Topband: KLM antennas on shunt fed towers

[john battin]

There is a problem.  I had a 4 ele 40 and 5 ele 20m klm on a loaded tower. I had a coax balun on the 40 ...... arced through the insulation where it was taped to the boom and the neighbors reported to me there was a fire on my tower. The coax was crisp. 
The 20m beam had a klm balun and it failed .... not so dramatic ... but it failed.  I grounded the DE on both antennas at their center... made no difference to their performance that I could tell... and the problem was gone.  I had to re-tune the tower because of the increased top loading.
 
John K9DX
 

> Date: Tue, 25 Dec 2012 22:52:43 -0500
> From: ron.e.spencer at gmail.com
> To: topband at contesting.com
> Subject: Topband: KLM antennas on shunt fed towers
> 
> Anyone have problems running a KLM antenna with the 4:! balun and 
> elements insulated from the boom (stock KLM config) on a shunt fed tower 
> for 160? I ask because I have a 6 element 10 on the top of my shunt fed 
> tower and now, after running a kw on 160, the antenna's swr has gone 
> over 2:1 where before it was pretty flat at about 1.2:1 or so. Any ideas?
> 
> Thanks
> Ron N4XD
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