2-El.-12,5-Ohm (0,35m) |
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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) |
| new 4-El-28-Ohm (2,20m) |
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2-Element-12,5-Ohm- Yagi with 0,35m-Boom Stacked Array 2 over 2 see down! Short data: Gain 4.5dBd, F/R >20dB, bandwidth 300KHz (50.0-50.3 MHz) at SWR < 1.5, -3dB hor. 67,4°, -3dB vert. 129,4° The antenna has an unbelievable pattern, but must have a very clear surrounding! Do not use this Yagi in a "christmas-tree" of other antennas.
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Mounting of the Director (10mm) with an isolated clamp and 20x20mm-Boom |
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Mounting of the Director (12mm) with an isolated clamp and 20x20mm-Boom
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The 2x50Ohm- Transformer with two Lambda/4-cables coax RG-188 (Teflon), wound as a choke Length see table in
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Radiator: Center part 2x200mm, 16x1,5mm outer parts 12x1mm change length for best SWR
Director 10 or 12mm, see below
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Mechanical Dimensions for a single Yagi:
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Element |
Element-position (mm) |
Element-length (mm) |
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Rad |
0 |
2970 mm (see details above!) |
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Dir |
350 |
2810 (12mm), 2818 (10mm) |
Plots with EZNEC for a single Yagi
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0dBd = 4,55dB Gain (Azimuth) |
0dB = 4,55dB Gain (Elevation) |
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The stacked Array 2 over 2
This is a very interesting antenna, gain 8,5dBd and lightweight construction. The ultimate antenna for DX-peditions and portable use! Great horizontal and small vertical 3dB-angle. Very important: The stacking distance must be 4,50m and the antennas have other lengths than a single Yagi. Stacking with 2x3/4-Lambda 75-Ohm-coax, e.g. 2x3,00m RG-59 or RG-11. See the stacking scheme at the construction details page. Here I have used 2x3,0m RG-59. The first antenna must be >3m (lambda/2) above ground! -3dB hor. 68,2° -3dB vert. 37,4°
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Mechanical Dimensions for the stacked Yagis 2 over 2:
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Element |
Element-position (mm) |
Element-length (mm) |
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Rad |
0 |
2960 mm (see details above!) |
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Dir |
350 |
2822 (12mm), 2830 (10mm) |
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0dB=8,52dBd (Azimuth) |
0dB=8,52dBd (Elevation) |
