Just as a comment. PL-259 connectors are all created equal. Some are
great looking connectors and are just pure crap! The plating makes for
good looks but poor performance.
To that end, I always and every time snug my PL-259 connectors with a
pair of 4" Channel Lock pliers. Finger tight is never good enough!
You'd be surprised at the number of RFI issues I've corrected with this
approach.
73
Bob, K4TAX
On 8/7/2017 4:59 PM, David Bunte wrote:
Jim -
I recently sent my K3 to the 'Mother Ship' for some upgrades while my wife
and I took a 3 week road trip. I hooked up the returned rig over the
weekend. Much to my chagrin, I was extremely high SWR. I verified that I
had the RF path correct from the K3 through assorted other devices and to
the antenna. While doing so I noticed one coax connector that was about 1/4
to 1/2 turn loose. I tightened it, and all was fine... for about 30
seconds.
Remembering what a wise man once said I suspected a bad piece of coax. I
checked the same connection again... it was loose... as I tightened it, all
of a sudden it became loose again. This was a 1 foot jumper, from a company
that advertises heavily. I had been using it for several years from the
output of my KPA500 to the sensor for my LP-100A. The threads did not
appear to be stripped, although it felt like it. I looked like the threads
were cur very shallow. I replaced it with a jumper I made many years ago,
using
Amphenol connectors, and all is now working as it should.
Well... not quite all... I have made some nice CW QSOs, but decided to
check SSB operation. It is not working on that mode (which I almost never
use), but I will tackle it to see what is not set correctly.
Dave - K9FN
On Mon, Aug 7, 2017 at 5:28 PM, Jim Brown <[email protected]> wrote:
On 8/6/2017 5:25 PM, David F. Reed wrote:
It was a connection to my coax switch; take it out of line, it goes away.
re-connected, it comes back. Cleaned the connections and reconnected, it
is gone.
Many years ago, a very smart guy said something it the effect that with
any problems with TX or RX, ALWAYS check for bad coax FIRST. From lots of
experience, I've learned the value of that. First things to check are the
SHIELD connections, any junk connectors and adapters (if it doesn't say
Amphenol, it's probably junk).
If you "cleaned the connections" and fixed it, there's a good chance that
the problem is still there, lurking as an intermittent shield connection
that will return. Or maybe the switch is poor.
73, Jim K9YC
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