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EZNEC User Manual
EZNEC Editor
The EZNEC Editor is basically a copy of the Windows Notepad functionality.
It's used as a convenient way to edit text files from within EZNEC. Controls,
menus, and operation are very similar to Notepad, although occasionally you'll
see a difference. The EZNEC editor is automatically opened to display a
number of EZNEC files and outputs.
A few words about fonts -- When used for displaying tabular outputs like
Currents, Source Data, Far Field Table, and so forth, the EZNEC Editor
restricts your choices to fixed-width fonts such as FixedSys and Courier New.
This permits the columnar data in these files to be properly aligned. Some
fonts, such as FixedSys, are screen fonts only and can't be printed. If this
happens, either Windows or EZNEC will substitute another font during
printing. If Windows substitutes a variable-width printer font for a fixed-width
screen font, the columns in certain outputs won't line up properly. If this
happens, select a printable fixed-width font. The Editor will remember the last
fixed width font you chose, and will continue to use it in the future until you
change it again.
You can use the EZNEC Editor to view or edit any file, not just EZNEC files,
by selecting View File or Edit File from the Control Center File menu. The only
difference between these two is that if you open a file with the View File
selection, you won't be allowed to save it under the same name. That is, it
protects the original file from being changed by the editing process.
Frequency Sweep
EZNEC's frequency sweep capability can be a very valuable tool in evaluating
antenna performance over a range of frequencies. However, operation is
somewhat different in the frequency sweep mode, so it's important to
understand the operation in order to get the most from this feature. Note that
the frequency "sweep" is actually discrete steps. These can be evenly spaced
or, if read from a file, any frequencies in any order.
In non-frequency sweep operation, EZNEC calculates antenna impedances,
currents, and pattern, and keeps the current and pattern information. When
changes are made to the antenna, only necessary recalculations are done.
For example, when the plot elevation angle is changed, only the pattern is
recalculated. This is not the case with frequency sweep. It's not practical to
keep all the information for all frequencies, so final calculation results are
written into an ASCII file after each frequency step. Data present in arrays are
erased and EZNEC is reset before beginning calculations at the next
frequency. Therefore, calculation results from a frequency sweep are
available only in the form of the file containing the data and, optionally, a trace
for each frequency. The exception to this is that data from the last frequency
in the sequence can be viewed.
The frequency sweep can be run only when the Control Center Plot Type
selection is Azimuth or Elevation. It can't be run when 3D plot type is selected.
One or two outputs are available from the frequency sweep: data output is
always available for selection; 2D far-field plots (traces) are available only
when far-field analysis (EZNEC Pro: with or without ground wave) is chosen
for frequency sweep. You can choose to have EZNEC save any combination
of these. Additional impedance and SWR data are always saved, in a
separate file, regardless of the outputs you choose to keep. These data are
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