FM/MW/SW 3-Band radio TR103

Retekess Technology Co., Ltd.; Shenzhen

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  • Year
  • 2019 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 349683

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Transistors
  • 6
  • Semiconductors
  • Main principle
  • DSP, Digital Signal Processor
  • Wave bands
  • Broadcast, Short Wave plus FM or UHF.
  • Details
  • HD or solid state memory
  • Power type and voltage
  • Batteries / addl. power jack / Li-Ion 3.7 / USB 5 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 3.9 cm = 1.5 inch
  • Power out
  • 3 W (max.)
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: FM/MW/SW 3-Band radio TR103 - Retekess Technology Co., Ltd.;
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Dimensions (WHD)
  • 46 x 88 x 18 mm / 1.8 x 3.5 x 0.7 inch
  • Notes

  • The Retekess TR103 pocket radio features FM stereo (on earphones), MW, and SW bands. It plays MP3 audio files from the TF port.

    Main features

    • FM: 87 - 108 MHz, 64 - 108 MHz, selectable
    • MW: 520 - 1710 kHz (10 kHz steps), 522 - 1710 kHz (9 kHz steps), selectable
    • SW: 3.2 - 22.0 MHz
    • Manual and ATS tuning
    • 50 Memory presets
    • TF socket supports MP3/WMA audio files
    • 3.5mm stereo earphones jack
    • USB port to charge the built-in Li-Ion 600mAh battery

    Brief technical description

    The design is based around a Si4734-D60 DSP receiver IC (U2) managed by a FCMC639.1 custom audio and MCU processor IC (U1) with the help of a T24C08A 8Kbit EEPROM. The FM/SW RF front-end uses a J8 N-FET and some RLC networks.A A7 dual diodes protect the N-FET from ESD coming fro  the antenna. 

    The built-in speaker is driven by a 8002D single channel audio power amplifier IC (U5) configured in BTL mode. The external earphones are driven by a XPT4809 stereo headphones amplifier.

    The power supply includes a H3UF LDO regulator by MicrOne, a A5sHB (SI2305) P-MOSFET as a battery switch managed by the MCU. Four more J6 NPN transistors handle auxiliary controls.

  • Net weight (2.2 lb = 1 kg)
  • 0.073 kg / 0 lb 2.6 oz (0.161 lb)
  • Author
  • Model page created by Jose Mesquita. See "Data change" for further contributors.

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The model FM/MW/SW 3-Band radio is part of the collections of the following members.

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