Cecil-- think what he wants is a Pattern, of
antenna 1, layed over Pattern 2, Both referenced
to Each other (at a 0 dB reference. ) but as
stated, don't think the (-3) angle will change
drastically, nor the F.B. Ratio! Jim NN7K



Cecil Moore wrote:
amdx wrote:
I want the maximum gain point of each antenna to
reach the same point on the plot.

If the two antennas have different take-off-angles, that
will require a graphics program capable of rotating one
of the graphics by n degrees.
--
73, Cecil, w5dxp.com

"amdx" wrote in message
...

"amdx" wrote in message
...

"Cecil Moore" wrote in message
et...
amdx wrote:
I have put a picture on abse to show what I want.
Subject Line: Two Flag Patterns.

I doubt you can do that within EZNEC. It will probably
require generating two graphics and superposing them -
which you can accomplish by changing the reference gain
of the outer ring in EZNEC and using, e.g. MS Paint
for the superposition.
--
73, Cecil, w5dxp.com

I'll give that one a try.
Thanks again, Mike

Hey Cecil, That does exactly what I wanted, although not
in the program I wanted.
Thanks, Mike

I have never used it, but there is a button on the main screen labeled Ref
Level, defaults to 0 dbi.

Tam/WB2TT

P.S. Check out the "Traceview" option, at least
in EZNEC 5. Go to "View", then open "Traceview"!
Think this might allow you to compair 2 overlayed
patterns-- tho haven't gone thru manual-- YET!
Jim NN7K

Tam/WB2TT wrote:

"Jim - NN7K" wrote in message
...
Cecil-- think what he wants is a Pattern, of
antenna 1, layed over Pattern 2, Both referenced
to Each other (at a 0 dB reference. ) but as
stated, don't think the (-3) angle will change
drastically, nor the F.B. Ratio! Jim NN7K



Cecil Moore wrote:
amdx wrote:
I want the maximum gain point of each antenna to
reach the same point on the plot.

If the two antennas have different take-off-angles, that
will require a graphics program capable of rotating one
of the graphics by n degrees.
--
73, Cecil, w5dxp.com

Just for fun and discussion I posted a plot with 6 different size
Flag antennas.
See it on abse, Subject line: Multiple Flag Ant. Patterns
Mike

And, BTW, this DOES allows comparison of Plots, from
2 (or more?) antennas. I Tried it, works Great!
Jim

Jim - NN7K wrote:
P.S. Check out the "Traceview" option, at least
in EZNEC 5. Go to "View", then open "Traceview"!
Think this might allow you to compair 2 overlayed
patterns-- tho haven't gone thru manual-- YET! Jim NN7K

Tam/WB2TT wrote:

Dave wrote:
I am wondering what type of antenna has -19 or -23 dBi gain. I would
speculate that they are quite omnidirectional, and the patterns wouldn't
be significantly different.

It's tough to get gain that low unintentionally. If they are commercial,
could you please point me at a web site? I'd love to see why they made
these.

tom
K0TAR

but 0dBi would be perfectly omnidirectional by definition. either he is
reading the scale wrong or is looking at f/b ratio instead of gain, or maybe
looking at depth of a null or sidelobes.



Actually they could have gain that low and still be directional. It
would probably be silly to do so, but with nice lossy components, quite
possible.

Heck, I bet someone here may have even done something like it for some
reasonable engineering design.

tom
K0TAR

"Jim - NN7K" wrote in message
t...
And, BTW, this DOES allows comparison of Plots, from
2 (or more?) antennas. I Tried it, works Great!
Jim

Jim - NN7K wrote:
P.S. Check out the "Traceview" option, at least
in EZNEC 5. Go to "View", then open "Traceview"!
Think this might allow you to compair 2 overlayed
patterns-- tho haven't gone thru manual-- YET! Jim NN7K

Tam/WB2TT wrote:

Hi Jim,
I tried this and it's not working for me.
I can only get one trace in the view.
Can you walk me through your sequence of clicks?
Thanks, Mike

"Tom Ring" wrote in message
. ..
Dave wrote:
I am wondering what type of antenna has -19 or -23 dBi gain. I would
speculate that they are quite omnidirectional, and the patterns wouldn't
be significantly different.

It's tough to get gain that low unintentionally. If they are
commercial, could you please point me at a web site? I'd love to see
why they made these.

tom
K0TAR

but 0dBi would be perfectly omnidirectional by definition. either he is
reading the scale wrong or is looking at f/b ratio instead of gain, or
maybe looking at depth of a null or sidelobes.

Actually they could have gain that low and still be directional. It would
probably be silly to do so, but with nice lossy components, quite
possible.

Heck, I bet someone here may have even done something like it for some
reasonable engineering design.

tom
K0TAR

Do a little research on the Flag or pennant antenna.
It's a rotatable antenna that has a good f/b ratio at low
frequencies. I've measured 40db f/b at 1430khz.
I have a variable termination.
Mike

Try this (with Eznec 5)

Step 1 Open (or write) your file.
Step 2 Do farfield plot , then save
this file as (Tracefile (.pdf,pdf3)
You need to name this file!.

Step 3 Do the SAME steps for Antenna #2 (and
3,4,5, ect) be sure to use diff names!

Now, Step 4,go to (view, traceview), and this

will give a warning.Run , under the "traceview
window, the FIRST FILE you named.

Step 5 Now , click on "Add trace". insert the name of
the SECOND file you saved ( Warning- both must be in
SAME direction, AZMATH, or ELEVATION for this to
overlay) , and both ants pointing the SAME WAY!

Step 6 either print it, or add another file .
Think you find this works pretty well .
NOTE: this DOESN'T set yhe max gain to BOTH
antennas, but is great for comparison purposes.
Think its pg 93 in the pdf manual (not to be confused
with 93 on the adobe screen!
Jim NN7K

amdx wrote:


Hi Jim,
I tried this and it's not working for me.
I can only get one trace in the view.
Can you walk me through your sequence of clicks?
Thanks, Mike

On Wed, 13 Jun 2007 19:45:35 -0500, Tom Ring
wrote:

Actually they could have gain that low and still be directional.
....
Heck, I bet someone here may have even done something like it for some
reasonable engineering design.

.... tsk, tsk, tsk. Such a fall from grace for the fractal antenna.
Gone, and long forgotten.

73's
Richard Clark, KB7QHC