NCJ Number
101789
Date Published
1986
Length
37 pages
Annotation
Power gain radiation patterns of mobile antennas mounted in six different locations on a test vehicle were measured with and without lights and sirens placed on top of the roof to determine the optimum antenna placement.
Abstract
The test vehicle was a 1976 four-door sedan. The antenna locations tested were three on the roof, two on the trunk, and one on the right-front fender. Measurements were performed at frequencies representing the frequency bands of 25 to 50, 150 to 174, 400 to 512, and 806 to 866 MHz. In addition, radiation patterns of three disguised antennas operating at discrete frequencies of 40.27, 162.475, and 416.975 MHz and one slot antenna operating at 413 MHz were also measured. The report gives plots of power gain radiation patterns for each antenna location tested to show the effects of the light and siren and of improper grounding of the trunk lid. It recommends antenna mounting locations for specific frequency bands. Power gain measurement data is appended. Drawings and tables. (Author abstract modified)