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

The new EME-group of 

Simon, ZL4PLM

More informations on his webpage

www.zl4plm.com

The EME-Group of

 Mario, EB5HRZ

 

4x12.-El.-144 MHz

4x8-El.-144 MHz

4x23-El.-432 MHz

 

A very good solution ist the mounting of 4x8-El.-Yagi vertical in front of the stacking harness. So Mario needs no glassfibre for the boom and has an x-pol antenna!

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

The 12-El.-28-Ohm-Yagi built by Dimitris, SW6IED. Click on pictures to enlarge!

 

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 mm 405 mm 680 mm 1270 mm 1965 mm 2790 mm 3675 mm 4555 mm 5470 mm 6365 mm 7255 mm 7960 mm
10 mm 1006 mm 965 mm 943 mm 911 mm 893 mm 879 mm 870 mm 863 mm 858 mm 857 mm 869 mm 867 mm
3/8" 1008 mm 968 mm 946 mm 914 mm 895 mm 882 mm 871 mm 864 mm 860 mm 859 mm 870 mm 868 mm
8 mm 1010 mm 969 mm 950 mm 920 mm 901 mm 887 mm 878 mm 871 mm 866 mm 865 mm 876 mm 871 mm
6 mm 1012 mm 973 mm 958 mm 930 mm 911 mm 897 mm 888 mm 881 mm 876 mm 875 mm 886 mm 881 mm

For building a lightweight construction I have calculated with thin elements (-0,12 dB):

  Ref Rad (4 mm) D 1 D 2 D 3 D 4  D 5 D 6 D 7 D 8 D 9 D 10
Pos 0 mm 405 mm 680 mm 1270 mm 1965 mm 2790 mm 3675 mm 4555 mm 5470 mm 6365 mm 7255 mm 7960 mm
4 mm 1016 mm 991 mm 962 mm 937 mm 919 mm 906 mm 898 mm 892 mm 887 mm 886 mm 896 mm 892 mm
3,2 mm 1018 mm 990 mm 965 mm 941 mm 924 mm 912 mm 903 mm 897 mm 893 mm 892 mm 902 mm 897 mm
3 mm 1018 mm 990 mm 966 mm 942 mm 925 mm 913 mm 905 mm 899 mm 894 mm 893 mm 903 mm 899 mm

 

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=-1,49

vertical stacking 4,00 m, horizontal stacking 4,21 m

3dB hor = 13,      3dB ver = 12,6