Peter The larger concern is that most of us have no way of being able to tell the difference from a 50 ohm bnc to a 75 ohm bnc. We buy these online and at flee markets, which is part of the reality.
Is there an easy way to tell them apart? I assume the same is also true for N connectors which are essentially a BNC but with a different casing. Mike va3mw On Mon, Oct 13, 2014 at 12:30 PM, Peter Torry <peter.to...@talktalk.net> wrote: > Jim, > > It may not make a difference to performance on HF but it does matter > because the centre pins have different diameters of solder pot / crimp > barrel to match the cable impedance used. Also incorrectly mated > connectors risk damage to their centre connectors by forcing the > engagement. Use the correct connector for the cable in use. > > 73 > > Peter > > G3SMT > > > > On 13/10/2014 16:15, Jim Brown wrote: > >> On Sun,10/12/2014 6:32 PM, Acbross via Elecraft wrote: >> >>> Don't know where anyone got the idea that BNCs made for RG-8x we 75 ohm. >>> I worked in the tv industry for many years and we used hundreds of BNCs >>> that were made specifically for 75 ohm video. By the way, RG-59 not RG-79. >>> >> >> While you are entirely correct that there are 75 ohm and 50 ohm BNCs, the >> difference DOES NOT MATTER at HF, because the connector is such a small >> fraction of a wavelength and the difference is small. 75 ohm connectors >> were important with analog video because of the smearing of very fine >> detail in a high res image, and because studios do lots of patching and >> routing. >> >> 73, Jim K9YC >> ______________________________________________________________ >> 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 peter.to...@talktalk.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 va...@portcredit.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
