700- LT1-Man Rev 8 09 Feb 2021
Page 52/60
DATA and TRANSMISSION
Data Rates
Satcom (Iridium):
340 B (Max Mobile Originated Message Size
270 B (Max Mobile Terminated Message Size)
Transmit Frequency
Ranges
Satcom
(Iridium): 1616 to 1626.5 MHz
Bluetooth:
2360 to 2500 MHz
RF Bandwidths
Satcom (Iridium):
31.5 kHz
Bluetooth:
1 MHz
RF Transmit Power
(conducted)
Satcom (Iridium):
+32 dBm max.
Bluetooth LE:
+4 dBm max.
Antenna
Satcom (Iridium):
RHCP, 50 ohms, 3 dBi max (
SMA
-connector)
GPS:
RHCP, 3.3V/50 mA active (
SMA
-connector)
Bluetooth LE:
Internal
Real Time Clock
Synchronized to GPS
Clock accuracy: ±1 second
C.4
4 AND 8 PIN CONNECTOR MAXIMUM RATINGS
4-pin
connector
pin #
Name
Pin Function
Maximum rating
1
CG
Chassis Ground
–
2
G
Power Ground
–
3
HT
High Current Power In 20 VDC max., -20 VDC min.
4
PW
Battery Power In
LT1-CELL/LT1-IRID: 20 VDC max., -20 VDC min
LT1-GOES: 16 VDC max., -20 VDC min.
8-pin
connector
pin #
Name
Pin Function
Maximum rating
1
B
RS-485 Comms B
12 VDC max., -7 VDC min.
2
A
RS-485 Comms A
12 VDC max., -7 VDC min.
3
G
Signal Ground
–
4
SD
SDI-12 Data
6 VDC max., -3.5 VDC min.
5
SP
SDI-12 Power Out
LT1-CELL/LT1-IRID: 20 VDC max., 0 VDC min
LT1-GOES: 16 VDC max., 0 VDC min.
6
GD
Power Ground
–
7
RN
Discrete Counter In
12 VDC max., -0.5 VDC min.
8
P
RS-485 Sensor Power
Out
LT1-CELL/LT1-IRID: 20 VDC max., -20 VDC min.
LT1-GOES: 16 VDC max., -20 VDC min.