Spectrum Analyzer Measurements 3-20 AM/FM Audio (Requires Option 24 or Option 509)
Spectrum Analyzer MG PN: 10580-00447 Rev. H 3-105
SETUP Menu (AM/FM Audio RF Spectrum)
The default view of AM/FM Audio measurement is RF spectrum view. The AM/FM audio demodulation SETUP
menu is available in MEASURE > MEASUREMENT > AM/FM Audio > SETUP.
DEMOD FREQ: Sets the audio demodulation frequency.
DEMOD MKR: Toggles the tracked marker on and sets the demod frequency to track the
marker frequency. Use the “MARKER Menu” on page 3-46 to adjust the marker
parameters.
MARKER TRACKED: Selects which marker to track. When DEMOD MKR is enabled,
the demodulated frequency tracks the indicated marker.
MODULATION: Selects the modulation type to demodulate the RF signal. Available
modulation types are AM, US Band (upper sideband), LS Band (lower sideband), FM
Narrowband (6.25 12.5 and 25 kHz), and FM Wideband.
AUDIO: Toggles the demodulated audio output (sound) on or off. The demodulation
frequency must be within the current sweep for audio demodulation. Slide ON the toggle
button to listen to the audio signal. Note that AM/FM audio demodulation cannot be used
in conjunction with IQ Streaming or when the IQ streaming output port is set to Data Out.
VOLUME: Sets the percentage of audio output volume.
RECORD DURATION: Sets the audio recording time. The maximum recording time is
approximately 27 hours, depending on available storage.
RECORD: Starts audio recording. Recorded audio files (.wav) are saved to the Waves
folder. Audio will be recorded for the recording duration or will stop when AUDIO is
toggled off.
SQUELCH LVL: Sets the RF threshold level for audio playback. This is typically used
with weak or intermittent signals to mute the static sound when the signal is below the
squelch threshold.
PRESET SETUP: Presets all the AM/FM audio setup parameters.
Figure 3-86. SETUP Menu (AM/FM Audio – RF Spectrum)
Note
For simultaneous audio demodulation and trace sweep, the set span must not be greater than the
maximum capture bandwidth based on the installed bandwidth option (No option: 20 MHz;
Option 103: 55 MHz; Option 104: 110 MHz) and the tuning range must not cross more than one
internal local oscillator tuning points. These conditions will be indicated by a transient status
message at the top of the display.
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