A METHOD OF PREDICTING THE INTERFERENCE MARGIN FOR NON-DIRECTIONAL BEACONS
The purpose of this report is to describe a new method for determining the electric field strength produced by a Non-Directional Beacon (NDB) as a function of the important parameters involved which include distance, frequency, ground conductivity, and effective isotropic radiated power (EIRP). This method enables the determination of the coverage area within which the signal level from the NDB exceeds some critical value, usually 70 microvolts per meter (peak power). Applied to another NDB which might cause interference to the first, correcting for frequency difference to account for receiver selectivity, one can determine at any point the interference margin, (i.e., the amount by which the desired NDB signal exceeds the undesired and potentially interfering signal). This interference margin must be at least 15 dB for satisfactory operation. The scope of this report includes frequencies from 190 to 535 kHz. (Author)
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Corporate Authors:
Ohio University, Athens
3 Canterbury Drive
Athens, OH United States 45701Federal Aviation Administration
William J. Hughes Technical Center, Airport Technology Research and Development Branch
Atlantic City International Airport
Atlantic City, NJ United States 08405 -
Authors:
- Luebbers, R
- Mullins, T
- Publication Date: 1981-12
Media Info
- Pagination: 40 p.
Subject/Index Terms
- TRT Terms: Alternating current peak value; Area; Beacons; Electric fields; Electromagnetic radiation; Field strength; Interference; Isotropy; Power; Present value; Radio beacons; Signals
- Uncontrolled Terms: Conductivity; Value
- Old TRIS Terms: Area coverage; Directional; Field intensity; Ground level; Peak power
- Subject Areas: Energy; Finance;
Filing Info
- Accession Number: 00364896
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: OUEE-FAA-1-3, FAA/RD-81/84
- Contract Numbers: DTFA01-80-C-10072
- Files: NTIS, USDOT
- Created Date: Jun 30 2003 12:00AM