Xhdata D808 Schematic Extra Quality Upd -

: A popular mod involves adding a 27 pF capacitor to the back of the PCB at position C10 to enable better performance with an external mediumwave antenna .

: The RF circuit boards between these variants are completely different. The original design featured adjustable potentiometers (pots) for fine-tuning, whereas the newer models rely more heavily on fixed-value components to save on costs and assembly time. xhdata d808 schematic extra quality

Recent teardowns have revealed significant changes between the "Original" (pre-2021) and "New" versions of the D-808. : A popular mod involves adding a 27

: For the ultimate AM-DX experience, some users replace the internal 3-inch ferrite rod with a custom 7.5-inch loopstick . 4. Technical Specifications Summary Technical Specifications Summary : The Air Band (118–137

: The Air Band (118–137 MHz) is handled by a dedicated analog front-end consisting of a CD7358 IC and an FS8308 IC for PLL down-conversion to 10.7MHz, which is then fed into the DSP chip for final processing. 2. Original vs. New Version: Circuit Quality Comparison

: Some "barefoot" DXers (those using only the internal antenna) have noted that the audio amplifier in the newer versions is less effective at amplifying extremely weak AM-DX signals compared to the original high-quality model. 3. "Extra Quality" Modifications and Repair Tips

The "brain" of the D-808 is the DSP chip. This high-performance receiver IC handles the majority of the radio's functions across FM, LW, MW, and SW bands.