Promax HD Ranger + User Manual download pdf (Page 68)

March 2015 7-61

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7.2

Echoes

7.2.1

Description

The Echoes function shows the response in time of a digital terrestrial channel

and therefore it can detect echoes that can occur due to the simultaneous

reception of the same signal from several transmitters with different delays and

amplitudes.

Another cause that may cause echoes is reflection of the signal on large objects,

as buildings or mountains. This may be the explanation that having a good C/N

and a good signal, the BER does not reach the minimum value.

With the Echoes function is possible to know the distance from where the

equipment is to the transmitter or the object that caused the echo. Thus, the

installer can minimise the effect that the echo may cause on the installation,

reorienting the antenna and reducing the effect of received echoes.

This function is only available for DVB-T, DVB-T2 and DVB-C2. Therefore,

previously have to configure the equipment for the reception of such signals.

7.2.2

Operation

Echoes function is available for DVB-T, DVB-T2 and DVB-C2 signals.

Connect the RF input signal to the equipment.

Tune a DVB-T, DVB-T2 or DVB-C2 digital signal at the terrestrial

band.

Enter the MEASUREMENT mode or SPECTRUM mode .

Press the key (Tools).

Select ECHOES.

The ECHOES function of the tuned signal appears on screen.

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Promax HD Ranger + User Manual Page 68