Author Topic: Experimenting with waveguides using the LiteVNA  (Read 71404 times)

0 Members and 2 Guests are viewing this topic.

Online joeqsmithTopic starter

  • Super Contributor
  • ***
  • Posts: 12036
  • Country: us
Re: Experimenting with waveguides using the LiteVNA
« Reply #500 on: June 12, 2024, 08:54:10 pm »
Another basic video describing EPR/ESR. 
 
The following users thanked this post: croma641

Online joeqsmithTopic starter

  • Super Contributor
  • ***
  • Posts: 12036
  • Country: us
Re: Experimenting with waveguides using the LiteVNA
« Reply #501 on: June 13, 2024, 03:13:20 pm »
Much better video on quantum mechanical spin:



Online joeqsmithTopic starter

  • Super Contributor
  • ***
  • Posts: 12036
  • Country: us
Re: Experimenting with waveguides using the LiteVNA
« Reply #502 on: June 13, 2024, 03:32:19 pm »
Another good video on spin

Online joeqsmithTopic starter

  • Super Contributor
  • ***
  • Posts: 12036
  • Country: us
Re: Experimenting with waveguides using the LiteVNA
« Reply #503 on: June 21, 2024, 03:40:55 am »
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     

Online joeqsmithTopic starter

  • Super Contributor
  • ***
  • Posts: 12036
  • Country: us
Re: Experimenting with waveguides using the LiteVNA
« Reply #504 on: June 28, 2024, 02:01:24 pm »
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.   

Online joeqsmithTopic starter

  • Super Contributor
  • ***
  • Posts: 12036
  • Country: us
Re: Experimenting with waveguides using the LiteVNA
« Reply #505 on: July 11, 2024, 11:26:27 pm »
Part 5, a touch of quantum physics and demonstration of a homemade Electron Paramagnetic Resonance (EPR) spectrometer.


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf