Aurex ST-220
¥ 27,800 (around 1976)
Commentary
An FM/AM tuner equipped with a dial scale with a long running distance and an FM center tuning meter.
The front end uses a FM3 series varicon and FET to ensure high sensitivity, and the intermediate frequency section uses a phase linear ceramic filter.
A PLL IC is used for the MPX part of the FM tuner.
An FM muting circuit is built in to suppress noise between stations.
There are two types of output terminals, fixed and variable.
.jpg)
Model Rating
| Type | FM/AM Tuner |
| Circuit system | Stereo demodulation circuit using 3-row varicon and super-heterodyne PLL-IC |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Practical sensitivity | 2.0 μ V (IHF) |
| Harmonic distortion factor | stereo:0.4% mono:0.2% |
| Signal-to-noise ratio | stereo:65dB mono:70dB |
| Frequency characteristic | 50 Hz to 15 kHz ± 1 dB |
| Effective selectivity | 55dB |
| Image interference ratio | 55dB |
| IF interference ratio | 75dB |
| Capture ratio | 1.5dB |
| Spurious interference ratio | 80dB |
| AM suppression ratio | 50dB |
| Stereo separation | 35dB(1kHz) |
| Rated output | Fixed : 450 mv (400 hz, 100% modulation) Variable : 0 ~ 600 mV (400 Hz, 100% modulation) |
| Antenna terminal | 300 Ω balanced, 75 Ω unbalanced |
| <AM Tuner Section> | |
| Receiving frequency | 525 to 1,605 kHz |
| Practical sensitivity | 300 μ V/m (IHF) Bar Antenna 20 μ V (IHF) |
| Image interference ratio | 30dB |
| IF interference ratio | 35dB |
| Signal-to-noise ratio | 40dB |
| Selectivity | 25dB |
| Antenna terminal | Ferrite bar antenna External antenna terminal |
| <Others> | |
| Semiconductor used | Transistor : 11 FET : 1 Diode : 17 pcs IC : 2 LED : 2 pcs |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 4W |
| External dimensions | Width 400x Height 126x Depth 318 mm |
| Weight | 4.5kg |