Topband: underground cables question

[Ken Claerbout]

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 at beaumonts.karoo.co.uk>
To: topband <topband at 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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