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[TowerTalk] RE: PL-259/N-type Connector Sealing

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Subject: [TowerTalk] RE: PL-259/N-type Connector Sealing
From: (Pat Barthelow)
Date: Tue, 13 May 1997 17:06:43 -0700 (PDT)
WARNING!  WARNING! Dr. Robinson!  (Remember "Lost in Space"_
The MFJ is VERY susceptable to false (High, or Infinite) readings due to 
nearby sources of RF.  I have a BC station on 630khz 1 mile away that 
makes the MFJ useless for real antenna measurements....
Good Luck!,   73, DX de Pat, AA6EG/N6IJ

On Tue, 13 May 1997, Dale Martin wrote:

> Thanks to all who sent me comments and suggestions.  The general 
> consensus for N-type connectors (and that is, indeed, what we found
> at the base of the antenna, this afternoon) is to seal them, in spite of
> their 'weatherproof' rating. 
> Since it has been discussed a couple of times before and I was dumb
> enough to not have saved the thread away properly, I will not reprise the
> responses on the reflector....if you want to know what the specific 
> comments were, I will be happy to respond directly with a summary.  
> By the way, the antenna is a G7-144, mounted on a 5 ft mast atop the
> penthouse (equipment/mechanical room) roof of a 9 story building at 
> Johnson Space Center.  It's been up there for at least 10 years.  
> On our arrival there, I saw immediately that the connector N-type 
> and was unsealed.  Fearing the worst, I removed the feed from the 
> antenna and, to my delight, found the female section nice and clean 
> and shiny; same with the male connector.  I put the end on a dummy 
> load and we ran swr checks from the repeater -- flat!  Nothing 
> reflected.  I put my MFJ-259 on the antenna and found infinity SWR.  
> We are replacing the antenna as soon as the new one (another 
> G7-144) gets here.  We will also seal the connector at the antenna 
> base. 
> 73,
> Dale Martin, KG5U
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