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Re: [TowerTalk] [Bulk] Re: 90 degree coax bend atop a crankup tower

To: towertalk@contesting.com
Subject: Re: [TowerTalk] [Bulk] Re: 90 degree coax bend atop a crankup tower
From: Les Kalmus <w2lk@bk-lk.com>
Reply-to: w2lk@bk-lk.com
Date: Sat, 06 Jun 2015 08:35:19 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
When using N connectors, always use ones with captivated contacts. On these, the center pin has an extra 'collar' towards the cable end which fits into a slot in the insulation material and keeps the pin in place. Standard N connectors have a center pin that does not have this locking design and will tend to migrate given the chance.

Les W2LK


On 6/5/2015 11:34 PM, Robert Harmon wrote:
OK,  I see the issue.   Like Rick, I used to use N connectors and abandoned 
them because of the center pin migration.
I now only use good quality Amphenol PL-259's and everything has been fine.
I am anal about sealing all the Pl-259 connections but that is another topic in 
itself.  hihi

73,
Bob
K6UJ



On Jun 5, 2015, at 8:15 PM, Richard (Rick) Karlquist <richard@karlquist.com> 
wrote:



On 6/5/2015 8:00 PM, Roger (K8RI) on TT wrote:


My experience shows "to me" that those using N-type connectors on
vertical runs without problems are quite lucky.

Coax with type N connectors is quite capable of center pin
migration in or out just laying on the ground.  About
20 years ago, I bought a bunch of 43 foot long 9913 cables
with type N's at a swap meet.  They came coiled up and I
just threw them in storage.  By now, every single one of
them has the center pins sticking out both ends like
pinocchio.  The ones that I used early on that got
straightened out for a while, but then were rolled up
did better.

I had some 500 foot runs of coax laying out on the ground
and over time, the center conductor migrated.

Going forward, I use PL259's exclusively to avoid this problem.
Except on my 7/8 inch coax.

Rick N6RK
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