DIATONE DA-F10
¥ 50,000 (around 1976)
Commentary
Feature series FM/AM tuners.
A 4-pole phase linear LC block filter is used filter is used in the front-end mixer stage, a 6-pole phase-linear-type LC block filter is used in the IF stage, and a PLL IC is used in the MPX stage separation.
A newly developed lock tuning circuit has been adopted to enable accurate tuning.
The tuning point is maintained regardless of changes in temperature and humidity, and low distortion rate and high separation are obtained.
The selection degree of the IF stage can be switched between Narrow and Wide.
In the Narrow mode, the IF stage is a high selectivity tuner composed of a 6-pole phase linear LC block filter + 4-element ceramic filter.
In the Wide mode, the IF stage has group delay flat characteristics due to the 6-pole phase linear LC block filter, and becomes a low-distortion tuner.
The dual-gate MOS FET and the concentrated filter in the mixer stage provide a front end with excellent intermodulation interference characteristics.
The control IF circuit is a dedicated circuit independent from the signal IF circuit.
As a result, the group delay and amplitude characteristics of the signal IF circuit are not disturbed and the basic performance of the tuner is not adversely affected.
Model Rating
Type | FM/AM Tuner |
FM Tuner Section | |
Practical sensitivity | 1.8 μ V, 10.4 dBf (IHF) |
Effective selectivity | Wide:45dB Narrow:75dB |
Capture ratio | Wide:0.8dB Narrow:1.5dB |
AM suppression ratio | Wide:60dB Narrow:55dB |
Harmonic distortion factor | Wide : 0.1% (1 kHz, stereo) Narrow : 0.3% (1 kHz, stereo) |
Separation | Wide:50dB(1kHz) Narrow:40dB(1kHz) |
S/N | Mono : 75 dB Stereo : 70 dB |
Image interference ratio | 85dB |
IF interference ratio | 90dB |
Spurious interference ratio | 85dB |
Frequency characteristic | 30 Hz to 15 kHz ± 0.5 dB |
<AM Tuner Section> | |
Practical sensitivity | 50dB/m (bar antenna, IHF) |
Selectivity | 25dB |
S/N | 55dB |
Image interference ratio | 40dB |
<Audio section> | |
Output / Impedance | 450mV/5k Ω (FIXED 100% Modulation) 0 ~ 1.2V/2k Ω (VARIABLE 100% Modulation) |
<General> | |
Number of semiconductors | 3 fet, 5 ic, 35 tr, 19 di |
Pwer | AC100V 50Hz/60Hz |
Power consumption | 15W |
External dimensions | Width 425x Height 169x Depth 264 mm |
Weight | 7kg |