Sharp GF-8989H - AM Band Alignment; AM IF;RF Alignment Steps

AM IF/RF ALIGNMENT
SIGNAL GENERATOR
BAND
TEST
CONNECTION
TO
INPUT
SIGNAL
RECEIVER
FREQUENCY
RECEIVER
ADJUSTMENT
DIAL SETTING REMARKS
+
Refer
to
Figure
19.
Exactly
455
kHz:
High
end
of
dial.
Adjust
for
il
Adjust
the
MW
1
MW
IF
(GF-8989H)
{minimum
capac-
best
“IF”
IF
transformers.
Exactly 468 kHz: ity) curve (T101)
aif,
(GF-8989E)
I
(T102)
Refer
to
Figure
21—1.}
Exactly
145
kHz.
Low
end
of
dial.
if
Adjust
for
Adjust
the
LW
2
LW
!
(400
Hz,
30%,
AM
(maximum
capac-
maximum
oscillation
coil
(L107).
Band
|
=
modulated)
ity).
7
output.
_
:
4a
é
Coverage
Same
as
step
2.
Exactly
295
kHz.
High
end
of
dial.
Same
as
step
2,
Adjust
the
LW
3
LW
(400
Hz,
30%,
AM
(minimum
capac-
oscillation
trimmer
modulated)
ity).
1
(TC8).
2
-
“
ae
:
;
cae.
ae
ees
ade
ae
ata
es
Se
yah
an
Same
as
step
2.
Exactly
170
kHz.
170
kHz.
Same
as
step
2.
Adjust
the
LW
4
LW
(400
Hz,
30%,
AM
|
bar
antenna
coil
(L102).
eee
E
=
i:
modulated)
_
ees
—
=
|
See
[Note
A}.
|
abe
s
Same
as
step
2.
Exactly
270
kHz.
270
kHz.
Same
as
step
2,
|
Adjust
the
LW
5
LW
(400
Hz,
30%,
AM
|
antenna
trimmer
modulated)
|
(TCS).
i 1
6
|
LW
Repeat
steps
2,
3,4,
and
5
until
no
further
improvement
can
be
made.
|
Same
as
step
2.
|
Exactly
510
kHz.
:
Low
end
of
dial.
Same
as
step
2.
T
Adjust
the
MW
7
MW
(400
Hz,
30%,
AM
|
(maximum
capac-
oscillation
coil
(L106).
Band
modulated)
ity)
BT
heavens
Fe
=
a
ls
—
fo
oo
pee
>
fh
ah
Se
ame
as
step
2.
Exactly
1650
kHz.
High
end
of
dial.
Same
as
step
2.
Adjust
the
MW
8
MW
(400
Hz,
30%,
AM
{minimum
capac-
i;
oscillation
trimmer
L
modulated)
ity)
|
(TC7).
Same
as
step
2.
Exactly
600
kHz.
600
kHz.
Same
as
step
2.
|
Adjust
the
MW
9
MW
(400
Hz,
30%,
AM
bar
antenna
coil
(L102).
modulated)
See
[Note
A].
Tracking
+—
—
—
ae
_
+
a
-—
ected
LESTE
TRL
ee
Same
as
step
2.
Exactly
1400
kHz.
|
1400
kHz.
Same
as
step
2.
Adjust
the
MW
10
Mw
{400
Hz,
30%,
AM
antenna
trimmer
modulated)
|
(Ta),
Repeat steps 6, 7, 8 and 9 until no further improvement can be made.
Refer
to
Figure
21—2.
|
Exactly
5.85
MHz.
r
Low
end
of
dial.
Same
as
step
2.
|
Adjust
the
SW
~12
SW
(400
Hz,
30%,
AM
(maximum
capac-
|
oscillation
coil
(L105).
° ' Band modulated) ity) i
Coverage
Same
as
step
12.
Exactly
18.5
MHz.
i
High
end
of
dial.
|
Sameas
step
2.
|
Adjust
the
SW
13
Sw
(400
Hz,
30%,
AM
(minimum
capac-
oscillation
trimmer
modulated)
ity)
|
(TC6).
4
-b
-t.
4
S
pe
Sie
a
ONS,
OI
BS
Same
as
step
12.
Exactly
6.5
MHz.
6.5
MHz.
Same
as
step
2,
Adjust
the
SW
14
SW
(400
Hz,
30%,
AM
antenna
coil
(L101).
modulated) |
Tracking + e
Same
as
step
12.
Exactly
16
MHz.
16
MHz.
Same
as
step
2,
Adjust
the
SW
15
SW
{400
Hz,
30%,
AM
antenna
trimmer
Modulated)
L
(TC3).
SW
Repeat
steps
12,
13,
14
and
15
until
no
further
improvement
can
be
made.
-18—