UH400. UH400a, UH400TM v6.3

Replaced subsonic filter with a quieter one, for a slight improvement in noise performance. For late model UH400A or UH400TM (late 2005 and newer) using National PLL and 11.2896 MHz crystal.


UH400. UH400a, UH400TM v5.3

Same as v6.3, but for older models with Philips PLL and 11.2896 MHz crystal.

UH400. UH400a, UH400TM v4.3

Same as v6.3, but for older models with National PLL and 11.3000 MHz crystal.

UH400. UH400a, UH400TM v3.5

Same as v6.3, but for older models with Philips PLL and 11.3000 MHz crystal.

UH400. UH400a, UH400TM v6.2

Slowed down LED blinks for PLL unlock indicator, for easier factory alignment. No user apparent changes were made. For late model UH400A (late 2005 and newer) using National PLL and 11.2896 MHz crystal.