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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
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