The report contains the findings in the second of a two-part study on the degradation of VHF and UHF land mobile radio reception. Observations for this study on base station reception were made at 37.5 MHz, 88 MHz, 153 MHz, 459 MHz and 956 MHz. The study concludes that when a land mobile base station antenna is approximately 50 feet high and located 300 feet or less from a heavily traveled road, ignition radiation was the main cause of interference at 37.5 and 88 MHz. At 459 and 956 MHz, multipath interference predominated. As the base station antenna was moved away from traffic, degradation due to ignition interference decreased while multipath interference was unaffected. The degradation of reception in the land mobile radio services from the ignition systems of motor vehicles and the additional adverse effect of super-noisy vehicles suggests that either the present voluntary SAE J551(a) radiation standard is inadequate or a considerable number of motor vehicles do not comply with the standard.
Degradation of Base Station Radio Reception at UHF and VHF: Due to the Effects of Automobile Ignition Systems and Multipath Propagation
1975
58 pages
Report
Keine Angabe
Englisch
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