SEE Telecom designs and manufactures Tetra repeater systems to enhance radio coverage of Belgian National Public Safety Network ASTRID.
ASTRID Tetra Repeaters
SEE Telecom designs and manufactures Tetra ASTRID repeater systems (BDA – Bi-Directional Amplifiers):
- To enhance the radio coverage of national public safety network ASTRID in Belgium in major infrastructures like shopping centers, exhibition halls, convention centers, hospitals, confined areas such as service corridors, tunnels, underground car parks.
Monitoring and control can be done via SNMP, SCADA, via Ethernet using a web browser installed on a PC which gives access to the GUI, or remotely via an optional LTE modem which allows accessing the repeaters GUI from everywhere, using the 4G network. This interface contains an easy configuration page.
The MC-DIRRAC also has a sum alarm output that can be connected to an external alarm system.
The Tetra ASTRID repeater can be ordered with different powers (low, medium and high), different power supply voltages, with a 4 hours battery backup, and with LTE modem. Because each installation is unique, SEE Telecom proposes a complete portfolio of solutions with off-air and optical repeaters, advanced technologies as band selective, channel selective, AGC per time slot, squelch, frequency shifting, WDM, remote monitoring HTTP-SNMP.
The Tetra ASTRID repeater is full homologated to be used on the Belgian network.
ASTRID Tetra Network
Bi-directional high power
6.5 MHz bandwidth
Up to 8 channels independently processed
AGC/ALC by timeslot
Monitoring and control via IP
Homologated by ASTRID
No near-far effect
Large coverage capability
Astrid repeaters are available in optical-to-RF (OMU) and RF-RF (off-air repeater) formats.
OMU consists of a Master station distributing the RF signals to remote units (ORU) with optical transmitters and optical receivers, by optical fibers. These Optical Remote Units (ORU’s) transform the optical signal into RF, amplify it, and then deliver it to the infrastructure at the appropriate power level.
The off-air repeater has two RF connectors, one connected to the antenna pointing toward the base station, and the second one is connected to the antenna or radiating cable in the infrastructure itself.