| 4-El-12,5-Ohm (2,90 m) | ||
| 5-El-12,5-Ohm (6,00 m) | ||
| 7-El.-28+50Ohm (9,20+7,75 m) | 8-El.-28-Ohm (12,30 m) | 9-El.-28-Ohm (14,00 m) |
| 4-El-28+50-Ohm (2,20 m) | 5-El-50-Ohm (4,30 m) new | 6-El-50-Ohm (6m+7,20 m) new |
4-Element-50-Ohm-V-Yagi with 2,20m-Boom
Two Yagis with 2,20m boom and 28 and 50 Ohm see down!
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This Yagi is a new development with an outstanding
pattern. The radiator is bent to a "V" with the result that
the impedance of the 28-Ohm-Yagi is raised to 50 Ohms and the F/R is
really impressive! The bandwidth is smaller as with the 28-Ohm-OWA-Yagi,
but broad enough.
The tips of the radiator are bent with an angle of 5,5° towards the reflector. Gain 6,65 dBd F/B 33 dB Boom 2,20 m |
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Picture left: The schematic structure of the Yagi Elements: 10 mm diameter (3/8') Positions of the elements and lengths per half of each element Lengths over all:
The EZNEC-File for your own investigation: |
4-Element-28-Ohm-OWA-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 |
The Yagi built by Attila, DL1NUX
Further details with many pictures on his homepage LINK
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The Yagi built by Geir, LA6TPA
Details about his Yagi: |
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The Yagi built by Ludek, OK2IEN |
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The Yagi built by Steve, HA0DU The antenna was used for the DX-peditions J5NAR and 6W/HA6NAR |
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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 |
0 mm |
2980 mm (10 mm) |
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Rad |
510 mm |
2930 mm (see picture) |
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D1 |
965 mm |
2776 mm (10 mm) |
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D2 |
2180 mm |
2574 mm (10 mm) |
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4-Element-50-Ohm-Yagi with 2,20m-Boom
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Medium bandwidth, high gain design Gain 6,8 dBd F/B 15 dB 3-dB-angle E-plane: 58,4° 3-dB-angle H-plane: 84,2° |
The 4-El.-50-Ohm-Yagi by Dave, F5SDD
Element lengths and element-positions (no tapered Radiator!)
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Element |
Position |
12 mm |
1/2 '' | 10 mm | 3/8 '' |
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Ref |
0 mm |
2934 mm |
2930 mm | 2940 mm | 2940 mm |
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Rad |
910 mm |
2818 mm |
2820 mm | 2824 mm | 2826 mm |
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D1 |
1150 mm |
2750 mm |
2750 mm | 2760 mm | 2763 mm |
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D2 |
2170 mm |
2708 mm |
2702 mm | 2720 mm | 2724 mm |
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