||DA-F15: 60,000yen(around the 1978 time)
|DA-F15S: 59,000yen(around the 1979 time)
FM tuner which adopted the Quartz PLL synthesizer
The Quartz PLL synthesizer system is adopted and local
oscillation frequency is controlled by the 100kHz primitive signal which made
the crystal (6.4MHz) high-precision as a vibrator 1/64 by the divide term.
Thereby, for 76-90MHz could be correctly aligned and locked at intervals of
100kHz, and also the frequency system of a local oscillator has realized
accuracy as high as ±3kHz (-10-+60 degrees C).
By this system, since it
always locks in the frequency of a broadcasting station, as for the distorted
characteristic and separation characteristic etc., the optimal value is always
The lock indicator is adopted, and the freerunning frequency
of the local oscillator has shifted to which by lighting of three light emitting
diodes, or it can check at a glance.
The degree of selection of IF stage
is made into Narrow and the change type of Wide, and is made into 2 block
configurations which became independent, respectively.
In the degree Narrow
of selection, it becomes the composition of two ceramics filters [ four ], and
it becomes the composition of a 4 pole +6 pole phase linear LC filter, and
becomes a high selection degree tuner with quantity S/N and a low distorted
tuner at Wide again.
Low distorted-ization is attained by adoption of
the 4 pole +6 pole phase linear filter.
Moreover, while adopting the
discrete transformer of an establishment meter, and PLL MPX IC and improving a
THD, improvement in S/N, a stereo separation, and temperature stability is aimed
The front end part is raising stability by adoption of low dual gate and MOS FET of the noise figure selected carefully, a precision 5-unit variable
condenser, a balanced mixer, etc.
The air-check oscillator (calibrator)
is built in.
There were two kinds, DA-F15 which equipped the carrying
handle for rack-mounted one, and DA-F 15S which has not equipped the carrying
||FM stereo tuner
||1.8 microvolts (10.3dBf)
|The degree of effective selection (±400kHz)
|S/N ratio (stereo)
|Image disturbance ratio
|IF disturbance ratio
|Spurious disturbance ratio
|AM oppression ratio
|THD (stereo, 1kHz)
|Career leak oppression ratio
||30Hz-15kHz+0.5 -1.0 dB
|An Output voltage/impedance
||DA-F15: Width 480x height 108x depth of
DA-F 15S: Width 424x height 108x depth of 345mm