How to build and test an NQR spectrometer, which is similar to MRI, but uses no magnets. NQR frequencies are unique among all tested compounds, so detecting a resonance indicates a near certainty that a specific chemical is present.

Tektronix 2-series oscilloscope: https://www.tek.com/en/products/oscil... Video capture was done via VNC client

Zeeman effect shifting optical spectral lines:    • Candle flame is repelled by magnets (...  

Atomic clock calibration using Zeeman effect:    • How an Atomic Clock Really Works, Rou...  

W2AEW's RF tutorial on quarter wave transmission lines:    • #200: T/R Switch w/ PIN Diodes and Lu...  

Water deflected by electric field:    • How a liquid lens works (electrowetting)  

Litz wire only helpful between 50KHz and 1.5MHz -    • Resonant Magnet-Field Antennas Pt.4: ...  

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Q/A
Why use vacuum variable capacitors? The parallel LC circuit develops well over 1000 volts during transmit, and they are much easier to finely adjust over a large range.



I've spent quite a few hours making this work since late last year. I failed to detect a signal from urea, which burned dozens of hours. Switching to NaNO2 suddenly produced a huge signal.

NQR calculations spreadsheet - https://docs.google.com/spreadsheets/...

NQR references (many!) : https://docs.google.com/document/d/1X...