Promax PROLINK-4 Manual De Instrucciones página 186

To modify the bandwidth access the TV mode functions menu and select the
Channel BW function, press the rotary selector [4] to activate it. The CHANNEL
BANDWIDTH screen will be displayed. To alter the bandwidth value press key
[31], the bandwidth will disappear and, using the keyboard, you will be able to enter the
new digital channel bandwidth in MHz and with two decimals.
4.9.4.12 LNB Local Oscillator Frequency (Lnb local osc)
This option only affects reception of satellite band signals when using the channel
tuning mode. This function defines the LNB local oscillator frequency used in the
installation where the PROLINK-4 has been connected. Given that the PROLINK-4
satellite channel tables have been defined in the Ku band and the PROLINK-4 tunes in IF
(like all satellite receivers) the LNB local oscillator frequency has to be defined to correctly
tune the channel mode.
To modify this parameter access the TV mode functions menu (satellite band),
turn the rotary selector [4] to the Lnb local osc function and press to activate it. The
monitor will show a screen labelled LNB LOCAL OSCILLATOR displaying the current
value of the LNB local oscillator frequency. To alter this value press key
current value will disappear and the new value can now be entered using the keyboard.
The frequency of the LNB local oscillator is expressed in MHz, with 5 figures for
the whole part, a decimal point and a decimal figure (which acts as confirmation). For
example, to select 9 GHz the number 9000.0 has to be entered. Values must be defined
between 8000.0 and 12000.0.
4.9.4.13 Video Polarity
This option affects reception of SAT (satellite) band signals. It allows selection
of either negative and positive video polarity.
To modify the polarity access the TV mode functions menu (satellite band),
select the Video Polarity function, and press the rotary selector [4] to activate it. The
monitor will show a screen labelled POLARITY displaying two possibilities: Positive
Video and Negative Video. Turn the rotary selector [4], mark the option you require
and finally press to activate.
4.9.4.14 Verification of distribution networks (SAT IF Test)
This application allows to verify easily the TCI features (Telecommunications
Common Infrastructures) before the antennas and the head-end devices are operative.
The procedure allows to evaluate the frequency response of a whole FI distribution
network by means of two steps:
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USER'S MANUAL. PROLINK-4
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02/2003