User's Guide

, 0.01
ORBCOMM
®
PROPRIETARY AND CONFIDENTIAL MATERIAL ©
7
2.4 VHF Receiver
Parameter
Value
Frequency Range
137 to 138MHz
Frequency Stability
< 2ppm
Data Rates / Modulation
4800bps Symmetrical-Differential Phase Shift Keying (SDPSK) modulation
Sensitivity
-120 dBm typical
Dynamic Range
-120 to -90 dBm
2.5 VHF Transmitter
Parameter
Value
Frequency Range
148.000 to 150.050MHz
Frequency Accuracy
< 2 ppm
Data Rates / Modulation
2400bps SDPSK modulation
Output Power
5 Watts typical
Antenna Gain (maximum)
3.0 dBi
Power Variance
Maximum ±1dB
Tx Duty-Cycle
9 seconds every 15 minutes
(?)
Spurious Emissions
Frequency Range Limit BW
100 kHz to 1G Hz -36
dBm 100 kHz
1G Hz to 12.75G Hz -30 dBm 1 MHz
1559.01 to 1626.50 MHz -40 dBm 1 MHz
VSWR
3:1 max