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HDE-8C-QAM
Instruction Manual
Output Channel/Frequency:
user must assign a RF channel number to the RF QAM output of the Quad-QAM module
(i.e. RF channel 50, as shown in Figure 6.11.2). The remaining three RF QAM channels will be automatically assigned
to the next adjacent channels (i.e. RF channels 51, 52, and 53). The range is NTSC channels 2 to 155.
Output Control:
turns each of the 4 RF channels On/Off.
CW Control:
allows the user to switch the QAM output mode to CW (Continuous Waveform) which activates an analog
carrier at the selected channel’s center frequency; this is typically used in frequency alignment of the system.
Output Level:
must select the QAM RF output level for the output. The range is 35 to 45 dBmV. It is recommended to
maintain the output level at 40 dBmV for normal operation.
Output QAM Mode:
allows user to select the desired QAM modulation mode. Possible options are: 64B, 256B, 16A,
32A, 64A, 128A, and 256A. For most applications in the USA, the recommended QAM modulation mode is 256B.
Output QAM Map:
allows user to select the desired QAM Map (channel/frequency plan). Possible options are STD,
IRC, and HRC.
Output QAM Data Rate:
indicates the maximum data rate depending on the selected QAM mode, for example
5.360500 Mbaud for QAM 256B.
Output QAM Interleaver:
indicates the interleaver value for the selected QAM mode.
Output QAM Alpha:
indicates the Alpha value for the selected QAM mode.
QAM Lock State:
indicates whether Quad-QAM module is working properly (locked) or not.
NOTE:
The module may take a few seconds to lock when QAM output parameters are changed.
The RF Channel number will be displayed on TV only if the source stream does not carry any
virtual channel number.
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Remember to click on the SAVE button to apply the new values/configurations.
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