Audio Database

The

DIATONE M-F05
28,000yen(around the 1978 time)

Description
 
The FM/AM tuner of the compact size designed considering coexistence of the audiovisual apparatus characteristic and the communication machine characteristic as the first.

Twin color tuning is adopted, and if alignment can be taken, the color of the lighting of the whole dial plate scale will change from a white to green.

In FM front end part, high sensitivity-ization is attained by using the small dual gate MOS FET of NF for a high frequency magnification stage. Furthermore, various disturbance exclusion capability is also raised with the empty core coil and the frequency straight line type variable condenser.
Moreover, the empty core coil is used for a local oscillator, the variable condenser for a local oscillation is formed into a wide gap, and high frequency stability is maintained.

The FM-IF stage is constituted by four linear phase type ceramics filters and three steps of differential amplification excellent in the phase characteristic. The limiter stabilized by this was applied and the outstanding phase characteristic has been acquired.

The broadband Quadrature detection circuit is adopted as a detection circuit, and low distortion reception is enabled.
Moreover, PLL type IF which was excellent in temperature characteristics is adopted as a MPX circuit, and the separation characteristic and the distortion characteristic of having excelled over the large zone are acquired.

AM receiving circuit has adopted the circuit composition of all IC.

Signal meter and tuning meter are carried.

Front

Rating of a mode
Form FM/AM tuner
<FM tuner part>
Circuit system Frequency straight line type triple variable condenser
Quadrature detection circuit
PLL MPX
Practical speed 1.9 microvolts
Capture ratio 1.0dB
The degree of effective selection 60dB
S/N ratio mono:75dB
stereo:72dB
Image disturbance ratio 60dB
IF disturbance ratio 80dB
Spurious disturbance ratio 80dB
AM oppression ratio 55dB
THD mono:0.2%
stereo:0.3%
Stereo separation 40dB(1kHz)
35dB(10kHz)
Frequency response 30Hz-15kHz±3dB
<AM tuner part>
Circuit system Dual-unit variable condenser
Practical speed 150microvolts/m
The degree of effective selection 30dB
S/N ratio 55dB
Image disturbance ratio 40dB
IF disturbance ratio 50dB
Spurious disturbance ratio 40dB
THD 0.8%
<Synthesis>
An Output voltage/impedance 150mV/5kohm (30% abnormal conditions)
Power source AC100V, 50Hz/60Hz
Power consumption 11W
Dimensions Width 270x height 70x depth of 258mm
Weight 3.5kg
Attachment T character type FM antenna
Hexagon head wrench