Details for all Yagis 1-El.-50Ohm 2-El.-28Ohm 3-El.-28+50Ohm
4-El.-50Ohm (0,76m) 4-El.-28Ohm (0,76m) 4-El.-28Ohm (0,82m) 4-Ele.-28-Ohm (1,00m)
5-Ele.-28+50-Ohm (1,50m)  5-Ele.-28-Ohm (1,80m) 5-(6)-Ele.-28-(50)-Ohm (2,00m) 6-El.-28-Ohm (2,40m)
6-El.-28-Ohm (2,60m) 7-Ele.-28+50Ohm (3,00m) 7-Ele.-28-Ohm (3,30m) 8-Ele.-28-Ohm (4,35m)

7-Element-Yagis 28Ohm+50Ohm, 3.00m-Boom

7-Element-Yagi 28Ohm, 3.00m-Boom

 

The picture right shows the 2x7-El.-group of

 Patrick, TK5EP

 

Link to the page of TK5EP

On his page (in english language a lot of informations and pictures)

This Yagi has slightly different dimensions with a gain of 10,6dBd, but greater bandwith. All details on the page of TK5EP.

 

      10,7dBd  Gain     

  F/B >30dB at 144,3MHz

3,00m-Boom, very clear pattern 

For SSB/CW-part of the 2m-Band

Stacking distance 2,85m

The 2x7-El.-stacked by 

Knut,  DM4KL

 

In the pictures below you see the measured data for the two antennas. You see slight differences, in practise you will have such effects.

Click to enlarge!

4x7-El.-Yagi

Stacking vertical

French contest group

F5LEN

F5MBM

F5RMY

 

Details:    www.jn38.org

 

The 4x7-El.-Group

 by 

Philippe, F1HQM

 

Elementlengths and -positions, Radiator 12mm or 10mm diameter! 

Diameter Ref Rad  D 1 D 2 D 3 D 4 D 5
10mm 1020mm 968mm (12mm) 941mm 914mm 898mm 901mm 873mm
3/8'' 1020 mm 973 (3/8'') 943 mm 916 mm 900 mm 903 mm 874 mm
8mm 1022mm 972mm (10mm) 949mm 922mm 906mm 909mm 881mm
6mm 1024mm 974mm (10mm) 956mm 930mm 914mm 917mm 889mm
Position 0mm 275mm 465mm 920mm 1605mm 2360mm 2980mm

Patterns for 144,3MHz, above 145MHz increase the back lobes and the antenna has 0,1dB more gain

7-Element-Yagi 50Ohm, 3.00m-Boom

Narrowband-Versions for SSB 144-145MHz or FM 145-146MHz

Feeding with the 50Ohm-caox-choke

 

Gain 10,7dBd 

   3dB-angles hor = 39,6, ver =44,8   

Stacking distance 2,85m

(for a single antenna)

 

 

 

The Photo shows the 2x7-El.-Yagi

built by Billy, PY2LCD

 

 

 

 

Lengths and Spacing of the Elements

Type Diameter Ref Rad  D 1 D 2 D 3 D 4 D 5
SSB 6 mm 1024 mm 982 mm (6 mm) 952 mm 932 mm 918 mm 923mm 894 mm
8 mm 1020 mm 974 mm (8 mm) 942 mm 925 mm 908 mm 914mm 884 mm
10 mm 1018 mm 969 mm (10 mm) 935 mm 918 mm 900 mm 906 mm 876 mm
FM 6 mm 1018 mm 975mm (6mm) 942 mm 925 mm 908 mm 913 mm 884 mm
8 mm 1014 mm 965mm (8mm) 932 mm 915 mm 898 mm 904 mm 874 mm
Position 0 mm 320 mm 460 mm 935 mm 1630 mm 2385 mm 2980 mm