|48,000yen(around the 1978 time)
FM stereo tuner which adopted the Quartz PLL
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
The stereo demodulator of a pilot cancellation system is
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
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.
||FM stereo tuner
||Quartz PLL synthesizer system
5-unit variable condenser
|The degree of effective selection
|Image disturbance ratio
|IF disturbance ratio
|Spurious disturbance ratio
|AM oppression ratio
||30Hz-16kHz+0.5 -1.0 dB
|An Output voltage/impedance
||Width 270x height 70x depth of 249mm
T character type FM antenna
Hexagon head wrench