FLY E146, Инструкция по обслуживанию, Страница: 6 / 64

2 RF
2.1 RF Overview
RF part mainly consists of transceiver MT6253 (adopts program of near-zero IF
receiver, supporting the EGSM / DCS and 26M VCTCXO as the clock input,
integrated clock buffer, LO VCO and TX VCO and regulator, only need for
external connections of VBAT / AVDD), RF7161 (it supports EGSM / DCS
and integrated automatic power control and transceiver switch).
Transceiver (MT6253) with the RF modulation and demodulation functions
contains IF frequency synthesizer and VCO RF, which is part of the core
component of the RF. PA has a major role in amplification of modulation
signal, and it must be controllable and the speed should meet the GSM
agreement.