FM (64–108 MHz), LW (150–450 kHz), MW (520–1710 kHz), SW (1.7–30 MHz), AIR (118–137 MHz) Tuning Steps SSB minimum step is ; independent USB/LSB reception Power Source 18650 Li-ion battery , rechargeable via USB 500 stations across 50 pages Special Features
A canonical “extra quality schematic” for the XHDATA D808 does not exist publicly. The closest alternatives are high-resolution PCB scans and component-level partial traces. For repair or modification, the Si4735 datasheet plus the traced front-end and audio circuits cover >90% of the radio’s functionality. Researchers are encouraged to contribute to an open collaborative schematic on GitHub.
The D-808 is known for excellent sensitivity and selectivity across FM, LW, MW, SW, and AIR bands. Its performance is largely driven by its architecture. 1. Key Components of the D-808 Schematic
When following a schematic, you must identify your specific version, as the internal layouts differ significantly:
Visually inspect the input circuit for burn marks. Check continuity across the input protection diodes; if shorted, replace them. xhdata d808 schematic extra quality
To remove high-frequency digital hiss.
The best place to start is often the manufacturer's website or contacting the manufacturer directly. They may provide schematics, user manuals, or technical support for their products.
: Easy to identify by the USB-C port and rubber tabs on the bottom. Critics note that many front-end filtering components were removed in this version, which can lead to FM breakthrough issues.
When we say "extra quality," we mean:
The XHDATA D-808 is a highly regarded portable radio among shortwave listeners and DXing enthusiasts. It offers excellent performance across FM, AM, LW, MW, and SW bands, along with Single Sideband (SSB) capabilities.
: Unlike traditional analog radios, the Si4735 processes signals digitally, allowing for the D-808's highly selective bandwidth settings (ranging from 6kHz down to 500Hz for SSB).
When plugged into USB, the D808 whines on low frequencies. The schematic reveals the USB 5V rail connects via L2 (ferrite bead).
Note that there are "Original" and "New" versions of the D-808. The newer version (identifiable by rubber feet on the bottom and a USB-C port) has a completely different RF circuit board FM (64–108 MHz), LW (150–450 kHz), MW (520–1710
Mod 3: Enhanced ESD Protection for the External Antenna Jack
A user named "Bert" (Netherlands) reverse-engineered the D808 in 2021. He produced a (the definition of extra quality). You can zoom in to 800% and the lines remain sharp.
To help me find or reconstruct the specific diagram details you need, are you looking to trace a specific (like no sound or power issues), or are you planning a hardware modification ? Share public link
Let me know if you would like me to find the for the filters or if you want to explore the differences in user experience between the two versions. Researchers are encouraged to contribute to an open
The original D-808, often considered higher quality, featured a densely packed circuit board.