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Data Sheet

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Q4000 Technical Data Sheet
Document 1135-0902, REV K 17
Do not place Orbcomm antennas within six feet of each other.
For best results use only approved Orbcomm antennas
Iridium Short Burst Data (SBD)
3.4
• Performance
o Transmit Output Power: 2 Watts
• Features
o Uplink (Tx)
1616-1626.5 MHz
50 ksps
o Downlink (Rx)
1616-1626.5 MHz
50 ksps
• Message Size
o Tx 340 bytes/Rx 270 bytes
If the antenna VSWR exceeds 3:1 the PA will be turned off to protect the modem from damage.
Iridium requires Iridium approved antennas
Antenna cables greater than 3 dB will degrade network performance. See Table 3-1, Cable Loss, for
more information.
Globalstar (Simplex)
3.5
• Performance
o Transmit Output Power: 18 dBm +/- 2 dBm
• Features
o Frequency of Operation
1611.25-1618.75 MHz
o 9 to 144 byte messages
Antenna cables greater than 3 dB will degrade network performance. See Table 3-1, Cable Loss, for
more information.
Cable Loss Guidelines
3.6
The table below shows the amount of loss for different cable types.
Table 3-1, Cable Loss Guidelines
Cable P/N
Cable
type
Loss at 150
MHz dB/m
Loss at 1600
MHz dB/m
Belden 8216
RG-174 0.38 dB/m 1.59 dB/m
Belden 9201
RG-58 0.181dB/m 0.792 dB/m
Belden 9913
RG 8 0.56 dB/m 0.208 dB/m
TMS LMR-
400
LMR-400 0.54 dB/m 0.188 dB/m
TMS LMR-
600
LMR-600 0.034 dB/m 0.122 dB/m