Motor Vehicle Ignition Radiation With Respect to the SAE Standard J551c

You are here: Homepage > Search

Motor Vehicle Ignition Radiation With Respect to the SAE Standard J551c

F. Lucia / M. Liebman / D. Desrosiers

The purpose of the project was to determine on an individual basis the percentage of vehicles in a large sample size that exceeded the Society of Automotive Engineers (SAE) J551(c) standard, and which vehicles caused degradation to land mobile reception. Ten thousand vehicles were measured at each test frequency, 50MHz and 153 Mhz, as each vehicle passed the measurement site located on a single-land ramp connecting two interstate highways. Data was obtained to answer the following questions about each vehicle. 1. Was the vehicle's radiation above the industry's voluntary limit. 2. Was the signal quality degraded by the vehicle's radiation. 3. How long was the degradation present. 4. What was the make and type of the vehicle. The percentage of vehicles exceeding the SAE radiation limit was 3.6% at 50 MHz and 2.6% at 153 MHz. All of these vehicles caused degradation of at least one quality grade to land mobile reception based on our subjective grading scale. Additionally, 16.3% of the vehicles at 50 MHz and 8.0% of the vehicles at 153 MHz, caused degradation of one quality grade or more even though their radiation was below the SAE limit.