The XHDATA D-808 schematic reveals a sophisticated Digital Signal Processing (DSP)
Because an official diagram is hard to find, many users rely on community-driven resources for repairs or modifications: xhdata d-808 schematic
Unlike the other bands, the Air Band (118–137 MHz) often uses an analog front-end—typically a CD7358 IC for down-conversion to 10.7 MHz—which is then fed into the DSP. The XHDATA D-808 schematic reveals a sophisticated Digital
Join the Groups.io XHDATA-D808 list and ask politely. A member there has shared a partial PDF (power supply and audio stages) in the past. xhdata d-808 schematic
The whip antenna lead connects to the FM-SW circuitry, while MW/LW signals are primarily handled by the internal 3 7/8” ferrite rod antenna DSP Processing: