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The pyroelectric response of single‐crystal triglycine sulfate to amplitude‐modulated X‐band microwave signals was obtained for a range of modulation frequencies, modulation coefficients, and microwave power levels. A first‐order theory has been derived which corresponds reasonably well with the experimental results. Most of the departures of experiment from theory are qualitatively explicable in terms of second‐order effects involving the increase in the average temperature of the TGS sample owing to the absorption of rf energy.