Olin Lathrop wrote:
> Is this a commercial project?  If so we can probably help.  I wrote the 
> code
> for the heart rate receiver in the Tune (now Graber Products I think)
> PowerTap bicycle data logger.  The biggest problem is that there is a 
> lot of
> noise on the received signal.  Getting good noise immunity and decent
> response at the same time are not trivial.  In the end we got ours to work
> just a little better than the wristwatch receiver made by the same company
> (Polar?) that made the transmitter.

Hi Olin,

So now I have an inside source for my PowerTap! I find the heart monitor 
is reliable except when I ride near power lines or when the strap 
battery is low. It turns out that the 'Axiom' product line from 
Performance is compatible with PowerTap. So I have a wrist watch 
receiver that I can use in conjunction with the PowerTap 
handlebar-mounted receiver. The Axiom receiver works over a wider range. 
I suspect this may be due to either it being in slightly closer 
proximity or that my arm acts as a kind of e-field shield (or maybe it 
is just a product variation). When the Axiom fails, the heart rate 
reading pegs to some maximum, whereas the PowerTap drops to zero.

Oh and the Polar system is compatible too. I can pick up neighboring 
riders' heart rates by simply extending my arm towards them!

Scott
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