Topband: KLM antennas on shunt fed towers

[Peter Voelpel]

Yes, I am quite happy with those home brew baluns, but there is a caveat
with them.
All the antennas are far too high in frequency and the tips are not long
enough to get the adjustment down into the middle of the band.
However, since SWR is not exceeding 2 across the band and the patterns are
nice I can live with it.

73
Peter, DJ7WW


 

-----Original Message-----
From: Charlie Cunningham [mailto:charlie-cunningham at nc.rr.com] 
Sent: Mittwoch, 26. Dezember 2012 16:05
To: 'Peter Voelpel'; topband at contesting.com
Subject: RE: Topband: KLM antennas on shunt fed towers

Good afternoon, Peter!

Well, your comments  make  me even more suspicious that Ron's KLM balun has
been damaged by common mode current, induced in his 10m coax by 160m tower
current. Your 1/2 wave baluns, made of 1/2" Cellflex, should be much more
capable of withstanding the common mode currents. A good solution and
preventive measure, I think. Have a good day!

Charlie,. K4OTV

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Peter
Voelpel
Sent: Wednesday, December 26, 2012 7:14 AM
To: topband at contesting.com
Subject: Re: Topband: KLM antennas on shunt fed towers

I feed my tower at a height of 21m against one radial and have KLM yagis
mounted at 25, 31 and 44m (top of tower).
So far I never had a problem by running high power on 160m and no change in
SWR on the KLM antennas.
However, I don´t use the original baluns but home made half wave 1:4 Baluns
made from 1/2" Cellflex.

73
Peter, DJ7WW

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Ron
Spencer

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.