Promax MO-170 Manual De Instrucciones página 66

Guard Interval: This function selects the required guard interval for the COFDM
signal. The available values are:
• 1/4
• 1/8
• 1/16
• 1/32
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).
Page 18
USER'S MANUAL. MO-170
12/2006