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| Accuphase T-109 |
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| 150,000 yen(December, 1993 release) |
FM stereo tuner which aimed at the ultimate grade as a tuner for the music fan
who asks for the highest sound quality.
The alignment for tuning can
align with the office of choice with high precision with a crystal oscillator,
most gaps by time or a temperature change cannot be found, and it locks at the
point of the distorted minimum and sensitivity highest.
Moreover, the abnormal-conditions distortion or noise by external vibration are not made for
electronic tuning.
Before amplifying in a front end in an antenna
circuit, the antenna double tuning circuit which lets a selection circuit pass
is adopted as it, and the intermodulation generated by amplifying directly at
the time of the Dainyuu power is prevented.
FET of cascode amplifier
(circuit which connected two amplifiers to cascade and improved frequency
response) composition with little feedback is adopted as high frequency
magnification. The Attenuator by a PIN diode is prepared in the gate of this
input, this Attenuator is turned on and off with a microcomputer with an antenna
input level, and the excess Dainyuu power in the area where a transmitting tower
is near is coped with.
Moreover, the balanced mixer circuit by push pull FET
was adopted as the mixer, generating of higher-harmonic-wave distortion was
suppressed in it, and the disturbance signal is eliminated in it.
The Advanced DGL detection circuit which added an extensive improvement
for the DGL (Fifferential Gain Linear) circuit which is not adjusted [
high performance, quantity reliability, and ] to the base is newly carried.
In the input unit of this circuit, beat disturbance is made for there to
be nothing at a 2.4MHz broadband amplifier using the high-speed comparator.
Moreover, stability is raised to the delay circuit using 24 high speed
C-MOS IC.
The principle of
operation has the composition that the delay circuit delayed the degree of phase angle 114 degrees so that the distorted minimum and the signal to noise ratio
might become the maximum by 24 ICs paying attention to the delay time of the
output of a high-speed logic IC. This delay signal and incoming signal are applied to an exclusive OR circuit, the electric potential between two signals
is chosen, and a circuit is opened and closed. The compression wave produced by
abnormal conditions at this time was detected in digital one, and the audio
signal is taken out.
This system has a linear region of a delay circuit as
large as ±2.4MHz, and, moreover, the differentiation profit straight line
characteristic of it having been stable and having excelled can be acquired for
no adjusting.
IF stage has adopted the two-step change of Normal and
Narrow.
Usually, the sharp reception focused on a selection degree is
possible by using NORMAL of broadband reception, and changing to NARROW, when
interference with an adjoining broadcasting station is intense.
In the
stereo recovery part, the internal oscillating circuit was locked by the PLL
circuit (fixation), and the exact 38kHz switching signal has been acquired.
In T-109, the system which combined the positive/negative variable reactive
circuit controllable on control voltage with the ceramic resonance child is
adopted as the internal oscillating circuit of this PLL. Thereby, an exact
switching signal is acquired in the lock frequency range narrower than before.
In this circuit, since the lock frequency range which does not almost have
change of the separation rate by adjust[ no ]-izing of a stereo recovery circuit
and reservation of long-term stability, change of a temperature change and line
voltage, etc. is narrow, there are the features, like there is little beat
disturbance in high frequency.
If a 16-game memory is carried and the
memory is carried out beforehand, it can call with a button in an instant.
Moreover, in accordance with a situation, the memory of each functions, such
as Selectivity, Meter, Filter, Muting, and Mono, can be carried out according to
an electric wave state.
The microcomputer of Accuphase original is used for these functions, and the clock frequency has taken the bowl clock system which carries out a divide from the PLL frequency of an electronic tuning circuit, and is suppressing beat disturbance.
Besides memory tuning, the manual alignment machine by
the rotating knob of a pulse tuning system is carried.
The disc which was
attached to the shaft of a rotating knob and in which the slit was cut radiately
generates a pulse by passing a phase detector (non-contact [ by light ]), and
this has structure which inputs this pulse into a microcomputer and controls the alignment frequency of PLL.
Rotation of a knob will tell change of frequency
by generating of a beep sound.
The balance circuit is carried in the audio output, the noise ingredient of a signal cable or an earth line is
eliminated, and noise-free high-quality sound transmission is possible.
The check of an antenna incoming signal level and a multipass is
possible for meter by a changeover switch.
a multipass is peculiar to an FM
broadcast and is generated by a multiple reflection wave (ghost) -- it is
distorted. Since this can be prevented by direction of an antenna, it chooses a
broadcasting station so that a multipass may become the minimum in meter, or
adjusts the direction of an antenna.
The antenna incoming signal can check
the intensity of an electric wave depending on how depending on which meter
sways, and the signal to noise ratio becomes good, so that the deflection of a
needle is large.
The muting switch which removes the noise filter which
reduces the noise of the weak stereo office of an electric wave as an attached
function, and the noise between offices, the mono-switch compulsorily used as a
monophonic recording, and the output level control are carried.
Tuning
and various functions are controllable with an attached remote commander.
|
.JPG) |
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| Form |
FM stereo tuner |
| <Monophonic characteristic>
|
| Received frequency |
76.0MHz - 90.0MHz |
| Practical speed |
11dBf(IHF) |
| S/N 50dB sensitivity |
17dBf(IHF) |
| Standing-wave ratio |
1.5 |
| S/N (80dBf input, A compensation)
|
90dB |
THD
(at the time of 80dBf input, ±75kHz
deflection, and Normal) |
20Hz:0.02%
1kHz:0.02%
10kHz:0.02%
|
| IM distortion (80dBf input, ±75kHz
deflection) |
0.01% |
| Frequency response |
10Hz-16000Hz+0 -1.0 dB |
| The degree (IHF) of 2 signal selection
|
| Disturbance wave |
Normal |
Narrow |
| 400kHz |
70dB |
100dB or more |
| 300kHz |
30dB |
100dB |
| 200kHz |
10dB |
40dB
|
|
| Capture ratio |
1.5dB |
| RF inter-modulation |
80dB |
| Spurious disturbance ratio |
120dB |
| Image ratio |
100dB |
| AM oppression ratio (65dBf input)
|
80dB |
| Subcarrier oppression ratio |
70dB |
| SCA disturbance ratio |
80dB |
| Output voltage (±75kHz deflection)
|
1.0V |
| <Stereo characteristic>
|
| Sensitivity |
S/N 40dB sensitivity: 29dBf (IHF)
S/N
50dB sensitivity: 37dBf (IHF) |
| S/N (80dBf input, A compensation)
|
85dB |
THD
(at the time of 80dBf input, ±75kHz
deflection, and Normal) |
20Hz:0.04%
1kHz:0.04%
10kHz:0.04%
|
| IM distortion (80dBf input, ±75kHz
deflection) |
0.03% |
| Frequency response |
10Hz-16000Hz+0 -1.0 dB |
| Stereo separation |
100Hz:50dB
1kHz:50dB
10kHz:40dB
|
| Stereo change inlet pressure |
20dBf |
| <Synthesis> |
| Antenna |
75-ohm disequilibrium |
| Alignment system |
Quartz synthesizer system
16-game random
memory tuning |
| Detection system |
Advanced DGL system |
| Output load impedance |
| Balanced (balanced XLR type) : |
200ohms (100ohm/100ohm)
|
| Unbalanced (disequilibrium) |
Fixed (fixed output): 200ohms
Controlled(variable output): 1.25kohm (maximum)
|
|
| Meter |
Signal strength, a multipass change type
|
| Power supply voltage |
AC100V, 50Hz/60Hz |
| Power consumption |
15W |
| The maximum Dimensions |
Width 475x height 140x depth of 402mm
|
| Weight |
9.5kg |
| Attachment: Remote commander RC-12
|
| Remote control system |
Infrared pulse system |
| Power source |
DC3V |
| Battery |
SUM-3 type (IEC name R6) two-piece use
|
| The maximum Dimensions |
64mm[ in width ] x height 149x depth of 18mm
|
| Weight |
145g (battery included) |
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