scope:

The present document covers the minimum characteristics considered necessary in order to make the best use of the available frequencies. It does not necessarily include all the characteristics that may be required by a user, nor does it necessarily represent the optimum performance achievable.

The present document applies to equipment with modulation systems operating on radio frequencies between 25 MHz and 3 GHz. Although analogue Frequency Modulation (FM) is at present used for the majority of radio microphones and other equipment covered by the present document, this specification does not preclude any other constant carrier modulation technique, e.g. Gaussian Filtered Minimum Shift Keying (GMSK) or Generalized Tamed Frequency Modulation (GTFM), provided that the modulation spectrum lies within a standardized special mask.

The present document does not apply to radio microphones or in ear monitoring equipment employing Time Division Multiple Access (TDMA), frequency hopping and spread spectrum or similar forms of modulation.

EMC requirements are covered by ETS 300 455 [8].

Additional standards or specifications may be required for equipment intended to interface to the Public Switched Telephone Network (PSTN). This facility may be submitted to regulatory conditions.

The present document may be used by accredited test laboratories for type testing of the equipment. The performance of the equipment sub mitted for type testing should be representative of the performance of the corresponding production models.

The present document contains instructions for the presentation of equipment for type testing purposes.

Power limits recommended in the present document have been chosen to allow maximum simultaneous reusage of frequency allocations. Notional regulations on power output may apply up to the limits quoted below.

NOTE: If higher power limits are required reference should be made to EST 300 454 [7] Wide band audio links, which is currently under preparation.

The types of equipment covered by the present document are as follows:

- professional hand held radio microphones;

- professional body worn radio microphones;

- in ear monitoring systems;

- consumer radio microphones;

- tour guide systems;

- aids for the handicapped.

The classes of equipment given in the present document are as follows:

- class 1 equipment would normally be considered as a category requiring an operator licence;

- class 2 equipment would be considered in some countries as not requiring an operator licence.