South Australian Police
The South Australian Government Radio Network (SAGRN) is one of the largest wide area radio networks in the world covering several thousand square kilometres from the WA border to the Victorian border in the east.
Following a competitive tender process, Tetracom has been contracted by SA Police to improve the functionality of many of the vehicle mounted radios in their fleet by adding In Vehicle Repeater (IVR) modules manufactured by LMR Systems. The advantage of the IVR is that it will provide extended coverage from portable radios in remote areas as well as improved in building coverage in built up areas. To provide the best value possible, the equipment offered by Tetracom is fully compatible with the current system and will easily upgrade to the new P25 system as this transition occurs.
The IVRs work by leveraging the higher performance of the in vehicle radios with their more efficient antenna systems and higher output power, which in turn interfaces via the IVRs to a second, local antenna system.
When the officers leave the vehicles, the IVRs are activated which will then allow their portable radios to connect to the main wide area network. This often occurs in areas where the portable radios may not have reliable coverage on their own.
The IVR ensures all communication remains securely encrypted end to end, eliminating the possibility of external interference. Should multiple vehicles attend an incident, the IVRs have a unique built in priority algorithm, ensuring that only one repeater is active on any given talk group. This algorithm covers vehicles entering and leaving a scene with each IVR constantly communicating with other nearby units.
A priority hierarchy is established to ensure that only one IVR is in repeat mode at any given time in order to prevent collisions in transmit activity. This ensures that each officer is using the same channel and all who are in attendance are able to be involved in all critical communications at all times.