Kenwood Tv Receiver Kt 1000 Users Manual

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KENWOOD

KT-IOOO
KT-900
KT-800

Sales Manual

PULSE COUNT DETECTOR

TUNER

Product policy
For over three decades, Kenwood has continually introduced 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 KT900, 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 introduced 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. Following 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 amplitude. Since only the basic shape of the signals are con-

verted into digital equivalents, any minor deviations or ripples 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 conversion can be selected by a switch, allowing the choice of
the method most suitable to the particular reception conditions. This system is utilized in the KT-1000.

Independent Power Supply
For Local Oscillator
One consequence of the relatively high impedance of
power supplies is that leakage from the +B line of the
power supply unit can feed back to the local oscillator to
modulate the local oscillator frequency. This causes tuning
inaccuracies by deflecting the tuned frequency above and
below its optimum level. Kenwood engineers solved this

problem by eliminating the source itself — the + B line to
the oscillator, giving the local oscillator its own independent
power supply. With two power supplies, noise due to leakage is virtually non-existent, even at 100% modulation. In
the KT-1000, this is perfectly utilized.

High Quality AM Section
In the past, AM sections of FM/AM stereo tuners have
tended to be neglected because of the generally inferior
quality of AM broadcasts. Now, Kenwood tuners are fully
able to reproduce the upgraded AM broadcast quality, with

AM sections that are as carefully designed as FM sections.
In the KT-1000 an IF band selector is provided for the AM
section.

Sample-And-Hold
MPX Circuit
As with the Pulse Count Detector, Kenwood engineers have
taken advantage of the exceptional accuracy of digital processing with the introduction of the Sample-and-Hold multiplex decoder. This circuit cleanly extracts the left and right
channel signals from the composite FM signal carried by
the 38 kHz subcarrier frequency. The wave peaks are converted into digital equivalents in the form of pulses. Since
only the basic shape of the waves are converted into digital
equivalents, transient deflections in the shape of waves

caused by noise or distortion are ignored. This greatly
reduces the need for filtering, which vastly improves channel separation, because filtering can obscure important
information in the composite signal, interfering with the ability to isolate left and right channel signals. The peak pulses
are sampled then held in a capacitor until the next peak arrives; thus, the average peak value can be instantly adjusted
for precise representation of the original 38 kHz subcarrier.
The KT-1000 employs this superior type of MPX decoder.

Quartz Synthesizer
Preset Tuning
Kenwood's quartz-PLL tuning circuit uses the ultra-stable
oscillating frequency of a quartz crystal to keep the frequency generated by the local oscillator locked to the exact
tuning frequency. The quartz-PLL circuit can be preset to
automatically tune to any one of any combination of as
many as eight different FM or AM stations. To preset, the

desired station is manually tuned in, and then the preset
button is pressed, after which any one of eight station
buttons may be pressed. Whenever that station is desired,
pressing the station button previously selected will
automatically tune the station. This system is fully utilized in
the KT-800.

Sales Points

Key Specs

KT-1000

FM usable sensitivity: 23.3 dBf (8.0>V) in Direct
RF Conversion mode 10.3 dBf (1.8/A/) in normal
mode
FM THD at 1 kHz: 0.03% (mono), 0.04% (stereo)
Alternate channel selectivity: 65 dB at 300 kHz
(NARROW) 45 dB (WIDE)
Stereo separation at 1 kHz: 60 dB (WIDE), 50 dB
(NARROW)
Signal-to-noise ratio: 90 dB (mono), 85 dB (stereo)
Frequency response: 15 Hz to 15 kHz ±0.5 dB

• Pulse Count FM Detector
• Direct RF Conversion with Selector
• Dual-gate MOS-FET front-end with 5-gang tuning
capacitor
• Sample-and-Hold multiplex decoder
• Independent local oscillator power supply
• Servo-lock tuning
• High quality design AM section
• Narrow and Wide IF band selection for both FM
and AM

KT-900

FM usable sensitivity: 10.8 dBf (1.9^V)
FM THD at 1 kHz: 0.03% (mono), 0.04% (stereo)
Alternate channel selectivity: 65 dB at 300 kHz
(NARROW) 45 dB (WIDE)
Stereo separation at 1 kHz: 55 dB (WIDE), 47 dB
(NARROW)
Signal-to-noise ratio: 88 dB (mono), 83 dB (stereo)
Frequency response: 30 Hz to 15 kHz +0.2 dB,
-0.8 dB

• Pulse Count FM Detector
• Dual-gate MOS-FET front-end with 4-gang tuning
capacitor
• Servo-lock tuning
• High quality design AM section
• Dual-color signal strength and fine-tuning LED
indicators
• Digital frequency display
• Clean reception filter
• Narrow and Wide IF band selection for FM

KT-800
New, clean panel with store-away control pocket
Quartz synthesizer tuning
8-station FM/AM preset memory bank with illuminated indicator panels
Preset automatic selection of up to 8 FM or AM
stations
FM/AM preset station random access
2-ganged AM tuning capacitor for high AM reception quality
Operational convenience and flexibility
Switchable digital display of frequency or time as
needed
New signal strength and fine-tune display
Automatic stereo muting

•
•
•
•
•
•

FM usable sensitivity: 10.8 dBf (1.9/iV)
FM THD at 1 kHz: 0.07% (mono), 0.09% (stereo)
Alternate channel selectivity: 60 dB
Stereo separation at 1 kHz: 50 dB
Signal-to-noise ratio: 74 dB (mono), 71 dB (stereo)
Frequency response: 30 Hz to 15 kHz +0.2 dB,
-2dB

Operating Features
O Power switch
O LOCK/AUTO BLEND/MUTING switch.
©FM REC CAL switch. Built-in tone
Activates servo-lock system simultaneoscillator helps achieve accurate recously with automatic muting for weak staord level settings on tape deck.
tions to maintain minimum acceptable
©FM/AM IF BAND selector. With Wide noise level. Indicator for "Muting On"
and Narrow band settings. Wide-band ©FM RF selector. Direct or Normal RF
conversion, with indicator for Normal
indicator.

setting.
© FM/AM selector
© Signal strength meter
©Tuning meter
© STEREO indicator
©SERVO-LOCK indicator. Shows lock
tuned status after hand is released from
tuning knob.
© Touch-sensor tuning knob.
May be deactivated for normal
tuning.

© IF BAND WIDE and NARROW selector
© LOCK switch. Selects between servolock tuning and normal fine-tuning.
©REC CAL selector. Oscillator tone
establishes reference for correct tape
recording levels.
© FM/AM selector

© Digital frequency display.
©Tuning direction indicator. Red indicates off-tuned status, green indicates
precise tuning point.
©Signal-strength display. Shows relative strength of tuned signal.
©Touch-sensor tuning knob.
May be deactivated for normal
tuning.

© POWER switch
©LED mode indicators. Stereo, Narrow
IF band, servo-lock, AM, FM.
©AUTO/MUT and MONO mode selector. Auto-muting automatically maintains acceptable minimum noise level
for weak stations.

To activate automatic muting mode to
©TUNER OFF/ON switch. Selects be ©CLOCK ADJUST button. Used tomaintain acceptable minimum noise
gether with nearby Hours and Minutes
tween tuner operation or digital clock
threshold at all times in both FM and AM.
buttons to set correct time.
only. Power is supplied constantly to
digital clock.
©TUNING buttons. To tune automatically © FM/AM selector
up or down the frequency bands. These ©PRESET control button. Preliminary
© DISPLAY switch. Selects between disswitch to activate preset station memplay of frequency being tuned in and time. buttons double as clock-adjustors.
ory for storage.
© MUTING selector with LED indicator.
© Digital frequency/time
display. With FM or AM displays
© TUNED,STEREO indicators.
New vertical signal strength
display
© Preset station keys.
8-station bank allows instant random access to preset FM and AM
are used with Preset control
button for memory storage.

o © © © ©©©

Specifications
KT-900

KT-1000

FM TUNER SECTION

Usable Sensitivity
50dB Quieting Sensitivity
(Mono)
(Stereo)
Signal to Noise Ratio
(Mono)
(Stereo)
Total Harmonic Distortion
Mono
100Hz
1 000Hz
6 000Hz
15 000Hz
50 — 10 000Hz
Stereo
100Hz
1 000Hz
6,000Hz
15 000Hz
50 —10 000Hz
Capture Ratio
Alternate Channel Selectivity
Stereo Separation
1 000Hz
50 — 10 000Hz
15 000Hz
Frequency Response
Spurious Response Ratio
Image Response Ratio
IF Response Ratio
AM Suppression Ratio
Subcarrier Product Ratio
Antenna Impedance

. 10.8dB*(1.9pV)

10.8dBf (1.9f/V)

16 4dBf(3 6^V) 29 3dBf(16/jV)
37 3 r i R f (4U,JV1 4 9firiRfdfifiuW

. 16.4dBf (3.6JJV)
. 37.3dBf (40f/V)

16.4dBf (3.6fjV)
38.4dBf (46 V)

90dB
85dB

. 88dB
. 83dB

74dB
71dB

WIDE

NARROW

WIDE

60dB
47dB

50dB
35dB

. 55dB
•
47dB
50dB
40dB
. 45dB
35dB
36dB
. 37dB
30Hz to 15,000Hz + 0.2dB, -0.8dB .. . 30Hz to 15,000Hz + 0.2dB, -2dB
110dB
. 120dB
80dB
. 90dB
. 100dB
90dB
60dB
. 70dB
68dB
. 300 ohms balanced
300 ohms balanced
& 75 ohms unbalanced
& 75 ohms unbalanced
88MHz to 108MHz
. 88MHzt0 108MHz
. 0.75V, 1.8k ohms
0.75V, 5.6k ohms

10HV

.. .

52dB
0 2% .
7f)riR
30dB (WIDE), 50dB (NARROW)
0.25V, 2.2k ohms
Oto0.5V, 2.2k ohms

GENERAL

0.07%
0.07%
0.11 %

. 0.03%
. 0.03%
. 0.05%
0.05%
. 0.09%
. 0.05%
. 0.04%
. 0.07%
0.5 %
. 0.18%
. 1.0dB
. 45dB

88MHzto 108MHz
0 75V 2 2k ohms
Oto 1.5V, 2.2kohms

AM TUNER SECTION

NARROW

0.04%
0 15%
03 %
0.07%
0.3%
03 %
03 %
0.3 %
1.0 %
0.6 %
2 OdB
65dB (300kHz)

120dB
90dB
110dB
70dB
73riR
75 ohms unbalanced

Usable Sensitivity
Signal to Noise Ratio
Total Harmonic Distortion
Image Rejection
Selectivity
Output Level
Fixed
400Hz30% Modulation Variable

M

0 03%
0 03%
0 05%
0 04%
0 08%
0 04%
0 04%
0 06%
04 %
0 12%
0 8dB
45dB

40rlR
15H7to15.0n0H7+0.5riB

FM Frequency Range
Output Level
Fixed
1,000Hz 100% Modulation Variable

KT-800

NORMAL
DIRECT
10 3dBf(1 8MV) 23 3dBf(8 0^V)

0.04%
0.15%
0.4 %
0.07%
0.4 %
0.3 %
0.3 %
0.3 %
1.0 %
0.6 %
2.0a B
65dB (300kHz)

0.12%
0.15%
0.09%
0.14%
0.4 %
1.5dB
60dB

. <3.,V
. 52dB
0.4%
. 45dB
. 58dB
. 0.15V, 2k ohms

18 V
50dB
M

40dB
50dB
0.25V, 5.6k ohms

1?0V
. 60Hz120V
. (U.S.A. & Canada Model)
(U S A & Canada Model)
or 50/60Hz 110 — 120/220 — 240V.. . or50/60HZ110 — 120/220 —240V.. .
switrhahlp
. switchable
0 1HA
. 0.25A
. 440x78x 390mm
440* 123x388mm
. (17-5/16"X3-1/16"X15-11/32")
(17-5/16" x 4-27/32" x 15-9/32")
. 5.1kg (11.2lbs)
6.5kg (14.3lbs)
fif1H7

Power Requirements

Power Consumption
Dimensions (W* Hx D)
Weight (Net)

60Hz 120V
(U.S.A. & Canada Model)
or 50/60Hz 110 — 120/220 — 240V
switchable
0.1A
440x52x247mm
(17-5/16"x 2-1 /32" x 9-23/32 )
2.2kg (4.8lbs)

Kenwood follows a policy of continuous advancements in development. For this reason specifications may be changed without notice.

• Please direct all technical inquiries to:

K E N W O O D ELECTRONICS, INC.
1315 E W a t s o n c e n t e t Rd, C a r s o n . C a l i f o r n i a 9 0 7 4 5 .
75 S e a v i e w Drive, S e c a u c u s , N e w J e r s e y 0 7 0 9 4 .
1098 N o r t h Tower Lane, B e n s e n v i l l e . Illinois 6 0 1 0 6 , U S A

A

product

TRIO-KENWOOD

of

CORPORATION

Shionogi ShiDuya Building. 17-5. 2-chome Shibuya. Shibuya-ku. Tokyo 150. Japan

T R I O - K E N W O O D C A N A D A I N C . , 1 0 7 0 J a v s o n C o u r t M i s s i s s a u g a , O n t a r i o C a n a d a L 4 W 2V5
T R I O - K E N W O O D E L E C T R O N I C S , N.V. L e u v e n s e s t e e n w e g 504 B-1930 Z a v e n t e m , B e l g i u m
TRIO-KENWOOD ELECTRONICS G m b H
Rudolf-Braas-SIr 20. 6 0 5 6 H e u s e n s t a m m , W e s ! G e r m a n y
T R I O - K E N W O O D F R A N C E S.A. 5, B o u l e v a r d Ney, 75018 P a n s , F r a n c e
T R I O - K E N W O O D S V E N S K A A B . K e m i s t v a g e n 10A P O Box 6 8 , S-183 21 Taby. S w e d e n
T R I O - K E N W O O D A G Unlerboesch 6331 H u e n e n b e r g / Z U G Switzerland
T R I O - K E N W O O D ( A U S T R A L I A ) PTY. L T D . 3 0 W h i n n g St , A r t a r m d n , N S W 2 0 6 4 , A u s t r a l i a
K E N W O O D & LEE E L E C T R O N I C S , LTD.
W a n g K e e Building. 5 t h Floor, 34-37, C o n n a u g h t R o a d , C e n t r a l . H o n g K o n g

MF479 8101007SA Printed in Japan



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