KENWOOD

KT-IOOO
KT-900
KT-800

Sales Manual

PULSE COUNT DETECTOR

TUNER
Product policy
For over three decades, Kenwood has continually intro- the KT-1000 incorporating the latest in tuner technology, but
duced innovations in tuner design and engineering. The packaged without the frills to attract a wider market. A bit
name Kenwood has thus become universally recognized for under in terms of features and price range comes the KT-
excellence in tuner technology, and many satisfied users 900, but still offering the superb sound quality expected of
will testify that for them, the tuner is Kenwood. But there's a Kenwood. Finally, there's the totally new-style KT-800, an
whole lot more to tuners than the technology, these days. automatic computer-guided tuner that combines excellent
The average, non-audiophile also wants to be in on the high sound quality with unrivalled ease of operation. Here's a
quality FM and AM broadcast scene, even though the rundown of these three great new tuners, and the sales
budget is usually rather restricted. For such customers, points and facts to help you sell them.
Kenwood has the answer. At the top of this year's line-up is

New Pulse Count

Detector IC
Conventional FM detection circuits using an analog method verted into digital equivalents, any minor deviations or rip-
allow a lot of chances for noise or distortion to be intro- ples caused by noise or distortion are simply ignored — the
duced to the original FM signals. In order to faithfully result is a digital equivalent of the pure original FM signal,
preserve the original characteristics of the FM signals, free from distortion or noise and remarkably stable against
Kenwood has developed a new Pulse Count Detector IC, changes in temperature, humidity and age. When converted
which uses a digital method to detect the FM signals. Fol- back into an analog signal, the signal at output is exactly the
lowing is a simplified explanation of how it works. same as originally input. Any noise or distortion that might
The wave shapes of the individual FM signals are sampled have affected the signal during the detection process has
and the basic wave shape of each are converted into digital been completely eliminated. This system is utilized in the
equivalents in the form of pulses of equal width and ampli- KT-1000 and KT-900.
tude. Since only the basic shape of the signals are con-

Direct RF Conversion
When there are many powerful FM stations and other where the intermodulation products produced by the
sources competing for air space, extraneous signals are all interference of extraneous signals are attenuated rather
too easily picked up by the FM antenna and amplified, than amplified. Either Direct RF Conversion or normal con-
introducing a great deal of noise and distortion. To eliminate version can be selected by a switch, allowing the choice of
such interference, Kenwood has developed a Direct RF the method most suitable to the particular reception condi-
Conversion technique. This by-passes the RF amplifier tions. This system is utilized in the KT-1000.
stage, sending signals instead directly to the mixer stage,
Independent Power Supply
For Local Oscillator
One consequence of the relatively high impedance of problem by eliminating the source itself — the + B line to
power supplies is that leakage from the +B line of the the oscillator, giving the local oscillator its own independent
power supply unit can feed back to the local oscillator to power supply. With two power supplies, noise due to leak-
modulate the local oscillator frequency. This causes tuning age is virtually non-existent, even at 100% modulation. In
inaccuracies by deflecting the tuned frequency above and the KT-1000, this is perfectly utilized.
below its optimum level. Kenwood engineers solved this

High Quality AM Section

In the past, AM sections of FM/AM stereo tuners have AM sections that are as carefully designed as FM sections.
tended to be neglected because of the generally inferior In the KT-1000 an IF band selector is provided for the AM
quality of AM broadcasts. Now, Kenwood tuners are fully section.
able to reproduce the upgraded AM broadcast quality, with

Sample-And-Hold
MPX Circuit
As with the Pulse Count Detector, Kenwood engineers have caused by noise or distortion are ignored. This greatly
taken advantage of the exceptional accuracy of digital pro- reduces the need for filtering, which vastly improves chan-
cessing with the introduction of the Sample-and-Hold multi- nel separation, because filtering can obscure important
plex decoder. This circuit cleanly extracts the left and right information in the composite signal, interfering with the abili-
channel signals from the composite FM signal carried by ty to isolate left and right channel signals. The peak pulses
the 38 kHz subcarrier frequency. The wave peaks are con- are sampled then held in a capacitor until the next peak ar-
verted into digital equivalents in the form of pulses. Since rives; thus, the average peak value can be instantly adjusted
only the basic shape of the waves are converted into digital for precise representation of the original 38 kHz subcarrier.
equivalents, transient deflections in the shape of waves The KT-1000 employs this superior type of MPX decoder.

Quartz Synthesizer
Preset Tuning
Kenwood's quartz-PLL tuning circuit uses the ultra-stable desired station is manually tuned in, and then the preset
oscillating frequency of a quartz crystal to keep the fre- button is pressed, after which any one of eight station
quency generated by the local oscillator locked to the exact buttons may be pressed. Whenever that station is desired,
tuning frequency. The quartz-PLL circuit can be preset to pressing the station button previously selected will
automatically tune to any one of any combination of as automatically tune the station. This system is fully utilized in
many as eight different FM or AM stations. To preset, the the KT-800.
 Sales Points Key Specs
KT-1000 FM usable sensitivity: 23.3 dBf (8.0>V) in Direct
• Pulse Count FM Detector RF Conversion mode 10.3 dBf (1.8/A/) in normal
• Direct RF Conversion with Selector mode
• Dual-gate MOS-FET front-end with 5-gang tuning FM THD at 1 kHz: 0.03% (mono), 0.04% (stereo)
capacitor Alternate channel selectivity: 65 dB at 300 kHz
• Sample-and-Hold multiplex decoder (NARROW) 45 dB (WIDE)
• Independent local oscillator power supply Stereo separation at 1 kHz: 60 dB (WIDE), 50 dB
• Servo-lock tuning (NARROW)
• High quality design AM section Signal-to-noise ratio: 90 dB (mono), 85 dB (stereo)
• Narrow and Wide IF band selection for both FM Frequency response: 15 Hz to 15 kHz ±0.5 dB
and AM

KT-900 FM usable sensitivity: 10.8 dBf (1.9^V)

FM THD at 1 kHz: 0.03% (mono), 0.04% (stereo)
• Pulse Count FM Detector Alternate channel selectivity: 65 dB at 300 kHz
• Dual-gate MOS-FET front-end with 4-gang tuning (NARROW) 45 dB (WIDE)
capacitor Stereo separation at 1 kHz: 55 dB (WIDE), 47 dB
• Servo-lock tuning (NARROW)
• High quality design AM section Signal-to-noise ratio: 88 dB (mono), 83 dB (stereo)
• Dual-color signal strength and fine-tuning LED Frequency response: 30 Hz to 15 kHz +0.2 dB,
indicators -0.8 dB
• Digital frequency display
• Clean reception filter
• Narrow and Wide IF band selection for FM

KT-800 • FM usable sensitivity: 10.8 dBf (1.9/iV)

New, clean panel with store-away control pocket • FM THD at 1 kHz: 0.07% (mono), 0.09% (stereo)
Quartz synthesizer tuning • Alternate channel selectivity: 60 dB
8-station FM/AM preset memory bank with illumi- • Stereo separation at 1 kHz: 50 dB
nated indicator panels • Signal-to-noise ratio: 74 dB (mono), 71 dB (stereo)
Preset automatic selection of up to 8 FM or AM • Frequency response: 30 Hz to 15 kHz +0.2 dB,
stations -2dB
FM/AM preset station random access
2-ganged AM tuning capacitor for high AM recep-
tion quality
Operational convenience and flexibility
Switchable digital display of frequency or time as
needed
New signal strength and fine-tune display
Automatic stereo muting
Operating Features
O Power switch O LOCK/AUTO BLEND/MUTING switch. setting.
©FM REC CAL switch. Built-in tone Activates servo-lock system simultane- © FM/AM selector
oscillator helps achieve accurate rec- ously with automatic muting for weak sta- © Signal strength meter
ord level settings on tape deck. tions to maintain minimum acceptable ©Tuning meter
©FM/AM IF BAND selector. With Wide noise level. Indicator for "Muting On" © STEREO indicator
and Narrow band settings. Wide-band ©FM RF selector. Direct or Normal RF ©SERVO-LOCK indicator. Shows lock
indicator. conversion, with indicator for Normal tuned status after hand is released from
tuning knob.
© Touch-sensor tuning knob.
May be deactivated for normal
tuning.

© POWER switch © IF BAND WIDE and NARROW selector © Digital frequency display.
©LED mode indicators. Stereo, Narrow © LOCK switch. Selects between servo- ©Tuning direction indicator. Red indi-
IF band, servo-lock, AM, FM. lock tuning and normal fine-tuning. cates off-tuned status, green indicates
©AUTO/MUT and MONO mode selec- ©REC CAL selector. Oscillator tone precise tuning point.
tor. Auto-muting automatically main- establishes reference for correct tape ©Signal-strength display. Shows rela-
tains acceptable minimum noise level recording levels. tive strength of tuned signal.
for weak stations. © FM/AM selector ©Touch-sensor tuning knob.
May be deactivated for normal
tuning.

©TUNER OFF/ON switch. Selects be ©CLOCK ADJUST button. Used to- To activate automatic muting mode to
tween tuner operation or digital clock gether with nearby Hours and Minutes maintain acceptable minimum noise
only. Power is supplied constantly to buttons to set correct time. threshold at all times in both FM and AM.
digital clock. ©TUNING buttons. To tune automatically © FM/AM selector
© DISPLAY switch. Selects between dis- up or down the frequency bands. These ©PRESET control button. Preliminary
play of frequency being tuned in and time. buttons double as clock-adjustors. switch to activate preset station mem-
© MUTING selector with LED indicator. ory for storage.
© 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 ran-
dom access to preset FM and AM
are used with Preset control
button for memory storage.

o © © © ©©©
Specifications
FM TUNER SECTION
KT-1000 KT-900 KT-800
NORMAL DIRECT
Usable Sensitivity 10 3dBf(1 8MV) 23 3dBf(8 0^V) . 10.8dB*(1.9pV) 10.8dBf (1.9f/V)
50dB Quieting Sensitivity
(Mono) 16 4dBf(3 6^V) 29 3dBf(16/jV) . 16.4dBf (3.6JJV) 16.4dBf (3.6fjV)
(Stereo) 37 3 r i R f (4U,JV1 4 9firiRfdfifiuW . 37.3dBf (40f/V) 38.4dBf (46 V) M

Signal to Noise Ratio

(Mono) 90dB . 88dB 74dB
(Stereo) 85dB . 83dB 71dB
Total Harmonic Distortion WIDE NARROW WIDE NARROW
Mono 100Hz 0 03% 0.04% . 0.03% 0.04% 0.07%
1 000Hz 0 03% 0 15% . 0.03% 0.15% 0.07%
6 000Hz 0 05% 03 % . 0.05% 0.4 % 0.11 %
15 000Hz 0 04% 0.07% 0.05% 0.07%
50 — 10 000Hz 0 08% 0.3% . 0.09% 0.4 % 0.12%
Stereo 100Hz 0 04% 03 % . 0.05% 0.3 % 0.15%
1 000Hz 0 04% 03 % . 0.04% 0.3 % 0.09%
6,000Hz 0 06% 0.3 % . 0.07% 0.3 % 0.14%
15 000Hz 04 % 1.0 % 0.5 % 1.0 %
50 —10 000Hz 0 12% 0.6 % . 0.18% 0.6 % 0.4 %
Capture Ratio 0 8dB 2 OdB . 1.0dB 2.0a B 1.5dB
Alternate Channel Selectivity 45dB 65dB (300kHz) . 45dB 65dB (300kHz) 60dB
Stereo Separation
1 000Hz 60dB 50dB . 55dB • 47dB 50dB
50 — 10 000Hz 47dB 35dB . 45dB 35dB 40dB
15 000Hz 40rlR . 37dB 36dB
Frequency Response 15H7to15.0n0H7+0.5riB 30Hz to 15,000Hz + 0.2dB, -0.8dB .. . 30Hz to 15,000Hz + 0.2dB, -2dB
Spurious Response Ratio 120dB . 120dB 110dB
Image Response Ratio 90dB . 90dB 80dB
IF Response Ratio 110dB . 100dB 90dB
AM Suppression Ratio 70dB . 70dB 60dB
Subcarrier Product Ratio 73riR 68dB
Antenna Impedance 75 ohms unbalanced . 300 ohms balanced 300 ohms balanced
& 75 ohms unbalanced & 75 ohms unbalanced
FM Frequency Range 88MHzto 108MHz . 88MHzt0 108MHz 88MHz to 108MHz
Output Level Fixed 0 75V 2 2k ohms . 0.75V, 1.8k ohms 0.75V, 5.6k ohms
1,000Hz 100% Modulation Variable Oto 1.5V, 2.2kohms

AM TUNER SECTION
10HV .. . . <3.,V 18 V
Usable Sensitivity M

Signal to Noise Ratio 52dB . 52dB 50dB

Total Harmonic Distortion 0 2% . 0.4%
Image Rejection 7f)riR . 45dB 40dB
Selectivity 30dB (WIDE), 50dB (NARROW) . 58dB 50dB
Output Level Fixed 0.25V, 2.2k ohms . 0.15V, 2k ohms 0.25V, 5.6k ohms
400Hz30% Modulation Variable Oto0.5V, 2.2k ohms

GENERAL
Power Requirements fif1H7 1?0V . 60Hz120V 60Hz 120V
(U S A & Canada Model) . (U.S.A. & Canada Model) (U.S.A. & Canada Model)
or 50/60Hz 110 — 120/220 — 240V.. . or50/60HZ110 — 120/220 —240V.. . or 50/60Hz 110 — 120/220 — 240V
switrhahlp . switchable switchable
Power Consumption 0 1HA . 0.25A 0.1A
Dimensions (W* Hx D) 440* 123x388mm . 440x78x 390mm 440x52x247mm
(17-5/16" x 4-27/32" x 15-9/32") . (17-5/16"X3-1/16"X15-11/32") (17-5/16"x 2-1 /32" x 9-23/32 )
Weight (Net) 6.5kg (14.3lbs) . 5.1kg (11.2lbs) 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.

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