| 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) |
| 4-El-28-Ohm (2,20m) |
4-Element-28-Ohm-Yagi with 2,20m-Boom
Short Yagi with great bandwidth, SWR <1,5 for 2MHz
Design good for mounting 1,50m above a short-wave beam without detuning
Description in magazin "Funkamateur" 6/2006
Important: In the "Funkamateur" article is a mistake for the length of D1 (my failure)!
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Gain 6,2dBd F/B 24dB |
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Construction of the radiator with 2x250mm of 16x1,5mm alu and end pieces of 12x1mm for tuning. Given length of 2930mm is from tip to tip. |
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The picture shows the construction of the radiator in the middle part with the mounting, the insulation and the choke. For other details see the page "construction details". |
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The parasitic elements are constructed with one tube of 10mm diameter, the mounting clamps are the same as I use for the 2m- and 70cm-Yagis. An additional piece on the top gives better mechanical stability. |
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The 2,20m-boom has two parts of 20x20x2mm square aluminium and an additional part with 1m length for better stability |
Element lengths and element-positions
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Element |
Element-position |
Element-length |
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Ref |
0mm |
2980mm (10mm) |
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Rad |
510mm |
2930mm (see picture) |
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D1 |
965mm |
2776mm (10mm) |
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D2 |
2180mm |
2574mm (10mm) |
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