22
AQM - Agile QAM Modulator
Programming a Variable
1. When a user arrives at a screen whose variable needs to
be changed, the user depresses the ENTER button until the
blinking cursor is displayed.
2. After the blinking cursor is displayed the user simply presses
the
▲
(UP) or
▼
(DN) arrow buttons to increment or
decrement to the appropriate desired value.
3. When the user reaches the desired setting the ENTER button
is pressed again to save the change, then the corresponding
AQM module stores the new information.
Interactive Sequence Detail
QAM Mode
The AQM can be set to comply with the ITU-TJ-83 Annex A &
Annex B specifications.
ITU-A - is used for DVB operation
ITU-B - is used for DigiCiper II operation
Encoder
The Encoder selection is only used in ITU-A Mode. If set to ITU-B
Mode, then the Encoder shows NONE.
QAM
The QAM modulation type is user selectable. If the unit is set to
ITU-B Mode, then only QAM 64 or 256 are available.
Alpha
The Alpha setting is used to set the roll-off factor. Settings are
typical depending on the Operation Mode. The standard settings
are as follows:
ITU-A - 15%
ITU-B - 18%
Summary of Contents for AMM-806
Page 86: ...79 TVCB PC Installation ...
Page 93: ...86 SMI Installation Torque Patterns 1 Start Here 2 3 4 5 6 1 Start Here 2 3 4 4 PORT 8 PORT ...
Page 125: ...118 Fiber Optics Fiber Loss vs Path Length Single Mode 1550 nm ...
Page 156: ...149 Cable TV Channel Format NTSC NTSC Composite Video Waveform ...
Page 157: ...150 US Frequency Spectrum ...
Page 158: ...151 FCC Aeronautical Band Frequencies Used for Communication and Navigation ...
Page 175: ...168 Common CATV Symbols ...
Page 176: ...169 Common CATV Symbols ...
Page 177: ...170 Digital L Band Distribution Symbols ...
Page 178: ...171 Digital L Band Distribution Symbols ...
Page 183: ...176 Typical Cable Attenuation Chart in dB 100 Feet 68 F 20 C ...
Page 187: ...180 Echo Rating Graph ...
Page 188: ...181 Signal to Interference Limits Non Coherent Carriers ...
Page 190: ...183 Heterodyne Modulator Analog ...
Page 191: ...184 Heterodyne Processor Analog ...
Page 213: ...206 Multiplexers ...
Page 285: ...Rev 8 0 ...