Chapter 4 - Sim Connector And Antenna Connector; Sim Connector; Antenna; Receiver Features - Multitech SocketModem EDGE Developer's Manual

Chapter 4 – SIM Connector and
This chapter describes the SocketModem SIM connector and the antenna and its connector.

SIM Connector

The internal SIM interface of the SocketModem supports the standard 3V SIM only.

Antenna

The integrated modem antenna connector is a MMCX connector. The MMCX connector incorporates a 'Snap On'
latching action in order to make the connection easier with an excellent RF performance. An additional advantage is
its small physical size, which is 50% of the standard MCX connector.
This type of connector is suitable for the standard ranges of flexible and semi-rigid cables. The characteristic
impedance of the MMCX coaxial connector is 50 ohm. The antenna manufacturer must guarantee that the antenna
will be working according to the radio characteristics presented in the table below.
RF performances are compliant with the ETSI recommendation 05.05 and 11.10.
The main parameters are:

Receiver Features

•
EGSM Sensitivity : < -104 dBm
•
GSM 1800/GSM 1900 Sensitivity : < -102 dBm
•
Selectivity @ 200 kHz : > +9 dBc
•
Selectivity @ 400 kHz : > +41 dBc
•
Dynamic range : 62 dB
•
Intermodulation : > -43 dBm
•
Co-channel rejection : + 9 dBc

Transmitter Features

•
Maximum output power (EGSM) : 33 dBm +/- 2 dB
•
Maximum output power (DCS/PCS) : 30 dBm +/- 2 dB
•
Minimum output power (EGSM): 5 dBm +/- 5 dB
•
Minimum output power (DCS/PCS): 0 dBm +/- 5 dB
•
H2 level : < -30 dBm
•
H3 level : < -30 dBm
•
Noise in 925 - 935 MHz : < -67 dBm
•
Noise in 935 - 960 MHz : < -79 dBm
•
Noise in 1805 - 1880 MHz : < -71 dBm
•
Phase error at peak power : < 5 ° RMS
•
Frequency error : +/- 0.1 ppm max
Radio Characteristics
Frequency RX
Frequency TX
RF Power Stand
Impedance
VSWR
Typical Radiated Gain
Multi-Tech Systems, Inc. SocketModem EDGE Embedded Wireless Modem Developer's Guide (S000376A)
Antenna Connector
GSM 850 EGSM 900
869 to 894 MHz 925 to 960 MHz
824 to 849 MHz 880 to 915 MHz
2W at 12.5% duty 2W at 12.5% duty
cycle cycle
50 ohms
0 dBi on azimuth plane
Chapter 4 - SocketModem Interfaces
GSM 1800
1805 to 1880 MHz
1710 to 1785 MHz
1W at 12.5% duty
cycle
<2
GSM 1900
1930 to 1990 MHz
1850 to 1910 MHz
1W at 12.5% duty cycle
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