| FURNISHED ITEMS AND QUANTITY | FREQUENCY METER FR-6/U 1,CASE METER CY- 1501/U 1,CORD CG-409/U 1,FREQUENCY DATA BOOK 1 |
| ENTRY DATE | 70-01-09 |
| FEATURES PROVIDED | INTERNAL FREQUENCY CALIBRATING CRYSTAL |
| FREQUENCY RATING | 1.0 KILOHERTZ MINIMUM AND 50.0 KILOHERTZ MAXIMUM |
| FREQUENCY RESPONSE RANGE | +100.0 TO 500.0 MEGAHERTZ |
| FUNCTIONAL CLASSIFICATION | AA-6.3 |
| FUNCTIONAL DESCRIPTION | PORTABLE INSTRUMENT CAPABLE OF MEASURING ANY FREQUENCY WITHIN THE RANGE OF 100 TO 500 MHZ W/ACCURACY OF PORM 0.001 PCT. USES HETERODYNE PRINCIPLE FOR DETERMINING FREQUENCY OF AN UNKNOWN SIGNAL; MEASUREMENT IS ACCOMPLISHED BY HETERDYNING A KNOWN SIGNAL FROM THE TEST INSTRUMENT AGAINST THE UNKNOWN SIGNAL. CHECK POINTS ARE USED TO CALIBRATE THE INSTRUMENT THROUGHOUT ITS OPERATING RANGE. USED TO TEST THE FOLLOWING AVIONICS SYSTEMS: AN/AKT-18; AN/ARA-31; AN/ARC-54; AN/ARC-60; AN/ARC-73; AN/ARN-30(); AN/CRD-4; AN/TRC-68; AN/URR-35C; R-508/ARC; R-509/ARC,AND T-366()/ARC |
| OVERALL HEIGHT | 12.500 INCHES NOMINAL |
| OVERALL LENGTH | 19.000 INCHES NOMINAL |
| OVERALL WIDTH | 17.375 INCHES NOMINAL |
| MATERIAL | ALUMINUM |
| PHASE | SINGLE |
| REFERENCE DATA AND LITERATURE | DEPT OF ARMY PUBLICATIONS: TM11-5096 W/CHANGES 1 AND 2,OCT 55; TM11-6625-312-12P W/CHANGE 1,JUL 59; TM11-6625-312-35P W/CHANGE 2,JUL 59; TB11-6625-312-35/1 |
| TYPE/MODEL DESIGNATION | AN/URM-81 |