Lo-D FT-4700
¥ 35,000 (released in 1979)
Commentary
FM/AM tuner focusing on basic performance.
In addition to adopting a dual-gate MOS FET for the front end section, the selectivity of the high-frequency stage has been raised to reduce intermodulation interference at strong input and to improve the distortion factor characteristics.
The IF section uses three 2-element ceramic filters with better phase characteristics than conventional ones and a highly integrated IC (HA11211) to improve the distortion factor characteristics and selectivity characteristics.
The multi-circuit uses a phase-locked loop (PLL) IC developed by combining Hitachi's IC technology to achieve low distortion.
It is equipped with an anti-distortion filter to prevent the generation of Birdie by the radio wave and stereo control of two broadcasting stations close together.
A loop antenna dedicated to AM is mounted.
The ceramic filter used in the AM tuner section has a wider band than in the past, enabling sound to be extended to a higher range.
In addition, a 9 kHz trap coil is used to eliminate interference from neighboring stations.
Equipped with a mode / muting switch that combines mode switching and muting functions into one.
Terminal for FM75 Ω coaxial cable is mounted.
Model Rating
Type | FM/AM Tuner |
FM Tuner Section | |
Receiving frequency | 76 MHz to 90 MHz |
Practical sensitivity | 1.05 μ V (75 Ω, IHF) 11.7 dBf (new IHF) |
SN ratio 50 dB sensitivity | Mono : 3 μ V/14.8 dBf Stereo : 40 μ V/38dBf |
Effective selectivity (IHF) | 70dB |
Signal-to-noise ratio | mono:75dB stereo:70dB |
Strain Rate (400 Hz) | mono:0.04% stereo:0.08% |
Separation (1 kHz) | 50dB |
Frequency characteristic | 30 Hz to 15 kHz + 1 -2dB |
<AM Tuner Section> | |
Receiving frequency | 530 kHz to 1,605 kHz |
Practical sensitivity | 12 μ V (IHF) 300 μ V/m (loop antenna) |
Selectivity (± 9 dB) | 32dB |
Signal-to-noise ratio | 53dB |
Strain Rate (400 Hz) | 0.4% |
<Others> | |
Power consumption | 8W |
External dimensions | Width 435x Height? x Depth 319 mm |
Weight | 6.0kg |