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.

4. http://www.antentop.org/017/ua6agw_md_017.htm

5. Antennas, Karl Rothammel, Nash Gorod, Minsk- 2001

Figure 4 Diagram to Estimate Antenna Gain for the Antenna UA6AGW V. 7.00

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