Triax CCS-2 1002, Руководство по сборке

Страница: 30 / 45

- 30 - CCS-2 1002
o
utPut signal
In this menu, you can set the bandwidth, the carrier modulation and the spectral
position of the output signal.
Bx 4A /B
8MHz QAM64
COFDM-MODE
POS
b
andwidth of the outPut signal
To transmit the output signal in the channel range of C21 to C69 a bandwidth
of 8 MHz can be used.
In the channel range of C5 to C12 a bandwidth of ≤ 7 MHz must be set.
If frequency setting is selected you can set the bandwidth dependent on the
frequency of the adjacent channel.
Bx 4A /B
8MHz QAM64
COFDM-MODE
POS
• Use to set the bandwidth of the output signal (" 5 MHz " … " 8 MHz ").
C
arrier modul ation
In this menu item the carrier modulation is set. At this the setting " QPSK " corre-
sponds to the lowest and the setting " QAM64 " to the highest output data rate.
• Use the buttons to place the cursor under " QPSK / QAM… ".
• Set the carrier modulation of the output signal using the buttons
(" QPSK ", " QAM16 ", " QAM64 ").
i
nverting the user signal
For exceptional cases and "older" digital cable receivers, the spectral position
of the user signal can be inverted "
NEG ". The default setting is " POS ".
• Use to place the cursor under " POS ".
• Use to set the spectral position to " NEG ".
• Press the button.
—> The "Transmission parameters" – " COFDM-MODE " menu is activated.