> > That said, the newer ones are supposed to be ignored by the older
equipment
> > (wrong protocol, presumably).
> 
> I thought they both used the same 5kHz signal burst, but the older
> straps were simply dumb bursts with no data, while the newer bands
> encoded data (ASK?).
> 
> This allowed the old receivers to still 'see' the bursts from the
> newer straps, they would just ignore the data.  The newer receivers
> should still see the old bursts and report them as older style with no
> serial numbers.  So by and large the systems are stil compatible, but
> I don't recall where I got this information from and I could be
> mistaken...


I figured they were deliberately made incompatible so the newer coded ones
wouldn't interfere with the non-coded stuff.

>From my limited observations that seems to hold up, a lot of people make
equipment to pick up the signal, but they state it's for non-coded chest
straps only.  I've got a couple of coded straps, and they don't work.

Tony

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist