ALPINE/LUXMAN T-105
¥ 44,800 (released in March 1985)
Commentary
Digital Synthsized FMAM Tuner of Brid series.
High-energy PLL circuit is used for the front end part.
In this circuit, the phases of the received signal and the reference signal are compared, and the loop gain of the PLL circuit is increased and the circuit impedance is lowered to increase the speed of response to perfect tuning.
The T-105 also uses the S. T. A. R. circuit, which is used in the Bridd series amplifier, to improve the reproducibility of sound silence.
The detection circuit uses a super wide FM detector that directly detects 10.7 MHz IF signals.
This is an FM detector that can linearly detect up to an ultra-wide bandwidth exceeding 5 MHz. While the bandwidth corresponding to 100% FM modulation is 150 kHz, it has more than 30 times the performance.
The RF stage is equipped with a dual MOS-FET and a spectrum AGC (automatic gain control) circuit. By operating the FET at the optimum gain according to the radio wave condition, the influence of RF intermodulation distortion is eliminated.
Equipped with a CS filter that cuts out interfering beats.
The CS filter is a circuit that eliminates beat interference without degrading distortion or channel separation because the high selectivity of the IF circuit cannot eliminate the beat interference when the Radio noises is more than 200 kHz away.
The local oscillator of the AM tuner section has an auto-level control.
This solves the problem of a large difference in sensitivity between the low frequency band and the high frequency band, and good sensitivity is obtained at all stations.
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Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Practical sensitivity of IHF | 0.9 μ V (75 Ω) 1.8 μ V (300 Ω) 10.3dBf |
| quieting sensitivity | 1.75 μ V (75 Ω) 3.5 μ V (300 Ω) 16.0dBf |
| Signal-to-noise ratio | mono:77dB stereo:75dB |
| Frequency characteristic | 20 Hz to 15 kHz ± 0.5 dB or less |
| Distortion factor | mono:0.09%(1kHz) stereo:0.15%(1kHz) |
| Selectivity | 70 dB (75 kHz dev. / ± 400 kHz) |
| IF interference ratio | 100 dB or more |
| Image interference ratio | 80 dB or more |
| Stereo separation | 50dB(1kHz) 45dB(100Hz) 30dB(10kHz) |
| Muting level | 5 μ V |
| Output voltage | 630mV(100%mod.) |
| <AM Tuner Section> | |
| Practical sensitivity of IHF | 53dB/m |
| Signal-to-noise ratio | 50dB |
| Distortion factor | 0.3% |
| IF interference ratio | 50dB |
| Output voltage | 250mV |
| <General> | |
| Power consumption | 10W |
| External dimensions | Width 438x Height 85x Depth 244 mm |
| Weight | 3.0kg |
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