> I'm thinking of building a receiver for these wireless chest-belt
> transmitters. As far as I know they transmit on frequencies around 5 
> kHz.
> Has anyone already build such a receiver ?  What about the maximum
> distance between transmitter + receiver ?


There are a number of circuits on the web.
Google knows where they are.
email me if you don't find anything - too busy just now.

Range is typically 1 metre easily.
2 metres gets rather hard.


        RM 

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