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

7-Element-28-Ohm-Yagi with 9.30m-Boom

Version 2: (7-El.-50-Ohm-Yagi with 7.75m-Boom (see down)

 

Gain 10.9 dBd (13.05 dBi), F/B 30dB

Bandwidth 1MHz (49.8-50.8 MHz) at SWR < 1.5

This Yagi was built first for 2m and  and the pattern was verified by measurement. After that the Yagi was scaled for the 6m-Band. 

The 7-El.-28-Ohm-Yagi at 8Q7QQ

Special Leightweight version, built 

by  Pierre, HB9QQ

6-m-EME March 2010

The 2x7-El.-28-Ohm-Yagis stacked at GW6YB/p in the IARU-50MHz-contest in June 2009.

Antennas built by Matt, M0MAT. He reports from SWR 1.0 at 50,150 MHz (<1 W reflected power at 400 W forward) without any corrections and tuning. Built and ready....

7-El.-28-Ohm-Yagi

built by Dave,

N8OC

 

 7-El.-28-Ohm-Yagi

built by Kalle,

DF5KB

2x7-Ele stacked at

GM2T

(Photo tnx to Colin, GM0RLZ)

Yagi

by

Jaap,

PA0O

Data updated Februar 2009, all elements 12mm diameter

With a tapered 16mm/12mm-Radiator as shown at the 50-Ohm-Yagi below the length will be 2900mm!

Element

Element-position (mm)

Element-length (12mm)

Ref

0

2920

Rad

1080

2860

D1

1740

2776

D2

3250

2688

D3

5175

2648

D4 7420 2640
D5 9300 2590

Match with 2xlambda/4 75-Ohm-coax in parallel to a grounded socket, feedpoint impedance 50Ohm (DK7ZB-match)

 The element-current-profile at 50.150MHz shows the basis for the good pattern. Yagis with bad profile have many sidelobes, poor F/R and not the best gain.

7-El.-50-Ohm-Yagi with 7.75m-Boom

Broadband-Yagi

Gain 10,19 dBd (12,34 dBi)

F/B  21dB

Feeding with a 50-Ohm-coax-choke

The 7-El.-50-Ohm-Yagi

built by

Gustavo, CE4WJK

Left:

The 7-El.-50-Ohm-Yagi 

built by Jose, EA8CK

 

Down:

His mechanical solutions 

 

Element Element-Positions (mm) Element-length (10 mm) Element-length (12 mm)
Ref 0 2950 2950
Rad 835 2886 2888
D 1 1285 2770 2720
D 2 2650 2690 2680
D 3 4390 2670 2660
D 4 6170 2670 2660
D 5 7695 2590 2570

 

The current profile plotted with EZNEC +5