| 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) |
7-Element-28-Ohm-Yagi with 9.20m-Boom
Short data: Gain 10.8 dBd, F/B >30dB, bandwidth 700KHz (49.8-50.5 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. I used that Yagi with very good results for two years.
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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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Element |
Element-position (mm) |
Element-length (mm) |
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R |
0 |
2960 |
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DE |
970 |
2900 |
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D1 |
1660 |
2770 |
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D2 |
3215 |
2700 |
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D3 |
5080 |
2660 |
| D4 | 7360 | 2660 |
| D5 | 9120 | 2610 |
Match with 2xLambda/4 75-Ohm-coax in parallel to a grounded socket, feedpoint impedance 50Ohm.
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Gain, SWR, F/R, Z for the 7-Element-Yagi Maximum of F/R in the middle part of the band, good balance of all parameters.
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The Element-Current-Profile at 50.150MHz plotted with "YO" shows the basis for the good pattern. Yagis with bad profile have many sidelobes, poor F/R and not the best gain. |
