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For over three decades, Kenwood
has
continually intro-
duced innovations
in
tuner design
and
engineering.
The
name Kenwood
has thus
become universally recognized for
excellence
in
tuner technology,
and
many satisfied users
will testify that for
them,
the tuner
is
Kenwood. But there's a
whole
lot
more
to
tuners than
the
technology, these days.
The average, non-audiophile also wants to
be
in on the high
quality
FM and AM
broadcast scene, even though
the
budget
is
usually rather restricted.
For
such customers,
Kenwood
has
the answer. At the top of this year's line-up
is
the KT-1000 incorporating the latest
in
tuner
technology,
but
packaged without the frills
to
attract
a
wider market.
A bit
under in terms
of
features and price range comes the KT-
900,
but still offering the superb sound quality expected
of
Kenwood.
Finally, there's
the
totally new-style KT-800,
an
automatic computer-guided tuner that combines excellent
sound quality with unrivalled ease
of
operation. Here's
a
rundown
of
these three great
new
tuners,
and the
sales
points and facts
to
help you sell
them.
New
Pulse
Count
Detector
IC
Conventional FM detection circuits using an analog method
allow
a lot of
chances
for
noise
or
distortion
to be
intro-
duced
to the
original
FM
signals.
In
order
to
faithfully
preserve
the
original characteristics
of the FM
signals,
Kenwood has developed
a new
Pulse Count Detector
IC,
which uses
a
digital method
to
detect the FM signals.
Fol-
lowing
is a
simplified explanation
of
how
it
works.
The wave shapes
of
the individual FM signals are sampled
and the basic wave shape of each are converted into digital
equivalents in the form
of
pulses
of
equal width and ampli-
tude.
Since only
the
basic shape
of the
signals
are
con-
verted into digital equivalents,
any
minor deviations
or
rip-
ples caused by noise or distortion are simply ignored
—
the
result
is a
digital equivalent
of
the pure original
FM
signal,
free from distortion
or
noise and remarkably stable against
changes
in
temperature,
humidity
and
age.
When converted
back into
an
analog
signal,
the
signal
at output
is
exactly the
same as originally input. Any noise
or
distortion that might
have affected
the
signal during the detection process
has
been completely eliminated. This system
is
utilized
in the
KT-1000 and KT-900.
Direct
RF
Conversion
When there
are
many powerful
FM
stations
and
other
sources competing for air
space,
extraneous signals are all
too easily picked
up by the FM
antenna
and
amplified,
introducing a great
deal
of
noise
and
distortion.
To
eliminate
such interference, Kenwood
has
developed
a
Direct
RF
Conversion technique. This by-passes
the RF
amplifier
stage,
sending signals instead directly
to the
mixer stage,
where
the
intermodulation products produced
by the
interference
of
extraneous signals
are
attenuated rather
than amplified. Either Direct RF Conversion
or
normal
con-
version can be selected by a
switch,
allowing the choice of
the method most suitable to the particular reception condi-
tions.
This system
is
utilized in the KT-1000.