NAL Research Corporation (TN2012-02-V1.0)
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SYN7391-C. If the specific application requires a custom antenna, it must meet the specifications in the
following table.
Satellite signal strength reported by the A3LA-RS when issuing an AT+CSQ command indicates the
signal strength of the ring channel. Care should be taken when using this signal reading for comparisons
between devices. Of particular notes are the followings:
1.
There is a 0.5 dB tolerance on the calibration.
2.
Each bar represents a 2 dB increment.
3.
Multiple ring channels can be present at the same time so units can lock to different signals.
4.
If the reading is near the decision threshold it would be easy to see a 1 bar difference.
5.0 SIM CARD INTERFACE
The A3LA-RS modem contains an integrated SIM reader. The modem uses and requires an Iridium SIM
chip for operation. The SIM chip is detached from the full-size Iridium SIM card. The SIM chip is inserted
into the opening located on top of the modem. A plastic locking mechanism (same as with GSM wireless
phones) is used hold the SIM in-place. Place the SIM chip (facing down) into the SIM reader’s bracket as
shown in Figure 6. Make sure that the cut-off on the SIM chip aligns with the SIM reader.
6.0 CONFIGURATION SETTINGS
The A3LA-RS allows users to configure its data port communication parameters. The three configuration
types are active, factory default, and stored. The active configuration is the set of parameters currently in
PARAMETER
VALUE
Operating Temperature Range
–40
o
C/+85
o
C without loss of function
Measurement Frequency Range
1616 to 1626.5 MHz
VSWR
< 1.5 : 1
Maximum Gain
3 dBic
Nominal Impedance
50 Ohms
Polarization
Right Hand Circular (RHCP)
Basic Pattern
Omni directional and hemispherical
Figure 6.
Location of the SIM reader.
SIM Chip
SIM Reader