[Elecraft] [KX3] BNC connector oddity on KX3

[Mel Farrer]

Hi all, 
I have found that over the years the female BNC has a fatigue problem.  That is, the fingers of the either 2 way or 4 way mating receptical relax and spread apart.  Takes a keen eye to see it, but it does happen. Most of the mating recepticals can be reshaped to the original tight fit, some of the imports are not that good.  When I find them now I replace them.
Mel, K6KBE

      From: "'Dale Parfitt' parinc1 at frontier.com [KX3]" <KX3-noreply at yahoogroups.com>
 To: "'Chris Cox, N0UK'" <ygsoftrock40 at chris.org>; 'rich hurd WC3T' <rich at wc3t.us> 
Cc: kx3 at yahoogroups.com; elecraft at mailman.qth.net
 Sent: Monday, February 19, 2018 11:59 AM
 Subject: RE: [KX3] BNC connector oddity on KX3
   
    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: KX3 at yahoogroups.com [mailto:KX3 at yahoogroups.com] On Behalf Of 'Chris Cox, N0UK' ygsoftrock40 at chris.org [KX3]
Sent: Monday, February 19, 2018 12:29 PM
To: rich hurd WC3T
Cc: kx3 at yahoogroups.com; elecraft at 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
chrisc at chris.org

On Mon, 19 Feb 2018, rich hurd WC3T rich at 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*
>  __._,_.___     Posted by: "Dale Parfitt" <parinc1 at frontier.com>     
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