Wavecom G1800 Manual de usuario descargar pdf (Pagina 9)

WM2C-G900/G1800 08/01/00

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2.2. RF Functionalities

The RF functionalities comply 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 WISMO2C does not support RF swith for a car kit connection,

thus it has to be put on the mother board on which the module is set.

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

◊ 2 dedicated down-converters.

◊ 1 FI demodulator

◊ 1 VCO

◊ Transmit loop (modulator, down mixer, phase frequency

comparator)

The RF concept is designed to reduce cost and overall size

supporting the removal of the duplexer (for each bandwidth).

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Wavecom G1800 Manual de usuario Pagina 9