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For ASTRA and EUTELSAT receiving systems, this is normally
9.75 GHz (9,750 MHz) for the lower frequency range (low band) and
10.6 GHz (10,600 MHz) for the upper frequency range (high band). Older
receiving systems still use a 10 GHz oscillator frequency in the low
band range (which usually are not suitable for digital reception).
The receiver generates the frequency to which it needs to adjust by
subtracting the oscillator frequency from the satellite transmission
frequency saved for each programme. You only have to set the
oscillator frequency used by your reception system. Before chancing
the LO frequency, you must therefore ascertain whether this is actually
necessary.
The oscillator frequencies listed in the text above are set in the factory.
Changing the Oscillator Frequency
Use the
key to switch to the “LNB Confi guration Menu” on the right-
hand side. The setting for “L.O. High” is highlighted in colour. You can
now use the number keys to enter a new frequency appropriate for
your system. This also applies to the “L.O. Low” setting. This is reached
using the
keys.
You can exit the menu by pressing
four times; this also confi rms
the saving of the set value. If you make an incorrect setting, you will see
the following message: “Poor or no signal”.
Operation
The factory setting is “On”. Select using the
keys.
Under normal circumstances, the supply voltage should be turned on.
For community antenna systems, you must ascertain whether the
supply voltage needs to be turned off.
Standby
The factory setting is “Off”. Select using the
keys.
Under this option, you can turn the supply voltage for the LNB on or off
in receiver standby mode. For single and community antenna systems,
it can be turned off.
If your receiver is connected to a multi-feed antenna, which is aligned
with the HOTBIRD satellites for example, you must change the receiver
settings for the
DiSEqC™(Digital Satellite Equipment Control)
signal.
This also applies to other satellites.
Different control signals are required to select the satellite signals.
However, the input frequency range for the receiver is in the range
950 to 1250 MHz. The high frequencies are therefore converted into a
lower frequency using the oscillator frequency (LO frequency/L.O. = local
oscillator, “LNB local oscillator”). Different oscillator frequencies are
used for the conversion depending on the satellite frequency range and
the system type.