• Paese
• Cina (Repubblica Popolare Cinese)

• Produttore / Marca
• Keduosheng Technology Co., Ltd. (Qodosen); Huizhou City

• Anno
• 2023 ?

• Categoria
• Radio (o sintonizzatore del dopoguerra WW2)

• Radiomuseum.org ID
• 356699

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

• Numero di transistor
• A semiconduttori.

• Semiconduttori

• Principio generale
• DSP, Processore di segnale digitale

• Gamme d'onda
• Onde medie (OM), lunghe (OL), piú di 2 gamme di onde corte (> 2 x OC) e MF (FM).

• Tensioni di funzionamento
• Batterie / presa di alimentazione supplementare / Li-Ion 3.7 / USB 5 Volt

• Altoparlante
• AP magnetodinamico (magnete permanente e bobina mobile) / Ø 4 cm = 1.6 inch

• Potenza d'uscita
• 1 W (indistorta)

• Materiali
• Plastica (non bachelite o catalina)

• Radiomuseum.org
• Modello: FM Stereo/LW/MW/SW Multi-Band Radio SR-286 - Keduosheng Technology Co., Ltd

• Forma
• Tascabile (portatile molto piccola), < 20 cm

• Dimensioni (LxAxP)
• 128 x 75.5 x 38 mm / 5 x 3 x 1.5 inch

• Annotazioni

• The QODOSEN SR-286 portable receiver employs one advanced performance tuner chip from the automotive industry. It features FM-RDS Stereo and AM bands, squelch, clock/world clock, sleep timer and alarm.

  The SR-286 was followed by the DX-286. They share the same chassis and cabinet, but the DX version firmware was modified to feature different way to invoke some functions that requires two-key combination on the RS version.

  Main features

  • FM-R(B)DS: 64 - 108 MHz, 76 - 108 MHz, 87 - 108 MHz, 87.5 - 108 MHz (200, 100, 50, 10 kHz steps)
  • SW: 1711 - 27000 kHz (1 & 5 kHz steps)
  • MW: 522 - 1620 kHz (1 & 9 kHz steps), 520 - 1710 kHz (1 & 10 kHz)
  • LW: 144 - 519 kHz (1 & 3 kHz)
  • Sensitivity
    • On telescopic antenna:
      • FM: <= 0.5 µV (30 dB S/N)
      • SW, LW, MW: <= 10 µV (20 dB S/N)
    • On built-in magnetic antenna
      • LW: <= 2 mV/m (20 dB S/N)
      • MW: <= 1 mV/m (20 dB S/N)
  • Selectivity:  >= 60 dB
  • Bandwidth
    • FM: 17 bandwidths and Auto, selectable
    • AM: 3/4/6/8 kHz
  • Manual, direct, and automatic tuning with storage
  • 1000 memory presets
  • Built-in LNA, selectable
  • Built-in antenna attenuator
  • Audio output power: 1 Watt at 10% THD
  • Audio tone control
  • 3.5mm extenal antenna jack
  • 3.5mm Stereo 32 Ohm earphones jack
  • Power supply: Removable rechargeable 18650 Lithium Battery 
  • Micro-USB charger port, 5 V, 500 mA
  • Shutdown current: 150 µA
  • Quiescent current: 190 mA

  Brief technical details

  This unit features four PCB assemblies: PCB Antenna Socket "2023-6-15", PCB Receiver "SR-268V04 2023-8-18", PCB MCU/Audio/Display "SR1KV05 2023-8-10", and PCB KB/PWR "SR1AJV02 2023-6-1". Older PCB versions exists, like MCU/Audio/Display "SR1AJV03 2023-8-8" and Receiver "SR-268V02 2023-6-25"

  The RF tuner uses a F8605/TEF6686AHN by NXP chip. The speaker is driven by a 8002D chip, and the earphones by a LM4809 chip.

  The radio is managed by an non marked 80-pin chip and a 24C32A memory chip. Additional active components are used, like a 74HC595D shift register chip, a charger chip, a few LDO regulators, and control transistors.

• Peso netto
• 0.2 kg / 0 lb 7 oz (0.441 lb)

• Autore
• Modello inviato da Jose Mesquita. Utilizzare "Proponi modifica" per inviare ulteriori dati.

• Altri modelli

• In questo link sono elencati 1 modelli, di cui 1 con immagini e 1 con schemi.
  Elenco delle radio e altri apparecchi della Keduosheng Technology Co., Ltd. (Qodosen); Huizhou City