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Directional Antenna UA6AGW V. 7.00

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 ANTENTOP- 01- 2014 # 018 Directional Antenna UA6AGW V. 7.00 Width of the DD in horizontal plane (at level 3- dB) is near 60 degree. Level F/B is not less 20- dB. Level F/S is near 15 dB. At day time the antenna suppresses local stations (in radius 300- 350- km) on to 20- 30- dB. So the main lobe in vertical plane should have angle in 35- 40 degree.   Antenna gain was estimated according to diagram and formulas from page 61 at Reference 5. Antenna gain for the antenna should be near 10- dB. Figure 4 shows the diagram. Summary:  1.     Antenna UA6AGW V. 7.00 differs little from the prototype but turns to directional antenna. 2.     Having small dimension the antenna compare to them has good F/B ratio in 20-dB. 3.     F/B and F/S ratio for the antenna is constant at working range. 4.     There is a real possibility to design small directional antenna for the 80- meter Band. 5.     Antenna keeps all merits of the prototype. 6.     Antenna is simple to design and easy to tune Picture 6 Screen Shot from SDR Transceiver with Compared Antennas Figure 3 DD of the Antenna UA6AGW V. 7.00 in Horizontal Plane   References:   1. Antenna UA6AGW V.40, Aleksandr Grachev, Radio # 2, 2011, pp.: 59- 61 2. Antenna UA6AGW V. 80, Aleksandr Grachev, Radio 8, 2011, pp.: 60- 61. 3. Experimenters with Magnetic Loop Antennas, Aleksandr Grachev, CQ-QRP # 27, 2009, pp.: 9- 11. 5. Antennas, Karl Rothammel, Nash Gorod, Minsk- 2001 Figure 4 Diagram to Estimate Antenna Gain for the Antenna UA6AGW V. 7.00 Page- 39

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