[TowerTalk] Right Angle Connectors

[Roger (K8RI) on TT]

I took an Amphenol PL259 out of the new package and cut it apart. (Both 
the clear package and UHF connector say "Amphenol". None have a clear 
insulator.. The insulator was a white, slippery solid with a waxy 
feeling.  It sure looks and feels like Teflon.  No resemblance to your 
description.  Type N were the same. The only test left is the high 
temperature test to see what it breaks down into.

73

Roger (K8RI)

On 5/7/2016 Saturday 11:54 AM, jimlux wrote:
> On 5/7/16 7:01 AM, Richard (Rick) Karlquist wrote:
>> On 5/6/2016 6:36 PM, Don W7WLL wrote:
>>>
>>> After reading specs that the Amphenol used PTFE
>>  (all of my Amphenol of a later vintage appear to be clear insulation)
>>> Don T
>>
>> Where did you read that Amphenol used PTFE?
>> I have never heard of that.
>> BTW, PTFE is never clear, AFAIK.
>>
>
> PTFE is usually a solid white
>
> a sort of translucent clear is often polyethylene (or high density PE) 
> - low melting point, but no halogens, so burning it is like burning 
> wax, you'll see this in "plenum rated" cables, because it doesn't 
> create a toxic smoke hazard when a building catches fire
>
> Phenolic - a thermoset plastic (e.g. Bakelite, it's been around for 
> over a century) which usually has a filler (wood in the case of 
> Bakelite). I've seen UHF connectors with a phenolic fabric dielectric 
> (you can see the weave), it's probably linen for the fabric, since 
> that's what was used for "precision" components. Circuit board 
> material (XXP, for instance) used paper as the filler.
>
> Diallyl Pthalate is a popular dielectric - it's rugged, but I don't 
> know if it's used much in RF connectors - typically it's blue or 
> green, in connectors like Submini D.  It's also used in high voltage 
> connectors.
>
> Connectors which use phenolic often have an "upgraded" version using 
> Diallyl Pthalate.
>
>
> There's been changes in manufacturing since the UHF connector was 
> introduced pre WW-2
>
> https://www.google.com/patents/US2422982
> https://www.google.com/patents/US2335041
>
>
> Back then, you'd machine stuff and assemble it.
> Now, injection molding and form in place might be more common - it's a 
> LOT cheaper.
> PE is trivially injection molded - Phenolic is "machine and assemble"
> PTFE can be sort of molded: they sinter a powder in a mold, but you 
> can't injection mold it.
>
>
>
>> In any event, PTFE is greatly inferior
>> mechanically, and has no electrical
>> advantage at HF, or even UHF.  It's
>> high temperature rating is also of no
>> consequence for most ham applications.  I
>> don't know why any knowledgeable person
>> would even want it, except in some
>> corner case like a common mode choke
>> made with PTFE coax.
>>
>> Rick N6RK
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-- 

73

Roger (K8RI)


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