Hi Jim, I have experience with 7/8" Heliax water condensation inside the
center conductor. In my case, I found that wrapping the center pin threads
with a couple of layers of teflon plumbers tape before installation stopped
the problem.
I don't know if that merely kept the water inside the center conductor or
actually stopped the ingress of water vapor which prevented collection of
water droplets. In either case, it stopped the problem.
In commercial systems, they pressurize the coax with dry air or nitrogen
and the positive pressure keeps water vapor out of the cable. Apparently the
center conductor is also protected with this procedure.
The positive pressure prevents the back and forth flow of water vapor due
to heating/cooling cycles and this stops the accumulation of water
condensation.
Can't comment on LMR1200, no experience with that.
73,
Gerald K5GW
In a message dated 12/1/2010 9:37:36 P.M. Central Standard Time,
jim.thom@telus.net writes:
OK, what's the procedure to prevent condensation from forming inside
the center conductor of either LMR-1200 [which uses a hollow cu tube for a
center
conductor].... or ditto with 7/8" heliax ??
Are we supposed to blow dry nitrogen / dry air / hot air down the inside
of the CU tube 1st..for a few minutes, before installing 7-16 dins on
each end ?
My thought was if any high humidity air was 1st blown out, before
connector's installed, coax installed, and connector's are water proofed, then
we should have minimal problems down the road.
Is my plan a waste of time ?
Later.... Jim VE7RF
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|