[TowerTalk] Interaction Issues

[w5prchuck at gmail.com]

By: “the 6M in the middle, phased at 90 degrees to the other beams” do you mean it is mounted pointing 90 degrees off from where the others are pointing? 

Chuck W5PR

Sent from Mail for Windows 10

From: Jeffrey Cantor
Sent: Saturday, April 8, 2017 9:07 PM
To: towertalk at Contesting.com
Subject: [TowerTalk] Interaction Issues

 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
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