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Adjustment of Coils L23, L24, and L26
Coil
PCB
Notes:
Be very careful when doing coil pitch adjustment
because it greatly affects the frequency.
Secure the coil with glue after alignment. Be sure
the glue is dry and the coil is secured. Also, be
sure that the environmental temperature is nor-
mal. Then, repeat VCO (PLL2 and PLL1) align-
ments on Page 6.
Reference Frequency Osc. Confirmation
C
o
n
r t
l o
S
e
t t
n i
g
O
F
F
V /
O
L
U
M
E
c
o
t n
o r
: l
O
S
Q
U
E
L
C
H
c
o
t n
o r
: l
C
C
W
u T
n
e
o t
1
7
4
M
H
. z
Note: Care should be taken not to make any contact between TP1 and the shield case.
455 kHz FM Discriminator Coil Alignment
C
o
n
r t
l o
S
e
t t
n i
g
O
F
F
V /
O
L
U
M
E
c
o
t n
o r
: l
O
S
Q
U
E
L
C
H
c
o
t n
o r
: l
C
C
W
u T
n
e
o t
1
7
4
M
H
, z
8
6
0
M
a
n
d
4
5
0
M
H
. z
FM Signal
Generator
Use
non-metallic
tuning tool
Figure 3
T
e
t s
n I
t s
u r
m
e
t n
. N
C
o
n
n
e
t c
h t
e
f
e r
q
u
.
c
o
u
t n
r e
o t
T
P
. 1
S
e
e
F
g i
u
e r
. 4
Unit
TP1
Under Test
T
e
t s
n I
t s
u r
m
e
t n
C
o
n
n
e
t c
o i
n
. N
C
o
n
n
e
t c
h t
e
s
g i
n
l a
.
g
e
n
r e
t a
r o
o t
h t
e
A
N
H
, z
a j
k c
a
n
d
h t
e
D
C
S
S
V
M
o t
T
P
. 4
S
e
e
F
g i
u
e r
. 5
ANT. Jack
Each coil should be adjusted carefully by changing the
pitch of the coil little by little using a non-metallic tuning
tool as shown in Figure 3.
Increase the pitch of the coil when the measured volt-
age at TP2 or TP3 is higher than the voltage listed in
Table 2 for the PLL2 VCO alignment, PLL1 VCO1 align-
ment, and PLL1 VCO2 alignment.
Decrease the pitch of the coil when the measured volt-
age at TP2 or TP3 is lower than the voltage listed in Table
2 for the PLL2 VCO alignment, PLL1 VCO1 alignment,
and PLL1 VCO2 alignment.
C
o
n
n
e
t c
o i
n
A
d
u j
t s
e
n
y c
- - -
Frequency Counter
A
d
u j
t s
T
4
. 1
u T
n
e
o t
1
7
T
f
e r
q
u
e
n
y c
o t
a
n
d
a
d
u j
t s
T
S
S
V
M
.
TP4
Unit
Under Test
Figure 5
7
C
o
n
r i f
m
t a
o i
n
C
o
n
r i f
m
h t
e
f
e r
q
u
e
n
y c
c
o
e r
a
d
s
5
5
4
7 .
7
5
M
H
z
+
/
1 -
Figure 4
R
e
s
u
t l
4
M
H
. z
S
t e
h t
e
s
g i
n
l a
g
e
1
7
4
M
H
, z
1
0
0
u
V
o
u
p t
t u
4
f
r o
1
3 .
+
/
0 -
0 .
5
v
o
s t l
o
DC SSVM
Table 2
u
t n
r e
k
H
. z
n
r e
t a
r o
n (
o
m
o
d
) .
n
h t
e
D
C
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