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SYNTHESIZER AM-FM TUNER
O DGL FM detector 0 Synchronous AM detector
0 AM-FM 14-station random memory
The Accuphase T-106 symbolizes the best of Accuphase’s tuner technolog
newly developed DGL detector of high stability and low distortion in the ]
detector of excellent interference rejection capability in the AM section.
In line with technological progress, electronic tuning systems are
beginning to dominate the market. outmoding conventional models
with variable rotating capacitors. Of special importance are their
higher tuning accuracy, by use of a memory to select stations. and
strong resistance to vibration.
The Accuphase T-106 is a sophisticated quartz-locked synthesizer
AM-FM stereo tuner. The FM section achieves superb fidelity and
stability through the most advanced electronic tuning circuitry on the
market: a differential gain linear (DGL) detector using the delay time
of C-MOS le as its operating principle and other new materials and
The AM section has a synchronous detector and the ability to
eliminate powerful interference. Moreover. it is hardly affected by
In addition to its easy operation and distinctive design, the T-106
also boasts stable performance and high reliability supported by the
most up-to-date Accuphase technology Sit back. relax. and enjoy.
music as you like it with the T-106.
1 ELECTRONIC TUNING SYSTEM REALIZES HIGH TUNING
The highly accurate electronic tuning system in the T-106 receives desired
signals with a quartz-controlled precision of 100027;. Furthermore. almost no
microphonics or noises are caused by acoustic feedback. The tuned
frequency channels can therefore be locked with minimum distortion at the
point of highest sensitivity. and the frequency will hardly deviate in spite of
time and temperature changes.
2 14-STATION RANDOM MEMORY AND PULSE TUNING
The dual use of 7 feather-touch pushbuttons permit random presetting of up to
a total of 14 FM and AM stations. which can be recalled whenever desired.
The pushbutton number and frequency of a recalled station are displayed by
digital indicators on the front panel. In addition. the T-106 provides “Manual
Tuning" which preserves the “feel" of turning a variable capacitor knob. This is
the result of employing a newly developed optical pulse generator that is
inserted within the tuning knob. whose output is used to control the
synthesizer. and change its tuned frequencies. FM broadcast station selection
can be continuously carried out in steps of 50 kHz, or 100 kHz in North
America and non-European countries. AM in steps of 9 kHz. or 10 kHz in North
America and South America. A pip sounds at these intervals.
Fig. 1 Prlnclple of DGL Detector
Meter Drive Circuit ll
, ; ’5,
Audlo Signal I
Amplification Clrcult ,
le for Function Selection @—
S DOUBLE-TUNED FRONT-END REJECTS
INTERFERENCE AND INTERMODULATION
The front-end is virtually the “heart" of any tuner. It selects the input signal.
amplifies it and generates and delivers the intermediate frequency signal of
10.7 MHz to the detector, The design of this section determines its sensitivity
and interference reiection capabilities. as well as the quality of that tuner. A
great improvement in suppressing RF intermodulation. which is of great
imponance. was achieved in the T-106's tron-end by using a genuine
electronic control system utilizing Varactor diodes that work together With PLL
circuitry. in addition to two stages of double-tuned RF circuitry and a tuned
NEWLY DEVELOPED DIFFERENTIAL GAIN LINEAR FM
DETECTOR AND IF FILTERS WITH FLAT GROUP
The T-106 realizes stable characteristics with minimum distortion and
excellent capture ratio through its combination of the newly developed DGL
(differential gain linear) detector and specially selected intermediate frequen-
cy litters with flat group delay time characteristics.
The DGL detector incorporates
19 serially connected high~speed
C-MOS ICs, as shown in Fig. 1.
The phase angle is delayed by
114“ to minimize distortion and to
obtain the best signal-to-noise
ratio. The delay signal that results
and the Input signal are applied to
an exclusive OR circuit. m VG c
The ate circuit is then closed ’ ‘ ""- ."
(with 1?. 00) or opened (with 10, human“
01). according to the electric potential between the two signals. The
compression ratio of signals produced by modulation is thus detected digitally
(i.e., logical multiplication is performed). and sound signals are obtained (Fig,
2). Because the linear range of the delay circuit is extremely wide (iSMHz)
and the circuit requires no adjustment. stable and high-grade linear
differential gain characteristics can be obtained. Should the radio interference
be strong, the NARROW IF filter can be selected by switching operation on the
front panel, thus allowing reception with emphasis on the selectivity.
5 NEWEST STEREO DEMODULATOR
The FM stereo demodulator, which integrates the newest technology
available. realizes near-perlect performance characteristics. shown here in
Stereo separation : GBdB (1kHz)
Total harmonic distortion : 0.004% (tkHz MONO)
0.01% (1kHz STEREO)
Signal-to-noise (S/N) ratio . 97dB
Subcarrier product ratio : BZdB
When reception is unclear because of a weak input signal. (20dBf or less). the
monophonic mode is automatically selected to clear it up.