Specifications

10.1. GSM MODULE
10.1 GSM Module
The GSM module used in this project is purchased fully assembled, with all
radio-frequency stages and the controlling firmware hidden from the system
integrator. The modules are FCC, GE, GCF, PCTRB and IC approved and
fully conform to the GSM specification, being “fully Type Approved and do
not require any additional test, as far as the GSM RF and Protocol part of
99/5/EC is concerned” [26]. Thus, this device is categorised as a standard
mobile telephony device and requires no further license.
10.2 RFID Readers
The RFID readers in this project op erate in the 119 - 135kHz band (“Inductive
loop system including RFID’s”[27]) which has a stipulated maximum power
output of 72dBµA/m at 10m as defined in EN 300 330 and EN 301 489-
1,3. Although as yet untested, it is belie ved that this project is well within
these limits as the 644cm
2
antenna has only 8 turns and the reader device
consumes only 450mA when transmitting.
The remaining concerns are related to channel spacing and interference.
As shown in Figure 5.12, the emitted signal is very poor and little of the
higher-order harmonics are emitted. It is thus unlikely that interference will
be a problem or channels overlap.
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