In my experience, underground conduits without drain provisions will nearly
always accumulate leakage or condensate water faster than it can escape,
even if the ends are open. It's interesting that in the case being discussed
recently there was a rotor cable in the conduit that had no problems, yet
the SteppIR control cable did. We don'y know why yet, but I think your
suggestion is one possibility.... thanks.
73, Jerry K3BZ
----- Original Message -----
From: "Dan Hearn" <dhearn@air-pipe.com>
To: "Bill Carnett" <ah6fc@yahoo.com>; <towertalk@contesting.com>
Cc: <k3bz@arrl.net>
Sent: Tuesday, June 12, 2007 11:41 PM
Subject: RE: [TowerTalk] SteppIR problem-update from the front lines
> Seems there was some concern by one of the posters about cable capacitance
> effect on the motor pulses. I believe that water has a very high
> dielectric
> constant (around 80?). Could it be possible that water in the conduit
> causes
> shunt capacitance high enough to be a problem? Just a thought FWIW. 73,
> Dan, N5AR
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com]On Behalf Of Bill Carnett
> Sent: Tuesday, June 12, 2007 6:05 PM
> To: towertalk@contesting.com
> Cc: k3bz@arrl.net
> Subject: [TowerTalk] SteppIR problem-update from the front lines
>
>
> Aloha to all,
>
> Just got back from trying the splice at the base of
> the tower....works fine.
> As I was preparing the splice I noted how robust the
> insulation seems, i.e. doubt there could be any damage
> to the cable inside of the conduit. But also, how
> small the twisted pairs were...22 ga, however, I did
> learn that there are a number of 4 L and MonstIR yagis
> out there with control lines of > 500 feet. I did
> note a posting referencing a "heavier" cable for the
> longer runs, maybe I got the smaller cable??
>
> Anyhow, so far so good. We'll see how the new 500
> foot cable works, though I'm a bit reluctant to put it
> back into the conduit....perhaps there are evil humors
> down there? Hi Hi.
>
> Will keep the group posted. Thanks to all for the
> robust and very informative dialog...great learning
> experience for sure.
>
> 73, Bill
> AH6FC/7
>
>
>
>
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