The FM/AM digital synthesizer tuner in which the
microcomputer was carried.
With a microcomputer, the office of hope can
be quickly aligned only by pushing an up-and-down button selector, 100kHz is
used on FM, the sweep of the received frequency is carried out every 9kHz by AM, and a computer catches a broadcast wave.
The aligning point is controlled by
Quartz and exact tuning is possible for it.
Since it has the memory key,
presetting of seven games is possible for AM/FM.
The way of a memory set
will be completed, if the office which you want to memorize is received, the
memory key is pressed, and the button of the channel of choice is pushed while a
memory write-in window lights up.
By the Quartz synthesizer scheme, on FM, it is carried out at 100kHz, the
Quartz nowait lock is carried out at intervals of 9kHz by AM, and the tuning
point where the aligning point was stabilized without distortion for a
long time is maintained.
The double tune was
adopted as the RF section which uses the front end dual gate MOS FET, and the
high gain and high selectivity of the RF section are realized.
the inter-modulation stonewalling generated in the real field where an inside
strong electric-field office floods by adoption of a wide band automatic gain
control circuit is prevented.
The intelligence on a preset frequency or
a last channel can be memorized by a Battery (AA x 3), a timer is connected at
the time of a sudden power-down or an absence sound recording, and the
description of memory is maintained also to an in use.
The Battery can use
it for about two years, if it sets once.
The received frequency is
displayed with the vacuum fluorescent tube. Moreover, it can be judged with a
station indicator whether the channel of a preset throat is received.
muting circuit drives a reed relay in a schmidt-trigger circuitry.
And while acquiring a mute depressing effect of -80dB or more, the pop sound generated in
a key operation, power-switch on/off, etc. was prevented, and the comfortable
operationality is realized.
The five-step signal indicator by light
emitting diode is carried.
A 75-ohm coaxial connector is carried in FM
||FM/AM digital synthesizer tuner
|<FM tuner part>
||76.1MHz - 89.9MHz
||1.9 microvolts (300 ohms, IHF)
|SN ratio a sensitivity of 50dB
|effective selectivity (IHF)
|<AM tuner part>
||531kHz - 1,602kHz
||Width 435x height 105x depth of 273mm