• Country
• People's Republic of China

• Manufacturer / Brand
• Unknown - CUSTOM BUILT: China

• Year
• 2021 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 349504

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• DSP, Digital Signal Processor

• Wave bands
• Broadcast, more than 2 SW bands 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 4.5 cm = 1.8 inch

• Power out
• 3 W (unknown quality)

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: BAIJIALI 21 Band Radio Music Player BJL-166 KK-F266 - Unknown - CUSTOM BUILT: China

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 105 x 65 x 33 mm / 4.1 x 2.6 x 1.3 inch

• Notes

• The BAIJIALI BJL-166 pocket radio features FM/FML, MW, and SW bands, a sleep timer, and plays MP3 music files.

  Main features

  • FM1: 87.0 - 108.0 MHz (100 kHz steps)
  • FM2: 70 - 87 MHz (100 kHz steps)
  • MW: 522 - 1620 kHz (9 kHz steps)
  • SW: 3.9 - 22.2 MHz in 18 bands (5 kHz steps - see details below) 
    • SW1: 3.90 - 5.06 MHz
    • SW2: 5.06 - 6.10 MHz
    • SW3: 6.10 - 7.10 MHz
    • SW4: 7.10 - 8.10 MHz
    • SW5: 8.10 - 9.10 MHz
    • SW6: 9.1 - 10.1 MHz
    • SW7: 10.1 - 11.1 MHz
    • SW8: 11.1 - 12.1 MHz
    • SW9: 12.1 - 13.1 MHz
    • SW10: 13.1 - 14.1 MHz
    • SW11: 14.1 - 15.1 MHz
    • SW12: 15.1 - 16.1 MHz
    • SW13: 16.1 - 17.1 MHz
    • SW14: 17.1 - 18.1 MHz
    • SW15: 18.1 - 19.1 MHz
    • SW16: 19.1 - 20.1 MHz
    • SW17: 20.1 - 21.1 MHz
    • SW18: 21.1 - 22.2 MHz
  • Analog like tuning knob
  • Pure manual tuning with no memory presets
  • Audio output on the built-in speaker, without earphone socket
  • USB and TF ports to insert storage devices with MP3 audio files
  • Removable 18650 3.7V 2200 mAh Lithium Ion battery, charged via decated USB port.

  Brief technical details

  The PCB assembly reference is "KK-F266-MB-V2.2" "2021-12-15"

  The design is based around a BK1198 DSP Mechanical tuning AM/FM/SW radio Mono audio (SOP16 package version), by BEKEN. A basic RF front using one R25 NPN transistor and one A7 pair of diodes for ESD antenna protection, handles the SW and FM bands.

  The DSP IC shows the usual soft mute when jumping between frequency steps. The SW band uses 5 kHz steps, despite the display having only two decimal digits. While rotating the tuning knob, two soft-mute moments are registered for each 10 kHz second decimal digit. The tuning uses a rotary 100KR potentiometer coupled to a reduction gearbox with two gear wheels, enabling for a more precise tuning operation.

  A LTK5128D audio amplifier IC drives the built-in 45mm 2 Ohm 5W speaker.

  A custom  AH100QCL audio processor IC manages the radio and drives the LCD.

  The power supply uses some additional active components to handle the battery charging (very basic circuit of a 1R5 resistor and a SS4 diode), power regulation (422P / LN1154B332MR, LDO 3.3V), and switching (a A1SHB P-MOSFET to apply power to the MP3 ports; an undocumented MJE2B IC in series with the battery (-Batt) probably for protection).

• Net weight (2.2 lb = 1 kg)
• 0.2 kg / 0 lb 7 oz (0.441 lb)

• Mentioned in
• - - Manufacturers Literature

• Author
• Model page created by Jose Mesquita. See "Data change" for further contributors.

• Other Models

• Here you find 513 models, 492 with images and 24 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Unknown - CUSTOM BUILT: China