The CM-77A/USM is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5985-00-080-7204, indicating validated use in U.S. government and defense logistics supply chains.
Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.
| Part Number | CM-77A/USM |
| NSN | 5985-00-080-7204 |
| CIRCUIT CONSTRUCTION TYPE | ELECTRON TUBE |
| OPERATING AC FREQUENCY IN HERTZ | 1000.0 MAXIMUM SINGLE VOLTAGE |
| FREQUENCY PER CHANNEL | 12.4 GIGAHERTZ MAXIMUM OPERATING CHANNEL |
| EXTERNAL AC OPERATING VOLTAGE IN VOLTS | 230.0 MAXIMUM SINGLE VOLTAGE |
| AVERAGE LIFE MEASUREMENT | NOT RATED |
| BASIC SHAPE STYLE | RECTANGULAR OR SQUARE |
| OPERATING AC FREQUENCY IN HERTZ | 50.0 MINIMUM SINGLE VOLTAGE |
| EXTERNAL AC OPERATING VOLTAGE IN VOLTS | 115.0 MINIMUM SINGLE VOLTAGE |
| 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 W |
| 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 GHz |