• Paese
• Cina (Repubblica Popolare Cinese)

• Produttore / Marca
• Unknown - CUSTOM BUILT: China

• Anno
• 2023 ?

• Categoria
• Radio (o sintonizzatore del dopoguerra WW2)

• Radiomuseum.org ID
• 356606

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), più di 2 gamme di onde corte (> 2 x OC) e MF (FM).

• Particolarità
• Disco fisso o memoria allo stato solido; Radio with other functions

• Tensioni di funzionamento
• Batterie / presa di alimentazione supplementare / Li-Ion 3.7 or AA: 3 x 1.5 / USB 5 Volt

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

• Materiali
• Plastica (non bachelite o catalina)

• Radiomuseum.org
• Modello: LiJiANi AIR/VHF/FM/AM/SW/WB World band Radio RD239 - Unknown - CUSTOM BUILT: China

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

• Dimensioni (LxAxP)
• 138 x 85 x 28 mm / 5.4 x 3.3 x 1.1 inch

• Annotazioni

• The LiJiANi RD239 portable radio features BT 5.2, TF card player and recorder from radio, microphone or auxiliary input, clock and alarm, and sound equalizer. Two LED flashlights are also featured at the left side. The TF card can also be used to apply firmware updates, supplied by the manufacturer support team. The radio is also sold as Clooblut RD239.

  Main specifications

  • FM: 64 -108 / 76 - 108 / 87 - 108 / 87.5 - 108 MHz, selectable
  • AM: 520 - 1710 (10 Stepping) / 522 - 1620 (9 Stepping) kHz, selectable
  • SW: 3.20 - 29.99 MHz
  • VHF: 30.0 - 200 MHz
  • AIR: 118.0 - 138.0 MHz
  • WB: 162.400 - 162.550 MHz
  • 3.5 mm external antenna jack
  • 3.5 mm earphones
  • 3.5 mm auxiliary input
  • BT V5.2
  • TF Card: MP3/WAV/WMA, up to 256 GByte
  • Power Supply uses a dual battery system
    • Removable rechargeable Lithium BL-5C battery,
    • Or else 3 x "AA" dry batteries
  • USB-C port for
    • Charging the BL-5C battery (5V, 1A)
    • Connecting the radio to a computer to access the TF card

  Brief technical details

  There are at least two PCB assembly versions, a "2023.07.20 RD-239-A-V1.5" and a "20240122  RD-239-A-V1.61". This analysis covers the later version.

  The receiver uses a AKC6958 DSP (IC4) and a 2SC3356-R25. (Q1) in the RF front-end for the telescopic/external antenna used by all bands except for AM(MW). A LTK5802 audio power amplifier (IC1) drives the 4 Ohm, 3 Watt speaker. There is a down converter for the Air Band using two 2SC3356-R25 NPN RF transistors, one 2TY/S8550 PNP, and two RS2057 SPDT Analog Switches. A CXXC14B5C media player (IC3) manages the radio. Several devices handles the power supply and control functions, like a 4056A battery charger (IC5), a P14C1S over-voltage-protection (IC9), a TM74HC595 shift register (IC6),a  two XC6206P332MR/662K LDO regulators (IC7, IC8), a S8050/J3Y NPN (Q2), a SI2301 P-MOSFET (Q4), and two S9014/J6 NPN (Q5, Q6).

   

• 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 525 modelli, di cui 503 con immagini e 29 con schemi.
  Elenco delle radio e altri apparecchi della Unknown - CUSTOM BUILT: China