ORBCOMM OG2 Modem Integration Manual
15
I/Os
: Provides optional analog or digital input and outputs. These are typically used to connect
sensors or to connect to the system elements which need to be controlled
Serial Data
: Serial interface through which another embedded application or external
processor/sensor can transfer data.
RF In/Out
: The Modem has U.FL connectors for satellite and GPS antenna signals.
3.1
VHF Transmitter
3.1.1
Transmit Modulation
The transmitter uses Symmetric Differential Phase Shift Keying at 2400 bits per seconds.
3.1.2
Output Power
Output power is fixed at approximately 5.5 Watts ±0.5 Watts. Value is set at the time of
manufacture and no further adjustments are made during operation.
3.1.3
Output Power Variance
During any transmission, the transmit power shall vary by no more than ±1.0 dB under any
combination of temperature and frequency.
3.1.4
Transmitter Power
The maximum EIRP, measured in a 4 kHz bandwidth, transmitted from a modem shall not exceed
10 dBW in all directions. (EN 301 721)
The graph below shows the measured RF power output as the input is increased from 2.8 volts DC
to 15 volts DC. Values provided below 6 VDC are provided for reference only. ORBCOMM’s
integration manual specifies an input voltage no lower than 6 VDC.
