PERFORMANCE MEASUREMENTS ON THE AN/TRM7(XA-1) SERIAL NUMBER 1, FIELD-STRENGTH METER
Abstract
The Radio Field Intensity Meter AN/TRM7(XA-1) has been technically evaluated and compared with the T-A/NF105. The frequency range of the tests was 140 kc to 25 Mc/s. Performance measurements were conducted with the AN/TRM7(XA-1) to determine the accuracy of the indicator circuitry and its abil ity to furnish realistic data on radiated radio frequency fields. These tests show the accuracy to be =5% for CW and sine wave signals within a closed circuit. The AN/TRM7(XA-1) contains two calibration sources, namely the impulse generator and the continuously tunable sine wave generator. These methods of calibration are adequate for average use. Operational limits are determined by the frequency and repetition rate of the signal to be measured. This can be a source of error perhaps. It is suggested that calibration charts be utilized to evaluate such sources of errors. Variation in receiver gain with changes in line voltage, long and short term, was found to be less than 1%. Antenna transfer characteristics were found to be within 0.3db at 5Mc/s and within 0.5db from 5 to 24 Mc/s. Comparison of the AN/TRM7(XA-1) and the T-A/NF105 indicated that differences in the measurement of field strength were generally less than 1%. The AN/TRM-7(XA-1) performance measurements met all of the require ments specified in MIL-I- 6181D.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 07, 1962
- Accession Number
- AD0403415
Entities
People
- A. H. Dove
Organizations
- National Institute of Standards and Technology