TM 11-6625-486-14&P
FUNCTIONING OF EQUIPMENT
fundamentals). The fundamental frequency is read
5-1. General
directly from a calibrated filmstrip, and the appropriate
harmonic is obtained by a multiplication of the film
Frequency Meter AN/USM/159 (*), which is a
transistorized heterodyne type, covers three frequency
Signal paths are shown in the block diagram (fig. 5-1)
ranges: 125 kHz to 2.5 MHz (125 kHz to 250 kHz on
and are described in a through h below. For complete
fundamentals), 2.5 to 65 MHz (2.5 to 5.0 MHz on
circuit details, refer to the overall schematic diagram.
fundamentals), and 65 to 1,000 MHz (65 to 130 MHz on
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