Highway advisory radio system design guidelines.

This report provides technical guidelines for the use of designers and planners of Highway Advisory Radio systems built in compliance with Section 90.272 of the FCC Rules and Regulations. An overview, description and background of HAR systems is given in the introduction. Possible users of HAR and a list of existing HAR installations is also included. Individual chapters are devoted to the subjects of FCC requirements and restrictions, factors affecting HAR reception, HAR system design options, HAR transmitters, monopole antennas, cable antennas, audio recorders and reproducers, telephone line interfacing, signing, audio message preparation, and HAR system costs. A design example is given using a system installed and operating in Gatlinburg, TN.