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Appendix B – Sourcing Guide for Connectors/Peripherals
Wireless ModemModule MTMMC-G-F1 and MTMMC-G-F2 Developer’s Guide
    
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GSM 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.
Table B-1: Radio Characteristics
GSM 850
EGSM 900
DCS 1800
PCS 1900
Frequency
RX
869 to 894 MHz 925 to 960 MHz
1805 to 1880 MHz 1930 to 990 MHz
Frequency
TX
824 to 849 MHz 880 to 915 MHz
1710 to 1875 MHz 1850 to 910 MHz
RF Power
Stand
2W at 12.5%
duty cycle
2W at 12.5%
duty cycle
1W at 12.5% duty
cycle
1W at 12.5% duty
cycle
Impedance
                                                           50 ohms
VSWR
                                                             <2
Typical
Radiated
Gain
                                          0 dBi on azimuth plane
The ModemModule requires an MMCX plug to connect to an antenna.
Figure B-6:  MMCX Connector Example (right angle type)
An antenna with matting connector can be ordered, for example, from :
IMS Connectors Systems GMBH
http://www.imscs.com/
A small MMCX / SMA adapter can be ordered, for example, from :
Amphenol
http://www.amphenol.com/
Order No: 908-31100
SIM Card Holder
The SIM card holder used in the integrated modem is a MOLEX connector.
Part number connector: 99228.
Part number holder : 91236.
For more information about this connector:
http://www.molex.com/
It is possible to use a stand-alone SIM cardholder through the 50-pin connector but the length of the SIM line
must not exceed 15 cm.