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 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 1 000 MHz, 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 which is hand portable, using an integral antenna and intended for the transmission of data and/or speech.
The technical characteristics given in this present document are independent of data rate but may in practice limit the maximum data rate achievable. Future editions of this present document may be prepared which may allow complex modulation methods, together with their appropriate limits, for use at higher bit rates.
In this present document, a digital radio equipment is defined as a radio equipment which transmits and/or receives data.
Data equipment is understood as equipment handling continuous bit streams or messages.
The equipment comprises a transmitter and associated encoder and modulator and/or a receiver and associated demodulator and decoder. The encoder and/or decoder may be a separate piece of equipment, in which case this present document covers the combination of encoder and/or decoder and transmitter and/or receiver equipment.
The present document is intended to cover the provisions of Article 3.2, of Directive 1999/5/EC [1] (R&TTE Directive), which states that "radio equipment shall be so constructed that it effectively uses the spectrum allocated to terrestrial/space radio communications and orbital resources so as to avoid harmful interfer (...abbreviated)