| Construction details | 9-Ele.-28-Ohm | 10-Ele-28-Ohm | 11-Ele-28-Ohm |
| 12-Ele.-28-Ohm | 14-Ele.-28-Ohm | 17-Ele.-28-Ohm | 19-Ele.-28-Ohm |
12-Ele.-28-Ohm-DK7ZB-Yagi (8,00m Boom)
one of the most built Yagis in DK7ZB-design, very good data (see VE7BQH-List)
updated with new version DK7ZB-12 opt (10-July-2007)
Link to a site with a lot of details about this Yagi: DL2JAS
You can win a price (a box with 20 bottles of good german beer) if you can construct a comparable 8m-Boom-Longyagi with pure 50Ohm impedance (Gain 14,28dBd, 2MHz bandwidth for SWR <1,5 and such a clear pattern) for the VE7BQH-list!
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4x12-Ele-EME- Yagi-Group built by Frank, DH7FB Each Yagi with a gain of 14,2dBd, Gain of the group 20dBd, G/T -1,60 Details by DH7FB with remote control by Internet
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4x12-Ele.-28-Ohm-Yagi at DK0TU (Technical University of Berlin) Tnx photo to Arno, DL7WC |
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The 12-El.-Yagi built by Adam, 9A4QV |
4x12-El.-Yagi by Ludek, OK2UZL |
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Yagi built by Robert, SP8RHP (KO10FF) He reports SWR 1.1 from 144,0-144,8MHz
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EME on 144 and 432MHz:
4x12-Ele.-28-Ohm-Yagi by Karsten, DL2LAH
4x16-El.-28-Ohm-Yagis for 432MHz |
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New design updated 10-July-2007 with YO 7 and EZNEC+5 for more bandwidth and slightly more gain. It is highly recommended to use 8mm- or 10mm-elements for best gain, bandwidth and pattern! The radiator has 12mm for all types. |
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Lengths and positions of the elements
The given length of the radiator element is from tip to tip, including 10mm spacing for the insulated part.
| Ref | Rad | D 1 | D 2 | D 3 | D 4 | D 5 | D 6 | D 7 | D 8 | D 9 | D 10 | |
| Pos | 0 | 405 | 680 | 1270 | 1965 | 2790 | 3675 | 4555 | 5470 | 6365 | 7255 | 7960 |
| 10mm | 1006 | 965 | 943 | 911 | 893 | 879 | 870 | 863 | 858 | 857 | 869 | 867 |
| 8mm | 1010 | 969 | 950 | 920 | 901 | 887 | 878 | 871 | 866 | 865 | 876 | 871 |
| 6mm | 1012 | 973 | 958 | 930 | 911 | 897 | 888 | 881 | 876 | 875 | 886 | 881 |
Old design: Element-lengths ( Rad 12mm) in mm
| Ref | Rad | D 1 | D 2 | D 3 | D 4 | D 5 | D 6 | D 7 | D 8 | D 9 | D 10 | |
| 10mm | 1010 | 972 | 942 | 915 | 897 | 882 | 872 | 866 | 860 | 860 | 871 | 865 |
| 8mm | 1013 | 972 | 948 | 922 | 904 | 890 | 880 | 874 | 868 | 868 | 879 | 873 |
| 6mm | 1016 | 972 | 954 | 929 | 912 | 898 | 889 | 884 | 878 | 878 | 888 | 882 |
| 4mm | 1019 | 972 | 962 | 938 | 922 | 909 | 900 | 895 | 889 | 889 | 899 | 894 |
Old design: Element-positions in mm
| Ref | Rad | D 1 | D 2 | D 3 | D 4 | D 5 | D 6 | D 7 | D 8 | D 9 | D 10 |
| 0mm | 405 | 680 | 1275 | 1970 | 2800 | 3685 | 4570 | 5485 | 6385 | 7275 | 7980 |
Element-current-profile
4 Yagis stacked in H-configuration, Gain 20dBd, G/T=-1,6
vertical stacking 4,34m, horizontal stacking 4,12m
3dB hor = 13°, 3dB ver = 12,6°
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