Abstract
Measurements of mean carrier frequency, periods, and frequency ratio using commercial electronic frequency counters (EFC) suffer from an additional error which depends on the offduty ratio and appears when the measuring time is longer than the rf pulse duration [i]. As shown in [2-4], this error can be eliminated by taking the measurements not continuously but portionwise only when the rf pulse is present. The block diagram of an EFC in which this additional error is eliminated in the carrier frequency measurement mode is shown in Fig. la. The EFC is composed of a limiter amplifier LA for converting the input signal into a pulse train, a pulse counter PC, counter and divider selectors CS and DS, a reference pulse generator RG, timing divider TD, and strobe pulse generator SG.
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