Markers; Echoes Analyzer (Cofdm) - Promax TV EXPLORER HD Manual De Usuario

USER'S MANUAL. TV EXPLORER HD

5.15.1 Markers

(Only in Spectrum Analyser mode). The marker in red colour indicates the central
frequency or tuning frequency, which can be moved by means of turning the rotary
selector [1] as well in channel as in frequency tuning mode
When monitoring a digital signal spectrum also appears two additional markers in
white colour, which indicate the bandwidth of the digital channel (See previous Figure).
If the highlighted measurement which appears on the measurement screen
corresponds to C/N, the Spectrum Analyser mode will measure the C/N ratio at the
frequency indicated by the marker and a second marker will indicate the frequency for
the noise measurement.

5.16 ECHOES Analyzer (COFDM)

The ECHOES function can detect and display echoes that may appear when
receiving simultaneously the same signal from several transmitters. Another reason that
can cause echoes is the reflection of the signal on large objects such as buildings or
mountains.
With the ECHOES function is possible to know the distance from where we are to
the transmitter or the object that has caused the echo. Thus, the installer can minimise
the effects of echoes on the facility. Knowing echoes, the installer is able to reposition
the antenna and therefore, reduce the effect of echoes received.
This feature is only available for DVB-T / H signals. Therefore, you should
configure the TV EXPLORER
ECHOES function will not appear on the menu "Utilities".
The steps to go through to set up the digital terrestrial reception are the next:
1. Press the key
terrestrial frequency band.
2. Press the key
measurement mode for Digital TV.
3. Check the led indicator "D" and the led indicator "T" are lighted.
11/2009
HD in order to receive this type of signals. If not, the
[14] (Satellite / Terrestrial Band) to select the TV
[17] (Measurement Configuration) to select the
[24].
Page 65