Motorola Mobility LLC T56KL1 Manual Do Utilizador
Chapter 2: Hardware Interface Description
April 15, 2010
H24 - Module Hardware Description
47
•
Enabling the power supply is done using the +MGPSAPWR AT command.
•
The power supply voltage level can be controlled by the same AT command (50mV steps).
Note:
Refer to
"H24 Developer’s Guide - AT Commands Reference Manual, P/N 6802986C37"
for more information.
The external active antenna should meet the following requirements given in the following table:
Note:
The H24 module supports active GPS antenna only.
Note:
LNA gain above >23 dB can cause saturation of the GPS receiver.
GPS Antenna Connector Location
Figure 2-21: GPS Antenna Connector Location
GPS Antenna - Installation Guidelines
•
It is recommended that the GPS antenna will not be installed adjacent to the cellular antenna.
ACTIVE GPS ANTENNA REQUIREMENTS
Frequency range
1575.42 MHz (GPS L1 band)
Bandwidth
+/- 2 MHz
Impedance
50 ohm
Total gain
19dB to 23dB
Total NF
<2.5dB
Supply voltage
3.05V
Current consumption
Typical 20 mA (100mA max)
Cellular to GPS port isolation
824-915MHz >10dB
1710-1785MHz>19dB
1850-1980>23dB
1710-1785MHz>19dB
1850-1980>23dB
GPS
Antenna
Connector
Antenna
Connector