Lo-D FT-4700

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