scope:

This ETS is intended to specify the minimum performance and the methods of measurement of wide band audio links as specified in the scope.

This ETS 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 which may be required by a user. nor does it necessarily represent the optimum performance achievable.

This ETS applies to modulation systems operating on radio frequencies between 25 MHz - 3 GHz. Although analogue FM is at present used for the majority of wide band audio links, this ETS does not preclude any other constant carrier modulation technique, eg. GMSK or GTFM, provided that the modulation spectrum lies within a standardised spectral mask.

This ETS does not cover wide band audio links employing TDMA, frequency hopping and spread spectrum or similar forms of modulation.

This ETS does not cover radiation below 25 MHz. It is anticipated that methods of measurements and minimum standards for such emissions will be covered by specifications supporting Council Directive 89/336 EEC [3].

The ETS is based on the CEPT Recommendation T/R 20-06 [4].

EMC requirements for wide band audio links may be found in the relevant harmonized EMC ETS.

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

This ETS may be used by accredited test laboratories for type testing of the equipment. The performance of the equipment submitted for type testing should be representative for the performance of the corresponding production models.

This ETS also contains instructions for the presentation of equipment for type testing purposes.

Power limits recommended in this ETS have been chosen to allow maximum simultaneous re-usage of frequency allocations. National regulations on power output can apply up to the limits quoted below. Lower power limits should refer to I-ETS 300 422 [1]. 

The types of equipment covered by this ETS are as follows (see subclause 4.1):

- professional wide band audio links for one-way transmission;

- professional wide band audio links for two-way transmission;

- professional wide band audio links with extra facilities.