[1000mp] high swr between rig and amp

[Brian Smithson]

I had similar symptoms without an amp at all. I have a 'quick disconnect'
from my antennas that I yank everytime I leave the shack. It is a PL-259
without threads so it can slide onto the SO-239 of a bandpass filter I have.
I found my SWR problem went away when I wiggled this connection. Time for a
new one!

-Brian n8wrl

-----Original Message-----
From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
On Behalf Of k5uj at mc.net
Sent: Monday, February 07, 2005 9:20 AM
To: 1000mp at mailman.qth.net
Subject: RE: [1000mp] high swr between rig and amp


I have tried this.  the problem is that you wind up chasing a moving target.
the trouble may go away, on the original problem band, and reappear
elsewhere becuase the fix length that's okay for the original problem is now
the wrong length on another band.    

however that kind of problem is usually shown by a slightly high swr, like
1.5 to one; not this problem.  Remember that in the original post, he said
he had full scale swr meter deflection.  that sounds more like an open
somewhere in the rf path.

rob/k5uj 


-----Original Message-----
From: w9ol at billnjudy.com
To: k5uj at mc.net
Sent: Feb  6, 2005  2:08 PM 
Subject: [1000mp] high swr between rig and amp

I've had this problem myself especially with the WARC bands. Even on amps
that had tuned inputs.

I used an old trick I was taught by my Elmer.
Just add in a random amount of coax to the piece between the rig and amp.

You will 'probably' see a difference and may have to try a couple pieces.

I'm not sure of the exact theory of why this works...but then I'm still
wondering why 
people at the south pole don't fall off into space.



-----------------------------------------------------
Jack Kevorkian for White House Physician.
-----------------------------------------------------

Bill H. in Chicagoland


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