ITU-R REPORT BS.946-1 PDF

Introduction

In order to ensure effective planning of sound·broadcasting services in the frequency range 87.5-108 MHz, it may be necessary to take into account certain constraints on the use of frequencies in order to avoid interference to other sound-broadcast transmissions within this band and to ensure compatibility with television broadcasts in the frequency ranges 47-68 MHz and 174-230 MHz.

This Report identifies the various possible interference mechanisms resulting from the technical limitations of receiver design, and also those due to constraints resulting from the transmission of several broadcast programmes from the same site.

A listing of the main interference mechanisms generated in the radio receiver is provided in § 2, and § 3 specifies those which are of importance in planning. No account is taken of interference resulting from radiation of harmonics and intermodulation products at transmitter sites, on the assumption that the broadcaster can take the necessary precautions to reduce such spurious radiation to acceptable levels.