Cobham AvComm has announced that TETRA base station test capabilities are available for the Cobham AvComm 8800SX and the 3550R Radio Test Sets.
Terrestrial Trunked Radio (TETRA) is a specialist professional mobile radio and two-way transceiver, designed for use by government agencies, and specifically emergency services, police forces, fire departments, ambulance, rail transportation staff, transport services, and the military. TETRA is an ETSI standard that uses time division multiple access (TDMA) with four user channels on one radio carrier and 25 kHz spacing between carriers. Both point-to-point and point-to-multipoint transfer can be used. Digital data transmission is also included in the standard, though at a low data rate.
The transmitter testing for TETRA base stations includes measuring the critical modulation parameters. This includes RMS EVM (Error Vector Magnitude), Peak EVM, Residual Carrier, Frequency Error, and Signal Power. In addition to these measurements, users may also graphically display the modulation with the Constellation Diagram. This display illustrates the accuracy of the modulation of the TETRA base station by showing the phase and magnitude at each of the “symbol points” of the demodulated signal. The symbol points are the critical points in the modulation that are decoded into the digital information.
Field-testing for TETRA receivers is also a feature of the TETRA Base Station Test. The TETRA Standard defines the method for generating the TETRA BS T1 test signal, and by use of this signal, the user can measure the sensitivity of the TETRA base station receiver.
The TETRA Base Station Option for the 3550R is 3550OPT22 and for the 8800SX it is 88XXOPT162. This software option, like all options for the 8800SX and the 3550R, is field upgradeable and compatible with all versions of the 8800 Series and the 3550 Series. For more information, click here.