TV EXPLORER HD+ manual - Promax

USER’S MANUAL. TV EXPLORER HD +Figure 47.- Constellation Diagram. DVB-T2 (QAM 256) signal.By means of the rotary selector [1] and the arrow cursors [6] key, ispossible to change the frequency, channel or OFDM carrier on tune by the instrument.The DECAY option sets the visual persistence for symbol impacts on the screen ina range from 0 (minimum) to 16 (maximum).First appears the information about the type of modulation DVB-T2 (QAM-256).Next it is indicated the frequency, the channel and the carrier tuned. It is also indicatedthe carrier type (data or pilot). Finally, it shows the status line (similar to themeasurement screen).EnglishNOTEThe transmission quality is visualised in a qualitative way using a colour range forthe symbol density concentrated in a certain area. This colour coding goes from black(no symbols), to red (maximum density), and runs from blue to yellow in ascending order.A greater dispersion of the symbols indicates greater level of noise or worse signalquality.If concentration of symbols or noise appears is indicative of good carrier/noiseratio or absence of problems as phase noise, etc.,.5.15.3 DVB-C (QAM) signalSets on the UTILITIES menu by pressing theCONSTELLATION option.[22] key, and select the01/2011 Page 67