Electronics > RF, Microwave, Ham Radio

NanoVNA Custom Software

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metrologist:
Thanks Joe

joeqsmith:
Shown is the Vivaldi I attempted to copy from our friend who was experimenting with RADAR.   There is also a poorly constructed dipole along with a fresh can of pork and beans.  Used the Dremel tool to cut off the bottom of the can and removed the ring from the top of the original can.  After that, it was easy enough to solder together.  I moved the mounting bracket to center the antenna. 

The dipole sort of radiates like we would expect. 

joeqsmith:
The Vivaldi compared with the dipole. 

joeqsmith:
Showing the new bean can antenna pointing downward compared with the Vivaldi and dipole.  Stubs had to be retuned after extending the waveguide.

joeqsmith:
Showing the SWR after extending the waveguide and adjusting the stubs.   It seems to improve the side lobes.   
 

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