It supports FM (with RDS), LW, MW, and SW.
The MW/LW bands rely on a ferrite rod antenna, while FM and SW use the telescopic whip. High-end modifications often involve "supercharging" the unit with a longer 7.5-inch ferrite loopstick to dramatically improve weak-signal reception.
The radio is powered by a single 18650 lithium-ion battery . The charging circuit typically utilizes a dedicated chip near the USB-C or Micro-USB port to manage current and prevent overcharging. 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.
When examining a schematic, it is vital to know which version you own. Around 2023, XHDATA released a "New Version" (often identified by a USB-C port) with significant internal changes: It supports FM (with RDS), LW, MW, and SW
Some users have noted the removal of certain front-end filters in newer units, which can lead to increased FM breakthrough on the shortwave bands.
A central CPU manages the user interface, LCD, and keypad, while also communicating with the Si4735 over an I2C bus. The radio is powered by a single 18650 lithium-ion battery
The DSP architecture allows for selectable AM bandwidths (1.0, 1.8, 2.0, 2.5, 3.0, 4.0, and 6.0 kHz), which are crucial for rejecting interference on crowded bands. Detailed Circuit Breakdown