Computer-Controlled
Digital Synthesizer Tuner
The primary
function of a tuner is bring in the station you want precisely and accurately,
whether it's near or far. Using the latest circuit designs and device, we've
made our tuner from the Super Digifine series, the FX-1010TN, more sensitive,
selective and interference resistant than ever - the reason the tuner is able
to provide wide dynamic range, low noise and low distortion, and wide frequency
response. It's also extremely easy to use, thanks to the amazing power of an
advanced microprocessor.
Reception
servo for optimum reception from any station, almost anywhere. A built-in
microprocessor detects the strength of a tuned station and compares it against
the degree of interference from adjacent stations. Then, depending on the
degree of interference, the microprocessor selects the optimum operation mode
for front-end. IF and multiplex decoder stages (adjusting such parametersas RF
gain, IF bandwidth, Quieting Slope Control and mono/stereo). Therefore when
interference is excessive, a narrow IF bandwidth is automatically chosen to
prevent noise. And if there's no interference, then a wide IF bandwidth is
automatically selected to give you remarkably clear sound. When a signal level
is overly strong, the RF gain is reduced to avoid saturation distortion; when
it's weak, sensitivity is increased. Moreover, the tuner is equipped with
inpuls to connect two antennas; each may be oriented for the best reception of
stations in diametrical opposition to the other .
Conveninlly,
the position of antennas, A or B, may be stored in memory station by station,
which allows most precise reception from any station, without multipath
distortion.
To add to
convenience, the selected parameters are clearly indicated on a large
fluorescent display, letting you quickly confirm tuning status.
Features for
low noise and low distortion
JVC uses
components and devices to ensure lowest possible noise and distortion and
widest dynamic range from your favorite stations.
"Opticalink"
System
This system
is one developed by JVC to ensure highest purity from your favorite station. It
uses eleven photocouplers (each consisting of a photoemitter and photosensor)
to electrically decouple the analog from the digital section. As a result,
interference between the two due to electric coupling is completely eliminated.
This puts an end to digital noise and removes any trace of muddiness from the
sound you hear.
In the
FX-1010TN, each of the analog/tuner, digital control and "Opticalink"
sections is mounted on its own PC board to shut outmutual interference and
noise. And the digital control section, which can be a source of noise
generation, is fully shielded to contain noise.
MOS FET
front-end
The front
end employs a dual-gate MOS FET which, along with high-Q varicaps, makes it as
sensitive, selective and resistand to interference as a front end using an
elaborate 5-ganged tuning capacitor. Therefore, the Signal-to-Noise ratio and
interference rejection capability are outstanding.
Low-distortion
IF section
The IF
section of the FX-1010TN features ceramic filters coupled with a distortion
reduction circuit for better phase response and low distortion
PLL detector
and Beatless PLL multiplex circuit.
A PLL
detector combines low distortion and high Signal-to-Noise ratio for dynamic and
wide-range sound. Also the FX-1010TN uses a new PLL multiplex circuit that
electrically filteres out beat noise-noise resulting from two or more
frequencies interfering with one another. In a conventional CR-type MPX circuit
using a VCO (Voltage Controlled Oscillator), however, a device called an
"anti-birdie filter" is used to remove beat noise, but the coils in
the circuit tend to degrade signal qulaity. In our beatless multiplex circuit,
moreover, a pilot canceller is featured to suppress the leakage of the pilot
signal, thus obviating the need for a 19 kHz filter, another component that
would harm sound quality.
Active
Filter
To prevent
leakage of the 38 kHz subcarrier contained in a stereo broadcast, an LC filter
built from coils and capacitors is commonly used, but, due to the magnetic
distortion the core of the coil causes, this system tends to degrade sound
quality in the FX-1010TN, however, an active filter; with coil eliminated, it
provides better high-frequency response, wider separation and higher
Signal-to-Noise ratio.
Computer-controlled
operating ease.
With the
help of powerful microcomputers, we've also improved tuning ease of the
FX-1010TN tremendously.
Station name
display
You can
assign up to six alphanumeric characters to each preset station in the memory -
"JAZZ-B", for instance.
Auto memory
All 40 FM/AM
stations can be automatically tuned in sequence and committed to memory as
presets.
Random
preset memory
You can
preset as many as 40 FM/AM stations in random oredr. There's numeric keypad
that allows direct access to any of 40 stations.
Preset scan
All preset
FM/AM stations can be automatically sampled one by one for approximately 5
seconds each
Preset
cancel
Use this
feature to skip undesired preset stations during preset scan
Program
memory
Up to eight
"events" (broadcasts) can be programmed for sequential recall under
the control of an optional timer.
Auto QSC
The Auto
Quieting Slope Control circuit automatically goes into action to reduce noise
when a station signal is weak.
dB-referenced
signal strength indicator
Read off the
signal strength of a tuned station accurately down to 1 dB - a convenience when
orienting antennas.
Variable
stop level
Adjust FM/AM
muting threshold in 5 dB steps over a range during auto tuning. The variable
stop level feature lets you adjust the threshold from 20 dB to 60 dB for FM,
and from 60 dB to 90 dB for AM. When you use a higher level, you'll receive
only powerful, clear-sounding stations, with weak stations muted out. Or, when
you choose a low level, all receivable stations are tuned in.
Record
calibration signal generator
Record
calibration signal generator outputs a standard 400 Hz signal for recording
level adjustment.so, you can easily set the recording level for different
broadcasts or types of tape.
Specifications:
FM Tuner
Section (IHF)
Usable
Sensitivity: 10,3 dBf (0,9 µV/75 Ω)
50 dB
Quieting Sensitivity:
Mono : 14,8 dBf (15 µV/75 Ω)
Stereo
: 38,1 dBf (22 µV/75 Ω)
Signal-to-Noise
Ratio (IHF-A Weighted)
Mono /
Stereo (aat 85 dBf) : 94 dB / 88 dB
Total
Harmonic Distortion (1 kHz):
Mono /
Stereo : 0,009% / 0,02% (WIDE)
Capture
Ratio: 1,2 dB
Selectivity
(400 kHz): 25 dB (Wide); 75 (Narrow)
IF Response
Ratio: 110 dB
AM
Suppression Ratio: 65 dB
Stereo
Separation (1 kHz): 60 dB (Wide)
Frequency
Response: 20 Hz - 15 kHz (+0,3 -0,5 dB)
Antenna
Input Impedance: 75 Ω unbalanced x 2
Output
Signal Level: 600 mV (2,2 k ohms)
Rec Cal
Output Level: equivalent to 50 % FM
modulation
AM Tuner
Section
Usable
Sensitivity : 250 µV /m (loop antenna)
Total
Harmonic Distortion: 0,3%
Signal-to-Noise
Ratio: 50 dB
Selectivity
(±10 kHz): 35 dB
Image
Response ratio: 40 dB
IF Response
Ratio: 60 dB
Dimensions
(W xH x D): 435 x 100 x 298 mm
(17-3/16" x 3-15/16" x 11-3/4")
Weight: 3,7 kg (8,2 lbs)
