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RECEIVING FM BROADCASTS
Five basic controls are used to receive
FM broadcasts through the 430:
FUNCTION, VOLUME, BALANCE,
TUNING, and FM MUTING. Make the
following adjustments to these controls
after activating the SPEAKERS 1 switch:
[1] FUNCTION
- FM Stereo
[2] BALANCE
- Neutral
[3] FM MUTING - Out
[4] TUNING
- Use this control to
move the dial
pointer to the
extreme end of the
dial scale.
[5] VOLUME
- Advance until hiss
is audible
You should now hear a mild hissing or
rushing sound - this is atmospheric
noise picked up by the tuner section.
Depress the FM MUTING button and the
noise disappears - it has been muted.
Turn the TUNING knob in either direction
until a broadcast signal is received.
The signal strength tuning meter should
have deflected and should now be
registering the relative strength of the
FM signal you are receiving. If the
broadcast is in stereo, the red STEREO
beacon is lit - the beacon does not
illuminate when an FM station is broad-
casting monophonically. If you have
a stereo station tuned, turn the FUNC-
TION switch to FM. The 430 is now
receiving the stereo broadcast mon-
ophonically. This feature is useful for
weak stereo stations where reception is
accompanied by a large amount of noise.
The program can be received mono-
phonically without the noise. Very weak
monophonic stations may be received if
FM MUTING is defeated, but tuning from
station to station is no longer noise-free.
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Muting Adjustment
There is a control on the rear panel
labeled MUTING ADJ. It controls the
signal threshold at which muting action
takes place when the FM MUTING
button is activated. The control has been
set at our factory to accommodate the
majority of FM reception conditions.
If you wish to readjust this control,
depress the FM MUTING button and tune
away from any station. Turn the
MUTING ADJ control until the interstation
noise (hiss) disappears.
The dial scale of the 430 is calibrated
for FM broadcast station frequencies
from 88 to 108 mHz. Each FM station in
your area has an assigned frequency that
falls within these limits. You can use
the illuminated dial pointer and scale of
the 430 to find any station in your
area if you know the assigned frequency.
Similarly, AM stations in your area have
assigned frequencies ranging from
about 550 kHz to 1600 kHz. These, too,
can be found with the illuminated
pointer and dial scale. For convenience,
a third logging scale with arbitrary
values from 0-100 is provided so you can
simplify the task of memorizing the
various assigned frequency values of
the FM and AM stations in your area.
With the logging scale, all you need
remember is that if your favorite FM
station is at 80 on the logging scale,
select FM, tune to 80, and listen.
These two examples give you a
working familiarity with the primary
controls of the 430.
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