GSM modems
 GSM modems were recognized all over the world as an alternative to wire ones because it is not a secret that connection problems occur too often and sometimes there is no possibility to install a stationary telephone line. In this case you will not go without GSM connection. The Siemens MC35i modem is one of the most popular GSM modems in Russia.
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The basis of the given GSM/GPRS modem is SIM300 module produced by Sim Technology company. The modem has a metal frame and is equipped with DB-9 (RS-232) and RF-SMA connectors. Overall dimensions – 98 x 54 x 25 mm; weight – 130 g. It also features built-in TCP/IP protocol.
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This GSM modem is structurally complete. It is used for data and SMS transmission in GSM900/1800 standard. Control is carried out via modem AT-commands. GPRS technology support. To work with the Siemens MC35i GSM modem, you need to connect an antenna, constant-current source and any microprocessor-based controller or a computer of IBM PC type to its external connectors via COM-port (RS-232).
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The sunken GSM antenna with a cable and a connector. Frequency range - 900/1800 MHz; impedance - 50 Ohm. Amplification - 5 dB.
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GSM antenna with the magnetic stand, cable and connector. Connector type – FME; cable length – 2 m; impedance – 50 Ohm; gain level – 5 dB. The stand – 76 mm.
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