2-Element parasitic Yagis by DK7ZB – 10 15 20 30 meters

 

2-Element parasitic Yagis by DK7ZB for the Shortwave-Bands 10m-30m
No other antenna has a better relation between gain and expense than the 2-Element-Yagi. One element additional to the dipole will give you 4dB gain. Each further element will give much more mechanical problems and the increase in gain is only 1-2dB for the same bandwidth. What says the ARRL-Antenna-Book about this antenna? “The must bang for the buck”. Right!

Because the 10m, 15m and 20m-Bands need a greater bandwidth, the radiation resistance must be higher than for the smaller WARC-Bands. Therefore we take the Yagis with radiator-reflector and 50Ohms for 10m (greatest bandwidth), 28Ohms for 15 and 20m and the Yagis with radiator-director and 28Ohms for the WARC-Bands.

If you have a height above ground of 10m or higher for a 12m-Yagi, you can try a 12,5Ohm-type for that band. The antenna needs a very clear surrounding! With a very short boom and small bandwidth you get very high F/B.

Construction Details

2-El.-10m-50Ohm

2-El.-12m-12Ohm

2-El-12m-28Ohm

Dualband 12/17m

2-El.-15m-28Ohm

2-El.-17m-28Ohm

2-El.-20m-28Ohm

2-El.-30m-28Ohm

Dualband 10/15m

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