Antenna For EasySat Part-2 ( Dual Band Moxon Yagi )

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Antenna For Easy Satellites - II

Dual Band Moxon Yagi Antenna
By:- VU2COR


Pic. 1 Design of this antenna   
This antenna works very well on both the bands. As the feedpoint is given to only one part of the antenna, so there is no need to use a duplexer or a seperete radio for receiving and transmitting the signals. Making this antenna is quite simple and low cost and you can  make this in an hour or two.

I got this design from another blogger and ham LY3LP.

 

 


Material needed

  • 1" sq. wooden dowel or 1/2" pvc pipe.
  • 6 mm aluminum pipe ( I have used) OR 3 to 4 mm hard aluminum rod.
  • Coaxial Cable like RG58 and Connector as per your need.
  • Some kind of insulators that can be used as seperator 
  • Tools like Drill machine with drill bit according to the diameter of the metal you are using as the elements in the antenna.
  • Tape measurement and a marker
  • Handsaw for cutting pipe and rod 

 

 Pic.2 UHF Yagi elements inserted

Lets Make It

  • Mark the distance of each element of antenna on the boom with the help of tape measure and marker.
  • With the help of drill, make holes in the boom.
  • Measure the length of uhf yagi elements and cut them to the exact size given in the designs.
  • To make the vhf moxon cut the total length of reflector as 100.1 cm ( you can add more like 100.5 and then you can cut it during swr matching ) and two dipole of 46.6cm 
  • Insert all the uhf yagi elements in the boom first like in Pic. 3
  • Insert the reflector of moxon and bend it same from both ends same as the design. Add the L shaped driven elements of moxon antenna .
  • Add the insulated seperator between the driven element and reflector of moxon and the antenna is ready for connecting coax.   
  • You can directly solder coax if you are using driven element made of copper . As I am using aluminum pipe so I attached the coax to the driven element with the help of small screw.

Pic. 3 Coax connected and its ready

Testing 

SWR was satisfactory on both the bands and it worked well on low elevation pass also. I was able to work many stations with just 1 watt tx power. Swr adjustment can be done by changing the spacing between the reflector and the driven element of the moxon antenna or by changing the spacing between the moxon driven element and open sleeve element of uhf yagi.

Try to make one and share your experience
with me via comments or  email.




Regards
VU2COR
Satnam Singh





Comments

  1. PRISM TECHNO LED DISPLAYS, Yamunanagar25 August 2018 at 19:40

    Thanks for sharing, I have made this one

    ReplyDelete
  2. Luis Braz30 January 2022 at 20:28

    Good work. I built one with four elements to uhf. Swr is good in vhf but too high in uhf. Is don't understand why.

    ReplyDelete

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