I have a feeling that particular pll uses a reference divider of 640. They needed the 6.4005 for the RX mixer, but inside the PLL, that extra 500Hz translates to a 0.78Hz error (totally insignificant added up across 23 channels). From Night Rangers explanation being confirmed in other 01A radios, I am convinced the "datasheet" as seen on rixpix is completely wrong. Others have said the same thing on grumpy's forum.