Three Elements Active Directional Receiving Loop HF Antenna

Main RF Amplifier as well placed in metal box. It should be placed as close as possible to the receiver. The box contains RF connector for connection to the loops and RF connector to connection to the receiver. Instead of the tuning circuit with variable capacitor it may be used several switching resonant circuits for every used band of the antenna. It is depends on the purpose of the receiving antenna.

Loops of the antenna wound in specific way. Second loop is wound in opposite direction to the first loop. So, if First Loop wound in one direction, the Second loop is wound in opposite direction to the First loop and Third loop wound in opposite direction to the Second loop or in the same direction as the First loop.

Data for the loop of the antenna

Loop 1: Wound on square with sizes of 450 x 450- mm: contains 3 turns;

Loop 2: Wound on square with sizes of 475 x 475- mm: contains 4 turns;

Loop 3: Wound on square with sizes of 500 x 500- mm: contains 5 turns.

FET transistor 2N3823 may be used for all of the three RF Amplifiers that placed near the Loop. FET transistor CP651 may be used at RF Amplifier with the resonant circuit. It is possible use modern FET transistors with the same parameters.

73! de R. I. Miller and Nikolay Vyachin (RW4CF)

Front Cover

Radio- Design # 21

Figure 2 Schematic of the Three Elements Active Directional Receiving Loop HF Antenna

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