|
| Accuphase T-105 |
|
| 120,000 yen(October, 1980 release) |
The Quartz lock synthesizer FM tuner which made full use of microprocessor
technology.
Bureau synthesizer-election in crystal oscillator circuit is standard frequency
to create the necessary program divider receive a preset frequency PLL
circuit and the combination of a front-end electronically tuned to the
desired signal.
It is possible for
received frequency not to change continuously like the conventional variable
condenser system, to lock received frequency correctly at intervals of 100kHz, and to always receive in the distorted minimum point.
In order to also
enable manual type tuning of the same feeling as a variable condenser system,
the pulse tuning system developed by T-104 is carried. This system has the
structure of generating a pulse signal, controlling a synthesizer now and
changing received frequency with the optical pulse generator attached to the
core of a rotating knob.
Moreover, it is possible to make it memorize
beforehand in the office of choice, to carry the memory tuning system called by
one-touch, and to carry out the memory of the six games.
Furthermore, the scanning system to which the sweep of the received frequency
is carried out quickly is also carried.
The pure electronic control system which used
for the front end part the Barak Tarr element combined with the PLL circuit is
adopted, and RF inter-modulation is sharply improved by composition of a
two-step double alignment system and an alignment buffer.
In order to
reconcile the high selection degree characteristic and a low distortion in an
intermediate frequency circuit, the bulk wave filter which was excellent in the
degree of selection and delay characteristics is adopted.
Moreover, the selectivity changeover switch from which interference of
an adjoining office is removed is carried, and the degree of high selection
and coexistence of the low distortion are aimed at with the exclusive bulk
wave filter also at the time of Narrow (the degree of high selection).
The "phase conversion type wave
detector" which multiplies by the signal and input wave using the phase
converter (circuit which carries out deflection of the phase) which changes
linearly according to frequency focusing on 90 degrees, and acquires an audio
signal is used for a wave detector. The outstanding detection characteristic has
been acquired by this broadband linear phase phase converter.
The PLL
Demodulator which contained the circuit which removes a pilot career is carried
in the stereo recovery circuit.
The check of meter of an incoming signal
level, a peak directions degree of modulation, and a multipass increases d
systems with a changeover switch.
If an incoming signal level goes into a
dBf Direct-reading scale, a degree of modulation enters to full-scale 200% and, as for a multipass, a meter guide goes into the range of a clear mark, a good
electric wave is receivable by the multipass minimum.
The noise filter
which reduces the noise of the weak stereo office of an electric wave, the mode
switch which changes a stereophonic broadcast to a monophonic recording, the
muting switch which removes the noise between offices, the output level control,
etc. are carried.
There was a natural rosewood cabinet as an option.
|
| Form |
Synthesizer FM tuner |
| <Monophonic characteristic>
|
| Practical speed |
11.2dBf (2.0 microvolts) |
| S/N 50dB sensitivity |
17.3dBf (4.0 microvolts) |
| Standing-wave ratio |
1.5 |
| S/N ratio |
80dB (65dBf (1mV) input) |
THD
(at the time of 65dBf (1mV) input,
±75kHz deflection, and Normal) |
100Hz:0.04%
1kHz:0.04%
6kHz:0.08%
10kHz:0.04% |
| IM distortion (14kHz:15kHz=1:1) |
0.01% (65dBf (1mV) input, ±75kHz deflection)
|
| Frequency response |
10Hz-16kHz+0 -0.5 dB |
| The degree of 2 signal selection (45dBf
(100-microvolt input)) |
| Disturbance wave |
Normal |
Narrow |
| 400kHz |
60dB |
100dB |
| 200kHz |
8dB |
22dB
|
|
| Capture ratio |
1.5dB |
| RF inter-modulation |
80dB |
| Spurious disturbance ratio |
120dB |
| Image ratio |
120dB |
| AM oppression ratio (65dBf (1mV) input)
|
80dB |
| Subcarrier oppression ratio |
70dB |
| SCA disturbance ratio |
80dB |
| Output voltage (±75kHz deflection)
|
1.0V |
| <Stereo characteristic>
|
| Sensitivity |
S/N 40dB: 28.8dBf (15 microvolts)
S/N
50dB: 37.3dBf (40 microvolts) |
| S/N (65dBf (1mV) input) |
75dB |
THD
(at the time of 65dBf (1mV) input,
±75kHz deflection, and Normal) |
100Hz:0.04%
1kHz:0.04%
6kHz:0.08%
10kHz:0.08% |
| IM distortion (9kHz:10kHz=1:1) |
0.03% (65dBf (1mV) input, ±75kHz deflection)
|
| Frequency response |
10Hz-16kHz+0 -0.5 dB |
| Stereo separation |
100Hz:50dB
1kHz:50dB
10kHz:45dB
|
| Stereo change inlet pressure |
19.2dBf (5.0 microvolts) |
| <Synthesis> |
| Received frequency |
76.1MHz - 89.9MHz |
| Antenna |
75-ohm disequilibrium |
| Alignment system |
Quartz lock frequency synthesizer system
Manual: Pulse tuning
Memory: Six games |
| Frequency accuracy |
±0.002% |
| Output load impedance |
Fixed output: 200ohms
Variable output:
1.25kohm (maximum) |
| Meter |
Signal strength / multipass / modulation
change type |
| The semiconductor used |
Transistor: 26 pieces
FET: Three pieces
IC: 24 pieces
Diode: 73 pieces
Optocoupler: Two pieces
|
| Power source |
AC100V, 50Hz/60Hz |
| Power consumption |
25W |
| Dimensions |
the width 445x height 128(piece -- it
includeds) x depth of 370mm |
| Weight |
8.4kg |
| Option |
Wood cabinet A-9 (16,000yen) |
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