Am/Fm/Ssb Demodulation - Anritsu MS2024A/MS2026A User Manual

4-18 AM/FM/SSB Demodulation

4-18 AM/FM/SSB Demodulation
The VNA Master built-in demodulator for AM, narrowband FM, wideband FM and single
sideband (selectable USB and LSB) allows a technician to hear an interfering signal to ease
identification. The demodulated signal can be heard using either the built-in speaker, or
through a monaural headset connected to the 2.5-mm jack on the test panel.
Demodulation Procedure
1. Press the
Shift
2. Press the
Demod Type
match the modulation format of the signal.
3. Press the
Back
4. Press the
Demod Freq
frequency of the signal to be demodulated. For USB and LSB signals, fine tune the
signal by adjusting the
meaning that the re-injected carrier is exactly at the demodulation frequency. The
soft key allows adjustment of the beat frequency oscillator to fine tune the
Freq Osc
signal through a span of ±10,000 Hz.
5. Press the
On/Off
6. Press the
Volume
audio volume from 0% to 100%. For most headsets a volume of 40% is adequate.
7. The
Demod Time
a value from 100 ms to 500 seconds.
4-18
key followed by the
soft key and select
soft key.
soft key and use the keypad or rotary knob to enter the center
Beat Freq Osc
soft key to enable the measurement.
soft key and use the
soft key sets the time the VNA Master will demodulate the signal. Enter
(4) key and the
Measure
,
FM Wide Band FM Narrow Band
. By default the BFO frequency is set to zero,
arrow keys or rotary knob to change the
Up/Down
MS20xxA VNA Master UG 10580-00166 Rev. C
Chapter 4 — Spectrum Analyzer
soft key.
AM/FM Demod
, ,
AM USB
, or to
LSB
Beat