| 4-El-12,5-Ohm (2,90m) | ||
| 5-El-12,5-Ohm (6,00m) | ||
| 7-El.-28+50Ohm (9,20+7,75m) | 8-El.-28-Ohm (12,30m) | 9-El.-28-Ohm (14,00m) |
| 4-El-28-Ohm (2,20m) | 5-El-50-Ohm (4,30m) new | 6-El-50-Ohm (6m+7,20m) new |
7-Element-28-Ohm-Yagi with 9.30m-Boom
(7-El.-50-Ohm-Yagi with 7.75m-Boom (see down)
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Gain 10.9 dBd (13.05 dBi), F/B 30dB Bandwidth 1MHz (49.8-50.8 MHz) at SWR < 1.5 This Yagi was built first for 2m and and the pattern was verified by measurement. After that the Yagi was scaled for the 6m-Band. |
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7-El.-28-Ohm-Yagi built by Dave, N8OC
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7-El.-28-Ohm-Yagi built by Kalle, DD6BKR |
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2x7-Ele stacked at GM2T (Photo tnx to Colin, GM0RLZ) |
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Data updated Februar 2009, all elements 12mm diameter
With a tapered 16mm/12mm-Radiator as shown at the 50-Ohm-Yagi below the length will be 2900mm!
|
Element |
Element-position (mm) |
Element-length (12mm) |
|
Ref |
0 |
2920 |
|
Rad |
1080 |
2860 |
|
D1 |
1740 |
2776 |
|
D2 |
3250 |
2688 |
|
D3 |
5175 |
2648 |
| D4 | 7420 | 2640 |
| D5 | 9300 | 2590 |
Match with 2xlambda/4 75-Ohm-coax in parallel to a grounded socket, feedpoint impedance 50Ohm (DK7ZB-match)
The element-current-profile at 50.150MHz shows the basis for the good pattern. Yagis with bad profile have many sidelobes, poor F/R and not the best gain.
7-El.-50-Ohm-Yagi with 7.75m-Boom
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Broadband-Yagi Gain 10,19 dBd (12,34 dBi) F/B 21dB Feeding with a 50-Ohm-coax-choke |
|
Element |
Element-position (mm) |
Element-length (10mm) |
Element-length (12mm) |
|
Ref |
0 |
2950 |
2950 |
|
Rad |
835 |
2886 |
2888 |
|
D1 |
1285 |
2770 |
2720 |
|
D2 |
2650 |
2690 |
2680 |
|
D3 |
4390 |
2670 |
2660 |
| D4 | 6170 | 2670 | 2660 |
| D5 | 7695 | 2590 | 2570 |
The current profile plotted with EZNEC +5
