Antenna V. 20-10.51 can work in frequency range from 14.0 to 29.5
MHz that is covered 20. 17, 15, 12 and 10- meter amateur Bands.
This is provided by tuning the antenna in resonance to the used
band with help of a remote- control variable capacitor installed
at the antenna. UA6AGW Antenna V. 20-10.51 is designed for easy
and quick installation in the field. Figure 1 shows schematic diagram of the antenna.
At the end of the all it was designed
Universal Field Antenna. The
antenna may be installed at any open place in the forest, on the
mountain, on the shore as well at a small boat or truck. Antenna
may be installed by force of one man. Antenna could stand storm
diagram of the UA6AGW Antenna V. 20-10.51 is the same as for previously
published UA6AGW omnidirectional antennas (Reference
1). Figure 1 shows dimensions for the range of 18.0-
29.0- MHz. For lower edge of the working
range - 14.0- 18.0- MHz the horizontal wires placed under antenna
should be extended to 3- meter length and additional capacitor
should be switched in bridge to C2.
Design of the Antenna
be compatible for transportation in the car it was set up some
limitation factors when the Antenna was designed.
Length of any part of the antenna should not be more the
2 meter length.
Diameter of the loop should not be more the 1 meter.
DD of the antenna
in the horizontal plane should be circular.
was mounted on the sectional plastic mast in 6- meter height.
Each section is in 2- meter length. Figure 2 shows the UA6AGW Antenna V. 20-10.51
on the mast. The antenna mast does not required
mast is a commercial made one 8- meter height plastic mast named
“Mast 8-2U” that is produced by R- QUAD (Reference 2).
There are used only 3 sections (from 4 sections for 8- meter height)
for 6- meter height. Mast stays vertically and firmly with help
of two struts. Figure 3
shows the mast in vertical position. The struts fastened to the
ground with help of a metal peg. Figure 4 shows strut fastened to the ground.
Main loop of the antenna made of 1/2 inch corrugated
coaxial cable. Outer plastic was removed. For protection from
weather conditions it was used snap- up plastic tube for electrical
wires. Horizontal wires were made from telescopic
pair of aluminum tubes.