A versatile and inexpensive electronic system for a high resolution NMR spectrometer

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Abstract
The complete electronic system of a frequency‐sweep 240 MHz NMR spectrometer working with a superconducting magnet is described. Full circuit and construction details are given for the rf sideband generator, pretuned coaxial cavity, af aperiodic synchronous detector, digital frequency synthesizer as well as a phase‐coherent, variable‐frequency, time‐sharing pulse generator. This system, with multichannel irradiation possibilities uses extensively standard integrated logic circuits and can be inexpensively built by any laboratory engaged in NMR research.