Details 2-El.-4m-Yagi 3-El.-4m-Yagi 4-El.-4m-Yagi (12.5+50 Ohm)
5-El.-4m-Yagi (28+50 Ohm) 6-El.-4m-Yagi 7-El.-4m-Yagi (28+50 Ohm) 9-El.-4m-Yagi

Version 1: 4-El.-12,5-Ohm-Yagi, Boom 2,57 m, Gain 8.3 dBd, F/B >25 dB

Version 2: 4-El.-50-Ohm-Yagi, Boom 2,00 m, Gain 6.4 dBd, F/B 18 dB (see below)

New by KONNI Version 3: 4-El.-50-Ohm-Yagi, Boom 1,60 m, Gain 6.1 dBd, F/B 24 dB (see below)

The Yagi Version 1 is a narrow-band, high-gain  design, do not use this antenna if others are nearby!

John, M0UKD

built this Yagi for the cumulative 70-MHz-Contest on 09-Aug-2015

more informations here:

Link

Activation 3A

 70-MHz-

meteorscatter 

by Jean-Jacques,

 ON7EQ

and 

Hans, 

ON5AEN

The 12,5-Ohm-Yagi, built by Peter, OE5MPL

The 4-El.-Yagi by

Michal, OK1VM

The Yagi built by Tomas, OK1DXD

Azimuth

Elevation

 

Element-position 

Element-length (10 mm)

Element-length (12 mm)

Reflector

0 mm

2122 mm

2120 mm

Radiator

535 mm

2006 mm

2000 mm

Director 1

1485 mm

1956 mm

1950 mm

Director 2 2555 mm 1908 mm 1898 mm

Version 2: 4-El.-50-Ohm-Yagi, Boom 2,00 m, Gain 6.4 dBd, F/B 18 dB 

Uncritical broadband design, great bandwidth

This Yagi is a scaled version of the well proved Lightweight-2-m-Yagi

 

Element-position 

Element-length (8 mm)

Element-length (10 mm)

Reflector

0 mm

2140 mm

2134 mm

Radiator

785 mm

2114 mm

2110 mm

Director 1

1065 mm

1970 mm

1960 mm

Director 2 1970 mm 1830 mm 1820 mm

Version 3: 4-El.-50-Ohm-Yagi, Boom 1,60 m, Gain 6.1 dBd, F/B 24 dB 

New DK7ZB-Yagi available by KONNI for 70 MHz!

Gain 6,1 dBd

F/B 24 dB

Great Bandwidth

For 1 MHz SWR <= 1,1!

 

Element-position 

Element-length (10 mm)

Reflector

0 mm

2148 mm

Radiator

515 mm

2118 mm

Director 1

715 mm

1974 mm

Director 2 1560 mm 1832 mm