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!

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

Link

 

4x12-Ele.-28-Ohm-Yagi at DK0TU

(Technical University of Berlin)

Tnx photo to Arno, DL7WC

The 12-El.-Yagi built by Adam, 9A4QV

4x12-El.-Yagi

by

Ludek,

OK2UZL

Yagi built by 

Robert, SP8RHP (KO10FF)

He reports SWR 1.1 from 144,0-144,8MHz

 

EME on 144 and 432MHz:

 

4x12-Ele.-28-Ohm-Yagi 

by Karsten,  DL2LAH

 

 4x16-El.-28-Ohm-Yagis for 432MHz

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.

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°