TM 11-6625-486-14&P
Section II. DESCRIPTION AND DATA
or unmodulated signals for testing and calibrating radio
equipment. A system of checkpoints is provided to
Frequency Meters AN/USM-159, AN/USM159A, and
check the calibration of the instrument throughout its
AN/USM-159B (fig. 1-1) are precision instruments used
operating range.
to measure radiofrequencies (rf) in the range from 125
kilohertz (kHz) to 1,000 megahertz (MHz). They can
also be used as signal generators to provide modulated
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