Short data:
Gain 6.4dBd
F/B 20dB
bandwidth 500KHz (49.9-50.4 MHz) at SWR < 1.5
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3-El.-12,5-Ohm (1,90m) |
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| 4-El-12,5-Ohm (2,90m) | ||
| 5-El-12,5-Ohm (6,00m) | ||
| 7-El.-28-Ohm (9,20mm) | 8-El.-28-Ohm (12,30m) | 9-El.-28-Ohm (14,00m) |
3-Element-12,5-Ohm-Yagi with 1,90m-Boom
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Short data: Gain 6.4dBd F/B 20dB bandwidth 500KHz (49.9-50.4 MHz) at SWR < 1.5
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Link: Details of a built yagi with a lot of Photos on the Homepage of DL1GNM
Updated dimensions (18-July-2006) for a little bit more bandwidth, new antenna built and tested :
| Element | Element-position | Element-length (12mm) | Element-length (10mm) |
| Ref | 0mm | 2970mm | 2974mm |
| Rad | 600mm | 2820mm (see text below) | 2820mm (see text below) |
| Dir 1 | 1850mm | 2654mm | 2666mm |
Middle part of the radiator for 12mm and 10mm parasitic elements 2x150mm of 16x1,5mm, outer ends 12x1mm, length tip to tip. Fine-tuning by shifting the 12mm-parts.
Match with 2xLambda/4 50-Ohm-coax in parallel to a grounded socket, feedpoint impedance 50Ohm.
An other construction for the radiator is a folded dipole with an impedance of 50Ohm (4x12.5Ohm). At the feedpoint use a toroid balun 1:1 (T 200-6) to match the symmetrical load to the coax-cable.
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