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4.2.3.1
CHANNEL tuning
4.2.3.1.1
Video carrier + V/A + C/N measurement (only for analogue
channels)
If the tuned channel has been defined as
analogue by means of the Edit Channel Plan
function (see section 4.2.1 Global Configuration
PROMAX-10
Menu), the
screen as the one shown in the attached figure.
The tuned channel (C69 in the figure)
appears in the higher left hand corner; this may be
changed by turning the rotary selector [9]. At its right
appears the frequency (855.25 MHz) and the active
channel plan (CCIR in the figure).
Below is shown the video carrier level, VIDEO Carrier (80 dBµV in the
example). The units of measurement may be changed using the Global Configuration
Menu (section 4.2.1). At the bottom, a bar-graph displays the level with a resolution of
1 dB.
Also the ratios between the video and the audio carriers (V/A) and the
video carrier and noise (C/N) are shown. The example in previous figure shows a
channel with a Video/Audio ratio of 16 dB and a C/N ratio of 54 dB.
4.2.3.1.2
Audio carrier measurement and demodulation (only for
analogue channels)
PROMAX-10
For the
demodulate an audio signal and
show its characteristics (level and
frequency offset), press the rotary selector [9]
again. In the attached figure, the audio carrier level
(AUDIO Carrier) is 64 dBµV and the frequency
offset is 5.50 MHz ( F). It also shows if the audio
(whether Level, FM or AM) is activated (a speaker
appears) or not (the speaker does not appear). To change the audio carrier offset ( F)
and the audio modulation (Level, FM or AM) access to the Channel-Frequency
configuration menu (section 4.2.3.3).
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USER'S MANUAL.
PROMAX-10
Figure 15.- V/A and C/N Level
measurement.
Figure 16.- Audio demodulation
and measurement.
SE
07/2011
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