05.053GPPRadio transmission and receptionTS
An Antenna Feeder Loss Compensator (AFLC) is physically connected between the MS and the antenna in a vehicle mounted installation. It amplifies the signal received in the downlink direction and the signal transmitted in the uplink direction, with a gain nominally equal to the loss of the feeder cable. Unless otherwise stated, the requirements defined in this specification apply to the full range of environmental conditions specified for the AFLC (see annex D2 of 3GPP TS 05.05).
This specification details the minimum radio frequency performance of GSM AFLC devices. The environmental conditions for the AFLC are specified in annex D.2 of 3GPP TS 05.05. It also includes informative guidelines on the use and design of the AFLC.
The following requirements apply to AFLC devices intended for use in the GSM 400, GSM 900 and DCS 1 800 frequency bands. For GSM 900, the requirements apply to an AFLC intended for use with a GSM 400 and GSM 900 class 4 MS. For DCS 1 800, the requirements apply to an AFLC intended for use with a DCS 1 800 class 1 MS. For compatibility reasons, a GSM 900 AFLC is required to support the Extended GSM band.
The requirements apply to the AFLC, including all associated feeder and connecting cables. A 50 ohm measurement impedance is assumed.
When referred to in this specification:
– the maximum rated output power for a GSM 400 and GSM 900 AFLC is +33 dBm and for a DCS 1 800 AFLC is +30 dBm;
– a GSM input signal, is a GMSK signal modulated with random data, which meets the performance requirements of 3GPP TS 05.05, for an MS of equivalent output power. The power level specified for the GSM input signal, is the power averaged over the useful part of the burst.