Topband: KLM antennas on shunt fed towers

[Grant Saviers]

A little different version of this question - is there any general 
guidance about what to do with pickup on other antennas when 
transmitting?  Shunt the pickup to a dummy load?  short?  open? 
something else?

I'm adding a vertically polarized pair of phased 80m delta loops (ON4UN 
design) on one tower with a 40m Moxon and a 80m rotary dipole above 
their apex.

Grant  KZ1W


On 12/26/2012 9:33 AM, john battin wrote:
> 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
>> _______________________________________________
>> Stew Perry Topband Distance Challenge coming on December 29th.
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> _______________________________________________
> Stew Perry Topband Distance Challenge coming on December 29th.
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