Rotel RT-426 Bedienungsanleitung Seite 10

FM STEREO
GENERATOR
300 ohm
DUMMY
REAR
FM
DET T
FM MP X Alignment Procedure
NOTES: The FM IF
completed before attempting
ment. Poor FM
poor multiplex
Instruments: FM Stereo
Osci IIoscope.
l. Set Function Selector to FM STEREO position.
2. Set VR301 at the middle
indicator lights up.
3. Connect FM Stereo
minals and AC VT VM
Out (R-ch).
4. Set the frequency at 98MHz
appears, select another frequency).
erator modulation is as follows:
Pilot
Modulation Frequency I KHz (L-ch Signal)
H. D. ANALYZER
LLOSCOPE
o
OUTPUT
Fig. 5.
Abb. 5.
Fig. 5.
MONO
SET
RANGE
INDICATOR
amplifier alignment must
this MPX align-
IF alignment will result
adjustment.
Generator, AC VT VM
of range in which
Generator to FM antenna
and Oscilloscope to
(if disturbing
FM Stereo Gen-
90%
CHASSIS
L 112 IC101
VR301
MPX
Ad j •
1 C301
MPX Amp.
FM MPX Alignment Hook-Up
UKW-MPX-Einstellung
Alignement FM MPX
VR301 SETTING POINT
STEREO
I MONO
TO THE MIDDLE OF
IN WHICH STEREO
LIGHTS UP
be Tune and adjust the VR302 so that the leakage signal
5.
on the Oscilloscope and AC VT VM is minimum.
6. Then change the connections of Oscilloscope and AC
in
VT VM from
the modulation
and
time, check that the leakage signal is minimum.
difference
is large, adjust the VR302 precisely so as to obtain
Stereo
equal levels between
Make sure the Stereo can be operated normally even
ter- 7.
when the modulation
Tape
Stereo Generator
signal
TOP VIEW PORTION
L 109
V CO
eeeee
L 301
VR302
MPX SEPARATION
Adj.
R-ch to L-ch. Tape out jack, as well as
signal from L-ch to R-ch. At the same
in leakage signal between R-ch, and L•ch
leakage signal.
degree of pilot signal of FM
is reduced from 10% to 6%.
)
If the