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July 13th 06, 03:58 PM posted to rec.radio.amateur.antenna

Tom Ring

Tom Ring is offline

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Antenna optimization

wrote:

Tom Ring wrote:

And YO could beat K1FO by only hudredths of a dB. If he'd had more CPU
power to do more runs per day...
snip

The other thing I must give Brian credit for is his excellent command
of English. I have *never* seen a spelling or grammatical error in any
of his documentation, which is very unusual these days.

73, Bill W4ZV

Oh, I give Brian lots of credit. He did a fantastic job. And there
were times his developments happened at a blistering pace.

I've had more than a little experience with YO and AO. I was an alpha
tester for him. I once ran an optimization for 3 weeks straight in AO.
Unfortunately it was a dead end design idea for an odd dual band
yagi. I digress.

When I said you could only get hundredths of a dB, I meant it. I did
hundreds of models and thousands of runs trying. You are probably not
optimizing to the specs that an EME'r would desire. Setting the
tradeoffs in YO to get the balance right is touchy, and changes as boom
length increases. You also need to partially or completely turn off
optimization on a few elements for it to do its best job on a long yagi.

The K1FO yagi designs are still the best around in my opinion. For one
reason above the fact that they have great specs - they are a very high
performance design that is easy to reproduce. And when in an array they
do not detune as much as "better" designs.

tom
K0TAR

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