RadioBanter - View Single Post - SUPER J-POLE BEATS YAGI BY 1 dB

February 7th 05, 10:30 PM

On 7 Feb 2005 13:57:18 -0800, wrote:

Richard Clark wrote:

It takes no great effort to duplicate your rather sloppy presentation
to offer many better, smaller designs that eclipse your speculated
results. Through selective disclosure, choosing a weak competitor,
leaning on abused references, and one thumb on the scale, anyone can
inflate performance claims to satisfy a customer (or attract more).

I challenge anyone else to use
whatever Yagi Optimizers they have
to come up with a 3 element design
(to keep the size down) with a 180 degree
front lobe, and with an 11dB F/B ratio,
that has a greater than 4.5 dBi in the
front lobe. Plot the H-plane of your
simulation too.

This is a hollow challenge in that such designs are already freely
available through EZNEC. Again, the thumb on the scale scenario
offers easy ways to pencil whip these numbers above, given they are
only partial disclosures tricked up for the benefit of marketing to
suckers otherwise inflating their egos as "pirates."

To that band of would-be broadcasters, it is patently obvious that our
salesman here has already admitted that no Yagi Optimizer was fully
engaged to optimize the "3 element design." (And there is an absolute
lack of data for this so-called Super JPole.) As such, he is mocking
your credulity to suggest that YO would somehow be appropriate as a
package to pursue this particular goal. When marketing has such
contempt for customers, you have to wonder about them (both marketing
AND the customers).

What is even more contemptible, is the notion that the inferior design
is preferable to other designs (they abound for that very reason).
The suggestion of any superiority of the "super JPole" has already
been draped in presumptions and strained references. This is simply
the clouded judgment of a solution in search of a problem. When all
you know is about JPoles (which is arguable), then they solve all of
life's transmission woes.

Much of this tarted up comparison smacks of a quarter mile race
between a corvette and a school bus - ignoring that you wanted a
recommendation for a bicycle.

I will leave it to the more industrious customers or would-be
customers to simply download the free version of EZNEC and confirm
that this clod-hopping 3 element design above would be bettered by a 2
element one. This has already been offered by Allison to no
noticeable intelligent response. I will leave it to those who glom
onto vacuous marketing with the fatal attraction of a moth for a flame
to skip this exercise.

73's
Richard Clark, KB7QHC