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Antenna No 59

 

6 element Yagi for 4m

 

Credits to DK7ZB.  I opted for a 6 element Yagi with a 4.30m boom length from Martin's excellent site. 

 

The elements are 10x1mm and the boom measures 25x25x2.5mm and is self supporting.  The design is for 50 Ohms impedance so the antenna only requires a coax RFC (L/4*VF) at the feedpoint.  I used an ABS project box measuring 80x82x55mm and 10mm PP saddle clamps to hold the elements. 

 

 

Element

Position (mm)

Length (mm)

Reflector

0

2100

Dipole

570

2054

Director 1

850

1996

Director 2

1725

1947

Director 3

3050

1935

DIrector 4

4265

1864


 

 

I am currently using this antenna in vertical polarisation for 4m FM contacts.

 

 

The 6 element Yagi assembled on the grass on a sunny day.  1m reference length.

Green PP saddle clamps are used to hold the elements.

PE support to mount the Yagi on a fiber mast for testing.


 

 


 

 

Antenna measurements September 2014.

 

 

Antenna SWR curve [this design] is quite critical.   Here in horizontal polarisation.

Antenna in band SWR is acceptable on the FM frequency used.


 

 

The above measurements were of my first test of this Yagi using exact dimensions supplied by the author.  Lowest SWR was 1.2 at around 70.570MHz so the antenna was perhaps slightly "short", however, I decided to leave it "as is" given that an SWR of 1.26 is acceptable on my local 4m FM frequency.

 

 


 

 

Below some pictures of my current set up:  the new 4m 6 element Yagi is in front, behind a 2m 6 element Yagi and a 4m 4 element Yagi for comparative A/B testing.  At the top are dipoles for 4m and 6m.

 

The new 6 element Yagi signifies a 3dB increase over the 4 element Yagi, however, the antenna is twice as long and almost three times as heavy ...

 

 

Latest antennas for 6m, 4m and 2m FM contacts.

The 4m and 2m Yagis in VP.


 

 


 


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