of the antenna was less 2.0:1.0 at the pass band 100- kHz. In
the vertical plane Antenna has DD similar to an ellipse with a
maximum in the radiation along the horizontal wires. Vertical
plane radiation is going at the angle near 25- degree. In the
horizontal plane the antenna has almost circular DD.
Tuning of the Antennas
of the antennas is very simple. Firstly, set the capacity of the
capacitor C1. Capacity should be 20… 23- pF for antenna for 40-
meter Band or 37… 40- pF for antenna for 80- meter Band. Then
turn on the coaxial cable to transceiver. Antenna is tuned up
to the resonance with help of capacitor C2.
Figure 7 Plastic box with Capacitors
be done either in the receiving mode- just tune the C2 on to maximum
receiving signals, or in the transmitting mode- just tune the
C2 on to minimum SWR. It is possible to tune the antenna with
the help of a FSM (Field Strength Meter). Maximum reading the
FSM is matched to the minimum SWR.
Test of the antennas
antennas were installed at my cottage where I was not so often
in the Air to be enough to get an objectively judgement about
the performance of the antennas. Antenna for the 40- meter Band
was used to me often compare to antenna for the 80- meter Band.