JVC RC-W410 - FM RF Tracking and MPX Fine-Tuning

| RC-W410 B/E/G/GI/V/V)
: Adjustment a e ; ,
f=] tem [ern oo
5
|
FM
RF
Tracking
adjust-
|
Input:
TP1
L1
RADIO/FM
1)
In
reception
of
87.5
MHz
signal,
adjust
ment
Output
:
TP3
L1
to
obtain
1.1791,
V
as
output
level
at
TP3.
2) After
the
adjustment,
apply
wax
to
L1
ICI
T)
to
secure
it.
:
MT)
L2
3)
In
reception
of
88.0
MHz
signal,
adjust
t2
Tco2
Ls
L2
to
obtain
maximum
output
level.
TC2
4)
In
reception
of
106
MHz
signal,
adjust
TC2
for
maximum
output.
L2,
TC2
5)
Alternately
repeat
the
above
steps
3)
and 4) to obtain maximum outputs
respectively.
6
|
FM
MPX
(multiplex)
Output:
RADIO/FM
1)
Receive
FM
signal
of
non-modulated
adjustment
Hot
side:
TP4
106
MHz,
60
dB.
Grounding
side:
2)
Connect
a
valve
voltmeter
to
TP4
with
TP7
a
100
kQQ
resistor
between
them.
3) In the condition that TP4’s output level
is set so high that the valve voltmeter
reads to the full extent, supply the out-
put from the voltmeter to a frequency
counter for measurement.
VR1
4)
Adjust
VR1
so
that
the
frequency
counter
reads
75.75
+
0.1
kHz.
5) Check up frequency separation.
TP7
Ae) 5
TP4
C4) 1c2) T2
100 kQ
e| > Valve Voltmeter Frequency Counter
TP4
t
Set
this
as
near
to
the
clip
as
possible.
|
(No. 1768) 13