Telemetry Module MT-102 User's Manual - BlueNote Communications

As shown by graph, the value at which flags ANX_Set_F and ANX_Set_R, are set and cleared
depends not only on input signal level but on hysteresis defined for given input. Proper value
of hysteresis protects against excessive alarm generation by noise or oscillation around
threshold value signal.
4.6. SIM card
MT-102 telemetry module is equipped with standard miniature SIM card holder for
connecting card to GSM modem.
If use of GPRS transmission is intended the SIM card should have GPRS option and
possibility of login to APN for assigning static IP addresses activated. In absence of static IP
address, use of the module for GPRS transmission is impaired.
Proper placement of the SIM card is imperative for module's operation. The module accepts
only SIM cards operating in low potential technology 3,3V.
4.7. Antenna
Attachment of antenna is essential for proper operation of MT-102 telemetry module. SMA
socket is placed on module's front panel. The attached antenna has to secure appropriate
radio signal level enabling login to GSM network.
The type and placement of antenna has significant influence on module's sender/receiver
circuits. GSM signal level is reflected by SGN LEVEL LEDs on module's front panel. When
GSM signal level is not sufficient for reliable operation LED is not lit. In that case the use of
a directional antenna should be considered.
16