Construction Details

2-El.-12,5-Ohm (0,40 m)   

2-El.-28-Ohm (0,60 m)

3-El.-12,5-Ohm (1,90+2,20 m) new

3-El.-28-Ohm (1,90 m)

3-El.-28-Ohm (2,50 m)

4-El-12,5-Ohm (2,90 m)

4-El-12,5-Ohm (3,60 + 4,00 m)

5-El.-28-Ohm (4,50 m)

5-El-12,5-Ohm (6,00 m)

5-El-18-Ohm (6,00 m)

6-El.-28-Ohm (7,20 m)

7-El.-28+50Ohm (9,20+7,75 m) 8-El.-28-Ohm (12,30 m) 9-El.-28-Ohm (14,00 m)
4-El-28+50-Ohm (2,20 m) 5-El-50-Ohm (4,30 m) new 6-El-50-Ohm (6m+7,20 m) new

9-Element-28-Ohm-Yagi with 14m-Boom

Short data: Gain 12.34 dBd (14.49dBi), F/B 34dB, bandwidth 1MHz (49.4-50.45 MHz) at SWR < 1.5

Excellent pattern, bandwidth and gain. I used this Yagi for 2 years with very good results.

These data will not be reached by any comparable known Yagi, the first choice for 6m-EME and severe DX!

 

The 4x9-El.-28-Ohm-Yagi group

of Jarda, OK1RD

The Yagi built by Roman, SP2DDX

http://klub.chip.pl/sp2ddx

The 9-Ele.-Yagi combined with a 4-El.-Stepp-IR

A real big gun!!

Antenna built by

Jacques,

F6BKI

Jacques has redesigned the Yagi for 14mm-elements.

How the antenna is working you see on the HP-Analyzer-Plot left.

For a better picture click with your mouse!

 

Updated dimensions for better data July 2008. All elements 12mm diameter without tapering

Element Element-Position (mm) Element-Length (mm)
Ref 0 2960
Rad 1000 2882
D 1 1655 2794
D 2 3155 2720
D 3 5075 2660
D 4 7395 2620
D 5 9790 2600
D 6 12170 2640
D 7 14000 2580

Match with 2xLambda/4 75-Ohm-coax-choke in parallel to a grounded socket, feedpoint impedance 50Ohm.