User`s manual

User’s Manual - mediaMAX MINI

ENGLISH

Reserved of technical modiﬁ cations and/or errors

rev 2.1

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.