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Here is how to use the W5GFE "Jiffy" system:
1. create a NEC input file. For our purposes, let us call
it "firstrhombic".
2. Use the command
wires.tcl firstrhombic
to draw a sketch of the antenna.
3. Use the command
preelev.tcl firstrhombic > temp1
to create a file called "temp1" that contains an appropriate
RP card.
4. Use the command
nec
with an input file of "temp1"
to create an output file. Name the output file "fort.2"
5. Use the command
elevpatterns.tcl fort.2
to display elevation patterns and some facts about the
antenna.
Note the angles of maximum radiation on the fact window.
Suppose you discover that the angle of maximum radiation is
67.0 degrees.
6. Use the command
preazimuth.tcl firstrhombic 67.0 > temp2
to create a file with the right RP card for 67.0 degrees.
7. Run nec again, with input of "temp2" and capture the output,
say in file "fort.2"
8. Run the command
azpatterns.tcl fort.2
to provide some graphs of the azimuth patterns.
Enjoy!
73 de Bill W5GFE
bw@cs.ecok.edu
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