Russell,
can you use FSK with a zero-crossing-detector on the receiver side 
[measuring pulse width to determine frequency]

Russell McMahon wrote:

> 5.    ???
> 
> Method 1. or 2. may well work well enough to be used for non critical 
> applications over moderate ranges. I can see this being attractive for 
> hobby robot type use.
> 
> Thoughts?

-- 
Martin K
http://wwia.org/sgroup/biofuel/
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