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TV analyzer aimed at DTV transmitters

Posted: 24 Apr 2012 ?? ?Print Version ?Bookmark and Share

Keywords:TV analyzer? transmitter? spectrum analysis? power measurement?

Rohde & Schwarz has announced a mid-range, multistandard TV analyzer that supports the ISDB-T, DVB-T and DVB-T2 digital terrestrial standards. The R&S ETC provides network operators with a convenient, cost-effective solution for testing their transmitters during commissioning, maintenance and servicing, indicated the company.

The R&S ETC is engineered for a range of functions such as spectrum analysis, TV analysis, scalar network analysis and power measurement. It can also be used for network coverage measurements, such as during drive tests.

The TV analyzer fully supports the DVB-T2 single and multiple PLP transmission modes. It provides a detailed display of constellation diagrams, channel impulse response, shoulder distance of the OFDM spectrum and MER(k) (modulation error ratio versus OFDM carriers). The R&S ETC has an integrated preselection and preamplifier that increases both dynamic range and sensitivity, so that even weak signals received over the air can be measured, noted Rohde & Schwarz. Connecting an external power sensor turns the R&S ETC into a high-precision RF power meter.

The core component of the R&S ETC is an FPGA-based demodulator that demodulates the received signal in realtime and helps to achieve high measurement accuracy. Featuring high measurement speed, the analyzer reliably detects even short-term interfering signals that occur at irregular intervals. Realtime demodulation allows continuous measurement of the bit error ratio (BER) of the received signal. The decoded transport stream is available at the analyzer's ASI output for further processing, for example to display TV pictures.

The R&S ETC is controlled via keypad and a rotary knob. Frequently used functions are assigned to hardkeys. Users can save all settings for a given measurement task as a measurement profile that can be recalled as necessary. This saves time and helps to prevent operator errors by reducing the number of manual entries to be made. For coverage measurements, the characteristic of the test antenna must be taken into account. Transducer factors for a given test antenna can be saved in the R&S ETC. They will then be used for the automatic compensation of the antenna's frequency response during measurements.

The R&S ETCView PC software, which is included with the R&S ETC, makes documentation of results easy, indicated the company. It also includes editors for generating channel tables, measurement profiles, transducer factors and limit-value tables, which are downloaded into the R&S ETC. Data transfer between the R&S ETC and the PC takes place over USB or LAN. The software also enables remote signal monitoring, for example at unattended transmitter sites.

The R&S ETC compact TV analyzer with the R&S ETCView Windows-based PC software is available from Rohde & Schwarz.





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