Blonder tongue AMM-806, Справочное руководство

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14
AQD - ATSC/QAM Demodulator
Variable Details
DEMOD MODE:
The AQD is capable of locking to a terrestrial (off-
air) 8VSB or CATV QAM Annex B modulated RF input signal. The
selection of the appropriate signal type must be made by the user
to ensure signals are properly identified during a scan. By setting the
Demod Mode the Channel Plan is automatically set to Broadcast for
8VSB signals and Standard CATV for QAM signals or 8VSB signals on
the CATV channel plan.
CHANNEL PLAN: The Channel Plan mode allows the user to the
select the appropriate frequency mode. This setting alerts the user to
the appropriate center frequency plan the AQD will use during the scan
process.
• The Broadcast option must be selected for off-air 8VSB reception, this
is automatically set if the Demod Mode is set to 8VSB. Reception is
limited to VHF & UHF center frequencies.
• The Standard CATV mode is capable of locking to QAM Annex B and
8VSB signals. This channel plan is automatically set when the QAM B
mode is selected in the Demod Mode command menu. Reception is
limited to CATV center frequencies.
o It is only required to choose the HRC or IRC option when these
frequency off-sets are used with the CATV plan.
➣
NOTE: See Appendix for additional details.
SCAN MENU:
The scan menu command allows the AQD module to
auto search for available programming. It is required that each module
perform a scan in order to function properly. All modules will perform a
scan when the Scan All Modules command is selected.
•
YES –
The YES Command performs a scan on only the selected
active module
•
ALL MODULES –
The ALL MODULES Command performs a new
scan on all of the installed modules
•
STATUS –
The STATUS Command displays the channels found
during the scan process for the selected active module
•
STOP SCAN –
The STOP SCAN Command permits an operator
to stop an in-process scan. It is important to note that once a scan
starts the previously found channel data is immediately erased. If
the scan is stopped, only the completed scan channel data will be
available for selection
•
EXIT –
The EXIT Command exits the scan menu without making
any modifications