I'll give it a try tomorrow.

Thanks,
Les

> 
> Well if the extra filtering of the TTL inputs helps, I would do the trick 
> with 
> raw-write to setup the filter time constant (the QFilterRate register at 
> 0x3400). Currently the filter frequency is 33 MHZ which gives a 450 ns time 
> constant: good for encoder count rates up to ~4 MHz, if the filter was set to 
> divide by 8 (loaded with 6) you could still count up to 500 KHz but reject 
> pulses up to 4 uSec long. You can divide the 33 MHz by up to 2049 (which 
> _will_ be too slow, limiting your count rate to ~2KHz (filter on) or 10KHz 
> (filter off)
> 


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