Re: [Elecraft] BNC connector oddity on KX3

The denouement to the story: I wrote to Elecraft and purchased P/N E850552, the KX3 Antenna Connector Assembly w/LPF. It arrived today. After the cub scout meeting tonight (my son went from Webelos to the local scout pack in the crossover ceremony tonight) I spent the last 20 minutes (and two

Re: [Elecraft] BNC connector oddity on KX3

Thanks Don; I remember that we went over this earlier in the thread. Highly unlikely that I had legacy stuff as I became a ham in 2015 and acquired most of my stuff new. I am inclined to think that it was more possibly an out of spec 50 ohm connector or a manufacturing defect. I've already

Re: [Elecraft] BNC connector oddity on KX3

Rich, Since you have traced the problem to the contact between the female BNC and the male (yes your twisting and applying pressure confirms that is the problem). It is entirely possible that if you had some old cables made with old 75 ohm BNC male connectors, that they could have enlarged

Re: [Elecraft] BNC connector oddity on KX3

Unfortunately there are some really crappy (cheap) BNC connectors out there, some with too large centre pins. Using one of those even once may be enought to damage the female side :-( So when you get a new female for your KX3, have a look at all your cables and adapters and make sure all of

Re: [Elecraft] BNC connector oddity on KX3

I've pretty much exhausted most of the permutations of my cables and connectors. The only persistent behavior is that if I apply slight pressure to the side of the BNC connector where it plugs into the jack on the KX3, or sometimes if I twist it and then apply slight pressure just so, I see a

Re: [Elecraft] BNC connector oddity on KX3

I use many BNC connectors, some at KW level, and nearly all of them are good. But occasionally some do not make a good contact and need to be thrown away ASAP. The best way to check is to try another cable. Recently I bought a large number of cheap RG-58 cables with BNC connectors from

Re: [Elecraft] BNC connector oddity on KX3

That's one thing I was able to check; connector is tightened securely on the shell of the KX3. Thanks. On Thu, Mar 8, 2018 at 3:44 PM, Don Wilhelm wrote: > Rich, > > If the BNC connector rotates even a wee bit, that is the problem - tighten > the BNC jack. A good

Re: [Elecraft] BNC connector oddity on KX3

Rich, If the BNC connector rotates even a wee bit, that is the problem - tighten the BNC jack. A good connection to the jack shell is required. "Opening it up" is not a big deal - unless you have the 2 meter option - just remove the bottom cover, no more complicated than changing batteries.

Re: [Elecraft] BNC connector oddity on KX3

I have three more days of checking various configurations including binding post antennas, end fed half waves, opening the damn thing up... Thanks all for the suggestions. On Thu, Mar 8, 2018 at 2:50 PM, Walter Underwood wrote: > Open it up and make sure that the

Re: [Elecraft] BNC connector oddity on KX3

Open it up and make sure that the antenna connector is securely connected to the ATU board. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Mar 8, 2018, at 11:46 AM, GRANT YOUNGMAN wrote: > > So was the antenna and related

Re: [Elecraft] BNC connector oddity on KX3

So was the antenna and related cabling/connectors good as verified by your analyzer at the point of the radio connection? In some 60 years of doing this, I have yet to find the radio to be the problem when it tells me it’s looking into high SWR. There’s a first time for everything, course :-)

Re: [Elecraft] BNC connector oddity on KX3

Okay, so I took the plunge and disconnected the KX3 to take with me on vacation. Hooking it back up proved to be a tad problematic - SWRs of 25:1 and no signals from any bands, anywhere. I'm now working through what options I have, starting with checking female connector deformation and doing

Re: [Elecraft] BNC connector oddity on KX3

Hi Rich, Your problem is almost certainly caused by using obsolete 75 ohm BNC male connectors on your coaxial cables. During the 1960s, the easiest way to manufacture 75 ohm BNC connectors was to significantly reduce the center pin diameter from the 0.053 +/- 0.001 inch diameter specified

Re: [Elecraft] BNC connector oddity on KX3

Sometimes the center pin of the male BNC will get pushed back into the Teflon insulator. Run your thumb nail over the end of the connector. Your nail should touch the end of the pin. 73's Dick KN6AA On Feb 19, 2018 08:55, "rich hurd WC3T" wrote: > Hi, > > I had an oddity with