I have PVC conduits under my yard because the cables to the towers travel
under landscaping and I am not able to dig things up to change or add
cables. I have placed a length of half inch hose in each conduit with one
end at the lowest point in each conduit. The other end of each hose comes
up to the surface along with the coax lines and control cables at the base
of each tower. I use a "Wet/Dry" rated shop vacuum to pull the collected
water from the conduits via the hoses a couple times a year - and always
each fall before the ground freezes. This technique has been working well
for me for 19 years.
73
Lloyd - N9LB
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of John
Sent: Thursday, October 05, 2017 3:11 AM
To: topband@contesting.com
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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