Integration Manual

AH3-US Hardware Interface Overview
5.2 GPS Antenna Interface
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AH3-US_HD_v01.000 Page 32 of 42 2012-05-29
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5.2 GPS Antenna Interface
In addition to the RF antenna interface AH3-US also has a GPS antenna interface. See Section
6.1 to find out where the GPS antenna pad is located. The GPS pad is the same as for the RF
antenna interface (see Section 5.1.1 ).
It is possible to connect active or passive GPS antennas. In either case they must have 50Ohm
impedance. The simultaneous operation of GSM and GPS has been implemented. For electri-
cal characteristics see Section 6.8.
Active 3V GPS antennas can be supplied via the GPS antenna interface, if the supply voltage
is switched on. This is done by AT command: AT^SGPSC="Power/Antenna" to configure the
use of an active GPS antenna and AT^SGPSC="Engine" to start the GPS receiver (for com-
mand details see [1]). The available current is limited to prevent short circuits.