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| Lo-D FT-8000 |
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| 75,000yen(around the 1979 time) |
The digital synthesizer tuner only for FM which
aimed at the improvement in operationalities, such as a high precision property
by the Quartz nowait-lock digital synthesizer, and six-game preset tuning by
microcomputer control.
Automatic tuning is realized by introducing a
microcomputer and the quick syntony to the office of choice is enabled by the
key button of automatic tuning which was prepared as for a up and two downs.
If a button is pushed, the sweep of the received frequency will be carried
out every 100kHz, a computer catches a broadcast wave, and the rest is tuned in
only by issuing a verb of a syntony.
Moreover, six-game preset tuning is
also possible. If the memory way presses the memory key, and the channel button
of choice of the memory of six games is pushed, receiving the office which you
want to memorize while a memory write-in window lights up, it will be completed.
A received frequency is locked at intervals of 100kHz by what the Quartz
synthesizer scheme adopted, and 、 aligns in the distorted minimum point.
Furthermore, the stable tuning
which is not influenced by a temperature and humidity is maintained.
In
the front end part, the double tune was adopted as the RF amplifier, input
stage, and interstage which use the dual gate MOS FET, respectively, and a high
sensitivity and high selectivity are realized.
Furthermore, it is considered
as the structure strong against jamming by preparing RF automatic gain control
circuit.
In order to remove the 19kHz pilot signal transmitted from a
broadcast station at the time of a stereo, PLL IC with pilot signal cancellation
is adopted.
In order to improve a basic performance, the highly precise
thing selected carefully by component-partses each is adopted.
The high
precision component partses of less than ±1% of the allowable error were adopted
as the demphasis circuitry, and the high quality is realized.
The
digital display which displays a received frequency can also be used as a quartz
watch by pushing a time stamp switchpoint.
Moreover, since time is
automatically displayed when the power switch is turned off, using as an exact
quartz watch is possible except the time of a broadcast reception.
When
a building takes in a radio wave from a 聴 antenna etc., in order to prevent
receiving an inter-modulation stonewalling with television, TV trap circuit is
carried in the set rear view.
The muting circuit drove the reed relay
switchpoint in the schmidt-trigger circuitry, and it has prevented the pop sound
at the time of a syntony while it raises a mute depressing effect of -85dB or
more.
The five-step signal indicator by light emitting diode is carried.
The Rec level checking switchpoint is carried.
The
multipath switchpoint is carried.
A 75-ohm coaxial connector is adopted
as an antenna input.
The output-terminal and cable of gilding are attached.
There was also a silver model besides a black model.
|
| Form |
FM digital synthesizer tuner
|
| Circuit system |
Microcomputer control
Digital
synthesizer scheme
MOS FET adoption RF stage
5-unit electronic tuning
front end
Quadrature detection
PLL MPX |
| Received frequency |
76MHz - 90MHz |
| S/N50dB sensitivity (IHF / new IHF)
|
mono: 4.8 microvolts / 18.7dBf
stereo:
45 microvolts / 38.2dBf |
| THD (400Hz) |
mono:0.12%
stereo:0.12%
|
| Capture ratio |
1.0dB |
| Effective selectivity |
80dB |
| Inter-modulation stonewalling ratio
|
95dB(2.5MHz) |
| S/N |
mono:75dB
stereo:72dB |
| Stereo separation |
50dB |
| Frequency characteristic |
20Hz-15kHz+0.2 -0.6 dB |
| Image stonewalling ratio |
110dB |
| IF stonewalling ratio |
94dB |
| AM supression ratio |
60dB |
| Antenna |
300-ohm unbalance
75-ohm equilibrium
|
| Supply voltage |
AC100V, 50Hz/60Hz |
| Power dissipation (Electrical Appliance and
Material Control Law) |
17W |
| Dimensions |
Width 435x height 78x depth of 369mm
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| Weight |
6.1kg |
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