Thanks John for teaching me something new! I modeled 2-stack array this
evening and you are correct - the performance & pattern are predicted to
tolerate quite a bit of phase shift before things start becoming
significantly distorted.
KM5VI
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
john@kk9a.com
Sent: Tuesday, November 12, 2013 8:05 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Determining coax length?
Can't you measure it on the tower? The length is not that critical, even
20 degrees out of phase shows little change in the pattern.
John KK9A
To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: [TowerTalk] Determining coax length?
From: Rich Hallman - N7TR <rich@n7tr.com>
Date: Tue, 12 Nov 2013 13:49:17 +0000
I am stacking several mono banders with a stackmatch II. I have the
antennas
mounted on the towers, but the coax feedlines are different lengths right
now.
The Stackmatch wants coax lengths to both antennas to be the same length,
but I'm unable to physically measure to the end of the feedpoints on the
boom.
All
coax is the same (RF Davis Buryflex)
Questions:
1) How critical are the coax lengths to the stackmatch from each
stacked
antenna?
2) What tools can I use to determine the length of coax to each
antenna?
(AIM 4170, MFJ, etc?) and how do you determine equal lengths?
Thanks...
Rich
Rich N7TR
ex KI3V, N3AMK, WB3JOV
www.n7tr.com<http://www.n7tr.com>
http://www.qrz.com/db/N7TR
Telnet: dxc.n7tr.com N7TR DXCluster
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