|108,000yen(August, 1978 release)
FM tuner of a laboratory reference series.
By adopting a CLL scheme original with a Lux, reservation of a high syntony precision and a stability is aimed at to all received frequencies.
By this scheme, it is based on the transmit frequency of the broadcast station controlled by the quartz crystal, and has become a total control system having included even from the front end of a tuner to IF stage and the detection stage. Thereby, it is strong on external requirements, such as a temperature, and the stable reception is enabled.
Since the CLL circuitry
has a lock range for securing a capture range for uniting exactly, and a stable
receive state in the center frequency of a broadcast station as well as the PLL
circuitry which constitutes the feedback loop,If the radio wave of a broadcast
station once goes into a capture range and locks this, maintaining the receive
state which aligned correctly is continued by work of a powerful feedback
circuit. For this reason, even if a drift (gap of a received frequency) arises
by transition of external requirements, a feedback starts towards pursuing the
transmit frequency of the broadcast station controlled by the quartz crystal, and the stable receive state is acquired.
Since the relock circuitry is
built in the CLL circuitry, even if it turns OFF the power source of a tuner, it
is not necessary to relock again.
The accu-touch organization is carried
so that all the tuning circuits may be united with the center frequency of an
exact broadcast station.
The accu-touch organization has detected exact Centrepoint using the control
voltage of a CLL circuitry. A mechanical nowait lock is covered now over
a tuning knob. If the tuning knob is turned by the usual speed, a knob
is locked for about 1 second.
In IF stage, in order to reconcile the outstanding
distortion property and the outstanding selectivity property, two steps of IF
stage bandwidth switchovers, wide and narrow, are carried.
In the standard wide location, the wide band block filter considered as
2 sets of delay-characteristics serious consideration has realized the
low-distortion property. In the narrow location, 2 sets of narrow-band
ceramics filters were added, and the high selectivity property is realized.
In order to make front end demonstrate many
properties which excelled after IF stage, the 5-unit variable condenser only for
FM was adopted, and the selectivity of each RF amplifying circuit was raised, and sufficient stonewalling removal capacity is secured.
wide band detection circuitry which low-distortion-izing and a high SN ratio can
realize is combined with IF stage. Moreover, the phase response of a low pass
filter is improved with adoption of a MPX circuitry with a pilot cancellar.
Furthermore, DC amplifier stream composition is adopted as the audio stage.
|IHF practical speed
||1.7 microvolts (9.8dBf)
|50dB quieting sensitivity
||3.2 microvolts (15.2dBf)
||mono, stereo: 20Hz - -17kHz 0.5dB
||0.05% (wide, 100Hz)
0.05% (wide, 1kHz)
0.07% (wide, 6kHz)
0.15% (narrow, 1kHz)
||0.07% (wide, 100Hz)
0.06% (wide, 1kHz)
0.1% (wide, 6kHz)
0.4% (narrow, 1kHz)
|2 signal selectivity (±400kHz)
|IF stonewalling removal ratio
|Amplitude modulation suppression
|An Output voltage/impedance
||fix: 1V/100 ohm
||Tuning nowait-lock organization
The circuitry for a multipath verification
testing tone circuitry for a sound recording
FM muting circuit
Muting level adjustment
Output level control
The coaxial connector for 75 ohm
(Electrical Appliance and Material Control Law)
||Width 442x height 101x depth of 400mm