5-El.-28-Ohm-Yagi (1,50m-Boom), broadband
(another 50-Ohm-Yagi see down)
1,50m-Boom 8,3dBd Gain F/R >20dB SWR<1,2 at 144-146MHz
Stacking distance 2,05m
Short data for the Yagi at the begin, in the middle part and at the end of the band
Plot with the NEC-II-reference of YO7.23 by K6STI
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The meaning of the data : Frequency, gain, F/R, radiation resistance (impedance), SWR and loss against a theoretical defined maximum- gain-Yagi with the given boomlength. Remember that this gain is only available with very low impedance and extrem low bandwidth! The red line shows the profile of the element currents. |
Elementpositions and Elementlengths, Radiator always 10 mm diameter!
| Diameter | Ref | Rad (10mm) | Dir 1 | Dir 2 | Dir 3 |
| 12,7 mm | 1018 mm | 973 (12,7 mm) | 928 mm | 915 mm | 884 mm |
| 10 mm | 1020 mm | 978 mm | 935 mm | 923 mm | 893 mm |
| 8 mm | 1022 mm | 980 mm | 942 mm | 930 mm | 900 mm |
| 6 mm | 1024 mm | 980 mm | 948 mm | 937 mm | 907 mm |
| 4 mm | 1026 mm | 980 mm | 956 mm | 945 mm | 917 mm |
| Position | 0 mm | 315 mm | 545 mm | 1020 mm | 1480 mm |
5-El.-50-Ohm-Yagi (1,50m-Boom)
medium bandwidth and high gain, data for 144-145MHz (SSB/CW) and 144-145MHz (FM)
1,50m-Boom 8,5dBd Gain F/R >20dB SWR<1,2 at 144-145MHz Stacking distance 2,10m |
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The 5-El.-Yagi with a folded dipole and a half-wave balun, available at KONNI |
The measured SWR-data: SWR 144-145 MHz < 1,1!
Elementpositions and Elementlengths, the Radiator has the same diameter as the parasitic elements For FM-operation (145-146MHz) make each element 8mm shorter (reflector only 4 mm)
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| Diameter | Ref | Rad | Dir 1 | Dir 2 | Dir 3 |
| 8 mm | 1030 mm | 976 mm | 926 mm | 919 mm | 909 mm |
| 6 mm | 1032 mm | 984 mm | 935 mm | 926 mm | 916 mm |
| 4 mm | 1034 mm | 992 mm | 946 mm | 937 mm | 924 mm |
| Position | 0 mm | 280 mm | 415 mm | 950 mm | 1480 mm |
Feeding of the Yagi with the 50-Ohm-coax-choke:
