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-Yagi for the 2m-Band with the 28-Ohm-DK7ZB-Match

Version 1: 144-146MHz broadband

Version 2: 144-145 MHz for SSB/CW use

Version 3: 144-144,8 MHz for EME/SSB/CW use

This antenna (Version 1) was described in the issue 2/2000 of the magazine "FUNKAMATEUR" , report "Kurze Yagis für das 2m-Band in bewährter 28-Ohm-Technik".

Short data: 11dBd gain, boomlength 3,30m, very good pattern. For the match see: DK7ZB-Match

At the webpage "DOWNLOAD"  you can load the report as PDF-File (german language!).      

4x7-El.-28Ohm-

Yagi-group for EME

by 

Bernd,

DL7HR

 

JN58PF

      

Further details and pictures can be found on the  homepages of

 

DC6GF  

and

    DF8GH

The group right is built by

  Hans, DL9MCC

Elementlengths and -positions:

Version 1 (broadband)

Table of Elements with 4-10mm Diameter

The radiator has always a diameter of 10mm!

 

 El.-Diameter

 4mm 6mm 8mm 10mm El.-Pos.
Reflector 1019mm 1016mm 1014mm 1011mm 0mm
Radiator 978mm 978mm 978mm 978mm 360mm
Director 1 959mm 951mm 945mm 940mm 600mm
Director 2 933mm 924mm 916mm 909mm 1145mm
Director 3 916mm 906mm 898mm 891mm 1820mm
Director 4 915mm 905mm 897mm 890mm 2625mm
Director 5 904mm 894mm 885mm 877mm 3245mm

Elements are mounted insulated above the boom with polyamid clamps for TV-Yagis (Konni)

The screw in the center of the element has no influence to the length of the elements and is connected to the boom!

Gain, SWR, Front/Rear and Feedpoint- Impedance

Best F/R in the CW/SSB-part of the 2m-Band

Version 2: 144-145 MHz for SSB/CW use

This version is for SSB/CW use, specially for stacking to groups (2x or 4x) with better gain at 144,3 MHz.

Elementpositions and -lengths: Radiator 12mm, parasitic elements 10mm, 8mm or 6mm, mounted with Polyamid clamps (see details for the other 2m-Yagis)

The 7-El.-Yagi

built by

Martin, OK2FKF

3x7-El.-Yagi stacked

Contest-Group PA6NL

 

Photo by Remco,

PG0A/PA3FYM

The 4x7-Element-Group built by

Ingo, DF1VH

He is using 112Ohm (4x28Ohm) folded dipoles and a lambda/4-75Ohm-cable-match

Dimensions for the 7-El.-SSB/CW-Yagi

  Ref Rad Dir 1 Dir 2 Dir 3 Dir 4 Dir 5
Position 0mm 320 mm 595 mm 1145 mm 1825 mm 2615 mm 3260 mm
Length (12 mm) 1006 mm 965 mm 931 mm 905 mm 885 mm 886 mm 876 mm
Length(10mm) 1008 mm 964 mm 939 mm 912 mm 892 mm 894 mm 884 mm
Length(8mm) 1010 mm 964 mm 945 mm 919 mm 900 mm 902 mm 886 mm
Length(6mm) 1014 mm 964 mm 952 mm 928 mm 909 mm 911 mm 896 mm

Version 3: 144-144,8 MHz for EME/SSB/CW use

This version is for EME/SSB/CW use, specially for stacking to small EME-groups (4x H-frame) with better gain at 144,1 MHz. Also for terrestrial DX in CW/SSB!

Boomlength 3,28 m

Gain 11,14 dBd and F/B 23 dB at 144,1 MHz

3-dB-hor: 38,2°    3-dB-ver: 42,6°

Dimensions for the 7-El.-EME/SSB/CW-Yagi

  Ref Rad Dir 1 Dir 2 Dir 3 Dir 4 Dir 5
Position 0mm 330mm 625mm 1150mm 1850mm 2650mm 3260mm
Length(6mm) 1020mm 972mm 946mm 926mm 914mm 914mm 916mm
Length(8mm) 1016mm 964mm 939mm 919mm 906mm 906mm 908mm