A precision heterodyne frequency meter designed to measure or emit radiofrequency pulses in the range of 125 kHz to 20 MHz. Portable, stand-alone, used mainly for calibration of field radios and transmitters by direct comparison with a calibrated quartz oscillator of variable frequency of the device. Frequency readings are provided by a calibration book. It contains a 1 MHz quartz generator and a variable frequency generator operating in two switching ranges: from 125 to 250 kHz and from 2 to 4 MHz. The 2nd, 4th and 8th harmonics of the low frequency range were used to cover from 250 kHz to 2 MHz, and the 2nd, 4th and 5th harmonics of the high frequency range were used to cover from 4 MHz to 20 MHz.
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