MAC AV-COFDM Uživatelský manuál stáhnout pdf (Strana 15)

Signal settings/Output

3) To load a new NIT le click on the option LOAD NEW FILE in the lower part of the

screen. A new window lets you select the location and the name of the NIT le that you

wish to load.

NOTE

The model NIT option lets you combine the NIT information of the unit with an

external NIT, resulting in a combined NIT of both sets of information. If the TSIDs

coincide, they are replaced by those of the unit.

Output

1) Select the SETTINGS menu and then the OUT-

PUT submenu.

The RF OUTPUT tab displays the conguration

parameters of the output signal radio frequency and

lets you modify it for exible setting in the output of

the unit.

PARAMETERS:

FREQUENCY: displays the output frequen-

cy of the current radio frequency carrier and

allows you to modify its value (directly on the

value eld or increasing or decreasing unit

by unit using the buttons to the left of the

eld). The frequency value must be within

the valid range for the VHF or UHF bands.

OFDM MODE: congures the OFDM mode by selecting from the values 2K and

8K.

BANDWIDTH: congures the bandwidth by selecting from the values 6, 7 and 8

MHz.

GUARD INTERVAL: congures the guard interval by selecting from the values 1/4,

1/8, 1/16 and 1/32 of symbol.

CONSTELLATION: congures the constellation of the output modulation by se-

lecting from the options 16QAM and 64QAM.

CODE RATE: congures the redundant code rate by selecting from the values 1/2,

2/3, 3/4, 5/6 and 7/8.

ATTENUATION: congures the attenuation for the radio frequency carrier signal

to the output using a sliding bar to vary this value within the range of 0dB to 47 dB.

MAX BIT RATE: reports the maximum binary data speed in the output of the unit.

NULL PERCENTAGE: reports on the percentage of binary data in the output

without information.

MINIMUM C/N (THEORETICAL): reports the minimum theoretical carrier to

noise ratio in the output.

TEMPERATURE: displays the operating temperature in the unit.

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MAC AV-COFDM Uživatelský manuál Strana 15