Electronics > RF, Microwave, Ham Radio
Experimenting with waveguides using the LiteVNA
joeqsmith:
Setup ready for running samples.
joeqsmith:
Another basic video describing EPR/ESR.
joeqsmith:
Much better video on quantum mechanical spin:
joeqsmith:
Attempting to run a different chemical tonight.
This little home project has once again shown me just how ignorant I am. Planning to put some sort of video out, but rather from a physicist's point of view, it would be from a EE who knows jack all about the subject. :-DD
joeqsmith:
The frequency drift needed to be addressed. I modified one of my original LiteVNAs to include a external clock reference input. I was planning to modify the latest revision of the LiteVNA I have but it turned out there appears to be a problem that causes 50Hz dips in the frequency. I repeated the frequency stability test using my third LiteVNA which is also the older revision of hardware and it also does not exhibit the problem. While I have raised the issue, I doubt it will be addressed so future tests will be based on the older hardware.
Shown is the modified VNA. I pulled the oscillator. Added an SMA with a TVS and termination. The LiteVNA requires the clock to be 24.0MHz. For now, I am just using my RF generator to derive it. With everything now locked to the GPS, we can measure the resonance of the cavity over an extended time.
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