Technics ST-G4
¥ 39,800 (around 1986)
Commentary
FM/AM tuner focusing on basic performance.
Twin quartz is introduced, and quartz control is introduced in two places of front end part and MPX circuit.
The front end section achieves stable tuning by obtaining an accurate tuning frequency through quartz oscillation, while the MPX circuit achieves high stereo separation and low distortion by introducing quartz control.
A double PLL configuration is adopted in which the second PLL based on the quartz oscillation signal is multiplied by the PLL in the stereo demodulation circuit. The free running frequency of the VCO (voltage controlled oscillator), which fluctuates due to environmental changes such as temperature and humidity, is always accurately locked at 19 kHz.
Equipped with linear switching MPX / IC, the switching section is greatly simplified, and the dynamic switching section without nonlinear elements is constructed, and linearity is remarkably improved.
The DC configuration of amplification, detection, and stereo demodulation realizes more faithful waveform transmission.
Equipped with a signal fidelity indicator that enables a lit high-quality air check.
Equipped with a quartz trek level check function, it can output a 333 Hz reference signal with an accuracy of 99.999% and can be used to set the recording level of the deck.
Equipped with a signal strength lead-out function that digitally displays the input signal strength of the receiving station.
A total of 16 FM/AM random access memories are installed.
Equipped with auto-scan tuning and auto-memory function.
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Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76.1 mhz to 89.9 mhz |
| Practical Sensitivity (75 Ω) | 10.3dBf/0.9 μ V (IHF' 58) |
| SN50dB Sensitivity (75 Ω) | Mono : 18.1dBf/2.2 μ V (IHF' 58) Stereo : 38.1dBf/22 μ V (IHF' 58) |
| Distortion factor | mono:0.02% stereo:0.03% |
| Dynamic range | 106 dB (1 kHz, 100% mod, 0 dB) |
| Frequency characteristic | 4 hz to 18 khz + 0. 2-0. 5 db |
| Effective selectivity | Normal : 60 dB (± 400 kHz) |
| Capture ratio | 1.0dB |
| Image interference ratio | 63dB(83MHz) |
| IF interference ratio | 100dB(83MHz) |
| Spurious interference ratio | 85dB(83MHz) |
| AM suppression ratio | 55dB |
| Stereo separation | 53dB(20Hz) 65dB(1kHz) 50dB(10kHz) |
| Leak Carrier (19 khz) | -70dB |
| <AM Tuner Section> | |
| Receiving frequency | 522 kHz to 1629 kHz |
| Practical sensitivity (S/N = 20 dB) | 290 μ V/m, 20 μ V |
| Selectivity | 50dB |
| Image interference ratio | 40dB |
| IF interference ratio | 60dB |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 9W |
| External dimensions | Width 430x Height 64x Depth 241 mm |
| Weight | 2.2kg |