[Elecraft] KPA 500

[Michael Walker]

This is going to cause a big sh*t storm :) and about 900 emails before
Wayne shuts it down.

However, having been in RF for a bit less then most of you (only 1974), I
have had connectors fail and not fail in my HF world (60Mhz or less).

No Name ones have worked wonderfully for decades.  Amphenol's have failed
in a year.   Amphenol T's in a phasing harness seem to fail the most (fell
apart).  But, then, who knows who makes them.

What I can say is that there is, based on my personal experience, no 100%
guarantee on any particular one.

Install it.  Visually inspect it.  Make sure it is clean, dry and
waterproof and a year from now, if it is outside, open it up and make sure
it is still dry.

It isn't eve 'you get what you pay for' any more.

Next, we can have another 200 emails on how to solder a PL259.  :)

Mike va3mw




On Fri, Apr 10, 2020 at 4:37 PM Ed Pflueger <ab4iq at comcast.net> wrote:

> Well I was told by an unreliable source that the military had to have their
> Amphenol's manufactured in the USA but were sent to Mexico for packaging.
> Whether that's true or not I cannot confirm.  All I know is the ones I buy
> are stamped in black lettering saying "Amphenol 83-1sp and below that  is
> 74868 PL259 49190" and they can run around 4 bucks apiece depending on when
> and where I get them.
>
> Ed... AB4IQ
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Brown
> Sent: Friday, April 10, 2020 11:27 AM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KPA 500
>
> On 4/10/2020 8:45 AM, Irwin Darack wrote:
> > In my experience, coax connectors, barrel connectors, etc. are always
> > fail points when there is a sudden increase in SWR as power is
> > increased. They oxidize over time and sometimes just reconnecting or
> > replacing is the first step before taking the amp apart.
>
> If this is happening, I'd suspect 1) the connectors have gotten wet or
> 2) the are JUNK connectors. If they aren't labeled "Amphenol," they're
> JUNK.
>
> 73, Jim K9YC
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