The LMR400 DB is the flooded version. Great cable. The flooding material is
very sticky, but can be cleaned up with a bit of mineral spirits, and the
flooding compound doesn't seem to affect the ability of the braid to take
solder. The foam is bonded quite tightly to the center conductor so you have
to be careful not to nick the copper coating over the aluminum when trying to
get the foam off.
My brother uses the stuff underwater in a non-amateur application. They have
put the cut end of a cable into a pressurized water chamber and tested the
water penetration, and the flooding keeps the water out quite well.
73, Joe W0DB
-----Original Message-----
From: Paul Christensen [mailto:paulc@mediaone.net]
Sent: Wednesday, October 24, 2001 2:14 AM
To: W8JI@contesting.com; towertalk@contesting.com; Eugene Jensen
Subject: Re: [TowerTalk] Underwater coax
> I dislike 9913 (I think that is what it was) because the stuff I have is
> hollow and fills with water no matter how you seal it when
> horizontal.
Same here. In Florida, here's a typical 9913 failure: the coax begins to
heat to a very high temperature in the afternoon sun. Then, as is customary
during a summer afternoon, a cool rain develops out of nowhere betwen 3 and
4PM and rapidly cools the cable, thereby causing the air dielectric to
condense and super-saturate with moisture. I have tried several methods of
trying to keep this phenomenon from occurring but I eventually gave up and
threw it away in disgust.
Today, I use the LMR-400 series line. It's light, uses a copper-clad
surface aluminum center conductor (like CATV hard line), it contains a foil
and braided shield, uses a very low-loss, high voltage-rated dielectric and
has a long-life Class-II jacket. I understand that a flooded version of the
cable is now available for direct-bury applications. Pricing is similar to
Belden RG-213, but I've found the LMR line is a dream to work with. Solid
and stranded center conductors are available.
-Paul, W9AC
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List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems,
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supporting towers up to 100 feet for under $1500!! http://www.anwireless.com
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