Schematic — Xhdata D-808
XHDATA D-808 Go to product viewer dialog for this item.
The is a highly-regarded portable DSP radio featuring Airband and SSB support. While a full official schematic is not publicly released by the manufacturer, detailed technical documentation and internal board comparisons are available through the enthusiast community. Technical & Version History
The D-808 has a brick-wall filter at 6 kHz. On the schematic, locate the audio output path between Si4735 pin 23 (OUT) and the headphone jack. There is a series capacitor (C49) and a resistor to ground (R56). Changing C49 from 0.1uF to 0.47uF opens up the treble, making shortwave sound less "muffled." xhdata d-808 schematic
3. The "SSB Twist": BFO and Architecture
Executive summary
Practical notes:
: It includes a 3.5mm external antenna jack for FM, SW, and Air bands, which is essential for improving reception with active or long-wire antennas Power Management XHDATA D-808 Go to product viewer dialog for this item
: USB-C port, amber/orange backlight, "Portable Digital Radio" on the manual cover. Technical & Version History The D-808 has a
In the "Golden Age" of electronics, manufacturers included schematics inside the box. It was expected that the user might want to tune the coils or replace a capacitor. Today, the D-808 is a black box.
Search for:
“Si4735 schematic portable radio” → this will match ~80% of the D-808’s signal path.
