Promax HD RANGER, Руководство пользователя

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6.3 Echoes
6.3.1 Description
The Echoes option 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 Echo 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 and DVB-T2. Therefore, previously
have to configure the apparatus for the reception of such signals.
6.3.2 Operation
Echoes function is available to DVB-T and DVB-T2 signals.
Connect the RF input signal to the equipment.
Tune a DVB-T or DVB-T2 digital signal at the terrestrial band.
Enter the MEASUREMENTS mode and SPECTRUM mode .
Press the F3 key (Utilities).
Select ECHOES.
The ECHOES function of the tuned signal appears on screen.
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