Audio Database


48,000yen(around the 1978 time)

FM stereo tuner which adopted the Quartz PLL synthesizer system.

The Quartz PLL synthesizer system is adopted. By this system, the signal which serves as a 100kHz standard by making into 1/64 the 6.4MHz signal acquired from the crystal oscillator with high frequency accuracy by a frequency divider is made. The phase of this 100kHz pulse and a local oscillator output is compared, and local oscillation frequency is controlled so that phase difference becomes small, when there is phase difference.

The stereo demodulator of a pilot cancellation system is adopted.
This pilot cancellation system has negated the pilot signal by adding the pilot signal of negative phase to the input of a decoder. Thereby, there is no leak of a 19kHz pilot signal in the output of a stereo demodulator.

The 5-unit variable condenser precision [ only for FM ] is used for the front end part, and exact dial plate accuracy and stability have been acquired.
Moreover, in the high frequency magnification stage and the mixed stage, the low dual gate MOS FEt of the noise figure selected carefully was used for RF tuning circuit, the 4 pole phase straight line type LC filter was used for the double tuning circuit and the mixer transformer, and the outstanding spurious disturbance characteristic and inter-modulation disturbance characteristic have been acquired.
Moreover, the local oscillating circuit has put these parts on the glass epoxy radical board using the oscillation coil containing an aluminum core, and the Teflon trimmer capacitor.

The phase has adopted the straight line 4 pole phase straight line type LC filter as IF stage over the large frequency range.
Moreover, the characteristic excellent in adopting the discrete transformer of an establishment meter and PLL MPX IC is realized.

The air-check oscillator (calibrator) which oscillates a 440Hz beep with the same output as the time of FM50% abnormal conditions is built in.


Rating of a mode
Form FM stereo tuner
Circuit system Quartz PLL synthesizer system
MOS FET 5-unit variable condenser
Practical speed 1.8 microvolts
Capture ratio 1.0dB
The degree of effective selection 70dB
S/N ratio mono:80dB
Image disturbance ratio 110dB
IF disturbance ratio 110dB
Spurious disturbance ratio 100dB
AM oppression ratio 65dB
THD mono:0.08%
Stereo separation 50dB(1kHz)
Frequency response 30Hz-16kHz+0.5 -1.0 dB
An Output voltage/impedance 150mV/5kohm
Power source AC100V, 50Hz/60Hz
Power consumption 11W
Dimensions Width 270x height 70x depth of 249mm
Weight 3.5kg
Attachment PIN-PIN cord
T character type FM antenna
Hexagon head wrench