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GSM Modem

Contents

The basic offer comprises the following elements:The basic offer comprises the following elements:

  • Modem
  • 5v Power
  • User manual (datasheet CD)
  • attenna (a standard deported cellular phone antenna)
  • RS232 interface serial link cable
  • speakerphone and microphone

Basic offer

The Basic offer set is presented in a unique conditioning, Which external dimensions are close to the following values:

70mm (width) x 60mm (height) x135mm (length)

This is a cardboard box. It is build-in small waves, which are covered with a thin film of white ice-cold paper.

It has a 1.5m line and >3db amp.

RF architecture

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

  • 2 dedicated down converters
  • IF demodulator
  • All local RF & IF VCO
  • PLL
  • Transmit loop (modulator, down mixer, phase frequency comparator)
  • 2 power amplifiers

RF frequencies

The RF functionalities comply with the Phase II EGSM 900/GSM 1800 or GSM 1900 recommendation:

  • Rx (EGSM): 925 to 960MHz
  • Tx (EGSM): 880 to 915MHz
  • Rx (GSM 1800): 1805 to 1880MHz
  • Tx (GSM 1800): 1710 to 1785MHz
  • Rx (GSM 1900): 1930 to 1990MHz
  • Tx (GSM 1900): 1850 to

RF performances

1) Receiver

  • EGSM 900 sensitivity: < -102 dBm
  • GSM 1800/1900 sensitivity: <-102 dBm
  • Selectivity @ 200 KHz: > 9 dBc
  • Selectivity @ 400 KHz: > 41 dBc
  • Dynamic range: > -43 dBm
  • Co-channel rejection: >= 9 dBc

2) Transmitter

  • Maximum output power for EGSM 900: 33dBm ± 2dB
  • Maximum output power for GSM 1800/1900: 30dBm ± 2dB
  • Minimum output power for EGSM 900: 5dBm ± 5dB
  • H2 level: < -30 dBm
  • H3 level: < -30 dBm
  • Phase error at peak power: <5° RMS
  • Frequency error: ± 0.1 ppm max

Antenna specifications

  • Frequency band: Dual band E-GSM 900Mhz – GSM 1800MHz/GSM 1900Mhz
  • EGSM 900 GSM 1800 GSM 1900
  • Rx band 925-960MHz 1805-1880Mhz 1930-1990MHz
  • Tx band 880-915Mhz 1710-1785Mhz 1850-1910MHz
  • Impedance: 50
  • VSWR Tx max 2:1 / Rx max 2:1
  • Typical radiated gain: 0dBi

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