Please read the White Paper Copyright Notice

Download
WHP079 420 Kb

BBC R&D White Paper WHP079

Calculation of the field strength of an interfering signal to produce 3 dB reduction of 46 dB4W s/n ratio for a 15 kHz AF bandwidth FM link
P.N. Moss

Keywords
frequency modulation, interfering signals, EN55103-1

Abstract
The aim of this Tech. Mem. is to produce an expression for the field strength of an interfering signal which provides a 3 dB loss of signal to noise ratio in an FM channel delivering 46 dB4W in the absence of interference.

The FM channel is taken as having 75 kHz peak programme deviation and 15 kHz audio bandwidth. The receiver aerial is assumed to be a /2 dipole for the purpose of the calculation.

This document was originally published by BBC D&ED as internal Technical Memorandum R.1151(91).