Re: Topband: KLM antennas on shunt fed towers

[Grant Saviers <grants2@pacbell.net>]

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@gmail.com
> > To: topband@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.
>                                         
> _______________________________________________
> Stew Perry Topband Distance Challenge coming on December 29th.
_______________________________________________
Stew Perry Topband Distance Challenge coming on December 29th.