Specifications
e)
Change
the
values
ofV^
to
±6
volts.
Q:
Recalculate
the
theoretical
values
of
f
0
,
f
c
,
and
f,
using
the
actual
values
of
the
resistors
and
capacitors.
Q:
What
effect
does
the
power
supply
to
the
chip
have
on
the
output.
Q:
Repeat
the
procedure
used
in
c)
to
determine
the
lock
and
capture
ranges
and
center
frequency
for
V
cc
=
±
6
volts.
Q:
What
is
the
amplitude
of
the
output?
f)
Change
the
amplitude
of
the
input
to
.375
mv.
Q:
Measure
f
c
,
and
f,.
Repeat
for
amplitudes
of
.5mv
and
1
mv.
Comment
on
the
effects
of
these
frequencies.
Part
2:
FM
Demodulation
a)
Return
V
cc
to
±
10
volts.
From
the
Wavetek
132,
verify
a
.05mv,
100
Hz
sine
wave
on
channel
3
of
the
oscilloscope.
Split
the
line
from
the
Wavtek
132
and
send
the
signal
to
VCG
in
on
the
Wavetek
186
to
produce
a
FM
signal
out
of
the
Wavetek
186.
Adjust
the
Wavetek
132
settings
to:
Seq
length:
2
10
-1
arten:
20
dB
mode:
func
The
"shadowing"
on
the
signal
is
due
to
the
frequency
deviation
of
the
FM
signal.
Q:
Vary
the
carrier
frequency
(186),
measure
f
c
,
and
f,.
Take
care
to
measure
leading
edge
to
leading
edge
(or
visa
versa).
Q:
Comment
on
the
difference
(if
any)
from
those
of
the
free
running
configuration.
b)
Increase
the
message
signal
(132)
to
1000
hz.
Q:
Measure
f
0
,
f
c
,
and
fj
for
4
=
1000
hz.
Lab
5
Page
4
109