I sure wish this thread had popped sooner. I dug a 100ft trench a few weeks
ago...was going to go with direct burial bu decided
to go the extra mile and put in some 3-in Sched 40 insteady. The risers come
out and I used those end-caps commonly used for
electrical cables servicing a house. It makes the cables exit the pipe
pointing down.
I ALMOST drilled some drain holes exactly for this concern, but for some reason
I decided not to. Should have gone with my
initial instinct.
-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065
On Wed Jun 13 13:05 , "Jerry Keller (K3BZ)" sent:
>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
>> [towertalk-bounces@contesting.com','','','')">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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>
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