Technics ST-C01
¥ 35,000 (around 1979)
Commentary
An FM/AM tuner that employs an active sensor system in which a bright arrow informs the dial tuning point.
It uses an active sensor with three LEDs for easy tuning.
When the FM station is not being received, the three LEDs remain lit. When receiving, the dial is turned according to the yellow arrows at both ends. When the arrow disappears and only the red LED in the center continues to light sharply, that is the perfect tuning point.
A ceramic filter with excellent group delay characteristics is used three times in the IF stage, and the amplifier circuit is composed of five differential stages to obtain high selectivity and low distortion.
The front-end RF stage employs a dual-gate junction FET with excellent high-frequency characteristics to obtain excellent IM interference removal capability.
It uses quadrature detection and PLL / MPX demodulation circuits.
Uses a precision finished die-cast cabinet that cuts off the internal circuit from interfering signals.
A 3-terminal regulator is installed in the constant voltage circuit.
.JPG)
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Practical sensitivity | 10.3 dBf (0.9 μ V, IHF' 58, 75 Ω) |
| SN ratio 50 dB sensitivity | Mono : 17.3 dBf (2.0 μ V, IHF' 58, 75 Ω) Stereo : 40.2 dBf (28 μ V, IHF' 58, 75 Ω) |
| Total harmonic distortion rate (1 kHz) | mono:0.1% stereo:0.15% |
| Signal-to-noise ratio | 75dB |
| Frequency characteristic | 20 Hz ~ 15 kHz + 0.5 -1.5 dBf |
| Effective selectivity | 75dB |
| Capture ratio | 1.0dB |
| Image interference ratio | 50dB(83MHz) |
| IF interference ratio | 85dB(83MHz) |
| Spurious interference ratio | 75dB(83MHz) |
| AM suppression ratio | 55dB |
| Stereo separation | 45dB(1kHz) 35dB(10kHz) |
| Leak carrier | -35dB |
| <AM Tuner Section> | |
| Receiving frequency | 525 kHz to 1605 kHz |
| Practical sensitivity | 30 μ V (SN ratio = 20 dB) |
| Selectivity | 30dB |
| Image interference ratio (1,000 kHz) | 55dB |
| <General> | |
| Output voltage | 0.5V |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 8W |
| External dimensions | Width 297x Height 49x Depth 255 mm |
| Weight | 2.9kg |