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[AMPS] coax connector ratings

To: <>
Subject: [AMPS] coax connector ratings
From: (2)
Date: Sat, 29 Sep 2001 06:17:18 -0700
>2 wrote:
>>>2 Wrote:
>>>>Type-C connectors have more current carrying ability and more voltage 
>>>>withstanding ability than Type-N. Type-C are moisture proof, and bayonet 
>>>While that is true, they suffer from the same problem as BNC, in that
>>>the bayonet locking force comes from compressing a rubber gasket, which
>>>eventually softens and loosens the connector. 
>>//  Silicone rubber is virtually non compressive. 
>I used to use several C connectors which had come from testgear at a
>local research facility. After several years of sitting in a rack, the
>gaskets had compressed and you could spin the plugs quite freely in the
>sockets...  exactly like an old BNC.
//  I have seen such BNC connectors.  Amphenol® and Kings® mil-spec 
Type-C connectors have a non-compressible red silicone rubber gasket.  
Mil-spec BNC connectors use the same gasket material.  

>The problem with all bayonet-type mechanisms is that they cannot apply
>maximum compression to the spring or gasket when locked - if they did,
>you wouldn't be able to operate the twist-lock.
//  I have never seen an intermittent C connector.  

>>>A better solution might
>>>have been type SC ("Screw C") or LC but these always seem to have been
>>//  Screws can loosen.
>But you have control over that, unlike the ageing of a gasket.
//  Choosing a non-compressive gasket material seems preferable.  
Tightening a screw-on connector does not tighten the gasket seal around 
the coax - nor does it change contact pressure in either the center 
conductor or the shield.  
cheers, Ian

-  R. L. Measures, 805.386.3734, AG6K,  

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