• Country
• People's Republic of China

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

• Year
• 2024 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 356457

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

• Power type and voltage
• Dry Batteries / AA: 2 x 1.5 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 FM1-2/MW/SW 4 BANDS RADIO D-220 - Dongguan Xinhuaide Electronic

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

• Dimensions (WHD)
• 72 x 125 x 28 mm / 2.8 x 4.9 x 1.1 inch

• Notes

• The XHDATA D-220 pocket radio was released in three colors (yellow, green, black), features FM Mono, MW(AM), and SW bands. 

  Main specifications

  • FM1: 87 - 108 MHz
  • FM2: 64 - 108 MHz
  • MW: Frequency 520 - 1730 kHz (10 kHz steps) and 522 - 1728 kHz (9 kHz steps)
  • SW: 5.6 - 22-0 MHz
  • Earphone socket
  • Kickstand

  Brief technical details

  PCB assembly reference: D-220V1.1 20240510

  The radio uses an unmarked DSP chip (U2) but likely it is a  Si4825A10 DSP tuner, as it use the same pinout. The RF front-end uses two 2SC3356-R25 NPN RF transistors and dedicated BPFs, where (Q1) serves the SW and (Q2) serves the FM band. The MW magnetic antenna is connected passively to the DSP thru the mechanical band selector switch. 

  The telescopic antenna feeding the common input for the FM/SW RF front-ends is protected by a A7/BAV99 diode set (D1). Some initial production batches, despite using the same PCB revision, do not have this diode installed.

  A D2822M audio power amplifier (U1) drives the speaker.

  See the previous D-219 portable model that uses the same chipset, but featuring nine SW bandspreads.

• 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