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CEPT/ERC Recommendation ERC 54-01 E (revised September 2010) METHOD OF MEASURING THE MAXIMUM FREQUENCY DEVIATION OF FM BROADCAST EMISSIONS IN THE BAND 87.5 MHz TO 108 MHz AT MONITORING STATIONS Recommendation adopted by the Working Group Frequency Management (FM) INTRODUCTION The purpose of this Recommendation is to provide a common measurement method which will enable CEPT administrations to recognise measurement results relating to the frequency deviation of FM broadcast emissions on a mutual basis. “The European Conference of Postal and Telecommunications Administrations, considering a) that the frequencies in the VHF band 87.5-108 MHz are assigned to an increasing number of FM broadcasting stations; b) that protection ratios for the planning of broadcasting transmitter frequencies are based on a maximum frequency deviation of ±75?kHz and a maximum power of the modulation signal which does not exceed the power of a sinusoidal tone which causes a ±19?kHz frequency deviation; c) that various broadcast transmissions exceed the maximum frequency deviation and/or modulation power owing to different types of programmes, additional components of the composite signal (e.g. Radio Data System (RDS)) and audio compression; d) that the limitation of the peak frequency deviation is required to guarantee mutual protection of broadcast services (on adjacent channels) and the aeronautical radionavigation service in the frequency band above 108 MHz; e) that the monitoring of broadcast emissions is necessary to prevent transmissions from exceeding the maximum frequency deviation; f) that common measurement procedures are necessary in order to achieve mutual acceptance of measurement results by the parties concerned, e.g. frequency managers, monitoring services and broadcasters; g) that the number of broadcasting stations using additional signals as RDS and high speed data signals is increasing and these systems are highly sensitive to interference from adjacent channels. recognisi