CARVER
i
ASYMMETRICAL
CHARGE
COUPLED
FM
DECODER
CIAL
NOTE
REGARDING
INTRODUCTION
Congratulations.
will allow
of
many stations that
Your TX1-11
with many sophisticated features that
stereo
all
this,
instructions.
the
concepts
WARRANTY
you to
listening, now,
be
CARD
You
has
been exceptionally engineered,
sure
We've
and
have purchased
receive noise-free
you
have previously found
and in the
to
read
prepared this
functions associated with
the
future.
safety, installation,
owner's
an
absolutely unique instrument that
and
multipath-free
to be
and is
will
enhance your enjoyment
To
take full advantage
manual
the
TX1-11.
for
stereo
unlistenable.
superbly crafted
and
operating
learning about
FM
reception
of FM
of
Please, fill
packing kit. It's highly
but
should
Carver's three-year limited Parts/Labor Warranty repair. Either from
a
local Authorized Carver Service Center,
you
fill
preceding
identifying
Here
are
using
the
•
Don't operate
out and
the
unlikely
out the
page.
some suggested do's
TXl-11 a safe,
the
Be
TXl-11.
return
unlikely
occur, your Warranty Card
warranty information
sure
the
to
as
TXl-11
the
Warranty Card
your
include
and
don'ts
well
as an
on any
that
came with
TXl-11
in the
any
personal
that
enjoyable experience.
power line voltage other than
will
or the
space
will
ever need service,
is the
factory.
we
included
ID
number used
make setting-up
the
ticket
We
also suggest
on the
in
TXl-ll's
to
further
and
that
•
Make
for
•
Unplug
or
if
specified
all
connections
all
other components
the
you're
on the
TXl-ll's
not
to and
power
going
rear panel.
from
the
in
your system, switched OFF.
and
antenna lead-in during electrical storms,
to use it for a
TXl-11 with
prolonged period
its
power,
of
time.
and
power
When
unplugging
the ac
line cord, grasp
the
plug
and
pull;
don't
yank
on the
If
the
technician.
stereo
Please,
There
electrical
you
move,
cord itself.
someone accidentally spills a drink
unit
and
system.
aren't
Keep
the
have
This
resist
any
shock.
the
carton
best shipping container
it
checked
applies
any
temptation
user serviceable parts inside. Avoid possible
Refer
and
packing material
out or
to
every piece
to
all
service work
cleaned
inspect
is the
on the
of
the
the
original carton. Hang
TXl-ll's
by a
equipment
to a
TX1-11 came
qualified service
inside
qualified technician.
cabinet, unplug
in
your
of the
in.
TX1-11.
Should
on
to
this
new
home,
be
more than
INSTALLATION
To
perform
two
sets
of
The
plugs
white
TX1-11
for
in an
owner's
the
safety, installation,
useful.
the
shielded signal leads (dual
of
signal leads
"left"
equipment rack
manual, too. When your music system gets
basic installation
are
color coded
and red for
"right".
or
case,
and
and
to its
programming instructions could
set-up
RCA
(If
the
of the
phono plug
for
"left
you're planning
optional rack
TX1-11,
and
you'll
to
phono
"right". Usually
to
"ears"
plug).
install
and a
need
the
phillips-head
screwdriver will
be
needed.)
PLACEMENT
If
you're mounting
the
TXl-11
in a
rack with other
components,
the
rack-
mount ears must first
panel. Instructions
assembly
the
proper
equipment
the
TXl-11,
cable
the
of
the
and
attachment
tuner
TXl-11's
connections. However, there
can be
mounting hardware.
closely together,
just place
will
reach without
TXl-11;
secured
bottom
for
be
installed
are
included with
to the
to the
panel.
it
near
excessive
both rack
to
either side
the
rack ears, detailing their
TXl-11's
case's
In
some case installations
you may
If
you're
the
preamp—
strain
are
and
open installations.
chassis. Once installed,
or
enclosure's
with
to
remove
not
planning
near enough
on the
other considerations
of the
rack
and in
the
to
rack mount
so the
cable,
tuner's
rails
rubber feet
signal
itself,
in
front
with
spacing
the
or on
placement
the
on
Heat,
doesn't
Never
vents, near motors,
Wipe
If
detergent:
SIGNAL CONNECTIONS
When
or
at
least normal amounts, shouldn't
generate much
mount
the
TXl-11's
you
have
don't
it
comes
receiver,
or
locate
to get
to
making
and the
cabinet from time-to-time with a soft,
use
be any
and
isn't
the
TXl-11
or
other sources
something stubborn off,
alcohol, ammonia,
signal
TXl-11's
sensitive
in
direct
of
connections
inputs
and
dust
or
outputs,
problem.
to
small
sunlight,
and
use a
other strong solvents.
between
amounts.
possible
mild dish soap
your
be
The
near forced-air
dry
existing
sure
unit itself
interference.
cloth.
to
plug
or
tuner
the
left
channel
(white
plugs)
into
left
inputs
and
outputs,
and
right
channel
The
your existing tuner
or
your
SEPARATE TUNER
TXl-ll's
amplifier
controls
calibrated
(red
plugs)
TX1-11
If
is
preamplifier.
you own a
inputs,
tuner inputs.
as you
the
designed
separate tuner, simply connect
and the
previously have used them. However, once
TXl-11,
into
the
to be
and the
If
you
right
installed
TUNER inputs
TXl-ll's
your tuner
must
inputs
outputs
not
change your tuner's level controls
and
outputs.
in the
on
has
signal chain between
your integrated amplifier
the
to
your preamplifier
level controls,
tuner outputs
or
set the
you
have
to the
without re-calibrating
TXl-11
with them,
RECEIVER
tape
inputs,
Then simply engage
CALIBRATION
CALIBRATION
1.
Find
into
If
you own a
monitor
and the
AND
the
your
or
loop.
"loudest"
tuner outputs that don't have a level control associated
simply advance
receiver, simply connect
The
TXl-ll's
the
OPERATION
the
TXl-11.
the
receiver's tape output
outputs
tape monitor switch
FM
station
Of
course,
level controls
the
go to the
in
your area.
receiver's
on
you may
to mid
TXl-11 into
jacks
your existing receiver.
(Generally
simply plug
rotation.
the
go to the
tape
input
this
the
receiver's
TXl-ll's
jacks.
will
be a rock
2.
Set the
-All
station.)
TXl-11 controls
front
panel buttons
as
follows:
"out".
-Back panel calibration switch "in".
-Back panel calibration control fully counter-clockwise
from
the
rear.
As
you
clockwise
will
during
It
is
Release
calibration procedure.
OPERATION
The
listen
be
achieved when
the
important
the
ASYMMETRICAL DECODER button engages
to the
and
watch
loudest passages
not to go
back panel calibration switch. This completes
tuner,
the
the
slowly
calibration indicator.
indicator blinks
of the
beyond this point.
turn
music.
the
calibration control
off
the
circuit. Simply push
as
viewed
The
proper calibration
from time
to
the
time
for
quiet
to
optimize
"OUT" position,
button
weak station noise
performance
except
present.
the
best.
THE FM
FM
reception.
The
NOISE REDUCTION button
the
circuit
the
is
pushed
in
those reception conditions where multipath distortion
Feel free
STEREO PROBLEM
to the
is
obtained when
is a two
for a
circuit
"IN" position,
and
multipath distortion. Ordinarily, optimum
to
experiment with either position
particular reception problem.
will
reduce
the
NOISE REDUCTION position
position switch that allows
weak
the
station
circuit
noise.
will
and
reduce both
In the
When
is
used,
choose
you
the
is
The
fundamental
FM
stereo problem
is
simple.
The
broadcast system
was
designed over
30
years
ago
before
the
advent
of
stereo.
When
stereo came along,
went before.
The
distortion-free
conditions. Enter
Your TX1-11
noise
and
still provide fully separated stereo reception with space,
depth
and
ambience. We're tempted
intended over
alternative
the
stereo transmission system selected
degrading
to
the
30
ratio
two
channels were
result: a giant step backwards
reception
the
can
for all but
TX1-11.
drastically reduce
years ago. Back then,
static-filled
of
signal
AM. But it was in
to
forced
to fit
nearly ideal
multipath
to
say, sound quality
FM
was a
to
augment mono
noise FIFTEEN
where
in
and
and
one
channel
terms
of
perfect
noise^free,
reception
distant station
as it was
noise-free, wide-band
mono.
TIMES!
Unfortunately,
FM
ended
(More than
up
23
db.)
That's
distortion-filled
UNDERSTANDING
the
FM
system
unless you're
Stereo frequency modulation transmission
than
you
might think.
and
Carver's solution.
next
Right
to
get
Stereo
to
signal. A receiving circuit adds
Left—only
FM is not
each other. Rather there
and
Left Plus Right comes
we
live with today:
in a
But
understanding
direct line with a strong station.
hiss
and
often multipath,
is a lot
it
will clarify both
more complicated
the
like a 2-track cassette with separate signals
Right—only
in
just fine
is a
signals.
Left—Minus—Right
and
subtracts sums
(As you
on
mono receivers because
might have guessed,
and a
and
it IS
Left—Plus-
differences
problems
mono.)
It's
that
These
Left—Minus—
signals
are
transmitted
Right
signal
at
that's
to
blame.
different parts
of the
audio
spectrum
to
your home.
and
unfortunately
L—R
AUDIO GHOSTING
middle
To get
of a
Because
stereo
FM
perfectly, you'd have
vast flat plain with
Multipathiscausedby
multiple
L-Rsignal
any
protruding
mass—
antennas, even bridges— looms
is
extrememly
no
other buildings
reflections
charge-couplmgcircuitry
of the
L-Rsignal
cancels
hills,
up to
reflect signals while
prone
to be the
all but the
to
true
mishaps
only house
anywhere
on the way
in the
on the
plain.
mountains, skyscrapers, other
on
their
way to
of a second
off
your
tuner.
Then
you get TWO
later,
something.
(This
audibly affected,
second,
third
and
These additional images
reinforce
signal deviates
causing
and
then remove part
in
constructive
signals.
One
directly,
and one or
after it's taken a longer angular
happens with
but you can see the
fourth
image.)
are
frequency,
and
destructive
it
TV and AM,
frustrating
disastrous
of the
signal alternately.
beats with
interference
too.
to FM
the
reflective signal,
more a fraction
path
of
bouncing
AM
isn't
result
on TV: a
reception because they
As the
patterns which bear
main
no
resemblance
to the
original signal.
An
engineer calls these "beats"
phase
modulation
truly
is
decoded
the
reception problems actually CAUSE
and
amplitude modulation.
While stereo
component
audible distortion caused
Without
waxing
FM
receivers have made much
of
this
interference,
by the
too
technical, suffice
tricked into reading phase modulation
and
made into a brand
more faithfully
Thus
instead
of
it's
deceived!
just degrading
new
signal.
NEW
of
cancelling
they have never addressed
phase modulation part.
to say
as
frequency modulation, which
The
the
existing signal, multipath
AUDIBLE
that
your
better your current tuner,
SOUNDS.
And
the
FM
receiver
we've
amplitude
the
is
all
heard
how bad
HOW THE
TO
TX1-11
SEE
FIGURE
these sounds sound.
WORKS
1,
PLEASE TURN
TO
LAST PAGE
OF
MANUAL
Fig.
1—
Block
diagram
TXl-ll's
of the
special
noise-reduction
and
multipath-
reduction
circuitry,
NOISE
AND
MULT
IP
ATH-REDUCTION
CIRCUITRY - Refer
to
Fig.
1
There
and
multipath
result
sum-and-difference
of
the
and R signals from a conventional multiplex decoder, these signals
are
first
a
mono signal, while
information.
containing
mation
localizing information provides
are
three separate circuit elements which contribute
reduction.
of
investigations into both psychoacoustics
matrix techniques used
left
and
right stereo
recombined
In
this approach,
two
types
and an L-R
component having specific localizing phase information.
The
FM
into
the L - R
of
L + R and L - R
signals:
three elements
in the
signals. Having recovered
signals.
signal conveys
the L - R
An L-R
the
left
signal
component having random phase infor-
and
of the
the
right stereo image
system
and the
transmission
The L + R
"stereo"
can
be
are a
standard
the L
or
thought
and
constitutes
"difference"
to
of as
lo-
noise
recovery
The
cation
stereo
information
available
we all
L-R
using
because,
largely
in a
ambience contained
in the L + R
know
information.
What
is
the
as
redundant with information contained
sound field.
is
completely redundant with information that
only
too
It is
done, therefore,
very quiet
mentioned before,
The
signal.
well,
L + R
nonlocalizing information provides
in a
stereo sound field. This nonlocalizing
But the L + R
a lot
also less vulnerable
signal
quieter (about
is to
the
generate
as a
information contained
pilot signal. This
signal
to
a new
in L + R.
is
already
(mono)
23 dB
worth) than
multipath effects.
L-R
is, as
signal
is
possible
in L - R is
the
the
by
If
you
follow
the
line leading from
the L + R
output
of the
first
matrix block,
shaping blocks,
However, since stereo localization must also
cast
L - R
blocks
anti-log amp)
and
called a leading-edge detector
advantage
When fast,
process occurs, these blocks allow that information
"mix" that occurs
(a
broadcast
you
will
see
that
the
output
signal, this signal
pair
of log
to
L - R. The L - R
of a
psychoacoustic phenomenon
short-term,L
amps,
establish
at the
of
the
- R
summing
it
leads
which
is
A and B, a
information critical
has
also directed
instantaneous ratio between broadcast
signal
and a
junction.
to
phase-randomizer
been designated
be
derived from
to a
differencing amp,
is
also
fed to a
leading-edge amp. These blocks take
known
as the
to the
and
spectral-
as (L -
series
and an
series
precedence effect.
localization
to
become part
the
of
R)'.
broad-
four
of
blocks
L + R
of the
So,
thus
leading-edge detector
feeds
the
Additional circuits, shown
advantage
from
the
regular multiplex decoder
signals modulate
summing junction
anti-log
separation
amp,
far we
second matrix, along with
of the
are
fact
the
via
and
finally
maintained during single-tone tests.
have
r.f.
another pair
the
contributions
at
this summing
at the
that
totally discrete
signal,
the
a.g.c.
junction,
the
lower right
in the
that
information
of log
amp.
of the
unmodified
L and R
system.
amps, a differencing amp,
In
this way, high orders
quiet
the
output
L + R
of the
signals
When.L-
is
conveyed back
(L -
signal.
R)'
of
which
diagram, take
are
available
only
or R-
and the
only
to the
an
of
What your TX1-11
It
can
reduce
and
can and
virtually eliminate weak signal hiss
cannot
do:
and
multipath
distortion
part
of the
It
cannot
in
the L + R
SPECIAL NOTE:
Some tuners
quieter,
into mono
becomes
provided
broadcast. (Almost
fix a
and
are
or to
weak.
all of the
reception problem where
part
of the
receivers,
designed either
automatically switch into mono
(Stereo sound
broadcast.
hiss
in an
to
is
and
all
stations.)
(If the
attempt
blend
sacrificed
the
distortion resides
the
noise
to
make
stereo signals essentially
for
or
distortion resides
station
FM
when
less noisy reception.)
is too far
reception sound
the
in the L-R
stereo signal
gone.)
Here's
If
have a tuner
be
or
accomplished
be
normally provide a greater number
how to
your
necessary
auto
performed
unit's
blend threshold down
tell
if
your tuner
stereo indicator light goes
or
receiver like
to
have your local service center reduce
by a
by a
technician. This
qualified service technician.
the
to the
or
receiver blends
out on
ones described above.
noise floor. Normally this
is not a
of
quiet stereo stations than ever
user adjustment
or
weaker
This
switches
stations
It
the
auto switching
adjustment
will
and
to
you
then
is
must
will
mono:
easily
before.
IN
CASE
1.
LESS-THAN-PERFECT SOUND:
OF
DIFFICULTY
sound
very
good,
A)
CRACKLING: Possibly
the
type
If
you're getting sound,
of bad
car
sound
ignition noise,
can be a
but it
clue
or
noise from electrical
doesn't
to the
problem.
2.
devices
B)
DISTORTION: Probably
REDUCTION.
reflection
C)
HISS
MULTIPATH
D)
HUM: Possibly from cables connecting tuner
your
NO
STEREO: Check
receiver.
in the
AND
NOISE:
and
cables
If
it's
house, like motors, etc.
multipath-induced;
If
that
doesn't
problem
NOISE REDUCTION.
or try new
the
off,
(Multipath).
Most likely caused
ones.
STEREO indicator light
see
special note.
work,
you
might have a very severe
by a
engage
weak signal;
on
your tuner
the
and
preamp. Check
MULTIPATH
try
or
3.
CONTROL SETTINGS: Check
integrated
Speaker
4.
INTERFERENCE:
check
the
amp:
On/Off
following suggestions:
Power On/Off, Source selectors, Stereo/Mono,
(or
Speaker
Depending
all
control settings
selector),
on the
nature
Volume
of the
on
your preamp
or
Gain
controls.
interference,
or
A)
Install your tuner
or
receiver farther away from
transformers,
motors,
cable
and
B)
Make sure your signal cable between your tuner
C)
SERVICE
If
the
TX1-11
Attach a noise suppressor
the
information
is in
noise.
falls outside this
CARVER
CORPORATION
TV
sets,
and
fluorescent lighting. Route
antenna leads from these possible sources
or
good shape
in the
preceding section
manual's
CUSTOMER
scope, please
SERVICE
and
shielded.
to the
electrical equipment causing
doesn't
help,
contact:
the
of
receiver
or the
signal
interference.
and
problem
P.
0. Box 664
Woodinville,
or
call: (206)
Your inquiry will
You
might
return
the
TX1-11 before
center
If
to
Thank
or the
convenient, your Carver dealer should
offer additional assistance.
you for
WA
98072
483-1202
be
promptly responded
be
directed
unit
to the
we can
to a
Carver Authorized Service Center,
factory.
authorize
factory, make sure it's
choosing CARVER.
We
its
return. When shipped
to;
we're
must have
in the
be
consulted
glad
the
serial number
to
help.
to a
original carton,
and
might
or
asked
of the
service
well
be
to
sealed.
able
Carver
Corporation
Limited
Warranty
NOTICE:
warranty information
Carver Corporation
crafted
The
Warranty covers defects
caused
rial number
by
The
nal
If
664,14304
Station
quired. Please
the
tion;
The
following warranty information
for
your area
is
proud
to
perform properly
Carver Corporation Warranty
in
by
accident, misuse, abuse
has
been defaced,
Carver Corporation.
Carver Corporation Warranty extends
dated
purchase
your Carver Corporation product ever requires service, write
or
receive instructions
problem,
return
shipping
receipt
is
N.E.
193rd
Place,
do not
ship
by
the
associated components
costs
will
and
of its
products which have been built with care using advanced technology
for
many years. Carver Corporation
for
materials
or
modified
presented
Woodinville,
to
ship
Parcel Post.
be
prepaid
is
exclusive
locale.
each
of its
products
and
workmanship. However,
operation contrary
or
removed,
to the
whenever
Washington 98072,
the
unit
Be
and
if
repairs
d)
original owner
warranty
to the
factory. Please save
sure
you
have received authorization from Carver Corporation
connections,
were covered
is in
to
damage resulting from modification
and a
to the
United States only. Please
offers
to
you,
the
effect
for
three years from
the
following
instructions specified
or
subsequent owner(s) during
service
is
required.
to or
call Carver Corporation (Attention: Customer Service Department), P.O.
206-483-1202.
the
original
copy
of the
purchase receipt. Initial shipping costs
by the
scope
You
of
see
your Carver dealer
and
owner
of a new
the
are
excluded:
in the
Carver Corporation owner's manual,
will
be
shipping
this
Warranty.
Carver product,
date
of
original retail purchase.
a)
damage caused during shipment,
or
attempted repair
the
three-year warranty period
directed
carton
to an
and
authorized Carver Corporation Service
packing materials
and
or
distributor
premium parts. Your unit
the
following
The
by any
person other than authorized
include a complete description
are not
paid
for the
has
warranty:
Carver Corporation
b)
c)
units where
as
long
as the
in
case shipping
by
Carver Corpora-
correct
been
damage
the se-
origi-
Box
is re-
of
All
implied
warranties, including warranties
this warranty, unless otherwise provided
Carver Corporation's liability
erty
or any
other incidental
Some states
tial damages,
This Warranty gives
chase receipt
Carver Corporation
P.O.
14304 N.E. 193rd Place
Woodinville, Washington 98072
(206)483-1202
Box
do not
so the
to
664
allow limitations
this Warranty
is
limited
or
consequential
above limitations
you
specific
legal
and
keep these
on how
or
rights,
or
by
state law.
to the
repair
damages which
long
exclusions
and you may
merchantability
or
replacement,
an
implied
warranty lasts and/or
may not
also have other rights which vary from state
in a
safe place. Thank
and
may
apply
fitness
for
at our
option,
result from
to
you.
you for
particular
of any
the
failure
do not
your
choice
purpose,
defective product
of
allow
are
limited
and
this product.
the
exclusion
of a
Carver Corporation product.
to
or
state.
in
duration
shall not,
limitation
We
suggest that
to the
three-year length
in any
event, include prop-
of
incidental
you
or
consequen-
attach
your
of
pur-
FROM
TUNER
L
+ R
A/B
SUMMING
15
JUNCTION
Figure
LOG R
1
thecarversite.com
Thismanualiseitheranoriginalscanfromtech'swhoworkedatCarvercorp,donatedbyforum
members,orboth.ThesemanualsareNOTintendedforre‐sale.Ifyoupurchaseda'Carver
Manuals'disconebayoranotherauctionsite,andithasthismaterialonit,youwereripped
off!
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