Three Elements Active Directional Receiving Loop HF Antenna

Three Elements Active Directional Receiving Loop HF Antenna

Credit Line: Radio- Design # 21, pp.:77- 78.

By: R. I. Miller and Nikolay Vyachin (RW4CF)

The small sized directional antenna provides excellent receiving capability ever inside a room. The antenna was designed for receiving weak signals from amateur radio stations however the antenna may be used for receiving of the broadcasting radio stations. The antenna significantly improves Signal/Noise ratio at receiving weak radio signals. Figure 1 shows design of the Three Elements Active Directional Receiving Loop HF Antenna.

The antenna contains three wire square loops that are placed along a dielectric boom. The boom may be made from a wooden stick or plastic tube. The loops are wired with copper wire in 0.8- mm (20-AWG) diameter. The loops are placed on a form from cross wooden stick. Handling boom is placed in the center of the cross.

Distance between the centers is 600- mm. Copper wire placed along the boom that connected to the ground of the loop and ground of the RF- Amplifiers that placed near the every loop. Figure 2 shows schematic of the Three Elements Active Directional Receiving Loop HF Antenna.

Each RF Amplifier is placed in small metal box with RF connector upside. Through a T connector the amplifiers connected together and with the main RF amplifier. Either 50- or 75 Ohm Coaxial cable may be used for the connection. The all three RF Amplifiers work on the main RF Amplifier that has a resonant circuit that tune to receiving signals.

Figure 1 Design of the Three Elements Active Directional Receiving Loop HF  Antenna

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