Richard Prosser wrote:
> Mike,
>
> Thanks, I hadn't realised that the data slicer averaged over such a
> short time interval. I'd assumed it was at least 8 to 10 bits and
> likely to be more.  Looks like I'd definately get an improvement if I
> went to manchester type encoding.
>
> Do you have a ref. for the Maxim app note?
>
> RP
Start here. There is a pdf also

http://www.maxim-ic.com/app-notes/index.mvp/id/3671


The averaging isn't over a number of bits.  It's the average of the 
waveform vs time constants of components. Without Manchester  encoding  
or without correct clock rate, it never works properly.

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