NATO Stock Number
6625-00-080-7204
Sold in multiples of
1 EA
DEMIL
DEMIL/MLI
Overall Length
20.750 inches
Overall Height
12.500 inches
Overall Width
15.250 inches
Average Life Measurement
Not rated
Basic Shape Style
Rectangular or square
Identification Designator
540b-28480
Inclosure Type
Encased
Installation Design
Top of cabinet/counter
Circuit Construction Type
Electron tube
Frequency Per Channel
10.0 megahertz operating channel
Frequency Per Channel
12.4 gigahertz operating channel
Operating Ac Frequency In Hertz
1000.0 single voltage
Operating Ac Frequency In Hertz
50.0 single voltage
External Ac Operating Voltage In Volts
115.0 single voltage
External Ac Operating Voltage In Volts
230.0 single voltage
Phase
Single
Functional Classification
Aa-6.3
Functional Description
Extends frequency measurement range of an/usm-26 & an/usm-207a into microwave range; along w/ an/usm-26 or -207a can measure frequencies up to 12.4 ghz, or w/ an external mixer 1-18 ghz; can be used w/out a frequency counter to measure frequencies below 4 ghz w/in about porm 0.5 pct; frequency is determined by zero-beating the unknown signal w/ a harmonic of an extremely stable signal generated w/in & to measure cm-77a fundamental frequency on a counter; multiplying counter readout by harmonic causing the zero-beat gives input frequency; harmonic no. Is determined from previous knowledge of input frequency or by computation; zer/-beat is displayed on internal oscilloscope
Entry Date
70-12-01
Reference Data And Literature
Dept of army publications: tb9-6625-336-50, 19 nov 64; tm11-6625-493-15 w/ changes 1 & 2, 29 sep 64; tm 11-6625-493-20p; tm11-6625-493-45p, 19 oct 64
Relationship To Similar Equipment
Interchangeable w/ 6625009739267 & 6625007355167; similar to cm-77/usm
Type/model Designation
Cm-77a/usm
