ETSI - EN 301 840-1
Electromagnetic Compatibility and Radio Spectrum Matters (ERM); Digital Radio Microphones Operating in the CEPT Harmonized Band 1 785 MHz to 1 800 MHz; Part 1: Technical Characteristics and Methods of Measurement
|Publication Date:||1 April 2001|
he 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 digital equipment operating on radio frequencies between 1 785 MHz and 1 800 MHz. The present document does not preclude any digital FDMA modulation technique, provided that the modulation spectrum lies within the standardized spectral mask.
Analogue Frequency Modulation (FM) is at present used for the majority of radio microphones and other similar equipment and is not within the scope of this standard. 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.
Electromagnetic compatibility (EMC) requirements are covered by EN 301 489-9 .
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 testing of the equipment. The performance of the equipment submitted for testing should be representative of the performance of the corresponding production models.
The present document contains instructions for the presentation of equipment for testing purposes.
Power limits recommended in the present document have been chosen to allow maximum simultaneous reusage of frequency allocations. National regulations on power output may apply up to the limits quoted below.
NOTE: For higher power equipment reference should be made to ETS 300 454  Wide band audio links.
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