scope:

This ETS specifies the minimum performance and the methods of measurement of wide band audio links.

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 and 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, e.g. Gaussian Filtered Minimum Shift Keying (GMSK) or Generalised Tamed Frequency Modulation (GTFM), provided that the modulation spectrum lies within the specified spectral mask.

This ETS does not cover wide band audio links employing Time Division Multiple Access (TDMA), frequency hopping and spread spectrum or similar forms of modulation.

This ETS does not cover radiated emissions below 25 MHz. Specifications related to Electro-Magnetic Compatibility (EMC) are contained within prETS 300 445 [3].

This ETS has been developed from CEPT Recommendation T/R 20-06 [4].

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

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.

The types of equipment covered by this ETS are as follows (see clause 4):

- 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.