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Ground Plane for the 40,-30,-20 and 17- meter
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ANTENTOP- 01- 2012, # 016

Ground Plane for the 40,-30,-20 and 17- meter Bands

 

 

 

By: Vasiliy Samay, R7AA

Credit Line: http://news.cqham.ru/articles/detail.phtml?id=1076

 

 

The antenna is very simple. It is just vertical radiator in 10- meter length that is matched at the each working band by its own matching unit that is switched on with help of relay. However to the design I came not straight away. There were tried several multiband antennas (for example, antennas from References 1 and 2) but for some reason no one of them did not satisfied me. I could not get good SWR at each of desirable working bands of the antennas.

Friend of mine, UA7A, ex UA6CW, advised to me to use the described below antenna. He helped to me to calculate matching circuits for the antenna. Figure 1 shows schematic of the antenna. Figure 2 shows schematic of the matching units for 40,-  30,- 20 and 17- meter Bands. To eliminate static from the antenna the vertical radiator is grounded through pair resistors in 430- kOhm/2- Wtts.

Figure 2 Matching units for 40,- 30,- 20 and 17- meter Bands.

 

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May 3, 2016 23:04

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