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Making Measurements Using Spectrum Analyzer Mode
Demodulating and listening to an AM or FM Signal
‘4u
MKR
104
95
MHz
REF
48.8
dBmV AT 10 dB
14.31
dBmV
PEAK
1
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1
n
p
START
88.00
MHz
STOP
108.00
MHz
RES
BW
100
kHZ
VBW
30
kHZ
SWP
75.0
mse
Figure
5-11.
Demodulation of an FM Signal
Example: The signal can be continuously demodulated if the spectrum
analyzer is in zero span.
1. Place the marker on a signal of interest as in steps 1 through 3 of the
previous example.
2. If the signal of interest is the highest-amplitude on-screen signal, set the
frequency of the signal to center frequency by pressing
(-1
then
MK TRACK ON OFF (ON). If it is not the highest-amplitude on-screen
signal, move the signal to center screen by pressing
[ml
and
MARKER
+CF
3. If marker track is on, press
ISPAN_)
and 1
@
to reduce the span to 1
MHz. If marker track is not used, use the step-down key
(a)
to reduce
the span and use MARKER
--+CF
to keep the signal of interest at center
screen.
4. Set the span to zero by pressing ZERO SPAN . ZERO SPAN turns off the
marker track function.
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