|
| Lo-D FT-4700 |
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| 35,000yen(1979 release) |
The FM/AM tuner which thought the basic performance as important.
While adopting the dual gate MOS FET as a front end part,
the selectivity of the RF stage is raised and the distortion property is raised
with the falloff of the inter-modulation stonewalling at the time of a strong
input.
Rather than before, using three two-element ceramics filters with
a still more sufficient phase response, high integration IC (HA11211) is used
for the IF section, and the distortion property and the selectivity property are
raised in it.
The low distortion is realized by adopting as a
multi-circuitry PLL(phase lock troop) IC which concentrated and developed IC
technology of the Hitachi.
In order that the radio wave of two broadcast stations which approached,
and a stereo control may prevent distortion from occurring, the anti birdie
filter is carried.
The loop antenna only for
AM is carried.
What has a band larger than before is adopted as the
ceramics filter of AM tuner part, and sound which has an elongation to a high
region is realized to it.
Moreover, a 9kHz traps coil is adopted and the
stonewalling of an adjacency office is eliminated.
The mode muting
switch which summarized the mode switching and the muting functionality to one
is carried.
The termination for FM75ohm coaxial cables is carried.
|
| Form |
FM/AM tuner |
| <FM tuner part>
|
| Received frequency |
76MHz - 90MHz |
| Practical speed |
1.05 microvolts (75 ohms, IHF)
11.7dBf
(new IHF) |
| SN ratio a sensitivity of 50dB |
mono: 3 microvolts / 14.8dBf
stereo: 40
microvolts / 38dBf |
| Effective selectivity (IHF) |
70dB |
| SN ratio |
mono:75dB
stereo:70dB |
| distortion (400Hz) |
mono:0.04%
stereo:0.08%
|
| Separation (1kHz) |
50dB |
| Frequency characteristic |
30Hz-15kHz+1 -2 dB |
| <AM tuner part>
|
| Received frequency |
530kHz - 1,605kHz |
| Practical speed |
12 microvolts (IHF)
300 microvolt/m
(loop antenna) |
| Selectivity (±9dB) |
32dB |
| SN ratio |
53dB |
| Distortion (400Hz) |
0.4% |
| <Others> |
| Power consumption |
8W |
| Dimensions |
Width 435x height ?x depth of 319mm
|
| Weight |
6.0kg |
|
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