01- 2012, # 016
Vertical Antenna for 80-, 40-, 20-, 15- and 10-
Yuri Medinets, UB5UG,
Credit Line: Radio # 9, 1960, p. 44
The antenna is designed
to work at 80-, 40-, 20-, 15- and 10- meter Bands without any commutation in the
ATU (Antenna Tuning Unit). It is reached with the help of ATU
made on the base of an open stub that is connected to the vertical
radiator and counterpoises. The stub made from a coaxial cable
and has electrical length 0.5- lambda at the 80- meter Band.
Figure 1 Current distribution along
the antenna and the Stub
Radio # 9, 1960
Is it possible to find terminals
at the stub where matching on the amateurs Bands 40-, 20-, 15-
and 10-meter is rather possible. Current distribution along the
antenna and the Stub is shown on the Figure 1.
Design of the antenna is shown
on the Figure 2. Length of the Vertical radiator
and length of the stub is optimized for good diagram directivity
for all working bands.