Base station test capabilities now available on radio test sets

Cobham AvComm has announced TETRA base station test capabilities are available for their 8800SX and 3550R Radio Test Sets. “Cobham is pleased to announce the TETRA Base Station testing option for both the 8800SX Digital Radio Test Set and the 3550R Touch-Screen Radio Test System,” said Lyndon Zielke, Sr product marketing engineer. “With this option, the customer now has a cost-effective and portable way for performing all required TETRA base station field tests, including transmitter and receiver testing.” The transmitter testing for the base stations includes measuring the critical modulation parameters. This covers RMS EVM (Error Vector Magnitude), Peak EVM, Frequency Error, Residual Carrier, and Signal Power. In addition to these measurements, users can also graphically display the modulation with the Constellation Diagram. This display demonstrates the accuracy of the modulation of the TETRA base station by showing the magnitude and phase at each of the “symbol points” of the demodulated signal. The symbol points are the crucial points in the modulation that are decoded into the digital information.