R&S®ETL TV Analyzer - Product Brochure - Rohde & Schwarz

Frequency response measurementTo keep the interfering intermodulation products in a cablesystem to a minimum, but still ensure a sufficient minimumsignal level over the system's entire frequency range, thelevels defined for the analog, digital and FM (radio) channelsmust be precisely adhered to. The TILT measurement providesa quick overview of the levels. The TILT measurementis based on a previously selected channel table and can becarried out for all or just for certain modulation standards.Markers make it easier to read the individual level values inthe previously created graphic. Level differences betweentwo selected channels are easy to measure, making it possibleto determine the frequency response of a cable system.Ingress measurement to detect interferersFor interference-free operation of a cable TV network, it isimportant to prevent ingress signals which could adverselyaffect the signal quality of the individual channels. Ingressprevention is gaining in importance because terrestrialdata services are entering the VHF/UHF frequency range,occupying former analog TV channels.Rohde & Schwarz has developed a special process to detectingress signals and integrated it into the R&S®ETL. Theingress (f) measurement provides a simple way to see interferingsignals that are superimposed on a useful digitalsignal. These interfering signals are typically difficult torecognize in the frequency spectrum and the constellationdiagram. MER(f) can also be selected as the display mode.MER is well known from the analysis of OFDM-basedTV standards, where it has long been used to detectinterferers.TILT measurement in a cable TV system.Frequency spectrum of a J.83/B-signal with interferer.Ingress (f), frequency spectrum of an interfering signal that is superimposedon the useful signal.MER (f) of a J.83/B-signal with superimposed interfering.Rohde & Schwarz R&S®ETL TV Analyzer 27