Measurement of RF fields associated with ISM equipment as it relates to aeronautical services
Abstract
Described are the RF field measurements of four Industrial, Scientific and medical devices to characterize the fundamental and 4th harmonic radiation from these devices according to FCC Part 18 and CISPR Publication 11 and 11A. The effects of the 4th harmonic radiation is considered with respect to instrument landing systems (ILS) localizer receiver susceptability. The testing was performed at an open field test site with measurements made on the ground and at elevation angles from 45 to 75 degrees. Additionally, an aircraft equipped with calibrated antennas was flown over the ISM device to determine the RF fields radiated overhead at the 4th harmonic of the fundamental operating frequency. Results indicate that RF fields (at ILS localizer frequencies) of 20 to harmonic emissions in the vicinity of ISM equipment.
- Publication:
-
Final Report Ohio Univ
- Pub Date:
- May 1985
- Bibcode:
- 1985oua..reptQ....N
- Keywords:
-
- Electric Field Strength;
- Harmonic Radiation;
- Radiation Distribution;
- Radiation Measurement;
- Radio Frequency Interference;
- Electric Fields;
- Instrument Landing Systems;
- Operating Costs;
- Radio Frequencies;
- Radio Waves;
- Communications and Radar