[Antennaware] plot comparisons - addition

Terry Conboy n6ry at arrl.net
Thu Nov 12 16:36:25 PST 2009

When I overlay the elevation plot for a 4 square array on top of the 
plot of single vertical, the plot for the single vertical is ~5 dB down 
from the 4 sq.  I tried setting the reference gain for the outer ring of 
the plot to a fixed higher value (in Desc Options) before saving the 
plot to shrink it, but the program still displays the higher gain 
antenna plot larger than the lower gain antenna by the ratio of the 
gains when overlaid.  I see Dave's dilemma.

Perhaps Gary has an option set that I have missed to allow the maxima of 
the plots to be coincident, even though the absolute gains differ.

73, Terry N6RY

On 2009-11-12 11:55 AM, K9AY wrote:
> Dave,
> EZNEC does this automatically if you recall a saved trace and add it to the 
> current trace.  If you are overlaying exported bitmap files in a graphics 
> program, choose a fixed outer ring value in the 'Desc Options' setup.
> Gary
> K9AY
>> This question is a long shot, but knowing the resourcefulness of the
>> group I thought I would ask anyway..
>> I am doing some comparisons of various receive antennas, some of
>> which have very different gains.  I am overlaying different plot
>> files to compare the patterns, especially the pattern off the back.
>> This has been quite difficult on occasions because of the big gain 
>> differences.
>> I wondered if there was a way to "normalise"  the gain of two plots
>> so as to be able to get an easier comparison?  Another way of saying
>> it would be to able to make the gain of the outer rings of two plots 
>> identical?
>> Is it possible or are there any other techniques to simplify the 
>> comparisons?
>> Thanks for any ideas.
>> 73,
>> Dave, G3UEG
>> I should have added that I am using EZNEC+  V5

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