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TV EXPLORER HD / HD
USER'S MANUAL.
C)
Satellite band, analogue carrier
Carrier level is measured using a quasi-peak detector (4 MHz BW). Noise level is
measured with an average detector (230 kHz) and corrected to refer it to channel
bandwidth.
D)
Satellite band, digital carrier
Equivalent to case B but now using the 4 MHz BW filter.
On selecting the
following information:
Figure 26.-
As well as the video carrier / noise level ratio (
frequency or channel (depending on the tuning mode selected) and the level of the video
carrier and video/audio ratio are also shown. When representing the spectrum by means
of pressing
[13] key, the NOISE cursor is automatically positioned to a side of the
carrier tuned. That is, the cursor will indicate the point where the value of the noise is
lower, whenever the C/N(AUTO) option is selected from the
menu. If the C/N(MANUAL) option has been activated the frequency where noise level
will be measured will correspond to the position of the vertical discontinuous green-
coloured cursor that appears in the spectrum graph
In order to modify this frequency, press the
[17] key, to accede to the
[1], locate the NOISE cursor on the position of the marker using
option (see section "5.16.1 Markers") or directly enter the value of the new
MARKER
noise frequency by means of
10/2012
LE
Carrier / Noise
measurement mode the screen displays the
Carrier-to-noise ratio measurement (
CONFIGURATION
option.
NOISE FREQ
C/N
).
C/N
) (41.0 dB in previous figure), the
PREFERENCES
[13].
measurement configuration
menu. By turning the rotary selector
NOISE FREQ. TO
[22]
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