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Cable load generator boats 47-1002MHz frequency range

Posted: 22 Nov 2011 ?? ?Print Version ?Bookmark and Share

Keywords:cable load generator? cable TV network? analog and digital signal?

Rohde & Schwarz has rolled a cable load generator that according to the company is the first instrument on the market to simulate a cable TV network with all channels fully loaded with analog and digital TV signals. The company added that the device allows engineers and technicians to do away with various instruments in development and certification by using only the R&S CLG.

The device measures 19in wide and 1HU high but it can replace an entire rack of signal generators commonly used in test systems, stated Rohde & Schwarz. The R&S CLG has a frequency range of 47-1002MHz and can generate up to 160 freely combinable analog and digital signals. It is capable of simulating a U.S. cable TV network with 158 channels and a European network with up to 119 channels. Manufacturers of cable TV tuners and set-top boxes now need only the R&S CLG to test products during development. And many certification tests can also be performed with this instrument, the company said.

R&S CLG

The R&S CLG can simulate a U.S. cable TV network with 158 channels.

Fully modulated digital cable channels contain either video/audio content or a pseudo random bit sequence (PRBS) per channel. The analog channels carry test patterns and test tones. The R&S CLG supports the J.83/B, DVB-C and ISDB-T digital standards and the PAL and NTSC analog standards.

Receiver tests in line with ANSI/SCTE 40 can also be performed. ANSI/SCTE 40 requires that TV receivers function properly even when all channels in a cable network are fully loaded and with interference present. The R&S CLG simulates the AC hum that often occurs in cable TV and is manifested as superimposed amplitude modulation. The frequency can be set in the range from 47-63Hz. In addition to full channel loading, the R&S CLG also generates adjacent channel signals and a discrete CW interference signal for ANSI/SCTE 40 compliant tests. And network equipment manufacturers can generate CW signals and perform CSO/CTB measurements to check the linearity of their broadband CATV amplifiers, noted Rohde & Schwarz.

The R&S CLG's intuitive GUI makes it easy to configure complex test scenarios. The instrument can be operated using a PC over a web GUI or by remote control using SCPI commands or SNMP, making it ideal for integration into automated test systems. The signal level and frequency can be separately set for each channel in order to simulate a cable TV network with full channel loading. It is not even necessary to set the amplitude of each channel individually: The R&S CLG allows the user to define a tilt across the entire spectrum, and the generator sets the individual channels to the corresponding levels.

The R&S CLG cable load generator is available from Rohde & Schwarz.





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