scope:

The present document covers the minimum characteristics considered necessary in order to avoid harmful interference and to make acceptable 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.

The present document applies to constant envelope angle modulation systems for use in the land mobile service, using the available bandwidth, operating on radio frequencies between 30 MHz and 1 GHz, with channel separations of 12,5 kHz, 20 kHz and 25 kHz, intended for data transmissions. It applies to digital and combined analogue and digital radio equipment with an internal or external antenna connector intended for the transmission of data and/or speech.

The particular type of modulation will be chosen by the manufacturer, although it is recognized that in some countries national legislation may limit the use of certain code structures/data formats.

The technical characteristics given in the present document are independent of data rate but may in practice limit the maximum data rate achievable. Future editions of the present document may be prepared to allow complex modulation methods, together with their appropriate limits, for use at higher bit rates.

In the present document different requirements are given for the different radio frequency bands, channel separations, etc. where appropriate.

In the present document, data transmission systems are defined as systems which transmit and/or receive data. The equipment comprises a transmitter and associated encoder and modulator and/or a receiver and associated demodulator and decoder.

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

- base station (equipment fitted with an antenna socket, intended for use in a fixed location);

- mobile station (equipment fitted with an antenna socket, normally used in a Vehicle or as a transportable);

- and those handportable stations:

a) fitted with an antenna socket; or

b) without an external antenna socket (integral antenna equipment), but fitted with a permanent internal or a temporary internal 50 Ω Radio Frequency (RF) connector which allows access to the transmitter output and the receiver input.

Handportable equipment without an external or internal RF connector and without the possibility of having a temporary internal 50 Ω RF connector is not covered by the present document.

Additional standards or specifications may also be required for equipment such as that intended for connection to the Public Switched Telephone Network (PSTN), or data networks.

Channel separations, maximum transmitter output power/effective radiated power, class of transmitter intermodulation attenuation, bit rates and the use of digitized speech may be conditions to the issue of a licence by the appropriate Administration.

Requirements to be fulfilled by equipment designed to meet several ETSs can be found in clause 4.