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Marantz Model 4300 Manual

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TECHNICAL
DESCRIPTION
GENERAL
Figure 14
is
a block diagram
of
the model 4300
Stereo 2 + Quadradial 4 Receiver showing main
functional elements and
input
and
output
signal
routing. PHONO INPUT jacks
are
provided
for
the
front
pair
of
channels.
FUNCTIONAL
DESCRIPTION
FRONT END
FM
antenna
signals
are
applied through a balun
transformer
to
the antenna coil which drives a
field-effect transistor RF amplifier. The
signals
from the
RF
amplifier
are
fed through the double-
tuned RF tank
circuit
to
the F
ET
Mixer
stage,
which
is
also
fed by the signal generated by a
local oscillator. Carefu
I attention
to
its thermal
and
electrical characteristics
has
minimized
drift,
thus obviating the necessity
for
AFC. The 10.7
MHz converted
signal
is
then fed
to
a phase-linear
ceramic
IF filter, followed
by
the limiter. The
output
of
the
FM
discriminator
is
fed
to
a buffer
amplifier which then drives the demodulator.
IF STAGES
The
IF section consists
of
six transistors and
three
stages
of
dual element ceramic filters.
The characteristics
of
these
filters
are
ideal in
that
the
200KH.z.
passband
is
phase-linear,
with
sharp
cutoff
slopes.
This exceptional
phase
linearity
assures
the elimination
of
a major source
of
high-
frequency distortion
and
a
loss
of
stereo
separa-
tion. The sharp
cutoff
slopes
provide improved
selectivity, permitting reception
of
closely
spaced
channels.
LIMITER
The Model 4300 utilizes symmetrical diode limit-
er
circuits consisting
of
high-performance Gold
Bond Hot Carrier type diodes
and
IF limiter
amplifier
with
a very small dynamic symmetrical
aperture, eliminating the
need
for
an
AGC circuit
wh
ich introduces low frequency distortion.
Un-
desirable amplitude modulation (AM
signals,
AM
noise, AM distortion)
are
removed from the IF
signal
within
the limiter.
FM
STEREO DEMODULATOR
The stereo composite
signal
obtained from the
buffer amplifier
is
first led
to
the FET muting
circuit; then
to
the
phase
locked loop stereo
demodulator
IC
circuit and decoded
into
both
left
and
right channel
signals.
Each
left
and
right
channel
signal
is
then applied
to
the 16KHz
low
pass
filter
(LPF) and de-emphasis networks
to
remove the undesired switching carrier signal in
the audio
signals.
Next,
each
audio signal
is
ap-
plied
to
the audio amplifier consisting
of
NPN·
PNP
direct-coupled transistors and amplified
to
the required
signal
level
of
about 775mV
RMS.
Finally,
each
amplified signal
is
led
to
the
SELECTOR Switch.
The multiplex stereo demodulator
circuit
con-
sists
of
a
phase
locked loop
Ie
and
is
equipped
with
a
separate
automatic Stereo/Monaural switch-
ing circuit. The circuit checks the
input
signal
intensity
and
actuates the stereo demodulator
and
stereo indicator lamp automatically, when the
input
signal
is
of
sufficient strength
to
provide
high quality stereo reception.
When
the
input
signal
intensity
is
insufficient
for
this purpose,
the stereo
signal
is
automatically changed
to
a
monaural signal
to
insure reception
with
a high
quality signal-to-noise ratio.
MUTING CIRCUIT
In the
absence
of
an
FM carrier, all FM receivers
produce inherent noise. The muting circuit elim-
inates this noise, providing noise - free tuning
from station
to
station.
A muting circuit, consisting
of
a two-transistor
noise amplifier
and
a three-transistor (including
FET) switching circuit,
has
been
incorporated
in the Model 4300. The muting
circuit
perfectly
mutes
out
all the inter-station noise and
also
com-
pletely mutes
out
the side slope spurious
response
of
the unit. The circuit
has
been
designed
to
minimize annoying
"pop"
noise
for
velvet smooth
tune-in and tune-out.
AM TUNER
The
AM
TUNER portion
of
the 4300
is
compos-
ed
of
one IC circuit (including
RF
amplifier,
local oscillator, mixer, IF amplifier, detector
and
a
signal
strength indication amplifier)
and
one
transistor amplifier
to
amplify the detected audio
signals.
A three-section variable capacitor im-
proves spurious
response
ratio.
The ceramic
filter
utilized in the AM IF amplifier
comes
with
high selectivity
and
wide band-
width
for
interference-free hi-fi reception.
18
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