To: <towertalk@contesting.com>
>Date: Thu, 19 Dec 1996 13:23:49
>To: Wendell - W5FL <w5fl@flash.net>
>From: William Barnes <wbarnes@tfs.net>
>Subject: Re: Feedline and control line protection
>
>At 10:49 PM 1/4/97 -0600, you wrote:
>>
>>Now I am concerned with the three coaxes (RG173/u or Times LMR400), three
8 wire control cables for rotator and switches, etc. Polyphaser says to
ground the shields of the coaxes at the base of the tower, but says not to
use non hard line coax because moisture gets in when you remove the pvc
jacket to ground the coax shield. They have very little to say about the
control lines and they should be important, also.
>>
>Take a look at the grounding blocks offered by Industrial Communications
Engineers in Indianapolis. They are heavy machined aluminum blocks that
clamp around the coax shield with a mating ground bar to attach to the
tower. They come with the appropriate anti-corrosion compound to smear
between the braid and the clamp. They also have other goodies-preamps;
"lightning arrestors" for coax, open wire, phone lines, and control cables;
and transformers to use surplus 75-ohm TV hardline. I have not ordered
from them for some time, but I hope they are still around--I will be needing
some of the blocks in the spring when my tower starts to grow.
>
>I won't add the "standard disclaimer." Hope this is somewhat useful info.
>
>73,
>Bill
>WB0NSQ
>
>P.S. I dug around in the right pile and found their phone number
1-800-ICE-COMM.
>
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