While the standard Si4735 chip does not natively support SSB, the "-D60" variant allows custom patches to be loaded into its RAM via the I2C bus. This patch enables upper sideband (USB) and lower sideband (LSB) demodulation with fine tuning down to 10 Hz. 2. The Microcontroller (MCU)

The heart of the XHDATA D808 is the Silicon Labs SI4735-D60 broadcast receiver IC. This tiny chip handles AM, FM, LW, SW, and SSB decoding.

A major factor in the "extra quality" reputation is the attention to stable power and component quality.

Total deafness on SW or FM, but the digital display and menus function perfectly.