Thanks for all the responses...
To answer all the questions...
Inverted V was up when I made the initial measurements
Yagi was pointed at EU for both checks...I'm in the Northeast. Turning the
antenna 360 degreees makes no difference.
The day before I checked it we had about 2 inches of rain. Prior to that I
believe the ground was pretty much frozen. There is probably still a lot of
moisture in the trees surrounding the tower.
And tomorrow is predicted to be a sunny day and mid-40s so I'll get out and
drop the 160 low dipole.
Thanks to all...
Doug - K1ZO
----- Original Message -----
From: "Doug Scribner" <dscribner@myfairpoint.net>
To: "Towertalk" <towertalk@contesting.com>
Sent: Tuesday, December 03, 2013 10:24 AM
Subject: [TowerTalk] Change in SWR
I know, I probably should not get too hung up about this, but...
Six weeks ago I finished my second tower... 66 feet of guyed Rohn 45. I
have a Mosley Pro-67B @ 68 feet and an 80 Meter Inverted V, with the apex
at 64 feet.
Following the completion I went through all of my antennas and checked the
SWR at various places in the bands. I wanted a "baseline" to make
comparisions to should anything go wrong.
About a week ago I made a few spot checks. The only significant change
that I found was on the Pro-67 and ONLY on 40 Meters.
Initial check - 7.0 - 1.6, 7.1 - 1.4, 7.2 - 1.5, 7.3 - 1.5
New check - 7.0 - 1.8, 7.1 - 1.9, 7.2 - 2.2, 7.3 - 2.1
All other bands/freqs are VERY close to what they were initially.
On the Mosley, the 40 Meter driven element is shared with 12 and 17. The
director is shared with 10, 15 and 20. My guess is that a yagi problem
would affect these other bands.
The only addition I have made is to add a 160 Meter Low Dipole for
receive. It is 10 feet high with the feedpoint at the tower.
Is there a chance that it is interacting with the yagi 58 feet above it? I
grounded the feedpoint of the dipole with no change.
I know I should drop the dipole to the ground but it was such a hassle
snaking it through the woods I have held off doing that.
Any advice?
Thanks and 73
Doug - K1ZO
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