Posted by
Robert 'RC' Conley on
Nov 16, 2007; 9:17pm
URL: http://elecraft.85.s1.nabble.com/K2-s-n-4276-Output-Power-Instability-tp366380p366393.html
On Nov 16, 2007 2:03 PM, Dave Van Wallaghen <
[hidden email]> wrote:
> >
> > Nothing bad happens if you leave the balun out, Peter!
> >
> > Sometimes we over-complicate things. A balun is a good example. All that's
> > needed to produce a balanced "feed" is a length of transmission line (1/4
> > wave or so) and a balanced load. If you have those things, it doesn't
> > matter
> > whether the output from the rig is "single ended" or "balanced", the
> > currents at the balanced load, such as the center of a dipole, will be
> > balanced.
> >
>
> I played around with this idea this past summer and fall (at Ron and Don's
> suggestion) of using an open feeder fed directly to my KAT2. I put up a 66'
> doublet about 30' high in some trees in my front yard. I fed it with 33' of
> open line I put together with wooden dowels as spacers. As you might
> imagine, it tuned up just fine on 40m. In fact, I could tune up fine 80m -
> 10m with some problems on 20m and 17m. I then made some open feeder stubs
> for those bands that would bring me to some 1/4 wavelength interval and then
> I could get them to work FB.
-------------------
Dave
What I would like to know is what spacing was used on your open line
feeders 0.5"(300 ohm), 0.75" (450 ohm) or 1.0" (600 ohm)? Did you use
a BNC to dual banana plug connectted directly to the KAT2 on the back
of the K2 or was there a short piece of coax to connect from the KAT2
to the feeders or BNC to a split banana plug.
--------------------
> So thanks, Ron, Don and others on this list. It was a fun (although not very
> scientific) experiment which I plan to do again when the weather warms back
> up in the spring. I'm also playing around with the idea of bringing an open
> wire feeder into my shack as well. I may play around with a balanced tuner
> design as well.
------------------------
The design for this I like to see also.
RC kc5wa
-------------------------
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