KENWOOD KT-880
¥ 45,000 (around 1984)
Commentary
An FM/AM stereo tuner that uses Kenwood's FM technologies such as DLLD and DCC to achieve better reception and sound quality.
A direct-linear reception circuit is used to prevent the low signal-to-noise ratio (SNR) phenomenon that occurs at low frequencies due to the delicate tuning of the synthesizer.
It uses DLLD (Direct Linear Loop Detector) which is a wide-band linear detection system.
This circuit is a detection method that linearizes the 10.7 MHz IF signal directly and detects it with a closed loop detector. In addition, by installing a distortion correction circuit in the closed loop, the nonlinear distortion of the VCO and the distortion generated by the IF filter are also reduced to 0.
Since the DLLD is a closed-loop detector, the noise generated in the loop is suppressed, resulting in a detector with a high SN ratio.
DCC is used as an IF distortion correction circuit.
In this circuit, only the harmonic distortion component generated by the IF filter is extracted and canceled, so the distortion factor is greatly reduced.
A dual-gate MOS FET is used in the front-end RF-amplifier and MIX section to significantly improve the intermodulation characteristic, which is symbolic of Dainyu power characteristics.
You can record two stations in conjunction with the timer.
If you preset one station (CH-2 to CH-8) other than CH-1, the program memory receives the preset station when the power is turned on, and receives CH-1 when the power is turned on after the power is turned off.
In addition to the black model, there was also a silver model.
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Model Rating
| Type | DLLD Super Synthesizer FM/AM Tuner | ||||
| FM Tuner Section | |||||
| Receiving frequency range | 76 MHz to 90 MHz | ||||
| Antenna impedance | 75 Ω unbalance | ||||
| Sensitivity (75 Ω) | 0.95 μ V/10.8 dBf | ||||
| SN ratio 50 dB sensitivity | Mono : 1.8 μ V/16.2 dBf Stereo : 24 μ V/38.8 dBf |
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| Harmonic distortion factor (100% modulation) |
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| SN ratio (100% modulation, 85 dBf input) | mono:98dB stereo:88dB |
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| Capture ratio | Narrow:1.0dB | ||||
| Effective selectivity (IHF) | 60dB | ||||
| Stereo separation | 1kHz:68dB | ||||
| Frequency characteristic | 20 Hz to 15 kHz + 0.2 -0.8 dB | ||||
| Image interference ratio (84 MHz) | 90dB | ||||
| IF Interference Ratio (84 MHz) | 100dB | ||||
| Spurious interference ratio (84 MHz) | 100dB | ||||
| AM suppression ratio (65.2 dBf) | 65dB | ||||
| Subcarrier suppression ratio | 70dB | ||||
| Output Level / Impedance | FM (1 kHz, 100% modulation) : 0.6V/3.3k Ω | ||||
| <AM Tuner Section> | |||||
| Receiving frequency range | 531 kHz to 1602 kHz | ||||
| Sensitivity | 10 μ V / 300 μ V/m | ||||
| Harmonic distortion factor (1000 kHz) | 0.3% | ||||
| Image interference ratio (1000 kHz) | 40dB | ||||
| IF Disturbance Ratio (1000 kHz) | 60dB | ||||
| Selectivity (IHF) | 30dB | ||||
| Output Level / Impedance | 0.18V/3.3k Ω | ||||
| Signal-to-noise ratio (30% modulation, 1 mv input) | 50dB | ||||
| <General> | |||||
| Power supply voltage | 100 VAC, 50Hz/60Hz | ||||
| Rated power consumption (Electrical Appliance and Material Control Law) | 10W | ||||
| External dimensions | Width 440x Height 64x Depth 318 mm | ||||
| Weight | 3.3kg | ||||