Posted by
Gwen Patton on
Oct 11, 2019; 11:07am
URL: http://elecraft.85.s1.nabble.com/KX2-Antenna-Curiosity-tp7655612p7655653.html
I have a KX3 instead of a KX2, but I frequently go out in the field to play
radio at local parks and other scenic spots. I have a number of antennas,
but one of my favorites is one I built recently, a link dipole for 40, 30,
and 20. It's tuned for the CW portions of the bands, so it doesn't need
much tuning, but if I want to work phone I hit the internal tuner just to
tweak it a little bit. I suspend it on top of a 20-foot telescopic
fiberglass pole from SOTABeams, secured in a drive-on mount and held down
by one of the tires of my E-150 conversion van. I run it in inverted-V
configuration, using stakes or photographers' sandbags at the far ends if
the location doesn't like stakes.
I didn't bother with baluns or anything. I just wired the coax to the
midpoint and trimmed it up that way using an analyzer. I get good results
with it on CW or phone, easily going from the Philadelphia suburbs to the
Michigan Upper Penninsula on 40m phone with 10 watts. If I find that I'm
getting stray RF, I have a big isolator choke I can run the line through
that clobbers it nicely.
73,
Gwen, NG3P
On Fri, Oct 11, 2019 at 6:55 AM CUTTER DAVID via Elecraft <
[hidden email]> wrote:
> I'd like to suggest that one very good reason for using centre-fed and
> external matching unit is because the harmonic pickup from nearby stations
> is much reduced compared to multi-band antennas. This is best implemented
> when the antenna is as near perfectly balanced as possible to avoid
> feedline pickup. A *proper* choke to cancel out-of-balance currents should
> be helpful in this regard.
>
> For single station field days, I've used the Spiderbeam 807 off-centre-fed
> inverted V dipole on a f/g pole which is a fast way to get on air without
> an external matching unit to fiddle with. Common mode current is virtually
> zero. It's a great solution for beginners reducing the fiddle factor, ie
> plug and play KISS. Less to carry out into the field as well.
>
> David G3UNA/G6CP
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