Yeah, I've seen that, I was hoping for an exact number with a tolerance.
Sigh. But thank you! I'm sure, out there SOMEWHERE is the exact spec for
"What is a SO/PL 259, as the military uses/used them"
I'm actually crazy enough to BUY spec sheets (I actually ended the debate on
Wikipedia on 'what is a 1/4 tripod socket - `1/4-20 or 1/4 Whitworth' -
answer, neither, closer to a lose 1/4-20, but the ISO changes it slightly so
it can fit either - I was making some stuff for cameras in my shop for other
people, and wanted it RIGHT)
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Joe Subich,
W4TV
Sent: Tuesday, June 18, 2024 11:05 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] How lossy are PL-259s at HF?
Amphenol Datasheet:
<https://datasheet.octopart.com/SO-239-Amphenol-RF-datasheet-11898728.pdf>
Unfortunately, I do not see dimension specifications for the contacts ...
only the body, threads and *internal* dimension of the pin.
Wikipedia <https://en.wikipedia.org/wiki/UHF_connector>
gives the center pin of the PL-259 as "approximately 0.156 inch (4mm)
diameter".
73,
... Joe, W4TV
On 6/18/2024 10:17 AM, charlie@thegallos.com wrote:
>
> Rob,
> Totally agreed, and what eventually failed on that barrel connector
> (disclaimer, it was probably 5-10 years old)
>
> Now here is a good technical question - WHAT is the spec for min/max
> diameter of the cup? Rather than drag connectors (which is a good
> rough
> way) - I can drag a set of pin gages in a go/no go handle. I was just
> wondering if you (or anyone on thread) knows?
>
> 73 de KG2V
>
> Charlie
>
>
> -----Original Message-----
> From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Rob
> Atkinson
> Sent: Tuesday, June 18, 2024 9:16 AM
> To: towertalk <towertalk@contesting.com>
> Subject: Re: [TowerTalk] How lossy are PL-259s at HF?
>
> I'd say when it comes to loss with UHF connectors the most critical
> thing is the machining of the male pin and the female cup fingers.
> Amphenol females are made so that you feel some resistance when you
> plug the UHF male into the jack. That grip on the center pin is
> important. Poorly made jacks that don't make good pin contact are
> where you have resistance and loss, so much so that in cases of 1 KW
> continuous duty, the jack burns up after several minutes. A good jack
> will hold a PL259 body by the pin hanging down with the threaded
> collar loose. If the PL259 falls out, something is wrong, either the
> male pin isn't the right size or the jack isn't holding it tight enough.
>
> When shopping for UHF connectors at a hamfest, bring an Amphenol male
> and use it to test any connectors that have a UHF female involved. Do
> not be enticed by pretty looking jacks that are silver plated with
> what appear to be teflon dielectric and gold plated pin cups. In my
> experience these off-shore jacks may fail to hold the male vertically
> and will heat up if used.
>
> 73
> Rob
> K5UJ
>
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