"Tom Ring" wrote in message
...
Dave VanHorn wrote:

"Tom Ring" wrote in message
...

You have too much time on


Random text generator?

You needed to read the whole post. It was a joke about the joke that is
the thread.

The thread isn't a joke.
It's a serious question.

Dave VanHorn wrote:
What sort of antenna offers narrow beamwidth, combined with smooth
sidelobes?
I'm not too concerned with F/B ratio, or the magnitude of the sidelobes,
(smaller is better obviously) but I'm more concerned that they not be a mess
of deep spiky notches.

An Extended Double Zepp has a relatively narrow beamwidth
(~35 deg) and four side lobes about -13 dB down. I vaguely
remember a magazine article that told how to virtually
eliminate the EDZ side lobes.
--
73, Cecil http://www.qsl.net/w5dxp

An Extended Double Zepp has a relatively narrow beamwidth
(~35 deg) and four side lobes about -13 dB down. I vaguely
remember a magazine article that told how to virtually
eliminate the EDZ side lobes.

It was in the vol. 4 Compendium, and it is also in my latest ARRL antenna
book. The technique involves placing about 2500 ohms capacitive reactance on
each leg of EDZ at a strategic location. You can reduce the side lobes, and
provide a better match to 50 ohm coax.
I have been playing around with a 3 element 2 meter EDZ beam that is
currently 17 dbi gain @ 3 deg. elevation with 12 dbi F/B. I used side lobe
reduction on all 3 elements. Be interesting to see if the actual antenna
matches the model.
73 Gary N4AST