We have first created an antenna with
parrot /export/home/davek/yagiuda-1.16/src % first example1 5 144 145
146 0.1 5
Then calculated the antenna currents with
parrot /export/home/davek/yagiuda-1.16/src % yagi example1
Calculated its performance with
parrot /export/home/davek/yagiuda-1.16/src % output example1
and optimised it many way, but best of all was in example
#4.
parrot /export/home/davek/yagiuda-1.16/src % optimise -g 17 -G 0.95
-S 0.05 -Z 12.5 example1 1000
We now check to see what the optimised antenna is like at all frequencies in the 2m ham band.
parrot /export/home/davek/yagiuda-1.16/src % yagi example1.bes
yagi compleated 0.0% f=144000000.000000 MHz
<snip>
yagi compleated 100.0% f=146000000.000000 MHz
parrot /export/home/davek/yagiuda-1.16/src % output example1.bes
output compleated 0.0%
<snip>
output compleated 100.0%
parrot /export/home/davek/yagiuda-1.16/src % cat example1.bes.dat
# Driven=1 parasitic=4 total-elements=5 design=145.000MHz
# Checked from 144.000MHz to 146.000MHz.
f(MHz) E(deg) H(deg) R jX
SWR Gain(dBi) FB(dB)
SideLobes(dB)
144.000 47.0 55.9 14.50 -10.05 3.599
11.722 19.267 0.000
144.100 46.9 55.6 14.30 -9.10 3.622
11.769 18.912 0.000
144.200 46.7 55.4 14.10 -8.14 3.649
11.817 18.504 0.000
144.300 46.5 55.1 13.89 -7.17 3.679
11.863 18.056 0.000
144.400 46.4 54.8 13.69 -6.18 3.713
11.908 17.583 0.000
144.500 46.2 54.6 13.48 -5.18 3.751
11.953 17.094 0.000
144.600 46.0 54.3 13.28 -4.16 3.793
11.996 16.596 0.000
144.700 45.9 54.0 13.08 -3.13 3.839
12.039 16.097 0.000
144.800 45.7 53.7 12.88 -2.08 3.889
12.079 15.601 0.000
144.900 45.5 53.4 12.68 -1.02 3.944
12.119 15.111 0.000
145.000 45.3 53.1 12.49 0.05
4.003 12.156 14.629
0.000
145.100 45.1 52.8 12.30 1.14
4.067 12.191 14.157
0.000
145.200 45.0 52.6 12.12 2.25
4.135 12.224 13.695
0.000
145.300 44.8 52.3 11.94 3.37
4.208 12.254 13.244
0.000
145.400 44.6 52.0 11.77 4.51
4.286 12.281 12.805
0.000
145.500 44.4 51.7 11.60 5.66
4.368 12.305 12.376
0.000
145.600 44.2 51.4 11.44 6.83
4.455 12.325 11.959
0.000
145.700 44.0 51.1 11.29 8.01
4.547 12.341 11.552
0.000
145.800 43.8 50.7 11.15 9.21
4.643 12.353 11.155
0.000
145.900 43.6 50.4 11.02 10.43 4.744
12.361 10.768 0.000
146.000 43.4 50.1 10.90 11.66 4.848
12.363 10.391 0.000
parrot /export/home/davek/yagiuda-1.16/src % more example1.bes.gai
# f(MHz) theta gain-E(dBi)
G(E)-peak phi gain-H(dBi) G(H)-peak
144.0000 -90.0000 -7.5454
-19.2672 -180.0000 -7.5454 -19.2672
144.0000 90.0000 11.7218
0.0000 0.0000 11.7218
0.0000
144.0000 270.0000 -7.5454
-19.2672 180.0000 -7.5454 -19.2672
# f(MHz) theta gain-E(dBi)
G(E)-peak phi gain-H(dBi) G(H)-peak
144.1000 -90.0000 -7.1424
-18.9119 -180.0000 -7.1424 -18.9119
144.1000 90.0000 11.7695
0.0000 0.0000 11.7695
0.0000
144.1000 270.0000 -7.1424
-18.9119 180.0000 -7.1424 -18.9119
# f(MHz) theta gain-E(dBi)
G(E)-peak phi gain-H(dBi) G(H)-peak
144.2000 -90.0000 -6.6871
-18.5036 -180.0000 -6.6871 -18.5036
144.2000 90.0000 11.8165
0.0000 0.0000 11.8165
0.0000
144.2000 270.0000 -6.6871
-18.5036 180.0000 -6.6871 -18.5036
# f(MHz) theta gain-E(dBi)
G(E)-peak phi gain-H(dBi) G(H)-peak
144.3000 -90.0000 -6.1936
-18.0565 -180.0000 -6.1936 -18.0565
<snip>