I agree with Ken, with only one option, and that would be if the conduit is
open on both ends.. allowing free air flow thru. That situation, MAY help dry
the water from sitting on the cable, depending on the average humidity at the
underground temp. Warm air from inside.. to cold air outside may not work out
well either.
Have a great day,
--... ...-- Dale - WC7S in Wy
"Actions speak louder than words"
1856 - Abraham Lincoln
________________________________
From: Topband <topband-bounces@contesting.com> on behalf of Ken Claerbout
<k4zw@verizon.net>
Sent: Thursday, October 5, 2017 6:19 AM
To: topband@contesting.com
Subject: Re: Topband: underground cables question
As you have found out, it's impossible to keep water out of a conduit like
that. I use direct bury cabling and put it directly in the ground. Granted
the cable is flooded, but putting in back in the conduit ensures it will sit in
some water, something I would try to avoid.
73
Ken K4ZW
-----Original Message-----
From: John <beaumonts@beaumonts.karoo.co.uk>
To: topband <topband@contesting.com>
Sent: Thu, Oct 5, 2017 4:11 am
Subject: Topband: underground cables question
Hi all, some years ago I buried a 4 inch conduit about a foot deep in my field
, inside I run a control wire and a coax line RG213 to a 160 m vertical the
feeder was a total of 5/4 wavelength long about half of it in the conduit, it
was used as one line for a pair of verticals spaced 5/8 wave apart. When first
installed it worked very good but after a while I noticed it dropped off and I
suspected water ingress. An insulation test with 1000v from my electricians
test equipment showed indeed a fall in insulation resistance.
So my question is I have a couple of large reels of commscope F1160 BEF flooded
75 ohm
do you think I could put it in the same conduit which has allowed some water in
or would you make alternative arrangements . I realise it a direct bury coax
but appreciate advice.
I wish to get the two verticals going again will use 1 X 3/4 line above ground
1x5/4 line part in conduit and a 1/2 wave to switch in and out above ground.
regards
John Beaumont
G4EIM
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