4-Element-15-m-Yagi with 28 Ohm

link to web page DK7ZB

Boom 5,00 m

The Yagi built by 

Pavel, OK1DX

Antenna built by

 Attila,   DL1NUX

 

Modified version with a folded dipole, built by

  François, HB9BLF

Link to the page of HB9WW with an interesting description by HB9BLF

(PDF-File with pictures in French language)

DOWNLOAD

Yagi built by Andy,

M0CTR

 

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 YO7.2 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!

 Elements of the 4-El.-15m-28Ohm-Yagi, lengths for one element-half: 

 

25x2mm

20x1,5mm

16x1mm

Position

Ref

1,00m

1,00m

1,625m

0m

Rad

1,00m

1,00m

1,515m

1,18m

Dir 1

1,00m

1,00m

1,39m

2,23m

Dir 2

1,00m

1,00m

1,19m

4,98m

  Azimuth-diagram (horizontal pattern):

Elevation-diagram (vertical pattern):

Gain, SWR, F/R and Z versus frequency: