Circuit for a Radio-Frequency Spectrometer

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Abstract
A circuit is described for amplitude stabilization of a regenerative detector for use in nuclear magnetic resonance experiments. A remotely located two‐stage dc amplifier converts variations in oscillator grid leak voltage into compensating changes in plate supply potential. The stabilizer circuit adds little stray capacity and does not appreciably affect the oscillator design. The level of oscillation is adjustable from zero to approximately 0.3 volt peak rf signal at the detector grid. Once set, it remains essentially constant over the tuning range (4.8 to 6.3 Mc/sec). A noise figure of 2 or better is obtained. Circuit parameters for the regenerative detector and the stabilizer are given.

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