AIWA S-R7
¥ 36,000 (around 1979)
Commentary
FM/AM tuner of mini component my Pace series.
Quartz synthesizer tuning system is adopted.
In this method, the frequency of the oscillator circuit is compared with that of the quartz oscillator circuit, and the PLL circuit controls it so that correct tuning can always be performed.
This system uses a variable capacitance diode (varactor diode) without using a varicon.
Equipped with a preset / one touch direct channel selection function, up to six FM/AM stations can be preset.
For the preset method, press the memo Leaky after selecting a channel, and while the green indicator lights up for 5 seconds, press the desired key to be preset. The preset is stored in that key.
Auto tuning and manual tuning are possible.
The IF stage employs a ceramic filter with flat group delay characteristics, and the detection stage incorporates a quadrature detection circuit using a wide-band and flat phase detection coil.
PLL-IC is used for the MPX circuit, and good separation is obtained.
A muting circuit linked with mono and stereo switching is adopted.
Equipped with LED5-point signal meter.
Equipped with high blend circuit.
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76.0 mhz to 90.0 mhz |
| Practical sensitivity | 1.9 μ V (300 Ω) / 10.8 dBf |
| Capture ratio | 1.5dB |
| Effective selectivity | 70 dB (± 400 kHz) |
| Signal-to-noise ratio | mono:75dB stereo:72dB |
| Image interference ratio | 80dB |
| IF interference ratio | 90dB |
| Spurious interference ratio | 90dB |
| AM suppression ratio | 55dB |
| Harmonic distortion factor | mono:0.1%(1kHz) stereo:0.2%(1kHz) |
| Frequency characteristic | 30 Hz ~ 15 kHz + 0.5 -1.5 dB |
| Stereo separation | 45dB(1kHz) |
| <AM Tuner Section> | |
| Receiving frequency | 531 kHz to 1602 kHz |
| Practical sensitivity | Bar antenna : 250 μ V/m External antenna : 30 μ V |
| Selectivity | 30dB |
| Signal-to-noise ratio | 50 dB (100 dB input) |
| Image interference ratio | 45dB |
| IF interference ratio | 35dB |
| <Audio section> | |
| Output Level / Impedance | FM : 150mV/2.4k Ω (at 1 kHz, 30% modulation) AM : 125mV/2.4k Ω (1 kHz at 30% modulation) |
| Power Supply Unit and Others | |
| Power consumption | 9w |
| External dimensions | Width 250x Height 71x Depth 280 mm |
| Weight | 2.4kg |
| Attachment | Stereo pin code FM feeder antenna |