It has several K
ohms of CMI and goes right in series with the RG-11 line. In a 4 square the
W0IYH choke must use 75 ohm coax and it also becomes part of the phasing
line calculation for the 90 degree lines (typically cut for 3.650 MHz).

You can see it here:
https://www.dxengineering.com/parts/com-cfc-75

73,
Tim K3LR