Creowave introduced its TETRA frequency shifting repeater at TETRA World Congress. The repeater is designed for use in large outdoor locations with minimal requirement for isolation between uplink and downlink antennas.
The repeater has two units – master and slave. The master unit converts the TETRA downlink carrier to the selected frequency and the slave unit converts it back to the original. The shifted frequencies are used only in traffic between master and slave. For the user it is possible to configure the size of the frequency shift for each carrier.
The innovation builds on the software definable TETRA channel selective repeaters, which Creowave introduced in 2009. Now, the latest improvements mean these software definable repeaters can be upgraded to TETRA frequency shifting repeaters.
The solution overcomes a problem with repeater antennas that sometimes occurs in traditional set-ups where isolation between two repeater antennas can cause interference. By shifting the frequency users can extend outdoor coverage and get more capacity out of their network.
Creowave CEO Jyrki Koski said: ‘The repeater is an excellent choice for large outdoor coverage cases where the isolation between paths has previously been the limiting factor. The software definable TETRA channel selective repeaters can be upgraded to TETRA frequency shifting repeaters, so the customer doesn’t have to know the need of the exact repeater type beforehand.
There is an added bonus, as Koski explained: ‘In addition, if the frequency shifting feature is no longer needed at some point, the TETRA frequency shifting repeater can be used as a normal channel selective repeater. These features provide flexibility to the customer.’
The software definable repeaters are very easy to set up and configure and Creowave’s network management system allows users to do this remotely over-the-air.