I can't answer this question, but it brings up a question I had about
upgrading two of these antennas myself. I am contemplating doing the
same since they have become intermittent. My question is will the
tuning change if I replace the loading coils with better inductors having
lower loss even if the inductance remains the same. I intend to measure
the inductance and do something similar as Steve has asked. Either that,
or just beef up the connections and leave the loading coils alone. I wonder
what the real gain would be with better inductors. Perhaps there is a trade off
between bandwidth and gain here?
Thanks!
Chuck...K1KW
-----Original Message-----
From: Steve Miller <millersg@dmapub.dma.org>
To: towertalk@contesting.com <towertalk@contesting.com>
To: <towertalk@contesting.com>
Date: Friday, August 31, 2001 4:58 PM
Subject: [TowerTalk] Weatherproofing for copper coils?
>
>Towertalkers,
>
>I am upgrading Cushcraft 402-CDs. The plan is to replace the stock
>loading coils with high-Q coils made from 1/4 inch copper tubing.
>I'd prefer to apply a low loss protective coating directly to the
>copper tubing rather than construct housings for the coils.
>
>Heat shrink tubing seemed a possible solution but finding the right
>combination of UV resistance, low RF loss, and price has been
>unsuccessful. (PTFE heatshrink has good properties but runs almost
>$2/foot.)
>
>Are there any low loss paints or coatings that adhere well to copper
>and can withstand a north Texas environment for several years?
>
>Any suggestions on how best to weatherproof the coils is welcome....
>
>
>Steve
>
>
>
>--
>Steve Miller N8SM millersg@dma.org http://www.dma.org/~millersg
>
>List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems,
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>
>-----
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>
List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems,
Trylon Titan towers, coax, hardline and more. Also check out our self
supporting towers up to 96 feet for under $1500!! http://www.anwireless.com
-----
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