https://tube.loping.net/videos/watch/bd8062a1-bc95-40f8-b814-0b3833af3131 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/oscilloscopes/2-series-mso Video capture was done via VNC client Zeeman effect shifting optical spectral lines: https://youtu.be/JV4Fk3VNZqs?t=74 Atomic clock calibration using Zeeman effect: https://www.youtube.com/watch?v=xTy1kY_wtsY W2AEW's RF tutorial on quarter wave transmission lines: https://www.youtube.com/watch?v=A1BAq0KxIdc Water deflected by electric field: https://youtu.be/NjLJ77IuBdM?t=468 Litz wire only helpful between 50KHz and 1.5MHz - https://youtu.be/FUCRB9UdfUg?t=2010 Support Applied Science on Patreon: https://www.patreon.com/AppliedScience 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/d/1pkWlgvEXlANemZt3DR1J5g59S7hsejbvs995Y4FRsl0/edit?usp=sharing NQR references (many!) : https://docs.google.com/document/d/1XoNUhFceH38nSjAFZoxglNiZlUzn6QMxa6CYTyAM92c/edit?usp=sharing Sun, 12 Jul 2026 13:21:29 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://tube.loping.net https://tube.loping.net/lazy-static/avatars/8a56e488-2120-4649-a417-badf5893657b.png https://tube.loping.net/videos/watch/bd8062a1-bc95-40f8-b814-0b3833af3131 All rights reserved, unless otherwise specified in the terms specified at https://tube.loping.net/about and potential licenses granted by each content's rightholder.