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

[Les Kalmus]

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 at 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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