GSS PROFESSIONAL PSCU 6000, Руководство по сборке, Страница: 22 / 26

- 22 - PSCU 6000
6 P
ut the Cassette into oPeration
(
Channel searCh
)
To ensure a high measurement accuracy for the channel search, the cassette
must be in operation for about 30 minutes.
• Connect a TV set or a test receiver to the measuring output of the cassette
or to the HF output of the head-end station and tune it to the channel set (in
the programming example "
C21 ").
• To create the info display press the " START/SEARCH " button (see page 13) for
approx. 10 seconds
—> During the search function, the operation display " LED " is flashing.
The search function can take up to 10 minutes.
The channel search starts with the analog TV channels in ascending
channel order:
C2 … C4, S2 … S10, C5 … C12, S11 … S41 and C21 … C69.
As criteria for the analog TV channels, the synchronization pulse
and the HF level are used. The station name is determined via the
VPS identification signal. The HF level is measured and stored as ref -
erence value for the control function. For analog TV channels with -
out VPS identification signal, blanks are entered as station name.
Picture on the display (menu setting " extended "):
C 27 Seite 1/1
Kanal Name BER dBµV
C 27 BR-3 93
In the footer of the OSD menu the channels, the current page (Seite)
and the number of pages are displayed.
When the search for analog channels is completed, QAM chan -
nels in the frequency range of 306.00 MHz to 858.00 MHz are
searched in steps of 8 MHz.
The criteria for QAM channels are the signal level and the fact that
the tuner "locks" on one of the different modulation modes and
symbol rates. The centre channel frequency, the symbol rate, the
bit error rate (BER) and the signal level are measured and stored as
reference values for the control function.