Construction   2-Element (0,15m)    3-Element (0,80m 4-Element (1,00m)
4-Element (1,25m) 4-Element (1,50m)   5-Element (2,00m) 6-Element (2,60m)

3-Element-12.5-Ohm-2m-Yagis for SSB/CW 

Boom 0,80 m an 0,50 m (short version see down)

Gain 7,2 dBd, F/B > 10 dB, stacking distance 1,70 m

Yagi in portable use, built by Victor,EA1GAR

Here the 4x3-Element group

by  Theo, PA1KT

On his QRZ.COM-Page he has a comparison between the 4x3-El. and a 11-El-LFA-Yagi in an interesting video:

LINK

 

Left: The 8x3-El.-Contest-Group of  5P5T

 

Data for single Yagi and vertical stacking

  Gain 3dB hor 3dB ver
1x3-El 7,2dBd 57,2 79,6
2x3-El 10,4dBd 57,4 33,0
4x3-El 13,4dBd 58,4 16,0

Element-Positions

Ref Rad Dir
0 mm 310 mm 800 mm

Element-Lengths

Diameter Ref Rad (10 mm) Dir
4 mm 1018 mm 945 mm  937 mm
6 mm 1016 mm 945 mm  927 mm
8 mm 1014 mm 944 mm  920 mm

Plots at 144,3MHz, gain without stacking losses

Single Yagi, hor. pattern, 0 dB = 7,26 dBd

Single Yagi, vert. pattern, 0 dB = 7,26 dBd

2 x 3-El.-Yagi, ver pattern, 0 dB =10,44 dBd,

4 x 3 El.-Yagi, vertical pattern, 0 dB = 13,4 dBd

3-Element-12.5-Ohm-2m-Yagi for SSB/CW (short)

 

Extreme high F/B and good pattern

Gain 5,4 dBd     F/B > 35 dB

 

Feeding with a coax impedance choke

 

Feeding with an impedance choke, made of 2x42 cm Aircell-5.

The max. power is 750 Watts SSB/CW

Element-Positions and Element Lengths

The SSB-Version is for 144-145 MHz, the FM-Version for 145-146 MHz

 

Reflector

Radiator

Director

Position

0 mm

125 mm

480 mm

 

SSB

Length 4 mm

1044 mm

994 mm

919 mm

Length 6 mm

1042 mm

987 mm

906 mm

Length 8 mm

1040 mm

982 mm

894 mm

 

FM

Length 4 mm

1036 mm

985 mm

912 mm

Length 6 mm

1035 mm

988 mm

898 mm

Length 8 mm

1032 mm

973 mm

882 mm