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*
> >
>
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