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12 Spectrum analyzer
Pressing SPECTRUM gives access to the SPECTRUM ANALYSER function. (graphical representation
frequency / amplitude of the present signals in the input of the device)
2 predefined bandwidths are available: terrestrial and satellite.
To swap from satellite to terrestrial, press the key, as shown on the bottom side of the screen.
The input attenuator is automatically tuned according to the level of the signals measured.
Filters are automatically selected according to the « Span ».
The filter used is displayed on the upper left corner.
Parameters of the spectrum are:
Frequency: value of the fre-
quency where the cursor is,
user can enter a frequency
value, or increase – decrease
the frequency with <> keys
Reference level: can
be modified with up-
down arrows
7849B – 7859B – 7817B
Satellite
Cursor: simply press the area
where you want to move or set the
cursor
Span : frequency span around the
center frequency
Terrestrial
List: you can select a Pro-
gram (in the current list)
p.
61
Channel: use a chan-
nel for the spectrum
(in terrestrial mode).
Frequency range: can
be changed using the
arrows
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