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)

5-El.-28-Ohm-Yagi (1,50m-Boom), broadband

(another 50-Ohm-Yagi see down)

1,50m-Boom       8,3dBd  Gain       F/R >20dB      SWR<1,2 at 144-146MHz

Stacking distance 2,05m

Short data for the Yagi at the begin, in the middle part and at the end of the band

Plot with the NEC-II-reference of YO7.23 by K6STI

The meaning of the data :

Frequency, gain, F/R, radiation resistance (impedance), SWR and loss against a theoretical defined maximum- gain-Yagi with the given boomlength. Remember that this gain is only available with very low impedance and extrem low bandwidth! The red line shows the profile of the element currents.

Elementpositions and Elementlengths, Radiator always 10 mm diameter! 

Diameter Ref Rad (10mm) Dir 1 Dir 2 Dir 3
12,7 mm 1018 mm 973 (12,7 mm) 928 mm 915 mm 884 mm
10 mm 1020 mm 978 mm 935 mm 923 mm 893 mm
8 mm 1022 mm 980 mm 942 mm 930 mm 900 mm
6 mm 1024 mm 980 mm 948 mm 937 mm 907 mm
4 mm 1026 mm 980 mm 956 mm 945 mm 917 mm
Position 0 mm 315 mm 545 mm 1020 mm 1480 mm

5-El.-50-Ohm-Yagi (1,50m-Boom)

medium bandwidth and high gain, data for 144-145MHz (SSB/CW) and 144-145MHz (FM)

 

1,50m-Boom       8,5dBd  Gain       F/R >20dB      SWR<1,2 at 144-145MHz

Stacking distance 2,10m

The 5-El.-Yagi with a folded dipole and a half-wave balun, available at KONNI

The measured SWR-data:

SWR 144-145 MHz < 1,1!

Elementpositions and Elementlengths, the Radiator has the same diameter as the parasitic elements 

For FM-operation (145-146MHz) make each element  8mm shorter (reflector only 4 mm)

 

Diameter Ref Rad  Dir 1 Dir 2 Dir 3
8 mm 1030 mm 976 mm 926 mm 919 mm 909 mm
6 mm 1032 mm 984 mm 935 mm 926 mm 916 mm
4 mm 1034 mm 992 mm 946 mm 937 mm 924 mm
Position 0 mm 280 mm 415 mm 950 mm 1480 mm

Feeding of the Yagi with the 50-Ohm-coax-choke: