Data Sheet

QPRO Technical Data Sheet
Document 1137-0901, REV K 11
2.4.2 External Power Supply Requirements
In order for the modem to boot properly:
1) The supply voltage must be below 1.4 volts for 4 seconds before re-applying the 6 to 32 V.
2) The rise time on the supply voltage must be 10ms maximum, from 0 to 6Vdc.
2.4.3 Load Dump Protection
To pass the load dump testing requirement of the J1455 specification, there must be a minimum of two 33V
diodes placed in parallel between power and ground of the input power supply. Load dump protection is
necessary to protect the modem from possible high voltage at startup. With some heavy machinery at
startup, the alternator voltage can jump quite high until it is pulled down into regulation. This functionality has
been built into the QPRO.
2.4.4 Typical Power Consumption
This section describes the typical power consumptions of each component of the QPRO modem. Table 2-1,
Input Power Limits, is a listing of the required input voltage limits.
Table 2-1, Input Power Limits
Network Volts
ORBCOMM 10.5 - 32
Iridium-SBD 9 - 32
GlobalStar-
Simplex
6 - 32
Inmarsat-
IsatDataPro
9 - 32
GSM/GPRS 6 - 32
GPS 6 - 32
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