[TowerTalk] Coax

[TexasRF at aol.com]

Actually any type connector needs the water intrusion protection. Some  
types are inherently more resistant to water intrusion but none are totally  
water proof.
 
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.
 
73,
Gerald K5GW
 
 
 
 
 
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 
water  intrusion.
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
>
> 73
>
> Roger  (K8RI)
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