Wavecom G900 Manual de usuario descargar pdf (Pagina 7)

WM2C-G900/G1800 23/09/1999

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2.2. RF Functionalities

The RF functionalities are in line with the Phase II

GSM900/DCS1800 recommendation. The frequencies are :

• Rx (EGSM) : 925 to 960 MHz

• Tx (EGSM) : 880 to 915 MHz

• Rx (DCS) : 1805 to 1880 MHz

• Tx (DCS) : 1710 to 1785 MHz

The RF switch for car kit connection is not included in WISMO2C. It

has to be provided on the mother board on which the module is

mounted.

The RF part is based on a specific dual band chip which includes :

◊ 2 dedicated down-converter.

◊ 1 FI demodulator

◊ 1 VCO

◊ Transmit loop (modulator, down mixer, phase frequency

comparator)

The RF concept has been designed to reduce cost and overall size

providing the suppression of the duplexer (for each bandwidth).

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Wavecom G900 Manual de usuario Pagina 7