Put the balun outside and bring the coax into the shack.
I am feeding a large NVIS loop with my K3. The loop is fed with 450
ohm window line which connects to a 4:1 balun under the eve of the
roof before it enters the shack. The K3 is connected to the balun
with 50 ohm coax. My K3 tuner will
I'd love to see a K3 built-in ATU with balanced outputs to feed ladder
line. Has this been considered and dismissed, or is it a possibility for a
future option?
I'm guessing this might be a problem for the already crowded rear panel,
but could it be provided as a plug-in board (like the KANT3 or
Andrew,
A bit of 'trivia' first:
That was supposed to be a solution in the KAT500 tuner. The initial
design put the balun on the input of the tuner, and attempted to float
the rest of the tuner while trying to maintain balance.
There were problems with maintaining balance through the rest of
Great; thank you for the trivia, very helpful. I figured it had already
been considered and that there was a good reason for the current
configuration.
The BL2 following the KAT3 was exactly one option I was considering. I've
read about several cases in which ops had success, but read others in
There may be no difference in efficiency between putting the balun at the input
or the output of the tuner if you are operating into a nice 50ohm resistive
dummy load, but the situation changes if you are operating into an antenna fed
with ladder line on which there is a high SWR. In this case,
Andrew,
The BL2 on the output of the tuner may not be the total answer. The
conditions and situations are too numerous to address. I would suggest
some study into antennas and transmission lines before assuming that
anything will work - because it is not true that anything will work.
The one
Hi Andrew, Don all,
I have a K3 (4520) and have recently installed a new antenna in the form
of a V beam with the bisector at about 7 Degrees east of North, with
the included angle at about 70 degrees and a leg length of 285Ft, height
above ground is 70 to 75 Ft, with ground sloping down away
On 9/29/2012 10:04 AM, Eric Buggee wrote: Addendum to my original post.
Hi Andrew, Don all,
I have a K3 (4520) and have recently installed a new antenna in the
form of a V beam with the bisector at about 7 Degrees east of North,
with the included angle at about 70 degrees and a leg length
Eric,
A V beam will be quite directional (bidirectional) and the response
depends on frequency. especially at those frequencies where the length
is in excess of 1 wavelength.
You must have found a good length if it operates well with the BL2 and
the KAT3 combination.
The wire angle of 70
* On 2012 28 Sep 18:07 -0500, Andrew Moore wrote:
I think I will try this approach and enjoy the experimenting.
Hi Andrew.
For learning the theory on a lot of this stuff, a good reference on the
topic is Reflections III by Walt Maxwell, W2DU (SK), published by CQ
Communications. Walt did a
Maybe not. The analysis presented in this article:
http://fermi.la.asu.edu/w9cf/articles/balun/
leads to the conclusion that locating the choke balun at the input of
the tuner, and floating the tuner, offers an advantage only for
balanced tuner designs (and good balance in the load). The stress
Hi Don all,
Yes the reason for the length of 285 Ft is based
on reading Cebick's musings in antennix on long wire anenna's / V beams
on to Rhombic antenna's, where Cebick notes that odd multiples of 1/4
wavelength produce slightly more gain than multiples of 1/2
Bob,
My analysis - while floating the unbalanced tuner may be possible in
theory, in practice, it is not practical. There are always be points
that will be found to upset the balance.
There is a reason for creating balanced networks, and putting the balun
on the input of an unbalanced
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