ANTENTOP- 01- 2020 # 024

Antenna with Rotating Directional Pattern for the 80, 40, 20, 14 and 10 meter Band

Figure 5 Stator of the Capacitor

Figure 6 Rotor of the Capacitor

Several words about the ATU: Transformer T1 isolated ATU (with antenna system) from the transmitter. The transformer was made on a ferrite ring, it is possible use any suitable ring. Soviet radio-amateurs ever used to a ferrite from yoke transformer of TV. Inductor L1 may be tapped (should be chosen right tap for every band) or used a variometer inductor. The impedance of the antenna system is not 50-Ohm. At that time most of Soviet hams used to transmitters with tube PA that can be matched with load having impedance from 10 to 1000 Ohm. So, if you do not use a tube PA, you should use additional ATU between the antenna and transistor transceiver.

How the antenna works: First at all it needs with help of the C6 capacitor set up direction to the receiving station. The direction is set up on to maxima receiving signal. Then with help of the C5 set up the optimal direction diagram of the antenna. Inductor L1 should be installed to optimal inductivity (find in practical way) for the antenna. After that PA should be tuned to maxima output power. That is all, happy QSO!

73! de RA6AA and UV6AF

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