GSS HDE 400, Assembly Instruction Manual, Page: 30 / 50

- 30 - HDE 400
Cofdm
outPut signal
—> This menu is only be displayed if "COFDM modulation" is selected
in menu "RF output" (page 23)!
If "QAM modulation" is selected please continue with submenu "Sub-
stitute signal in the case of an incorrect input signal" – "
FAILURE "
(Page 33).
In this menu, you can set the bandwidth, the carrier modulation and the spectral
position of the output signal.
Bx 2
8MHZ QAM64 COFDM
POS
Bandwidth 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.
• Use to set the bandwidth of the output signal (" 5 MHz " … " 8 MHz ").
Carrier modulation
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 ").
Spectral position – inverting 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.