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Spectral Menu
70
Selecting the spectrum representation
By pressing this button, the represented frequency range can be defined per scale
unit. The following settings are possible:
Setting SAT operation TV operation Return path op-
eration
RADIO opera-
tion
Span/DIV BW Span/DIV BW Span/DIV BW
large
100 MHz 8 MHz 20 MHz 1 MHz ------- -----
med.
20 MHz 1 MHz 5 MHz 1 MHz 5 MHz 1 MHz
small
5 MHz 1 MHz 1 MHz 200 KHz 1 MHz 200 K
full
-------- ------- 100 MHz 8 MHz ----- -----
2 MHz
No selection
possible
BW 200 KHz
ANALOG marker
The marker can be used or level measurements of analogue carriers in repre-
sented spectrum on the screen; here, the marker is placed on the carrier. A yellow
triangle in the screen shows the position of the marker. With the cursor buttons,
◄►, the position of the marker can be determined. The frequency and level dis-
play of the marker appears on the upper margin on the screen. The level difference
(C-M) to the white marker (carrier) is displayed on the lower margin of the screen.
DIGITAL marker
Press the same softkey. The upper display changes from A to D (digital measure-
ment). With the cursor buttons ◄►, the position of the marker can be set. The fre-
quency and level display of the marker appear on the upper margin of the screen.
The level difference (C-M) to the while market (carrier) is displayed in the lower
margin of the screen.
For the establishment of digital levels, the MSK 33 calculates a correction value,
which is represented by a thin line under he yellow marker,. This value is influ-
enced by the respective set spectrum measurement bandwidth (see below) and the
symbol rate.
Therefore, observe the correct setting of the symbol rate in the TV and Sat menu!
For DVB-T, the appropriate channel bandwidth (6, 7 or 8 MHz is set in the TV
menu.
The scale on the left margin of the screen serves for orientation in the digital opera-
tion. The level of a digital carrier can only be determined with the white or yellow
marker!
C/N measurement of analogue signals in Sat operation
The spectrum menu is opened in the setting, analogue reception. The yellow
marker is shifted between the two carriers or in a frequency gap. The C/N meas-
urement is carried out in medium or small span.
The softkey (yellow marker) must display the setting „dig.“
For noise bandwidth matching, the symbol rate (for DVB-T chBW) set in the SAT or
TV menu is used. It must have been set for the C/N measurement in the SAT
range to 27.5 MS and in the TV range to 6.9 MS (at DVB-T to7 or 8 MHZ).
Carry out the C/N measurement for the satellite reception directly behind the LNB.
For systems with cable slope, the measurement result can be incorrect, if the C/N
measurement occurs for subscriber connection.
The C/N value is displayed now in the right-hand corner (C-
M) on the TFT display.
☞
marker
ana.
marker
dig.
marker
dig.