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Chapter 7 - TV Measuring Range
106 V3.2
Symbol rate input
7.2.2.1.1
You must set the corresponding symbol rate before a DVB-C (QAM) signal can be received.
Figure 7-5 Symbol rate setting
First select menu item
SYMBOLRATE
. A drop-down menu with three symbol rates then appears.
Select the desired symbol rate using the
↑/↓
arrow keys. Activate it by pressing
ENTER
or select
the
→
arrow key to access an input menu. You can now enter the new symbol rate in kBd using
the numeric keypad or with the arrow keys. Press
ENTER
to store this setting.
For reference: 6,900 kBd = 6,900 kSym/s = 6.9 MBd = 6. 9MSym/s
The symbol rate can be set in the range 1000 kBd to 7,200 kBd.
Automatic symbol rate detection:
The measuring receiver uses the set symbol rate as the starting point for automatic detection. As
soon as you enter a new channel, the receiver attempts to use the set symbol rate to demodulate
the signal that is present. If this is not successful, it uses the symbol rates 6,111 kBd, 6,875 kBd or
6,900 kBd for additional attempts.
Scan
7.2.2.1.2
You can use this function to scan the entire TV range for DVB-C signals.
For this, you must switch the instrument to channel input mode.
The scan function includes automatic detection of modulation schemes and symbol rates.
That means that the instrument scans every channel with 64QAM, 128QAM and 256QAM and the
symbol rates 6,111 kBd, 6,875 kBd and 6,900 kBd.
