| AVERAGE LIFE MEASUREMENT | NOT RATED |
| BASIC SHAPE STYLE | RECTANGULAR OR SQUARE |
| CIRCUIT CONSTRUCTION TYPE | ELECTRON TUBE |
| ENTRY DATE | 70-12-01 |
| EXTERNAL AC OPERATING VOLTAGE IN VOLTS | 115.0 MINIMUM SINGLE VOLTAGE |
| EXTERNAL AC OPERATING VOLTAGE IN VOLTS | 230.0 MAXIMUM SINGLE VOLTAGE |
| FREQUENCY PER CHANNEL | 10.0 MEGAHERTZ MINIMUM OPERATING CHANNEL |
| FREQUENCY PER CHANNEL | 12.4 GIGAHERTZ MAXIMUM OPERATING CHANNEL |
| 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 |
| INCLOSURE TYPE | ENCASED |
| INSTALLATION DESIGN | TOP OF CABINET/COUNTER |
| OVERALL HEIGHT | 12.500 INCHES NOMINAL |
| OVERALL LENGTH | 20.750 INCHES NOMINAL |
| OVERALL WIDTH | 15.250 INCHES NOMINAL |
| OPERATING AC FREQUENCY IN HERTZ | 1000.0 MAXIMUM SINGLE VOLTAGE |
| OPERATING AC FREQUENCY IN HERTZ | 50.0 MINIMUM SINGLE VOLTAGE |
| PHASE | SINGLE |
| 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 |