mediaMAX MINI - Fte maximal

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ENGLISH 104 User’s Manual - mediaMAX MINI The impulse response function allows monitoring the carrier power distribution during a period of time, while the frequency response function allows monitoring the digital C/N of each one of the DVB-T carriers. In order to access to the tools of DVB-T, press key 8 “tool” and select “DVB T” option. A new menu with the following tools will appear: 17.4.1 Monitor mode This menu option is a screen of measures. It shows some additional measures of the digital terrestrial television signal. The additional measures are: Guard interval Mode: bearer number HRCH: Hierarchy Cell Id: Parameter about operators. 17.4.2. Frequency response The frequency response function allows monitoring the digital C/N levels for each DVB-T carrier. In fact the echoes can also be seen with the frequency response, but the interpretation is different. The EDM feature shows the interference level that is produced by an ECHO in the tuned multiplex. Reserved of technical modifi cations and/or errors rev 1.5
ev 1.5 User’s Manual - mediaMAX MINI Thanks to this feature we can detect easily if our installations receives any kind of rebound (ECHO) and if this is interfering in the quality of the tuned channel. For this reason the EDM feature shows a percentage (%) of the interference level of the signal that is received with delay regarding the tuned channel. The following screenshot shows the frequency response for a near perfect DVB-T carrier, where all the carriers have a similar level, remaining almost hidden. We can also see how the EDM variable keeps at 0% when it does not detect any ECHO in the tuned multiplex. The frequency response is almost fl at for all the carriers (6816 carriers for an 8k DVB-T) in the above screenshot. This means that the digital C/N for all the carriers is very good. The following screenshot shows the frequency response for a carrier with a delayed signal of 2us and with similar power than the main carrier. For this case the EDM value is 100%, which shows that the ECHO is affecting noticeably the received signal. The above screenshot shows the typical behavior of the frequency response when a clear echo is present. Reserved of technical modifi cations and/or errors 105 ENGLISH
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