|42,800yen(around the 1981 time)
The synthesizer tuner which aimed at improvement in operativity taking advantage
of the merit of a digital tuner.
It corresponded to frequency
arrangement of each broadcasting station of FM/AM, and the synthesizer system
with which FM aligns with 100kHz and AM sides every 9kHz is adopted.
This system carries out phase comparison of the standard frequency obtained
from a crystal oscillator, and the local oscillation frequency, since it
forms PLL which controls a varactor diode, does not have a drift of local
frequency, either and is enabling good and stabilized reception.
Functions, such as
preset tuning (one-touch tuning), auto tuning, and manual tuning, are also
In preset tuning, if the seven FM/AM each preset function is
carried and a favorite broadcasting station is tuned in, a memory will be made
by pushing a memory button and a preset button (1-7).
In auto tuning, if auto is specified with a scanning button and a one push
of a rise or down of a tuning key is carried out, an electric wave is automatically
looked for to the one where frequency is higher, or the lower one, and
it stops with an exact aligning point. Furthermore, if the tuning key is
pressed again, the following aligning point will be looked for.
Manual tuning can be tuned in by
specifying a manual with a scanning button and operating each tuning key of a
rise and a down. The received frequency can catch the electric wave which it is
displayed with a digital counter and cannot be caught by auto tuning.
The IC memory circuit is carried and all the states before turning OFF a
power source are memorized.
The backup power supply which will operate for
five years or more is used for a memory circuit.
The front end uses for and constitutes the four-step varactor diode and
MOS FET equivalent to an analog-type 4-unit variable condenser type.
Moreover, the linear phase
ceramic filter which is compatible in a low distortion and the degree of high
selection is used for an intermediate frequency magnification stage (IF stage),
and it has improved the distortion in all the zones.
Quadrature detection IC
which has linear detection capability in a detection circuit over a broadband is
adopted, and PLL-MPX-IC is adopted as the MPX section.
In order to
transmit without degrading a music signal, the line amplifier of direct-current
composition from which the coupling capacitor was removed is adopted.
order to raise the sensitivity of AM, and S/N, the sound quality which does not
have a 9kHz beat obstacle by IF stage which made attenuation outside a zone
sharp, and which combined the coil with two steps of 3 terminal type high
selection degree ceramics filters has been obtained.
Furthermore, the small
low impedance loop type antenna strong against the noise in space is adopted.
This antenna has a back panel and free attachment and detachment, and they can
install it in the good place of a receiving state in about 1m.
secondary power transformer winding wire of the power-source part made it become
independent the object for digital display pipes, the object for synthesizer
parts, and for general circuits, and has realized operational stability of each
A dimmer switch can adjust the brightness of a digital display
to two steps.
The oscillator for a recording level check convenient for
an air check is built in.
An Output voltage corresponds on the frequency of
440Hz at the time of FM50% abnormal conditions.
The electronic change is
adopted as each function of FM/AM/Rec.Cal.
power-source on-off -- the
muting circuit which removes the following noise and the noise between offices
is built in.
|<FM tuner part>
||76.1MHz - 89.9MHz
||75ohm, 300ohm (terminal type)
||0.9 microvolt / 10.2dBf
||stereo: 15.8 microvolts / 35.2dBf
1.5 microvolts / 14.2dBf
(microvolt is 75-ohm o'clock and 0dBf is
10-15W (new IHF standard).)
|Image disturbance ratio
|IF disturbance ratio
|AM oppression ratio (IHF)
|The degree of effective selection
||20Hz-15kHz+0.2 -1 dB
|Signal to noise ratio
||stereo: 0.08% (at the time of 90% abnormal
mono: 0.06% (at the time of 100% abnormal conditions)
|Muting operation level
||0.6V (at the time of 100% abnormal
|<AM tuner part>
||A terminal type, loop form antenna attachment
|Practical speed (S/N20dB)
|The degree of selection
|Signal to noise ratio
||0.2V (at the time of 30% abnormal
|<Level check signal>
||440Hz sine wave
||0.3V (at the time of 50% abnormal
|Dimensions (a knob, a base, a terminal
||Width 434x height 66x depth of 266mm