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New DK7ZB's ultralight yagis |
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Martin Steyer DK7ZB has published a new conception of his yagis. These yagis are cheap and simple to built. It's an ideal solution for portable use due their extreme lightweight.
DK7ZB has designed a range from 2el. yagi till 7el. yagi for 2m band and 9el. yagi till 14el. yagi for 70cm band. Used are aluminium welding rods with 3 or 4mm diamaeter, boom is made of PVC-tubes with 16mm, 20mm or 25mm diameter, the element holders are the clamps for these tubes.
All yagis have an impedance of 50 Ohms and are feeded with a lambda/4-choke for 2m and a 3/4-lambda-choke for 70cm. This 50ohm design has greater bandwidth and less critical dimensions althrouht they have a less gain.
Description of DK7ZB yagi is here.
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