Sharp GF-9500H Serviceanleitung Seite 14

AM IF/RF
• Set the signal generatorto producea signalof 400Hz, 30%,
AM modulated.
• For adjustments in steps 4 and 9' see
TEST FRE.
STEP BAND
STAGE QUEN-
CY
IF (As shown in Figure 20-1, make connection of instrument.)
455kHz
{68 kH)
or 1-1K. end of
MW
RF (As shown in Figure 20-2, make connection of instrument.)
2 LW
145kHz
Band
cover-
age
3
LW 295kHz
4
LW 170kHz
Track-
ing
5 LW
270kHz
Répeat steps 2.3,4 and 5 until no further improvement
6
can be made.
RF (As shown in Figure 20-3 make connection of instrument.)
7
MW 51 OkHz
Band
cover-
1650
age
8
kHz
600
9
kHz
Track-
ing
1400
10
kHz
Repeat steps and 10 until no further improrement
11
can be made.
RF (As shown in Figure 20-3 make connection
5.85
12
sw
MHz
Band
cover-
18.5
age
13
SW
MHz
14
sw
MHz
Track-
ing
16
15 sw
MHz
Repeat steps 12, 13, 14 and 15 until no further impro-
16
vement can be made.
Check the alignment of the receiverantenna coil by
bringing a pieceof ferrite (suchasa coil slug) nearthe antenna
loop stick, then a pieceof brass.If ferrite increases o utput,
loop requires more inductance. If brassincreases output, loop
requires lessinductance.Changeloop inductanceby sliding the
bobbin toward the center Of ferrite core to increaseinductan-
ce, or away to decrease inductance.
ALIGNMENT
DIAL ADJUST-
REMARKS
SETT- MENT
ING
High
Adjust for
T3
best ''IF"
dial
curve
Low
end of
LIO
dial
High
end of TC8 Adjust for
dial maximum
output
170k
Hz
270k
TC5
Low
end of
L9
dial
H igh
end of TC7
Adjust for
dial
maximum
output
600
kHz
1400
TC4
kHz
of instrument.)
Low
end of 1.8
dial
H igh
Adjust for
end of TC6
maximum
dial
output
L6
MHz
16
TC3
MHz
SWF Ep
GENERATOh T EST LOOP BAR ANTENNA
o
abou t
10 cm
Figure 20—1
SIGNAL
GENERATOR TEST
LOOP
ab Out
o
60 cm
Figure
R c
SIGNAL
GENERATOR Telescopic
DUMMY Antenna
GNO
Figure
-20-
I-OSCOPE
R30
Hot Side)
L 7 UNIT
GNO
ELECTRONIC
VOLTMeræR
MW/LW
BAR ANTE-NNA EXT. sp
(J601 , J602)
UNIT
3.20htn
20—2
To Telescop.c Rod Antennj
R 30 ohm
Z 50 ohm<
C 2 18 PF ELECTRONiC
Z - Output impedance of signal generator
VOLTMETER
To chassis G ND
Rod
EXT. sp 0601, J602)
UNIT
3.20hm
GND
20—3
"IF •• Curve
to
O
o