Wes,
You make the point quite well that I was trying to make before I read your
post (written simultainiously)
and at the present time NEC is seen as judge absolute.
Yes there are many ways to increase gain but you cannot use a shackled NEC
program to authenticate
the results and we often use such as a crutch.
On the subject of boom length
I was basing things on a single boom length where number, position and
physical atributes of additionion elements
are brought into play to overcome program idequacies and provide correction
of assigned dimensions to achieve maximum gain.(Is this to much to ask now
that we have the NEC tool/)
To often the accusation comes up that computor input was incorrect or not
enough segments provided e.t.c.
and a datum curve would prove a valuable tool, not only to those that use
computor modelling but also
to experimentors who seek real world answers and possibly challenge the
authenticicity of either methods
Thanks for the links,will read them later, have to get a floooooo shot now
Art


"Wes Stewart" wrote in message
...
On Sun, 17 Oct 2004 17:01:22 -0400, "G&R" makes a claim and opens
himself up to skewering:

|Hi Art,
|
|While this was the common theory many years ago, there other ways to get
|gain from an antenna other than boom length and number of elements.
|
|ie On 2m we are able to get 11.2 dBd on a 45inch boom with 3 elements
|stacked 2 wide. Yes, this is range tested see results at
|http://www.csvhfs.org/ant/CSANT04.HTML

Uh Oh! The measured data show 11.2 dBd, the advertising shows 13.97
dBd. I thought maybe I went to the Raibeam site by mistake but no, I
went he

http://www.degendesigns.com/StackedVwave.htm

I love that precision BTW. I've done a fair amount of antenna range
testing using HP 8510s for measurement receivers and I've never been
able to establish gain within 1/100 dB.

But you can do it with a ham receiver and "subjective analysis".
Congratulations.

Since you're using two 45" booms spaced 58" apart, I would argue that
you should compare your design to a 148" boom Yagi and see what
happens.

How about posting your dimensions so we can see what modeling says
about them.

One further note: The Dataq DI-194 mentioned at:

http://www.degendesigns.com/Downloads.htm

WILL NOT work with all computers. This device is powered by the
serial port and my Toshiba laptops will not drive it.