Fracarro SIG7120 Instructions D'emploi page 25

COFDM
(OUTPUT)
Select the Forward
Error Correction
Select the guard
interval
Select the number
of c arriers
Select the
constellation type
Select the
spectrum type
Select the output
level
Select the singletone
The following is the COFDM (OUTPUT) menu in detail:
For the correct use, see paragraph 5. "INDICATIONS FOR PROGRAMMING".
OUTPUT FREQ. – sets the output frequency according to the channel (setting the country and the output chan-
nel) or according to the MHZ frequency (setting the bandwidth and the MHz frequency).
FEC – sets the parameter relevant to FEC (Forward Error Correction) among the possible choices (1/, /3, 3/4,
5/6, 7/8).
GUARD INTERVAL – sets the guard interval among the possible choices (1/4, 1/8, 1/16, 1/3).
CARRIERS NUM. – sets the number of carriers between K and 8K.
CONSTELLATION – sets the constellation, QPSK, 16QAM or 64QAM, with which the carriers are modulated.
SPECTRUM – regulates the spectrum as NORMAL or REVERSED according to the reception instrument that
might work only in one of the two modes. Usually the "NORMAL SPECTRUM" setting is used.
LEVEL – regulates the output level on a scale between 0 and 15 to which a STEP equal to 1dB corresponds.
Setting the level to OFF, the output signal is disabled. The OFF output level can be set only during the normal
operation and not when the SINGLETONE function is activated.
SINGLETONE – allows the use of a single tone at the input to facilitate the measurement of the output level.
When the SINGLETONE function is activated, no other channels can be inserted.
5.1.5 COFDM (OUTPUT) MENU
Select the output
frequency
SEL. BY
OUTPUT FREQ.
FREQ.
SEL. BY
CHANNEL
FEC 1/2
GUARD INTERVAL 1/4
CARRIERS NUM. 2K
CONSTELLATION QPSK
SPECTRUM NORMAL
LEVEL OFF
SINGLETONE OFF
Confirm the settings by pressing the
pressing the S key after the modules programmation.
BANDWIDTH
6
FREQUENCY (MHz)
COUNTRY
Europe
OUTPUT
S2
CHANNEL
1/2, 2/3, 3/4, 5/6, 7/8
7/8
1/4, 1/8, 1/16, 1/32
1/32
8K
QPSK, 16QAM, 64QAM
64QAM
INVERTED
OFF, 0, 1, 2, .., 15
15
ON
key; save the settings by
5
6 MHz
7 MHz
8
8 MHz
111 862
Europe
France
UK
Australia
S2-E69
E69