I recommend direct bury rated cable. This has a polyethylene (PE) jacket which
is more
"waterproof" and "tougher" than PVC.
I don't know if the foam dielectric is open or closed cell foam. With closed
cell foam
there is no path for the water to get to the center conductor so a simple
resistance
check might not indicate a problem.
73, Roger
On 3/12/2016 10:56 AM, Chuck Dietz wrote:
If you have a digital ohm meter that can measure into the megohm range,
with bad coax you will see some resistance path between shield and ground.
Chuck W5PR
On Saturday, March 12, 2016, Dennis W0JX via TowerTalk<
towertalk@contesting.com> wrote:
Ed,
Moisture is very difficult to keep out of RG6 especially if it is the
inexpensive variety with a PVC jacket. This type of jacket is easily cut
and has pinholes in it.
It is very easy to know if you have had water ingestion. The shield
resistance will go up when the aluminum braid oxidizes. You can also
inspect it visually by removing a connector and stripping back a length of
the cover. The aluminum will turn grey and have a powdery oxidation on it.
This is ruined coax and you might as well throw it away.
Therefore, when ever possible, use a flooded cable. The next best thing is
a tri-shield RG6 which consists of three shields: foil around the foam,
followed by aluminum braid, followed by a final shield of foil then covered
by the jacket. Sometimes you can find it surplus at hamfests.
Commscope makes a Quad Shield, flooded RG6 and you can find large rolls on
EBAY. W0BTU has the Commscope part number on his website.
I have thrown out hundreds of feet of Home Depot RG6 that has gone bad
because of water migration.
73, Dennis W0JX
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