Справочник Пользователя для Multitech MultiModem Wireless Modem GSM/GPRS with GPS MTCBA-G-GP-F1

Chapter 4 – Antennas and Cables 

Multi-Tech Systems, Inc. MultiModem Wireless EDGE, GPRS, and CDMA Modems with GPS (S000376A) 

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The antenna sub-system and integration in the application is a major issue: Choice of antenna (type, length, 
performances, thermal resistance, etc.) These elements could affect GSM performances such as sensitivity and 
emitted power. 

 

The integrated modem antenna connector is a SMA connector.

 

The SMA connector incorporates a 'Screw-on'  action 

in order to make the connection easier while providing 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. 

 

 

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 

 

869 to 894 MHz 

1930 to 1990 MHz 

824 to 849 MHz 

1850 to 1910 MHz 

                           50 ohms 

                              <2 

               0 dBi in at least one direction 

 
 

An antenna that meets the requirements for use with this product is included with your purchase.