Accuphase FM tuner Accuphase T-1200 DDS FM stereo tuner T-1200

Description

Accuphase
FM tuner
Accuphase
T-1200
★DDS FM stereo tuner "T-1200"
The "T-1200" is the highest-class FM stereo tuner that is a full model change of the T-1100.
It was born by actively promoting the digitization of major components, such as the fusion of analog high-frequency technology cultivated over many years and advanced digital technology, and the adoption of high-speed operation type DSP.
The "T-1200" is a product that allows you to rediscover the charm of FM broadcasting, and is the culmination of the AccuPhase that has continued to develop FM tuners since its foundation.
◆ "Two-stage double-tuned front end" with thorough measures against large input interference
In the front end of the FM tuner, only the desired station is selected from a large number of radio waves entered from the antenna, amplified by the RF amplifier, and then mixed with the high frequency signal and the signal of the local oscillator (Local Oscillator), and the intermediate frequency ) Is converted to. It is natural to select weak radio waves as the role of the front end, but it is also important not to cause interference or distortion for broadcasting stations with strong electric field strength, which is an absolute condition for high-quality reception.
The front end of this unit uses the LOCAL button on the front panel to switch the attenuator for the signal that first enters from the antenna according to the input level, and cope with excessive input when the area near the transmission tower or when using cable broadcasting.
This unit has a two-stage configuration in which a double-tuned circuit is installed before and after the high-frequency amplifier, and it has improved the interference wave elimination capability of the input to the mixer at the next stage, ensuring even better sensitivity and selectivity. The double-tuned circuit uses M (mutual induction) coupling. The high-frequency amplifier is equipped with a "dual gate MOS FET" with excellent third-order intermodulation product characteristics, and AGC (Automatic Gain Control) is applied to operate it to obtain the best gain depending on the antenna input level. I will.
◆ Achieving an astonishing high SN ratio by incorporating the revolutionary DDS (Direct Digital Synthesis) in the local oscillator
This unit is equipped with a revolutionary DDS (Direct Digital Synthesis) as a local oscillator. Since the DDS does not use feedback, it can generate an output signal with exactly the same frequency purity as a crystal oscillator circuit. Therefore, by using DDS, it is possible to realize a super heterodyne front end with a surprisingly high SN ratio without injecting unnecessary frequency modulation components into the received signal.
The original clock of 196.608MHz is used for the oscillator circuit of the master clock of DDS, and it is contributing to the achievement of a high SN ratio. In addition, the output section achieved a remarkable spurious suppression by outputting a high-precision and low-distortion sine wave from the 786.432MHz/14bit D/A converter.
◆Full digitalization of intermediate frequency (IF) circuit and later
The intermediate frequency (IF) signal from the front end is digitized by the A/D converter, and the high speed and high precision DSP (Digital Signal Processor) is adopted from the <> to <>. We were able to dramatically improve full digital processing and performance/characteristics.
In addition, the excellent <> can significantly suppress the influence of interference waves due to reflections from buildings and mountains, resulting in high-quality demodulation and high-quality sound with less distortion and noise. Enabled voice output.
◆ Supports reception of FM complement relay station (wide FM)
◆ Accuphase Original pulse tuning method allows traditional manual tuning
◆It is equipped with "MDS conversion method D/A converter"
◆ Equipped with "Direct Balanced Filter circuit" for analog filters
◆Analog output is equipped with two lines, line/balance, and equipped with a polarity switch at the balance output terminal.
Equipped with high-quality digital output terminal (1 coaxial system)
◆20 stations that store each function together
◆ Equipped with various functions
-Equipped with a meter to monitor the radio wave status (display of "SIGNAL" indicating the strength of received radio waves and "MULTIPATH" indicating the size of multipath)
-Multi-path reduction circuit (suppresses interference due to multi-path)
-Muting circuit (when tuning with the tuning knob, it does not produce annoying noise in stations where the radio waves are weak and good reception is not possible)
-Mode switching (STEREO/BLEND/MONO)
-Attenuator function to attenuate antenna input (LOCAL OFF/LOCAL ON)
-An electronic sound when operating a function (a beeping sound that can be heard in a quiet room)
-A remote commander "RC-430" that controls various functions is attached (volume control of the connected Accuphase amplifier is possible)
It's a sequel.
■Specification■
Reception frequency: 76.0-95.0MHz
[When receiving stereo]
Sensitivity: SN ratio 40dB sensitivity/18dBμV, SN ratio 50dB sensitivity/30dBμV
SN ratio (85dBμV, A correction): 76dB
Total harmonic distortion (85dBμV, ±75kHz deviation): 20Hz/0.04%, 1kHz/0.04%, 10kHz/0.04%
Frequency characteristics: 10 to 15,000Hz (+0, -2.0dB)
Stereo separation: 100Hz/65dB, 1kHz/65dB, 10kHz/50dB
Stereo switching input sensitivity: 9dBμV
Subcarrier suppression ratio: 70 dB
[General specifications]
Antenna input: Coaxial 75Ω (F type terminal)
Standing wave ratio: 1.5
Tuning method: DDS synthesizer method, 20 stations random memory tuning
Variable IF band filter: 50kHz, 75kHz, 100kHz, 150kHz, 250kHz, 500kHz switchable
FM detection method: Digital FM demodulation method
Stereo demodulation method: DS-DC method
Digital output (IEC 60958): COAXIAL/0.5Vp-p, sampling frequency/48kHz/24bit
Output impedance: BALANCED (balanced XLR type)/100Ω (50Ω/50Ω), LINE (unbalanced)/50Ω
Meter: Signal strength/multi-path switching type
Power supply: AC100V, 50/60Hz
Power consumption: 20W
Maximum external dimensions: (W) 465 mm × (H) 151 mm × (D) 406 mm
Mass: 13.0kg
[Attached Remote Commander (RC-430)]
Remote control method: Infrared pulse method
Power supply: DC3V, dry cell/2 AA type used
Maximum external dimensions: 50 mm × 192.5 mm × 21.5 mm
Weight: 210g (including batteries)
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