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24 MPEG-2 Encoder
Instruction Manual
5.9 "Main > QAM" Screen
The "Main > QAM" screen (Figure 5.9) is a "read and write" screen to assign QAM parameters to the TS:
Output Channel/Frequency: must assign an RF channel number to the RF QAM output of the QAM module (i.e. RF
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channel 50, as shown in Figure 5.9). The range is CATV channels 2 to 158.
The RF Channel number will be displayed on TV only if the source stream does not carry any
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Output Control: allows the user to turn the RF channel On/Off.
CW Control: allows the user to switch the QAM output mode to CW (Continuous Waveform) which activates an
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analog carrier at the selected channel's center frequency; this is typically used in level adjustment of the system.
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Final Output Level: must select the QAM RF output level for the output. The range is 32 to 42 dBmV. It is
recommended to maintain the output level at 40 dBmV for normal operation.
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Output QAM Mode: must 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.
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Output QAM Map: must select the desired QAM Map. Possible options are STD, IRC, and HRC.
Output QAM Data Rate: indicates the maximum data rate depending on the selected QAM mode, for example
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5.3605 Mbaud for QAM 256B.
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Output QAM Interleaver: indicates the interleaver value for the QAM mode.
Output QAM Alpha: indicates the Alpha value for the QAM mode
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QAM Lock State: indicates whether QAM module is working properly (locked) or not.
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NOTE: The module may take a few seconds to lock when QAM output parameters are changed.
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Figure 5.9 - "Main > QAM" Screen
Remember to click on the SAVE button to apply the new values/configurations.
virtual channel number.
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