[Elecraft] loss of RX sensitivity

[donovanf at starpower.net]

Captivated pin N connectors completely resolve the problem of the 
center pin pulling back in cold weather. 


73 
Frank 
W3LPL 


----- Original Message -----

From: "Dr. William J. Schmidt" <bill at wjschmidt.com> 
To: "Elecraft Reflector" <elecraft at mailman.qth.net> 
Sent: Tuesday, September 18, 2018 3:29:41 PM 
Subject: Re: [Elecraft] loss of RX sensitivity 


[[The next time someone challenges me on why I only use BNC and Type N connectors, I’m going to send them this entire discussion.]] 

Unfortunately this is not perfect either. If you use an "N" connector on long runs of heliax in a cold climate, you must be aware that the coefficients of expansion of the center conductor and the shield can be different... and on several occasions, I have seen the center pin pull back from the connector (and essentially disconnect) because the center conductor contracted more than the shield. Nb. This does not happen with all "N" connectors. This is less of a problem with BNC connectors because the coax used is generally has a somewhat flexible shield. 




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