ANALYZER
IF
DISPLAY
INCIDENTAL
AM
UNMODULATED
FM
CARRIER
MODULATED
FM
CARRIER
WITH
INCIDENTAL
AM
AM
MODULATION
x =
PE
A K
AMPLITUDE
Y =
VALLEY
AMPLITUDE
X-V
%
AM
=-
X100
X+Y
FIGURE 4·14. ANALYZER
IF
DISPLAY
Figure 4-14 shows a typical
IF
DISPLAY, its modulated FM carrier with incidental AM, and a formula for calculating %
AM. Use the IF mode
to
view the modulation envelope
of
the
RF
signal, to detect
and
examine incidental
AM
(in
FM
modes),
and
to check
AM
depth
of
modulation. Because the
IF
DISPLAY provides only a qualitative indication, use the
Monitor DISPLAY with AM Monitor
FUNCTION
to
determine precise AM measurements.
4-25
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