AM/FM/PM Analyzer (Option 509) 7-19 Audio Demod AM Menu
Spectrum Analyzer MG PN: 10580-00349 Rev. H 7-29
7-19 Audio Demod AM 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: AM, USB,
or LSB. The selection toggles through 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.
Beat Freq Osc: Sets the beat frequency of the oscillator to exactly set the
demodulation frequency of USB and LSB signals. Displayed only when USB
or LSB is selected as the Demod Type. This can also be used when
demodulating CW (Morse code) signals.
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 7-26. Auto Demod AM Menu
Back
Volume
Squelch Power
-120 dBm
Demod Type
AM USB LSB
On
Off
Beat Freq Osc
# Hz
Demod Time
# s
Audio Demod
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