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FFT Mode: Selection of the required FFT value (number of carriers in the COFDM
ensemble). The modulator has these options:
• 2K
• 8K
Spectral Inversion: This function allows inversion of the spectrum generated in IF
and RF. As the IF spectrum is by itself inverted compared to the RF output, the
inversion applied is related to the RF output. The possible options are:
• OFF: Carriers with lower indices occupy the lower frequencies of the RF
channel.
• ON:
Carriers with higher indices occupy the lower frequencies of the RF
channel.
PRBS bits: Selection of the length in bits of the internally generated
pseudorandom sequences:
• 23:
PRBS sequences of length 2²³-1 as documented in TR 101 290.
• 15:
PRBS sequences of length 2¹⁵-1 as documented in TR 101 290.
TS sync mode: Selects the mode of operation of the modulator with respect to the
incoming TS (see section 1.2 for further details):
• Master
• Slave
Slave mode TS lock: In slave mode, this selects the TS input to which the
modulator locks its internal clock. Options are:
• HP:
The modulator is synchronised with the HP TS.
• LP:
The modulator is synchronised with the LP TS (hierarchical modes only).
4.5
RF functions
The selection of this item allows us to access those functions related to the RF
output. Let's review each option.
Frequency: This function allows the selection of the RF frequency. Changes made
by turning the rotary encoder are applied directly to the output, allowing for a
smooth tuning of the output frequency.
Page 20
USER'S MANUAL. MO-16X
04/2008
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