The Equipment

gps sattelite equipment smc iss


VHF Radio

Frequency Range136 – 174 MHz
Channel spacing12.5, or 20, 25 KHz
 Frequency error ± 2 ppm
RF-bandwidth 28 MHz
Antenna impedance50 Ohm
Temperature range-25° to + 55°C

VHF Antenna

Frequency Range136-174 Mhz
 Band Width @ 2:1 VSWR5%

Internal Alarm Switches

No of alarms8
Switches4 bi-directional toggle

Off = No alarm

Flashing = Sending alarm to the central control system

Steady = Alarm received at the central control system

External Alarm Switches

 No of alarms32
ContactsVolt-free Contacts, One per alarm

Off = Contacts open

Flashing = Contacts Closed (Sending to central control system)

Steady = Contacts Closed (Received at central control system)

Messaging System

 TerminalPC, Laptop, Palm PC or Custom terminal
Data mode9,600 Bps
Max Message size 256 Bytes. Larger messages may be split into 256 Byte pieces.
RoutingThrough a central control system

External Instrumentation

Data mode≤19,200 Bps
Message FormatCustom software to read the instrument and format messages

Inmarsat Satellite operation

Transmit Frequency

Receive Frequency

1626.5 to 1660.5 MHz

1525.0 to 1559.0 MHz

 Channel Spacing 5 / 2.5 / 1.25 kHz
Data Rate 600 bit/sec.
RX Frame Length8.64 seconds
DC Power Source10.5 to 32 V floating DC
RX Power Requirement:1,8W
TX Power Requirement23 W @ 12V supply
Throughput200 Byte/Second

Thuraya Satellite operation

Modem CommandsHayes AT Commands. Some special Thuraya GSM modem options.
Speed9600 Bps