STEREOCODER
GO
003
Characteristics
and
Uses
The
Stereocoder
GO
003
combines
the
”left“
and
"right“
infor-
mation
and
forms
a
coded
stereo
signal
(multiplex signal,
MPX
signal)
for
transmitter
modulation
according
to
the
pilot-tone
method
(CCIR
Recommendation
450,
Section
2).
The
piiot
tone
required
for the
multiplex signal
is
generated
in the
Stereocoder
with
crystal
accuracy.
The
GO
003
was
developed
in
particular
for
use
in FM
transmitters
and
complies
with
the
standard
specifica—
tions
5/32
of the
ARD.
Extremely
high
crosstalk
attenuation,
very
low
harmonic
distortion
and
high
S/N
ratio
are
the
outstanding
features
of the
new
coding
method
used
(see
also
Description).
In
addition
to
stereo
signals,
mono
information
can
be
trans-
mitted.
The
respective
mode
of
operation
can
be selected
locally
or
by
remote
control
and
is
maintained
even
in
case
of
AC
supply
failure.
Two
isolated
multiplex
outputs
are
provided
on
the
Stereocoder
GO
003
to meet
the
requirements
of
use
with
transmitters.
For
checking
purposes,
the
GO
003
is
equipped
with
a
high-grade
.
.
L+Ft
floating
output
for the
M
Signal (
).
The
sensitivity
of the
AF
inputs
can
be
accurately
matched
to
the
input
levels
by
means
of
step
switches
over
a
wide
range.
The
built-in
AF
oscillator
produces
a
500—Hz
signal
of
high ampli-
tude
stability
and
low
harmonic
distortion
for
measurements
and
Checks.
This
oscillator
can
be
used
for
modulation
in
the
following operating
modes:
L
R
L
=
R
(M signal)
L
=
—R
(8,
difference
signal)
If
any
of the
switches
for
preemphasis,
pilot
tone
or
operating
mode
is
not
in
the
normal
operating
position,
a
signal lamp
on
the
front
panel lights
up. Modulation
of the
coder
and
its functions
are
indicated
on
a
built-in
peak
voltmeter.
L‘R
0dB10dB
i
4
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mitt:
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MPXZ
T“
T(affic—radio
signal
Additional
___
Signal
[Option
SCAA
|—<——
I
SCA
Modui.
I
——<
L_—_—‘
I
MP“
Ac
supply
Block
diagram
G0
003
D:
:::X
4H
Signalling
contacts
.
—
Pilot
tone
‘
—
E:
lot
e'xt.
emo
controfied
Mono/Slereo
switchover
[___
Mono/Stereo
