TexasRF at aol.com
TexasRF at aol.com
Tue Apr 13 15:15:08 PDT 2010
Actually any type connector needs the water intrusion protection. Some
types are inherently more resistant to water intrusion but none are totally
I have the green and corroded parts from many N connectors to back that
up. Some were even sealed with the highly regarded heat shrink with glue
inside. I recently recycled a few N connectors that were sealed with the heat
shrink/glue combo and in places, some of them had no adhesion of the glue
inside. These connectors were placed into service maybe 10 or 12 years ago.
I suspect that the hot/cold cycles from summer through winter caused the
release of the glue.
Other connectors protected with the stretchy linerless rubber sealing tape
have had no seal failures over a similar time span.
We go have quite high humidity here in Texas and that no doubt makes for
problems like this. I have even seen water condensation inside the hollow
center conductor of 7/8" Heliax. When the water oozes by the screw in center
pin and collects around the connector center pin it does make for vswr
issues, especially at VHF/UHF.
The fix for this problem is wrapping the center pin of the connector
threads with Teflon plumbers tape before screwing it into the center conductor.
Works for 30 psi water pipes and it works for Heliax.
In a message dated 4/13/2010 4:56:50 P.M. Central Daylight Time,
w2lu at rochester.rr.com writes:
Just remember that if you use 259's be sure to seal them up good against
Gene / W2LU
----- Original Message -----
From: "Roger (K8RI)" <K8RI-on-TowerTalk at tm.net>
To: "Tower and HF antenna construction topics." <towertalk at contesting.com>
Sent: Tuesday, April 13, 2010 5:26 PM
Subject: Re: [TowerTalk] Coax
> Martin Staffa wrote:
>> LMR 400 at the least for a 500ft. run Times wire has a graph you can
>> use for their products N connectors for sure.
> If not on UHF I don't see any reason for N connectors. UHF connectors on
> HF have so little loss you'd never know they are there. I have as many
> as 14 in each run from the rig to the antennas on top of the tower
> Roger (K8RI)
>> TowerTalk mailing list
>> TowerTalk at contesting.com
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