60 Converter Output Frequency, kc 60 40 20 0 20 40 Converter Input (V), Volts 60 80 Figure 2.7 Output frequency versus input voltage for typical HFC. Channel 1 to incorporate the actual gate times in the telemetered signal. This signal also went to the tape recorder to initiate its timing sequence and to the Project 1.10 equipment to provide them with a zero-time mark. To accomplish the gamma-ray measurement, the Cal detector output was integrated in an RC circuit with a time constant long compared to the prompt-gamma-ray pulse and the resulting voltage used to actuate a peak-measuring circuit. The input to the normally open peak-measuring circuit was gated off at 10 usec after gamma-ray arrival by a pulse generated by the gamma-ray pulse itself, so that the voltage held in the peak-measuring circuit was the value of the integrated detector current at 10 usec. The negative output from the peak measuring circuit controlled a converter set to free run at 30 ke such that ~ 22