Chapter 6 - TV Measuring Range
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6.5
Blind Scan
This function can be used to determine the channel configuration in an unknown cable network.
The measuring receiver scans the specified frequency range for ATV, DVB-C and DOCSIS signals.
The instrument creates a channel list, which is displayed on the TFT during the scan. Once the
function is complete, the list can be transferred in the tuning memory, saved as a XML file or
exported as a CHA file. The latter file format can then be further edited in the PC software AMA
Remote and imported into the instrument as a user-defined channel table.
6.5.1
Starting a new scan
Via
MODE -> BlindScan
you can access the following menu.
Figure 6-26 BlindScan start menu
Here you can set the parameters for the scan.
You can move the cursor to the individual entry fields using the ↑/↓ keys. You can specify the
upper and lower limits for the scan entering the items
Starting at
and
Stopping at
. The entire TV
range can be used.
Using the
F1-F4
soft keys, you can select which signals to include in the scan. To start the function,
move the cursor to “START” and then press the
ENTER
key.
In the figure above, the instrument is set to perform a scan from 109 to 868 MHz. The minimum
measurement increment is always 250 kHz. The measuring receiver will search for analog TV
programs and for DVB-C channels.
For DVB-C, the common symbol rates of 6,875 kBd and 6,900 kBd are measured with the
modulation schemes 64QAM and 256QAM. For DOCSIS, 64QAM and 256QAM are used. The
symbol rate is permanently coupled to the modulation.
6.5.2
Aborting a scan manually
You can follow the progress as the instrument carries out the function.
