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Quantum and Evolution Series Installation and Operating Handbook
Edit-Rx-Carrier-Advanced PCMA Menu
This menu has the following options:
•
Enable. This is used to switch Paired Carrier off and on. Access to this menu option
requires the Paired Carrier feature to have been previously enabled through the
modem SAF mechanism.
•
Round trip delay. This allows the option of setting the satellite round trip delay either
by entering positional coordinates for the modem (earth station) and the satellite or
alternatively setting an absolute delay. The delay is required in order for the Paired
Carrier signal processing algorithm to find a best match for its stored copy of the
outgoing transmitted signal with the composite return signal, in order to subtract the
unwanted near signal leaving just the far carrier.
Edit-Rx-Carrier-Advanced-PCMA Enable Screen
PCMA enable:
This is used to switch Paired Carrier off and on. Access to this menu option requires the
Paired Carrier feature to have been previously enabled through the modem SAF
mechanism.
For first-time use please see the Paired Carrier deployment recommendations in
the information box overleaf.
When switched on, the modem expects the received signal to consist of two overlapped
carriers utilizing the same space segment. When on, a copy of the modem's transmitted
signal will be stored in memory and the Paired Carrier signal processing algorithm will
attempt to match this with the composite return signal, in order to subtract the unwanted
near signal leaving just the far carrier.
Prior to enabling Paired Carrier it is necessary to set up the delay to satellite as in the
following menu options.
Note that there are no other control settings that are specific to Paired Carrier operation –
other settings used by the Paired Carrier algorithm such as centre frequency and sweep
PCMA:
1:Enable
2:Round trip delay
[Off]
1: Off
2: On
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