NAD 4300 User guide

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MONITOR
SERIES
INSTRUCTIONS
FOR
INSTALLATION
AND
OPERATION

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REAR PANEL
1. AM Rod Antenna.
5. Output Jack s.
2. AM Antenna Terminal s.
6. AC Convenience Outlet (not in U.K. model ).
3. FM Antenna Input. 7. AC Line Cord.
4. Output Level Control.
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3
FRONT PANEL
1. Power.
2. Station Pre-sets.
3. Memory Enter.
4. Tuning Display.
5. FM Stereo Indicator.
6. FMX Indicator.
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7. AM / FM .
8. F MXOff.
9. FM NR Off.
10. Mono.
11 . Tuning.
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REAR PANEL CONNECTIONS
1.
AM
ROD ANTENNA
The ferrite
rod
antenna provides effective reception
of local medium-wavelength
AM
radio stations. The
rod
is
mounted
on
a pivot. For best reception, swing
it
away from
the metal chassis of the receiver.
2.
AM
ANTENNA TERMINALS
Since the tuner is equipped with a ferrite
rod
antenna,
no external antenna will be needed for satisfactory reception
of most local broadcasting stations. But if you wish to
improve reception of distant
AM
stations, attach a long-wire
outdoor antenna to the
AM
terminal.
As
its name implies, a
"long-wire" antenna
is
a simple, straight wire whose length
may
be
anything from a few feet up to about
100
feet
(30 meters), mounted parallel to the earth and
as
high
as
is convenient.
In
some cases the effectiveness of a long-wire antenna
will be improved by connecting a second wire from the
Ground
(G)
terminal to a true earth-ground, i.e. a copper-
plated
rod
driven several feet into the earth. A substitute
electrical ground may also prove effective: a cold-water
pipe, a steam radiator, or the third hole of a modern elec-
trical wall socket.
3.
FM
ANTENNA INPUT
The
FM
antenna input socket
is
designed to accept a
75-ohm "co-axial" cable. This type of shielded cable
is
employed with community cable systems, apartment building
master antenna systems, and most roof-mounted antennas.
If
you want to connect
an
antenna with a 300-ohm
twin-lead wire, use a "balun" (an adapter containing a
300-to-75-ohm transformer).
An
antenna must be connected to the tuner for effective
reception of stereo
FM
broadcasts. A ribbon-wire "folded
dipole" antenna and a balun adapter are included to get you
started. When you stretch out the ribbon-wire antenna you
will note that
it
is
in
the form of a T The "crossbar" portion
of the T should be stretched out horizontally and tacked
in
place
(on
a wall,
on
the back of a cabinet, or on the floor).
The "vertical" section of the T goes to the tuner's antenna
input. Connect its two wires to the screw terminals
on
the balun adapter; then plug the balun into the tuner's
FM
input socket.
In
view of the exceptional sensitivity of this tuner, you
may find that the ribbon-wire dipole antenna
is
all you need
for reception
of
strong local stations. But this simple antenna
is not very efficient at rejecting "multipath" and other forms
of
FM
interference, and
it
cannot easily
be
rotated to
optimize its pickup pattern for best reception of stations
in
different directions. Therefore,
in
most cases you should
use a better antenna. The recommended options,
in
order
of increasing cost, are
as
follows:
(1)
A basic "rabbit-ears" indoor TV antenna without
auxiliary coils or tuning switches. Electrically, such
an
antenna
is
just another dipole (similar to the ribbon-wire
antenna). But since its tuned elements are made of solid
metal,
it
can easily
be
rotated. Stretch out each of its two
arms
to
a length of 30 inches (75 cm), and orient them
horizontally or
at
a shallow angle (less than 45 degrees
upward). The ribbon wire emerging from the antenna's base
should be connected to the balun adapter's screw terminals
Th
lightning flash wi
th
arrowhead. within
an
equilate
ral
angle,
is
intended to alert
th
e u
se
r of the presence of
ninsulated
'"
dangerous voltage·· within the produc
t"
s enc
lo-
sure; that may be of sufficient magnitude to constitute a
risk
of
electric shock to persons.
3
in
place of the simple ribbon-wire antenna.
Now
, for each
station
in
turn, after you tune the station you can rotate the
antenna for best reception.
(2) A more elaborate rabbit-ears indoor TV antenna
with a tuning switch. This type of antenna does NOT have
greater sensitivity than the simpler rabbit-ears unit, so
if
your
problem
is
that the signals you want to receive are weak
(as shown
on
the signal-strength meter), then
an
outdoor
antenna
is
the only effective solution. But
in
cities
and
in
large buildings where signals are strong but are contami-
nated by reflected "multipath" interference, the tuning switch
on
an
elaborate indoor antenna may improve recepti
on
by
reducing the interference.
(3)
An
electrically tuned indoor antenna. Again, such
antennas usually do not provide any advantage over the
simplest type of "rabbit-ears" unit for receiving weak signals.
But where strong signals are contaminated with interference,
the antenna's aiming and tuning controls can reject the
interference and yield cleaner reception.
(4)
An
outdoor antenna. Even the finest indoor antenna,
no
matter how elaborate, cannot fully exploit the capabilities
of a good
FM
tuner. For the lowest noise, minimum distor-
tion, and largest choice of well-received broadcasts,
an
outdoor antenna is the best complement
to
a fine tuner.
A roof-mounted antenna has three fundamental ad-
vantages. First, its large size yields better sensitivity (pulling
in
a stronger signal from the desired station) and a narrower
directional pattern for more effective rejection of multipath
reflections arriving from other directions. Second, its loca-
tion
on
a roof or tall mast places it above many sources of
interference-passing
cars and buses, other buildings, etc.
Third, the strength of received
FM
signals
is
directly pro-
portional to the height of any antenna above the ground.
If
you already have
an
outdoor television antenna, using
a splitter to extract
FM
signals from
it
may produce excellent
results. However, many TV antennas are deliberately de-
signed to
be
relatively weak at
FM
frequencies
in
order
to
minimize potential interference with TV signals
at
nearby
frequencies (Channel 6
in
the
U.S
.
).
You
may
be
able to use
a splitter to extract
FM
signals from
an
apartment building's
master TV antenna system, but usually this yields poor
results because many master antenna systems have
"traps" to stop
FM
signals.
The best choice
is
a directional FM-only antenna,
mounted
as
high above ground
as
is
practical, and sepa-
rated by
at
least two meters (7 feet) from other antennas,
vertically and horizontally. If desired stations are located
in
different directions (more than 90 degrees apart), the
antenna should be mounted
on
a rotor for aiming. Brand
names of good
FM
antennas
in
the U.
S.
include Jerrold,
Finco, Wineguard, Antennacraft, and Archer (Radio Shack).
Use shielded lead-in cable rather than plain "twin-lead"
wire, both to minimize interference and to preserve strong
signals during years of weathering. The cable may be either
75-ohm coaxial or a shielded 300-ohm type. Disconnect
any indoor antenna from the tuner before connecting the
outdoor antenna.
If
you install
an
outdoor antenna yourself, observe these
important CAUTIONS:
1.
Do
not mount the antenna close to electric power
lines. Plan the installation so that the antenna mast cannot
Th
exclamation point within
an
equilateral triangle is intended
alert the
us
er of the presence of important operating and
maintenance (servicing) instructions
in
the literature
accompanying the appliance.

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accidentally touch power lines, either while you are installing
it or later.
2.
Include a lightning arrestor
in
the installation, to
protect both yourself and the tuner circuit from potential
danger during electrical storms.
4.
OUTPUT LEVEL CONTROL
This control varies the volume level of the tuner's output.
You
may leave it set at maximum, or you may use this control
to adjust the tuner's output so as to minimize any change
in
volume level when you switch your amplifier
from PHONO to TUNER.
5.
OUTPUT JACKS
Connect a stereo patch cord from the Left and Right
output jacks to the corresponding Tuner input jacks on
your amplifier.
6.
AC
CONVENIENCE OUTLET (not
in
U.K. model)
The AC power line cord of another stereo component
may
be
plugged into this accessory outlet.
It
is
an
"un-
switched" outlet, unaffected by the Power button.
7.
AC
LINE CORO
Plug the AC line cord into a Switched outlet on your
amplifier, or into any AC wall outlet that provides the correct
power-line voltage.
4
FRONT PANEL CONTROLS
1.
POWER
Depress this button to switch on the power. The
frequency display will illuminate when the power
is
on.
To
switch the power off, press the button again and release
it.
In
many installations
it
may
be
more convenient to leave
the tuner's POWER switch permanently engaged, letting the
tuner be turned on and off by a "switched" convenience
outlet on your amplifier.
If you prefer, you may plug the tuner's AC line cord into
an
Unswitched outlet or directly into a wall socket, and leave
it
permanently turned on. The tuner's power consumption
is
very low, so the cost of leaving
it
always on would
be
only a
few dollars per year; and the useful life of the tuner would
not be shortened by leaving it on.
2.
STATION PRE-SETS
You
can store the frequencies of sixteen favorite stations
(eight
FM
and eight
AM
)
in
these pre-sets, using the ENTER
button. Then, to tune those stations from day to day, just
press the appropriate pre-set button.
The pre-sets preserve their frequency assignments
when the power
is
switched off, or when the AC line cord
is
unplugged, for a period of at least two weeks. Thus you can
re-arrange your stereo system, or move the equipment from
room to room, without losing the pre-set frequencies. But
if
you leave the power off for a month or more, you may have
to re-program the tuning pre-sets.
3.
MEMORY ENTER
This button engages the Memory Enter mode. Use this
mode to enter the frequencies of your favorite stations
in
the sixteen pre-sets (eight pre-sets on the
FM
band and
another group of eight pre-sets on
AM).
The procedure
is
as follows.
(1)
Decide which station you want to assign to each
pre-set. On each band you may arrange the stations
in
any
order that you find convenient to
USE:
or easy to remember:
alphabetical
(1
=WABC, 2 =WCBS, 3 =WNYC
..
.),
numerical
(1
=
BBC1
, 2
=
BBC2
...
), or
in
order of
increasing frequency
(1
=89.7, 2 =90.9, 3 =95.3, etc).
If
you are not certain of the frequencies of the stations,
check the station/frequency directory
in
a local newspaper
or broadcasting guide.
(2)
Select the
FM
or AM band, as appropriate. Using the
Tuning control, manually tune to the first station on your list.
Check the signal-strength display (AM) or center-tune indica-
tor (FM) to be sure that you have tuned precisely to the
center of the station's broadcast channel. Press the ENTER
button, then press Pre-set # 1 to store the first station
in
the
tuner's memory. (NOTE: After you press ENTER, you will
have approximately ten seconds to store a station
in
one of
the pre-sets. After that interval, the ENTER mode will auto-
matically de-activate.)
(3)
Tune
to the second station on your list. Press the
ENTER button and, within ten seconds, press Pre-set
#2
to
store the second station.
(4)
Tune
to the third station on your list, press ENTER,
and press Pre-set
#3
to store the station. Continue
in
this
manner with any other stations that you want to store
in
the
remaining pre-sets. Then switch
to
the other tuning band
(FM or
AM
)
and repeat the process for the second set of
five pre-sets.
Incidentally,
if
you make a mistake or change your
mind,
it
is
not necessary to re-program all eight pre-sets
in
sequence.
You
can re-program any pre-set simply by tuning
to the desired frequency, pressing ENTER, and pressing the
pre-set that you want to re-program.
After you finish programming the pre-sets, you may wish

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to
post your list of stations and associated pre-set numbers
nearby for reference.
CAUTION:
In
day-to-day operation, be careful not to
press the ENTER button by accident. Doing so will activate
the ENTER mode, and if you then press any of the pre-set
buttons you will unintentionally re-program that pre-set.
You
would then have
to
manually
re
-tune to the station you
wanted, and re-ENTER
it
into the pre-set.
If
you press ENTER accidentally, you may wait ten
seconds for the ENTER mode to disengage. Or you can
immediately force the tuner out of the ENTER mode,
in
either of two ways: switch to the other tuning band
(e
.g
.,
from
FM
to
AM
and back), or turn the Tuning knob to
changethefrequenc1
4.
TUNING DISPLAY
This display
is
in
three parts: frequency, signal strength,
and tuning.
FREQUENCY The numerical display shows the tuned
frequency.
SIGNAL STRENGTH. The signal strength meter
is
a
series of five bars. The number of illuminated bars increases
with the strength of the received signal.
If
only one or two
bars illuminate, the signal
is
too weak for noise-free recep-
tion
in
stere9, but reception may
be
satisfactory
in
mono.
Strong signals are indicated by four or five illuminated bars.
The greatest benefit of FMX noise-reduction occurs at signal
strengths from two to four bars.
TUNING. The center-tuning indicator (FM only) consists
of
an
illuminated rectangular bar and two triangular pointers.
The pointers glow when the tuning
is
within
an
FM
station's
channel but not at the center of that channel. The orientation
of the illuminated pointer shows whether the tuning fre-
quency should be increased or decreased.
If
the indicator
points upward, rotate the Tuning knob clockwise to increase
the frequency. If the indicator points down, turn the knob
counter-clockwise
to
decrease the frequency. When the
broadcast
is
accurately center-tuned, the triangular pointers
fade out and only the middle bar
is
illuminated.
On
the
AM
band, tune for maximum signal strength.
5.
FM
STEREO INDICATOR
This LED illuminates when a stereo
FM
broadcast
is
being received and decoded by the tuner's multiplex decoder
circuit. Note that
if
the MONO button
is
engaged, all broad-
casts will
be
received
in
mono.
6.
FMX INDICATOR
This LED illuminates when an FMX broadcast
is
being
received and decoded by the tuner's FMX circuits. The FMX
noise-reduction circuit operates automatically when you tune
to
an
FMX-encoded broadcast. When you tune to non-FMX
broadcasts the FMX circuit
is
bypassed.
The FMX circuits will not operate, and the FMX indicator
will not light,
if
the FMX OFF button is engaged.
7.
AM
/
FM
This button switches between the two tuning bands:
FM
or medium-wave
AM.
The digital tuning display shows
the tuned frequency
in
MHz (for FM) or kHz (for AM).
The tuning circuit has a "last station selected" memory.
When you switch between tuning bands, the circuit automati-
cally re-tunes the last station that you were tuned to when
you previously used that band.
8.
FMX OFF
For normal operation, this button should
be
disengaged
(out).
At
this setting, when
an
FMX-encoded broadcast
is
received, the tuner detects a
10
Hz pilot tone
in
the broad-
cast and automatically switches the FMX decoder into the
signal path to provide up to 20 dB of stereo noise reduction.
5
When a non-FMX broadcast
is
tuned, the FMX decoder
is
automatically bypassed.
When the FMX OFF button
is
pressed, this automatic
operation
is
defeated and the FMX decoder
is
bypassed, so
that FMX-encoded broadcasts will
be
received
in
conven-
tional stereo without noise reduction.
9. FM
NROFF
The tuner contains
an
FM
Noise Reduction circuit that
automatically reduces noise
in
weak
FM
stereo signals
by
reducing the stereo separation. As the received signal
becomes weaker and the stereo subcarrier becomes
noisier, the circuit automatically reduces the contribution of
the stereo subcarrier to the final sound, obtaining the best
practical compromise between quieting and subjective
image breadth. Even with maximum noise reduction, the
circuit maintains enough channel separation to produce a
stereo image that
is
appreciably wider and more spacious
than mono.
For normal operation of the circuit, leave the button
OUT.
The
FM
noise-reduction circuit operates only on those
weak stereo
FM
signals that would be noisy without
it.
It
does not affect the reception of strong signals.
If you want to turn off the noise-reduction and restore
full stereo separation, press the
FM
NR OFF button.
You
may not hear
an
obvious difference when this button
is
pressed, since most broadcast signals are strong enough
to disengage the circuit automatically.
10. MONO
The MONO button disables the stereo
FM
circuits
in
the tuner.
Normally the tuner receives monophonic
FM
transmis-
sions
in
mono and automatically switches on its multiplex
decoding circuits when a stereo
FM
broadcast
is
received
(as shown by the
FM
STEREO indicator). But when a very
weak
FM
stereo signal
is
received,
it
may be excessively
noisy because of the multiplex encoding technique used for
stereo broadcasting.
In
that case, depress the MONO button
to lock the tuner
in
the mono mode,
in
order to obtain
consistently quieter and cleaner sound.
Remember to disengage the MONO button when you
re-tune
to
a stronger signal. As long as the MONO button
is
engaged,
no
broadcasts can be received
in
stereo.
11.
TUNING
Rotation of the tuning knob generates digital pulses that
increase or decrease the tuned frequency
in
small steps. The
minimum tuning increment
is
0.05 MHz for
FM.
For the
AM
band the tuning step is
10
kHz
in
North America
(9
kHz
in
Europe and elsewhere).
To
increase the tuned frequency, turn the knob to the
right (clockwise).
To
decrease the tuned frequency, turn the
knob to the left (counter-clockwise).
NAD ELECTRONICS
BOSTON/LONDON
Cl
1986
av
NAO
364 PRINTED
IN
TH
EUS
A