Nad 4130 Owners Manual

Page 1

4130

AM/FM
STEREO TUNER

INSTRUCTIONS
FOR INSTALLATION
AND OPERATION

Page 2

REAR PANEL

1. Antenna terminals.
2. AM Rod Antenna.
3. Audio Output.

4. AC line cord.

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FRONT PANEL

1. Power.

2. Mono

3. FM NF! Defeat.

4. Tuning Display.

5. FM Stereo Indicator.

6. Tuning Pre-sets.

7. Enter.

8. AM/FM.

9. Uprown Tuning.
10. Search Mode (FM only).

CAUTION: TO PREVENT ELECTRIC

SHOCK DO NOT USE THIS (POLARIZED,
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Page 4

either 3000 antenna terminal and connect the cable shield to
the ground (G) antenna terminal. This unbalanced connec-
tion provides the required 750 impedance for the cable. But
the 3000 antenna terminals are connected to the FM tuner
circuit through an internal balun transformer. The 750
coaxial socket is wired directly to the tuner circuit, bypassing
the balun transformer, so to obtain the best possible sensitiv-
ity, the coaxial cable should be connected to the 750 socket.

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
accidentally touch power lines, either while you are installing
itor later.

2. Include a lightning arrestor in the installation, to
protect both yourself and the tuner circuit from potential
danger during electrical storms.

2. 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 unit.

3. AUDIO OUTPUT

Connect a stereo patch cord from the Left and Right
output jacks to the corresponding Tuner input jacks on
y0ur amplifier.

4. AC LINE CORD

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.

FRONT PANEL CONTROLS

1. POWER

Depress this button to switch on the power. The fre-
quency 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 tuners power consumption is
very low, so the cost of leaving ti 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. 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.

3. FM NR DEFEAT
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
cir0uit 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 DEFEAT 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.

4. TUNING DISPLAY
The digital display shows the broadcast frequency that
the receiver is tuned to.

FM center-tuning. The center tuning indicator, at the .
bottom of the display window, is a bar between two triangular
pointers (arrows). When the receiver is slightly mistuned one
of the triangular pointers glows to show the direction in which
the tuning should be changed; i.e.. if the arrow points to the
right, the right-hand portion of the Up/Down Tuning rocker
should be tapped to increase the tuning frequency slightly.
When an FM station is correctly tuned, the triangular pointers
will vanish and the center-tune bar will glow.

5. FM STEREO INDICATOR

This LED illuminates when a stereo FM broadcast is
being received and decoded by the tuners multiplex decoder
circuit. Note that if the MONO button is engaged, all broad-
casts will be received in mono.

If an FM station is broadcasting only in mono, or if a '
stereo broadcast signal is too weak for reasonably noise-free
reception in stereo, then the tuner will automatically switch
into the mono mode, and this light will not illuminate. Also,
if you have mis-tuned away from the center of a stations
broadcast channel, the stereo decoding circuits may not lock
onto the signal and it may be received only in mono.

6. TUNING PRE-SETS

You can store the frequencies of ten favorite stations
(5 FM and 5 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.

7. ENTER

This button engages the Memory Enter mode. Use this
mode to enter the frequencies of your favorite stations in
the ten pre-sets (five pre-sets on the FM band-and another
group of five 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 (or easy to remember):
alphabetical (1 = WABC, 2 = WCBS, 3 = WNYC . . .), nu-
merical (1 = BBCt, 2 = 8802 . . .), or in order of increas-
ing frequency (1 = 89.7, 2 = 90.9, 3 = 95.3, etc.) If you are
not certain of the frequencies of the stations, check the