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Re: [TowerTalk] 4 square (Rex Turvin) (info and history fr DAVIS RF Co.

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 4 square (Rex Turvin) (info and history fr DAVIS RF Co.
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Thu, 23 Jul 2015 12:25:28 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Thu,7/23/2015 9:28 AM, Stephen Davis wrote:
  see the data out there for tuning those 4 cables, 75 ohm nominal coax,  with 
a fairly high VP in order to make the required length and tuning involved.  We 
have that coax cable available

I recently bought a spool of Steve's 75 ohm RG-11 foam to feed my high dipoles. I also measured it with VNWA and dumped the data into AC6LA's ZPlots to get the fundamental transmission line properties for it. It's very nice stuff. Vf is 0.84 at VHF, attenuation data is within measurement accuracy of Belden's published data for 8213.

73, Jim K9YC
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