Towertalk
[Top] [All Lists]

[TowerTalk] Interaction Issues

To: "towertalk@Contesting.com" <towertalk@Contesting.com>
Subject: [TowerTalk] Interaction Issues
From: Jeffrey Cantor <k1zn@att.net>
Reply-to: Jeffrey Cantor <k1zn@att.net>
Date: Sun, 9 Apr 2017 02:07:34 +0000 (UTC)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
 I recently had some tower work done.  Ihave a Rohn 25 tower up 60 FT.  I have 
a C-3 and a 6-element Cushcraft 6Mon it.  Both antennas were doing fine – SWR 
essentially flat on the C-3and around 1.5:1 on the 6M.  They were both mounted 
on a 9 FT mast,separated by about 6 FT. The job was to replace the 9 FT mast 
witha 15 FT lighter mast and to install a new 12/17M WARC Cushcraft antenna.   
The new setup had the 12/17M antenna atthe top of the mast; the 6M in the 
middle, phased at 90 degrees to the otherbeams - – separated by roughly 6 FT 
between it and the lower C-3 and the WARC. After the install, I am noticing a 
2.0:1. 2.4:1 SWR on the C-3 on 20M only; 15M & 10M are OK.  On the 6M –3.0+ 
SWR. Do I have an interaction problem betweenthe 6M and C-3? Should the 6M be 
at the top of themast?  Offset to the others, or not? Jeff/ K1ZN
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
<Prev in Thread] Current Thread [Next in Thread>