Pioneer F-535
¥ 29,800 (released in 1989)
Commentary
A digital synthesizer tuner that employs a silent servo circuit and CCTS circuit to improve noise.
In conventional tuners, the PLL circuit and microcomputer section operate even after tuning is completed. The PLL circuit causes noise caused by harmonics and PLL loop, and the microcomputer section causes adverse effects such as harmonics of clock frequency.
In the silent servo circuit mounted on the F-535, the PLL circuit and microcomputer circuit are stopped after tuning is completed to receive the signal as an analog tuner. Therefore, noise caused by these circuits is not generated in principle, and noise is successfully reduced.
It is equipped with a CCTS circuit that enables high sensitivity reception by equalizing the receiving frequency and the resonance frequency of the antenna stage.
This reduces the distortion.
It is equipped with an AM servo circuit, and AGC (automatic gain control) is operated when AM is received. By setting this to an appropriate state when receiving and when receiving is completed, distortion is reduced and AM low-frequency distortion and high-frequency characteristics are improved.
It is equipped with FM/AM random 24 station presets. The preset is completed by adjusting the frequency to be preset with the tuning button, pressing the memory button, and pressing any tuning button while the display is blinking.
Honeycomb chassis and large insulator with excellent vibration damping characteristics are adopted.
In addition, high-quality sound condensers and resistors are used for acoustic components.
Stereo / mono, AM servo and silent servo ON/OFF can be stored in memory
Mode memory is installed.
Easy-to-read digital signal level display is adopted.
Equipped with DX/LOCAL mode memory.
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Model Rating
| Type | FM/AM Digital Synthesizer Tuner |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Practical sensitivity | Mono : 13.2 dBf (1.26 μ V/75 Ω) |
| S/N50dB sensitivity | Mono : 17.2 dBf (2.0 μ V/75 Ω) Stereo : 37.2 dBf (20.0 μ V/75 Ω) |
| Signal-to-noise ratio | mono:82dB stereo:79dB |
| Harmonic distortion factor (1 kHz) | mono:0.05% stereo:0.06% |
| Effective selectivity | 60dB(400kHz) |
| Stereo separation | 1kHz:44dB |
| Frequency characteristic | 30 Hz to 15 kHz ± 0.8 dB |
| Image interference ratio | 65dB |
| IF interference ratio | 110dB |
| AM suppression ratio | 57dB |
| Antenna input impedance | 75 Ω Unbalanced Type |
| <AM Tuner Section> | |
| Receiving frequency | 522 kHz to 1629 kHz |
| Practical sensitivity (attached loop antenna) | 350 μ V/m |
| Selectivity | 40dB |
| Signal-to-noise ratio | 54dB |
| Image interference ratio | 40dB |
| IF interference ratio | 55dB |
| Rated Distortion Factor (AM Servo ON) | 0.19%(1kHz) 0.4%(100Hz) |
| Antenna | Loop antenna (included) |
| <General> | |
| Output Level / Impedance | FM (100% modulation) : 650mV/5.1k Ω AM (30% modulation) : 150mV/5.1k Ω |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption (Electrical Appliance and Material Control Law) | 10W |
| External dimensions | Width 420x Height 85.5x Depth 318 mm |
| Weight | 3.5kg |