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The following correspondence is a report of the experimental results that have been obtained with a single-varactor-diode frequency multiplier. This circuit is a times sixteen ( x 16) single-stage varactor multiplier operating from 350 to 5600 Mc. The high efficiencies predicted theoretically for singlestage, high-order varactor multipliers are now being achieved with these practical circuits. They should have wide application in microwave systems where reliability and size are major considerations.