Audio Database

The

Lo-D FT-8000
75,000yen(around the 1979 time)

Description
 
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.


Rating of a mode
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
Weight 6.1kg