Next Generation Microwave Radio Applications

When designing and selecting a microwave radio solution, the implementer must balance a number of tradeoffs to ensure reliable service. The physical attributes (link length, antenna size) along with the RF parameters (frequency, modulation scheme, power, and bandwidth) must be properly chosen so the payload is successfully transported to the end of the link.

With previous generations of radios, these parameters had to be fixed prior to installation, resulting in potential operational risk, as well as limited flexibility and bandwidth growth.

The new generation of digital microwave radios provides flexible options for the user. SAS has harnessed this technology to enable converged service solutions in a variety of fixed and mobile deployments.

The system shown above provides multi-service aggregation and transmission from both a mobile and a fixed site to a fixed terminus. The microwave radios allow selection of channel capacity, modulation level and type, RF frequency channel and output power to meet various regulatory and payload requirements. The service interface of the radio is a standard 10/100BT Ethernet interface.

Antenna positioning at the mobile site is accomplished using an automatic positioning system that uses a GPS-based tracking system to ensure correct alignment of the antenna. This literally takes the guesswork out of establishing the link. If other mobile sites exist, their location is determined by transmitting a “request for GPS location” to the intended target via VHF/UHF radio. The target mobile site sends its coordinates to the original site, allowing the requesting mobile site to attain antenna lock with the target site.