Measurements of electromagnetic noise radiated from automotive ignition systems
Abstract
Measurements of the amplitude probability distributions and the average crossing rates of the electromagnetic noise radiated by automotive ignition systems were made at 30 MHz, 47 MHz, 147 MHz, 224 MHz and 445 MHz. The ignition noise from a single car and a 12 car matrix were each measured in a 10 kHz bandwidth, using a field intensity meter, a DM4, a desktop calculator, and an XY plotter. The DM4 is an instrument built by NTIA to measure amplitude probability distributions and average crossing rates. Numerical integration of the amplitude probability distributions was used to determine the rms, the average, and the average logarithm of the envelope of the measured noise.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 November 1980
 Bibcode:
 1980STIN...8125294M
 Keywords:

 Amplitude Distribution Analysis;
 Automobiles;
 Electromagnetic Noise Measurement;
 Ignition Systems;
 Electromagnetic Noise;
 Internal Combustion Engines;
 Statistical Analysis;
 Communications and Radar