Operating instructions
-
--
---=
,--
-=-""
= =
=--
=-
-
---=-
-
--
- -
will
be
of
a
higher
v
alue.
See
Figure
4-4,
detail
B.
During
the
neg
ative
cycle
of
modulation,
the
puls
es
occur
at
longer
in-
tervals
producin
g a
lower
volt
age
at
the
output
of
the
filter.
See
Figure
4-4,
de-
t
ail
C.
The
output
of
the
filter
follow
s
the
fr
equ
enc
y
modul
ation
of
th
e
IF
signal.
The
r
esultin
g audi o sign al is
fed
to th
e
VOL
UME contr ol and to
the
O
scillosco
pe
or
FM
D
eviation
M
et
er
for
an
indication
of
th
e a
mo
unt
of
modul
ation.
Wh
en
the
m
onit
or
ed
signal
is
of
suf-
ficient
ampl
it
ude, a de
control
vo
ltage
from
th e
Broadband
Mixer
or
Preselec-
tor,
turns
on
S
chmitt
trigger
Q6
and
Q7. .
This
re
sults
in
swit ch Q8
suppl
ying
a
ground
to
the
one-
shot
multi
vibr ator and
the
SIG NAL
LEVEL
l
am
p,
turning
them
on. T h
us
,
reli
abl e
meas
u
re
me
nt s
ca
n
be m
ad
e p
rov
iding
th
e signal
is
of .suf-
fi
cient
le
vel.
Two
contr
ols
are
provided
to
adjust
the
zero
re
adin
g
of
the
FREQUENCY
meter.
Potentiometer
R30
is
for
c
oa
r se
calibra-
tion
of
the
brid
ge and
fr
equ
ency
me
asuring
cir
cuit.
Th
e
front
p
an
el CA L .
control
(FP-
Rl-l)
is
for
fine
ca
li b
ra
ti on a nd com-
plet
es
the
brid
ge
cir
cuit.
When th e CE- 7
is
us
ed as a C\V-
or
FlVI-
sign
al
generator,
the
a
ction
of
th e s
ec
ond
IF and
discrim
in
ator
circuit
s
is
the
sa
me
as
de
scrib
ed
for
the
me
asuring
mod
e.
The
1
0-
MHz
input
to
the
bo
ard
,
howe
v
er
'
o
rtai-
b
n
at
e s on th e Mul ti - Os ci
lla
tor
board
and
the
output
is
amp
li fied in th e
Br
oadb
and
Mix
er
or
Pre
s
el
e
ctor
(l
ast
two s ta g
es).
A
fte
r a mpli-
fi
cati
on
the
sig
na
l is fed to
the
se
cond
m
ixe
r
in
the
Sec
ond
IF
and
Dis
criminator
boar
d.
1.3
Power-Supply
Board
Th
e CE
-7
co n
ta
ins
three
powe r
s
upplie
s p
ro
viding
re
gul
at
ed
out
put
s
of
+5 vol
ts
, +20 volt s , and
-1
2 vo
lts
.
Re fe r to
Fi
gur
e 4- 5 f
or
th e
blo
ck d
iag
ram
and
Fig
ur e 6
-2
f
or
the
s ch
em
atic
di
agr
am
of th e Po
wer
Supply bo
ard
. AC po
wer
is
f
ed
throu
gh
power
tr
ansf
ormer
s
ec
ond-
ar y
winding
s to
the
+20-
and
-12-v
olt
r
ectifiers.
The
117
-volt
AC
line
power
is
f
ed
directl
y to
the
oven co ntr ol ci
rc
uit .
'---I
I
VOL
U
ME
I
AU
DIO
I
2
ND
IF A
ND
AN
.P
LIFI
ER
~~-----
--~
DISCRIMINATO
R
I
I
+ 20
VDC
~
:~
:
:
PO
',,
'ER
+ 5
VDC
I
S
UP
PLY
I
~
'~
I
(REG
ULATE
D)
I
-12
V
DC
+ 13
VDC
I
I
<U
NREGULATED)
!
I
t
I
I
CR
YSTAL
O
VE
N
OVEN
I
CO
NTROL
I
ASSE
MBLY
I
01O0 [
-f-----r-
CH
_
A 5
1
~~ENltr
MODEL 301
O
SCILL
O
SCOPE
I
I
I
I
I
I
r
I"P-O-WE-R- OF- F' I:
115/230
V~
--......
~
"C~>-~-+------4-----+----l
50-'+00
~
h
-
.-/~+-t_
---~-------1'------l
L
Fi
gure
4-5.
Power-
Supply
Board,
Block
Diagram
4-7
5601"0015"1