Specifications

Appendix B – Sourcing Connectors & Peripheral Devices
Wireless ModemModule GSM/GPRS Developer’s Guide 45
GSM/GPRS Antenna
The integrated modem antenna connector is an MMCX connector. The MMCX connector incorporates a 'Snap
On' latching action in order to make the connection easier. It has excellent RF performance. An additional
advantage is its small physical size--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.
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 1990 MHz
Frequency
TX
824 to 849 MHz 880 to 915 MHz 1710 to 1785 MHz 1850 to 1910 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-5: MMCX Connector Example (right angle type)
Ordering
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 cardholder 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.