In my case changing length B on to 1-
cm caused changing resonance frequency of the antenna up to 100-
kHz at the 40- meter Band. Figure 2 shows SWR of the antenna from 5 to 19.5- MHz. The plot was taken with VNA N2PK.
Figure 3 shows SWR of the antenna at the 40- meter Band. Figure
4 shows SWR of the antenna at the 20-
meter Band. SWR was taken at the end of the coaxial cable going
from antenna. The program Zplots where the VNA is working has function
to remove length of cable (going to antenna) from the antenna
measurements.
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Figure 5 shows SWR of the antenna from 5 to 19.5- MHz with
turned on function "remove coaxial cable length." As
you can see the plot at the bands of the interest is practically
identical to plot shown at Figure
2.
The MMANA file of the Dipole Antenna for 40- and
20- meter Bands may be loaded: http: // www.antentop.org/019/dl1ba_dipole_019.htm
The file was prepared by RW4HFN. Simulation the Dipole Antenna for 40- and
20- meter Bands in MMANA shows very close theoretical parameters
of the antenna to practical obtained ones.
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