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Re: [TowerTalk] SWR Problem Balun or lightning protection?

To: Tony <>
Subject: Re: [TowerTalk] SWR Problem Balun or lightning protection?
From: Joseph or Ruth Patrick <>
Date: Wed, 21 Dec 2011 05:48:30 -0800 (PST)
List-post: <">>
Good Morning Tony

 It seems as if you have eliminated the lightning protection. I would ask if 
can easily reach the balun? You may have to. Put a known good 100 watt dummy 
load at the connection from the coax to the balun. If you come up good here 
chances are it's the balun or further down the line. If you still get high swr 
with this check then it's the coax or connections. I had a 75' run of coax go 
bad and this was the best way I know of to check it. Others may have better 
suggestions. Good Luck let us know how you make out. Merry Christmas to all.
 73 DE K4XZ Joe Patrick
God Made Man
Sam Colt Made Them Equal 



I bypassed the lghtning protection and the SWR problem is still there. I 
installed a new coax connector on the shack side of the coax as well.

I still have to check the balun, balun leads and the coax-to-balun 
connector. There's nothing else inline. The coax (Bury Flex) and balun 
(3KW M2) were installed a few years ago.

I just checked the system again with two different 100 watt rigs and 
found that:

- I can transmit for 2 or 3 minutes from a cold start before the SWR 
starts to rise
- the SRW returns to normal 30 seconds after I stop transmitting
- it takes a lot less time for the SWR to rise after the 30 second rest 

I did replace the ground wires with copper strap a few months ago, but I 
haven't made any other changes to the tower and antenna system.

Why do these things always happen during the winter ;  )

Tony, K2MO


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