Ditto Frank I work in the communications industry and he BNC ODDITY BUG has bitten my butt more than once!!
Ronnie W5SUM Sent from my iPhone > On Feb 21, 2018, at 3:14 PM, donov...@starpower.net wrote: > > If only Dale's comment were true... > > > As far as I know all 75 ohm BNC connectors made in the USA use > the correct diameter center pin. > > > However... > > > This is NOT true for many import connectors and adapters, even > modern high bandwidth 75 ohm import connectors often have serious > design and quality control problems. I've found three categories of > serious reliability problems with import 75 ohm BNC connectors > and adapters. > > > - much smaller center pin diameter, they're copies of 40 year old > obsolete "made in USA" 75 ohm BNC connectors > > > - center pin slightly too small in diameter -- a quality control or > manufacturing problem that causes unreliable connections. > > > - tapered center pin with incorrect diameter over most of its length > that causes unreliable connections > > > Don't believe me? I have modern import connectors with all three > types of problems. > > > 73 > Frank > W3LPL > > > > > > ----- Original Message ----- > > From: "Chris Cox, N0UK" <chr...@chris.org> > To: "Dale Parfitt" <pari...@frontier.com> > Cc: "Chris Cox, N0UK" <ygsoftroc...@chris.org>, k...@yahoogroups.com, > elecraft@mailman.qth.net > Sent: Wednesday, February 21, 2018 4:25:15 PM > Subject: Re: [Elecraft] [KX3] BNC connector oddity on KX3 > > Indeed - i didn't know that. Thanks for the info, Dale. > > SO, if you have an OLD 75 Ohm BNC plug... :-) > -- > 73 Chris Cox, N0UK, G4JEC > chr...@chris.org > >> On Mon, 19 Feb 2018, Dale Parfitt wrote: >> >> The center pin on 50 Ohm and 75 Ohm BNC’s has been identical for perhaps 20 >> years. The 75 Ohm impedance is now attained through modification of the >> connector’s dielectric structure. >> >> >> >> Regards, >> >> >> >> Dale W4OP >> >> >> >> From: k...@yahoogroups.com [mailto:k...@yahoogroups.com] On Behalf Of 'Chris >> Cox, N0UK' ygsoftroc...@chris.org [KX3] >> Sent: Monday, February 19, 2018 12:29 PM >> To: rich hurd WC3T >> Cc: k...@yahoogroups.com; elecraft@mailman.qth.net >> Subject: Re: [KX3] BNC connector oddity on KX3 >> >> >> >> >> >> Not saying this IS the problem but i fth emale BNC plug is a 75 ohm >> connector, its centre pin will be a narrower diameter and may only be >> making intermittent contact with the female socket on the KX3. >> >> -- >> 73 Chris Cox, N0UK, G4JEC >> chr...@chris.org >> >>> On Mon, 19 Feb 2018, rich hurd WC3T r...@wc3t.us [KX3] wrote: >>> >>> Hi, >>> >>> I had an oddity with hooking an antenna to the BNC connector on my KX3 >> that >>> happened enough times to be chalked up to something other than random >>> chance. Looking for opinions on whether my solution aligned to your >>> experience(s). >>> >>> I have a complete station - a KX3, a PX3, and a KXPA100. The KXPA100 is >>> connected via a Cables On Demand connector with a PL259 on one end and a >>> BNC connector on the other end. All other interface cables are Elecraft >>> standard. >>> >>> This is NOT the first BNC connector that I've used. Prior to this last >>> acquisition I had a couple of other BNC to PL259 jumpers that I was using, >>> and the usual smattering of connectors and adapters in the junque box. >>> >>> No matter which one I used, If I removed the BNC connector from the rig >>> (maybe to go portable, for example, or the last time it was because I >>> installed Eneloop Pro batteries to the internal battery holders) I would >>> put everything back together, and then would have severe - almost >>> debilitating - signal attenuation when I got the rig fired up. If I >>> twisted and spun the BNC connector on the jack, it would improve, and then >>> get bad again more often than not. It could take up to 20 minutes to get >>> everything "dialed in" so that the signal was appearing again. God help me >>> if I accidentally moved something after that. And of course, while all >>> this was happening the ATU was having fits, with 99:1 SWR readings and the >>> amp was going offline; all kinds of weirdnesses. After things calmed >>> down. the ATU behaved itself, the amp stopped being pouty, and all was >> then >>> good. >>> >>> Thankfully, now that I have the Cables On Demand product, things seem to >>> have quieted down - although I still don't disconnect without provocation. >>> :) Though I'm desperately afraid of when I start to go mobile after the >>> snow melts and the weather gets nice again. :) Hope I can get my IC706 >>> fixed and back in service as my base station before that occurs. >>> >>> My question was going to be in desperation more than anything else if this >>> last cable didn't work, but thankfully, that's been the only cable vendor >>> that I trust for any of my specialized cables and they haven't failed me >>> even with this one. >>> >>> Are BNC connectors that finicky? Is it possible that I just had a bad >>> batch of low quality jumpers? I'm just wondering if anyone else has had >>> excessive fiddling with their BNC connections. >>> >>> --- >>> 72, >>> Rich Hurd / WC3T / DMR: 3142737 >>> PA Army MARS, Northampton County RACES, EPA-ARRL Public Information >> Officer >>> for Scouting >>> Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) >> Grid: >>> *FN20is* >>> >> >> __._,_.___ >> >> >> Reply via web post >> >> • >> >> <mailto:?subject=> Reply to sender >> >> • >> >> <mailto:k...@yahoogroups.com?subject=> Reply to group >> >> • >> >> Start a New Topic >> >> • >> >> Messages in this topic () >> >> _____ >> >> >> <https://s.yimg.com/ru/static/images/yg/img/megaphone/1464031581_phpFA8bON> >> >> <https://yho.com/1wwmgg> Have you tried the highest rated email app? >> >> With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app >> on the market. What are you waiting for? Now you can access all your inboxes >> (Gmail, Outlook, AOL and more) in one place. Never delete an email again >> with 1000GB of free cloud storage. >> >> _____ >> >> Visit Your Group >> >> Yahoo! Groups >> <http://l.yimg.com/ru/static/images/yg/img/email/new_logo/logo-groups-137x15 >> .png> >> >> • <https://info.yahoo.com/privacy/us/yahoo/groups/details.html> Privacy • >> <mailto:kx3-unsubscr...@yahoogroups.com?subject=Unsubscribe> Unsubscribe • >> <https://info.yahoo.com/legal/us/yahoo/utos/terms/> Terms of Use >> >> >> >> >> >> . >> >> >> >> <http://y.analytics.yahoo.com/fpc.pl?ywarid=515FB27823A7407E&a=1000131032227 >> 9&js=no&resp=img&cf12=CP> >> >> __,_._,___ >> >> > ______________________________________________________________ > 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 w5...@comcast.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
