TV EXPLORER HD+ manual - Promax

USER’S MANUAL. TV EXPLORER HD +On screen appears the modulation type: DVB-C (256 QAM). Also the frequencyand channel number are indicated. Finally, it shows the type of DVB-C broadcastnetwork used.Figure 48.- Constellation diagram. DVB-C (QAM 256) signal.NOTEThe transmission quality is visualised in a qualitative way using a colour range for thesymbol density concentrated in a certain area. This colour coding goes from black (nosymbols) 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/noise ratio orabsence of problems as phase noise, etc.,.5.15.4 DVB-S/S2 (QPSK/8PSK) signalGo to the UTILITIES menu by pressing theCONSTELLATION option.[22] key, and then select theThe modulation type: DVB-S (QPSK) or DVB-S2 (8PSK) is showed on screen.Next, the frequency and channel number corresponding to the channel plan selected aswell as the satellite downlink frequency. Finally, it shows the status line (similar to themeasurement screen).Page 68 01/2011