Hi Jerry,
Dunno about Matt Dillon (Kevin's) situation, of course. I had a 70 foot
Rohn 25G tower guyed at two levels. Lowest was 30 feet, highest at 60 feet.
Guy wires were galvanized steel but terminated in contraptions I got from
the local power company. They compressed the cable and had stainless loops
which would just fit around a tower leg. At the lower level, the loops went
directly around the three legs. At the higher level, I had fabricated three
sections of square, steel stock clamped to the tower legs with U-bolts and
with eye-bolts at the free ends. Each of these sections was about
three-feet long. The aforementioned stainless loops went through these
eye-bolts.
When I had pretty much determined that they might be the culprits, I went up
the tower and "wiggled" all those loops to wear away the corrosion. This
worked swimmingly well to completely eliminate the interference on 40
meters. I went back up the tower and clamped copper braid from each guy
wire to the tower itself. That served for years thereafter to prevent the
interference altogether.
I never noticed interference on bands other than 40 meters.
73, Mike -N4NT-
----- Original Message -----
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
To: <tentec@contesting.com>
Sent: Thursday, October 07, 2010 1:57 PM
Subject: Re: [TenTec] Century 21 Analog Question...
Certainly a possibility.
73, Jerry, K0CQ
On 10/7/2010 11:47 AM, Mike Hyder -N4NT- wrote:
I had a very similar thing on rigs in my shack. The trouble in my case
was
that the mechanical connections of my guy wires to my tower were not
bonded.
Apparently the oxidation in the joints served to create harmonics and
thus
third and fifth order intermod products of two or more local AM broadcast
stations. Probably not your trouble, but might give you an avenue to
follow.
73, Mike Hyder -N4NT-
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