"The present document defines the requirements for the transceiver of the pan-European digital mobile cellular and personal communication systems operating in the 900 MHz and 1 800 MHz band (GSM 900 and DCS 1 800). Requirements are defined for two categories of parameters: - Those that are required to provide compatibility between the radio channels@ connected either to separate or common antennas@ that are used in the system. This category also includes parameters providing compatibility with existing systems in the same or adjacent frequency bands. - Those that define the transmission quality of the system. The present document RF characteristics for the Mobile Station (MS) and Base Station System (BSS). The BSS will contain either Base Transceiver Stations (BTS) or microcell base transceiver stations (micro-BTS). The precise measurement methods are specified in 3GPP TS 11.10 and 3GPP TS 11.20. Unless otherwise stated@ the requirements defined in the present document apply to the full range of environmental conditions specified for the equipment (see annex D). In the present document some relaxations are introduced for GSM 900 MSs which fulfil the following conditions: - pertain to power class 4 or 5 (see subclause 4.1.1); - not designed to be vehicle mounted (see 3GPP TS 02.06). In the present document these Mobile Stations are referred to as ""small MS"". NOTE: In the present document@ a handheld which can be connected to a car kit is not considered to be vehicle mounted. MSs may operate on more than one of the frequency bands specified in clause 2. These MSs@ defined in 3GPP TS 02.06@ are referred to as ""Multi band MSs"" in the present document. Multi band MSs shall meet all requirements for each of the bands supported. The relaxation on GSM 900 for a ""small MS"" are also valid for a multi band MS if it complies with the definition of a small MS. The RF characteristics of repeaters are defined in annex E of the present document. Annexes D and E are the only clauses of the present document applicable to repeaters. Annex E does not apply to the MS or BSS."