Quantum Receiver User Manual
Receiver Installation & Setup
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The devices can be used passively or powered via the Demodulator connection.
To turn on the power, if required, to the down-converter, turn the appropriate
LNB Power setting to On.
The Local Oscillator (LO) frequency of any unlisted down-converter can be
selected using the OTHER option. The polarity can be set to take into account
low- or high-side mixing in the down-converters.
7.7.
Configuring Demodulation
The demodulator in the receiver can operate in three main operating modes:
DVB-T
Single Pedestal LMS-T(S)
Dual Pedestal LMS-T(D)
NOTE: In LMS-T(D) mode, the bandwidth shown is the combined width of the
2 pedestals.
The LMST pedestal widths available are 3, 4, 5, 6, 7, 8, 10 & 12MHz. In Dual
pedestal mode the effective width is therefore double that. This means that in
some channel widths the system could be used in single or dual mode (e.g. 1 x
10MHz or 2 x 5MHz). The overall throughput will be the same, but this allows
the RF performance to be optimised for particular operating environments.
NOTE: There is a short delay (approx 10s) after switching modes before the
unit is fully reconfigured.
7.7.1.
DVB-T Operation
The following procedure defines the changes and sequence required when
changing to DVB-T operation. Configure these settings using the
Settings>RF>Modulation menu option, see
Section 6.3.1.1 Modulation:
1.
Set Frequency Mode to Direct or Channel Plan.
2.
Set the Modulation Type to DVB-T.
3.
Set the Bandwidth to Auto.
4.
Set Guard Interval to Auto.
5.
Set Polarity to Auto.
6.
Set Frequency as required.
The table below defines the corresponding gross bit rates for DVB-T operation.
This includes video, audio, data and other Transport Stream data tables.