parrot /export/home/drkirkby/yagiuda-1.18/src % optimise -o1 example1 1000
Will optimise insisting all selected parameters improve.
Optimising for maximum possible gain.
1 G= 9.65dBi,FB= 12.30dB,SL= 0.00dB,SWR= 1.93,Z=
42.42-j 29.86
15 G= 9.68dBi,FB= 15.64dB,SL= 0.00dB,SWR= 7.24,Z=
9.03-j 27.41
59 G= 9.86dBi,FB= 9.70dB,SL= 0.00dB,SWR= 6.91,Z=
25.83-j 77.08
62 G=12.05dBi,FB= 9.32dB,SL= 0.00dB,SWR=99.00,Z=
0.30-j119.67
81 G=20.99dBi,FB= 3.03dB,SL= 0.00dB,SWR=99.00,Z=
0.01-j 73.43
299 G=23.71dBi,FB= 3.24dB,SL= 0.00dB,SWR=99.00,Z=
0.00-j 67.07
537 G=30.11dBi,FB= 3.23dB,SL= 0.00dB,SWR=99.00,Z=
0.00-j 67.60
668 G=30.97dBi,FB= 3.01dB,SL= 0.00dB,SWR=99.00,Z=
0.00-j 68.22
731 G=35.75dBi,FB= 3.06dB,SL= 0.00dB,SWR=99.00,Z=
0.00-j 68.04
851 G=38.76dBi,FB= 3.05dB,SL= 0.00dB,SWR=99.00,Z=
0.00-j 68.05
868 G=56.39dBi,FB= 3.04dB,SL= 0.00dB,SWR=99.00,Z=
0.00-j 68.04
The best design is in a file "example1.bes". You should check it
thoroughly
and if its better than example1, copy example1.bes to example1
For your inforation, the original data on the antenna was:
Start data:G= 9.65dBi,FB= 12.30dB,SL= 0.00dB,SWR= 1.93
Final data:G=56.39dBi,FB= 3.04dB,SL= 0.00dB,SWR=99.00
Changes: G=46.74dBi,FB= -9.26dB,SL= 0.00dB,SWR=97.07
parrot /export/home/drkirkby/yagiuda-1.18/src %
As you can see, it has a high theoretical gain, but the input resistance is 0.00 Ohms and it has a VSWR of over 99. The antenna would be useless.
To see what it looks like, see the file example1.bes
parrot /export/home/drkirkby/yagiuda-1.18/src % cat example1.bes
NOTES ð
FREQUENCY 145.000000
MIN_FREQUENCY 144.000000
MAX_FREQUENCY 146.000000
STEP_FREQUENCY 0.100000
ELEMENTS 5
DRIVEN 1
PARASITIC 4
ANGULAR_STEP 180.000000
#DATA_DRIVEN x
y length diameter
voltage(r) voltage(i)
DATA_DRIVEN 0.48181 0.00000
0.90025 0.00500 1.00000
0.00000
#DATA_PARASITIC x
y length diameter
DATA_PARASITIC
0.00000 0.00000 1.13786
0.00500 reflector
0.46069 0.00000 0.97158
0.00500 D1
0.83419 0.00000 0.94493
0.00500 D2
1.15742 0.00000 0.92675
0.00500 D3
parrot /export/home/drkirkby/yagiuda-1.18/src %