>>>>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.
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
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