5.3.7
Crosstalk
L(R
Set
the
pilot
mode
selector
(8107)
to
”off".
Switch
off
the
preemphasis
(8105).
Measure
at
the
multiplex
output
(BUAO)
using
an
oscilloscope
with
high
over-
load
capability.
Drive
one
channel
with
+6
dEm
and
at
the
specified
frequency;
measure
the
deviation
from
the
zero
line,
i.e.
the
crosstalk
(see
Fig.
7d).
Sequence
of
adjustments:
R264,
R263,
C147,
C146.
Trigger
the
oscilloscope
with
an
AP
signal.
Connect
BUlO.2
and
EUlO.3
(transformer
screening)
to
chassis.
Channel
L
(EUIO)
Channel
R
(BUEO)
Crosstalk
5.3.8
Crosstalk
M/S
Switch
off
the
pilot
mode
(8107)
and
the
preemphasis
(8105).
Measure
at
the
multiplex
output
(EU40)
with
a
selective
AF
voltmeter.
Drive
both
channels
simultaneously
with
+6
dEm.
The
attenuation
referred
to
the
input
level
must
be
attained
at
the
specified
test
frequency.
Connect
BU10.2
and
EU20.2
(transformer
screening)
to
chassis
while
measuring.
Test
frequency
Adjustment
Attenuation
R137
L101,
L105,
alternately
check
only
+)
Input
in
antiphase
R
38122
—
28
