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VR5A0
VRA01 VRAEM
VR
FA. 0
1- 1 fiA132
ICI
i C402
VRA02
„„e
A 106
71.2 71511
9
I
1C40
0 05
GNO
v.
22
1C403
570•659• 11
DEMOVi
L.02 0
LP203
CF30 I CF303
0301
a cl
0 Ili
IrO>Zie
W
lY
?FL,
ETC-658
,r
0 4 7P3
I
crao,
T305 TC303
NM AL
D
00
ANT TERMINAL
RP TRAP UNIT 0
VR203
VR202
C5
0
ETC0659
Fig. 8
TUNING METER JIG
Bend
Suppress
Circuit
End
—
Input
Level
Interference Wave
r,ueney
DI and D2
disappear when
attenuating A
or B to minimum
Band
Suppress
arcun
C,aracter
Input
Level
\
f'
I
Fig. 10
SEMICONDUCTORS
in
NJM45580 (JRC)
HA112223W
HA 2412
(Htachi)
HA
I
223W
H014027E1
(Hitachi)
TA7060AP
(Toshiba)
HA 12412
01111
TU-767
ROUGH DIAGRAM OF ADJUSTMENT POINTS
PRINCIPLE OF SUPER SEARCHER SYSTEM (SSS)
If two or more powerful stations are on the FM band, unexpected
radio waves are generated in an area between them. This is
called "intermodulation disturbance " . When receiving a station
near these generated waves, a ragged sound or other disturbing
noises occur.
Fig. 10 explains this situation. Intermodulation components
D1 and 02 are generated by stations A and 8, disturbing the
desired reception station C.
Interference wave D1 cannot be separated from the wave of
station C. However, by removing this disturbance caused by A
and B with the band suppress circuit,
D1/132
will disappear.
Operation:
If the signal indicator (green) is lit, but the quality indicator is
disturbance is present. Tam ON the SSS switch, and set the SSS
controller to ( ) noise mode. Adjust the SSS controller volume
so that the noise level indicator (red) shows the minimum value.
•
Band suppress circuit -= RE trap filter (Frequency variable)
If an other station has been selected, the SSS is rest auto-
matically.
-8-
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