Model
8901B
Operation
BLOCK DIAGRAM
INPUT
ATTENUATOR
IF
AMP
AUDIO
El
AUDIO
PRE.OISPLAY
SWITCH
FM
Output
Block
Diagram
COMMENTS
Inherent
IF
Component
FM
OUTPUT is unsquelched and
also
contains
a
significant component at twice the
IF
frequency
which is greatest when operating
at
a
carrier frequency of
150
kHz.
Inverted AC Output Component
Note
that the sense
of
the ac output component (corresponding
to
the demodulated
FM)
is
inverted
for carriers above
2.5
MHz.
Accuracy
of
Output During
RF
Level Measurements
When
RF
Level measurements (Special hction
35)
are made, automatic selection
of
RF
input attenuation overrides any manual settings that might have been selected with Special Function
1.
The selected attenuation could degrade the accuracy
of
measurements made on the
FM
OUTPUT
signal.
3-164
FM
Output
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