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-Ohm (1,50m)  5-Ele.-28-Ohm (1,80m) 5-Ele.-28-Ohm (2,00m) 6-El.-28-Ohm (2,40m)
6-El.-28-Ohm (2,60m) 7-Ele.-28-Ohm (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

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!).            

Further details and pictures can be found on the  homepages of

 

DC6GF  

 

 

    DF8GH

 

 

Elementpositions:

Ref Rad Dir 1 Dir 2 Dir 3 Dir 4 Dir 5
0mm 360mm 600mm 1145mm 1820mm 2625mm 3245mm

Version 1 (broadband)

Table of Elements with 4-10mm Diameter

The radiator has always a diameter of 10mm!

 

 El.-Diameter

 4mm 6mm 8mm 10mm
Reflector 1019mm 1016mm 1014mm 1011mm
Radiator 978mm 978mm 978mm 978mm
Director 1 959mm 951mm 945mm 940mm
Director 2 933mm 924mm 916mm 909mm
Director 3 916mm 906mm 898mm 891mm
Director 4 915mm 905mm 897mm 890mm
Director 5 904mm 894mm 885mm 877mm

Elements are mounted isolated 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)

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