However, artificial
ground, it was variable inductor with variable capacitor and thick
wire in several meter length connected in serial, cancelled the
biting. I decided find the impedance of the antenna at the antenna
tuner. The tuner can shows value of the capacitor and inductor
that is used for matching of the antenna. In the tuner it is used
simple L- circuit, so it is possible to find impedance of the
antenna based on the value of the L and C in matching circuit.
Picture 4 shows value of the matching L- circuit on
the 10- meter band. Table 1 shows antenna impedance on the HF bands calculated
on the base of the values.
Antenna has very low
active resistance on the 20- meter bands. I found that connection
of the artificial ground increase the antenna input impedance,
so it is improve the antenna efficiency.
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However it does inconvenience-
you need tune the artificial ground on the each band. Table 2 shows antenna impedance on the HF bands with
artificial ground.
Antenna
was tested in
transmitting
mode. Antenna
works well on the 20- 10 meter Bands. As well it works satisfactory
on the 40 and 30 meters. On the 80 meter Band the antenna works
poor however I could be on the Air as on receiving and sometimes
on transmitting chat with local hams. My opinion is that the antenna
works and I will install it on my balcony.
73! de UA5AA
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