FW: RK05 question

Gooijen> Isn't the track index pulse == the one pulse that is fed to Gooijen> the PLL phase comparator? That pulse is used to synchronize Gooijen> the oscillator that must run at 12 (or 16) times the Gooijen> frequency between 2 sector pulses to generate the (missing) Gooijen> sector pulses .... or am I mistaken here? No, what I meant is to derive the 16x sector pulses from the 12x sector pulses, keeping the track pulse as it is. But either would be possible. The track slot is close to the first sector slot (it's not halfway between sectors). What I don't remember is how close, or whether the sector slot spacing around the track index is the same as elsewhere, or different. That would affect the PLL design a lot... To do this right would require measuring the angular positions of all the slots on a 12 sector and 16 sector pack, to see just what the pattern looks like and how to transform one to the other. paul