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" <b...@wjschmidt.com> To: "Elecraft Reflector" <elecraft@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. --- This email has been checked for viruses by AVG. https://www.avg.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donov...@starpower.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
