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Dual Band Yagi 6/4 meter Band



 
Dual band 6m-4m Yagi based on 6jxx6 from Sandro I0JXX.This antenna was optimized with the goal to minimize any changes in 6jxx6 impedance/lobes. The result is a 7 el on 70 MHz with a little loss of gain comparing with the other monobands of the same lenght.
If you don't have so much space on your mast, like me, a dual band antenna can be a nice solution.
I chose to separate the sources of the 2 antennas because i have two rigs attached.

 

 

 

 

 

 

 

 

 

 

 

 

 

The 4m antenna has an impedance of about 27 Ohm, so we must use a matching circuit. The easiest way is to use a quarterwave line of about 35ohm, achieved with a parallel of 2*75ohm cable. I simulated the antenna with nec2 engine and the results are very close to the real values.
Thanks to Sandro I0JXX for hardware and Pino IK0SMG for help in matchbox assembling.

 

 

 
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