Audio Database

The

DIATONE DA-F900
34,800yen(around the 1972 time)

Description
 
It is the solid-state AM/FM tuner developed for the purpose of high sensitivity and the degree of quantity selection.

IC and a mechanical filter are adopted as IF stage, and the interference problem etc. is coped with.

The full-scale LC type career leak filter is adopted, and career leak (19kHz and 38kHz) is prevented.

The signal meter in which field-strength is shown, and the tuning meter in which an exact aligning point is shown are adopted.

The muting switch which can omit the unpleasant noise under tuning is carried.

The mechanical filter is adopted also as AM circuit and high sensitivity and the degree of high selection have been obtained with combination with a ferrite bar antenna.


Rating of a mode
Form Solid-state AM/FM tuner
<FM tuner part>
Received frequency 76MHz - 90MHz
Sensitivity 2.0 microvolts or less (iHF)
Distortion 0.5% or less (400Hz, 100% abnormal conditions)
Signal to noise ratio 60dB or more
Frequency response 20Hz - 16kHz
Capture ratio 2.0dB or less
The degree of effective selection 60dB or more
AM oppression ratio 45dB or more
Image disturbance ratio 60dB or more
Intermediate frequency disturbance ratio 70dB or more
Stereo separation 35dB or more (1kHz)
Antenna input impedance 300-ohm balance
75-ohm disequilibrium
<AM tuner part>
Received frequency 525kHz - 1,610kHz
Sensitivity 18 microvolts or less (IHF)
Image disturbance ratio 50dB or more
The degree of selection 35dB or more
Intermediate frequency disturbance ratio 40dB or more
Signal to noise ratio 45dB or more (30% abnormal conditions, 1 mV/m input)
<Synthesis>
Output voltage FM(400Hz, 100% abnormal conditions): 0V-1.5V
AM(400Hz, 30% abnormal conditions): 0V-1V
An attached mechanism FM muting
Signal meter
FM center tuning meter
SCA filter
Career leak filter
FM stereo indicator
Mechanical filter
FM mono-<=> stereo automatic change
Tape recording terminal
AM bar antenna
Level adjustment volume
The semiconductor used IC: One piece
Transistor: 17 pieces
FET: One piece
Diode: 20 pieces
Power source AC100V 50Hz/60Hz
Power consumption 15W
Dimensions Width 452x height 130x depth of 275mm
Weight 7kg