• Country
• People's Republic of China

• Manufacturer / Brand
• Dongguan Xinhuaide Electronic Commerce Co. (XHDATA); Dongguan

• Year
• 2022 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 349641

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

• Number of Transistors
• 5

• Semiconductors

• Main principle
• DSP, Digital Signal Processor

• Wave bands
• Broadcast, more than 2 SW bands plus FM or UHF.

• Power type and voltage
• Batteries / addl. power jack / AA: 2 x 1.5 / DC IN 5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 cm = 2 inch

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: XHDATA AM/FM/SW 11-Band World Receiver D-219 - Dongguan Xinhuaide Electronic

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

• Dimensions (WHD)
• 125 x 75 x 28 mm / 4.9 x 3 x 1.1 inch

• Notes

• The XHDATA D-219 radio features two FM bands, MW and nine SW bands and the audio output is mono delivered either to the internal speaker or to the earphones socket.

  There are two model variants, one using 9 kHz MW steps and another with 10 kHz AM steps, featuring different dial scale and corresponding DSP chip setup.

  Main features

  • Frequency coverage
    • FM: 64 - 108 MHz in two bands
      • FM1: 87 - 108 MHz
      • FM2: 64 - 87 MHz
    • MW (AM): Two model variants, check before buying.
      • 522 – 1620 kHz (9 kHz steps)
      • 520 – 1710 kHz (10 kHz steps) 
    • SW: 4.75 - 22.0 MHZ in nine bands
      • SW1: 4.75 - 5.06 MHz
      • SW2: 5.6 - 6.4  MHz
      • SW3: 6.8 - 7.6 MHz
      • SW4: 9.2 - 10.0 MHz
      • SW5: 11.45 - 12.25 MHz
      • SW6: 13.4 - 14.2 MHz
      • SW7: 15.0 - 15. MHz9
      • SW8: 17.1 - 18.0 MHz
      • SW9: 21.2 - 22.0 MHz
  • Analog like DSP tuner
  • Jog dial manual tuning
  • Power supply:
    • Two AA removable dry cells
    • DC IN jack for external 5V/300mA power adapter (Center pin Positive)

  Brief technical details

  The PCB reference is "D-219V1.1 20221023".

  The design is based around a Si4825-A10 mechanical tuning AM/FM/SW mono audio receiver IC (U2). A D2822M 2-channel audio power amplifier IC (U1) configured in bridge mode either drives the unmarked built-in speaker or else stereo earphones that will work in mono as well.

  While the MW(AM) signals are handled directly by the DSP chip, both FM and SW band signals are shaped by basic RF front-ends using active devices like a A7 (BAV99) antenna ESD protection diodes (D3), two R25 (2SC3356) NPN RF transistors (Q2 and Q5), and some RLC filter networks.

  The power supply design is simple. No regulators were included, either for the 3V from the dry cell batteries or for the external 5V DC IN jack. A single 470uF/10V large capacitor (C1) is connected in parallel with the supply line, close to U1.

  When using batteries, the positive lead (VCC+ line) connects to the power switch before reaching the +V line used by all active devices. The battery negative lead (VCC- line) is connected to the outer switched pin of the DC IN jack before reaching the ground plane (GND).

  When inserting an external power adapter plug into the DC IN jack, the battery negative lead is disconnected to prevent battery damage. The DC IN jack outer pin is grounded and it becomes the VCC- line. The DC IN jack center pin is connected to the battery positive lead (VCC+ line) thru a M7 (1N4007) series power diode (D4). Therefore if we apply 5VDC we may expect a voltage drop between 0.7V to 1.1V across D4 depending on the consumed current, resulting in an running voltage of around 4VDC average.

   

• Net weight (2.2 lb = 1 kg)
• 0.159 kg / 0 lb 5.6 oz (0.35 lb)

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

• Other Models

• Here you find 5 models, 5 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Dongguan Xinhuaide Electronic Commerce Co. (XHDATA); Dongguan