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6.2 US GSM/GPRS modem module
The US GSM/GPRS modem is the Wavecom Wismo Quick Q2426B.
It is a self-contained GSM/GPRS 850/1900 dual-band module including
following features:
2 watts GSM 850 radio section running under 3.6 volts
1 watt GSM1900 radio section running under 3.6 volts
Digital section running under 2.8 volts
3V only SIM interface
Real time clock with calendar
Battery charge management
Echo cancellation + noise reduction
Full GSM or GSM/GPRS software stack
Complete shielding
Complete interfacing through a 60-pin GPC connector:
Power supply
o
Serial link
o
SIM card interface
o
RF connection pads ( to the antenna)
6.2.1
RF functionalities
The radio frequency part is based on specific dual band chip including:
Low – IF receiver
Dual RF synthesizer
Digital IF to Baseband Converter
Offset PLL transmitter
One logarithmic Power Amplifier module
Dual band Power amplifier module
6.2.2
Baseband functionalities
The digital part is based on a Philips-VLSI chip (ONE C GSM/GPRS Kernel).
The chipset is using a 0.25micron mixed technology CMOS wich allow massive integration as well as low current
consumption.
6.2.3
Applications
The module is designed to be integrated into various types of applications such as handsets or vertical
applications (telemetry, multimedia,..).
For vertical applications, the internal firmware offers a set of AT commands to control the module.
6.3 Antenna
The antenna has a magnetic base and it is prewired with 5 m of coaxial 50Ω cable. It
is delivered with SMA male right angle connector. With this solution the extra depth
necessary in front of the module to mount the antenna cable is less than 25 mm.
Air Contact Hardware Manual
15
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