7-20 Audio Demod FM Menu AM/FM/PM Analyzer (Option 509)
7-30 PN: 10580-00349 Rev. H Spectrum Analyzer MG
7-20 Audio Demod FM Menu
Key Sequence: Measure or (Shift + 4) > Audio Demod
On Off: Press to turn On and Off the auto demodulation function. The
current state (On or Off) is underlined on the submenu key.
Demod Type: Press to select the type of desired demodulation: wideband
(W-Bnd) or narrow band (N-Bnd). The selection toggles between the
choices, and the current setting is underlined on the submenu key.
Demod Time: Press to set the demodulation time. If you use the numeric
keypad to enter a value, then the submenu keys change to Time in units of
min, s, ms, or µs. Demodulation time denotes the audio playback time. Audio
playback and the graph display occur one after the other. For example, if the
demodulation time is chosen as 3 seconds, then one complete sweep of
graph display occurs followed by 3 seconds of audio playback, followed by
one sweep of graph display, followed by 3 seconds of audio playback, and
so on.
Volume: Press to set the instrument speaker volume for listening to the
demodulated signal.
Squelch Power: Sets the squelch power value. Use this setting to limit
noise in the demodulated signal.
Back: Press to return to the Measurements menu.
Figure 7-27. Auto Demod FM Menu
Back
Volume
Demod Type
W–Bdn N–Bnd
On
Off
Demod Time
# s
Audio Demod
Squelch Power
-120 dBm
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