Specifications

Chapter 9 – SocketModem CDMA (MTSMC-C)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342C) 127
Sources for Peripheral Devices
CDMA 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.
Radio Characteristics
CDMA 800 CDMA 1900
Frequency RX
869 to 894 MHz 1930 to 1990 MHz
Frequency TX
824 to 849 MHz 1850 to 1910 MHz
Impedance
50 ohms
VSWR
<2
Typical Radiated Gain
0 dBi in at least one direction
MMCX Plug
The SocketModem requires an MMCX plug to connect to an antenna.
MMCX Connector Example (right angle type)
MMCX / SMA Adapter
A small MMCX / SMA adapter can be ordered, for example, from:
Amphenol
http://www.amphenol.com
Order No: 908-31100
Antenna Cable
An optional 6” antenna cable can be ordered from Multi-Tech Systems, Inc.
6-Inch Antenna Cable – SMA Jack to MMCX Plug