Re: [HCDX] K9AY = Super Antenna?

["George Maroti" <curious.george@xxxxxxx>]

In general, the K9AY loop does need the direct connection to ground. 
However, some have experimented with disconnecting it, and at times it
gives better performance.

As far as "good" ground goes, if you look at Figures 7 & 8 in the
original QST article:

http://www.arrl.org/tis/info/pdf/9709043.pdf

the plots show that the F/B actually is better over "poor" ground
compared to "very good" ground!  The F/B ratio of this antenna is
nowhere near as good as a pennant or flag.  And as you stated, the flag
and pennant are much less dependent on the surrounding ground.

The strength of the K9AY in my opinion lies in the ease with which you
can change directions, and if you have a Vactrol (in place of the
terminating resistor), the ease with which you can optimize your nulls.

I invite any HCDX readers interested in the K9AY loop to join a
separate discussion list on this antenna at:

http://www.egroups.com/group/K9AYloop


73's

George



----------
From: Roland.Burkhard@xxxxxxxx
To: hard-core-dx@xxxxxxxxxxxxxxxx
Subject: [HCDX] K9AY = Super Antenna?
Date: Wednesday, July 26, 2000 5:03 AM

Hi Alf and all the others!

I tested a temporarily home brew K9AY-antenna and compared ists
behaviour with and without ground.
Result is, that the antenna doesnt work anymore without ground.
It loses the f/b directivity.

It needs   g o o d    ground (Just like the EWE).

This has been proved and documented and lead to the development of the
pennant antenna, which is better in this regard.
Pennant and flag antennas are ground free antennas. I can recommend
these despite of their larger dimensions.
They are easy to home brew.

Description of the pennant antenna: In English see QST 7/2000, in
German see funk 7/2000. Or here
http://www.angelfire.com/md/k3ky/page37.html

Roland HB9BQR

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