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Q: Heart Rate Monitor Frequency ( No Answer,   2 Comments )
Subject: Heart Rate Monitor Frequency
Category: Sports and Recreation
Asked by: matt12217-ga
List Price: $7.00
Posted: 18 Aug 2006 23:20 PDT
Expires: 17 Sep 2006 23:20 PDT
Question ID: 757554
What type of signal do heart rate monitors use to broadcast their
heart rate (data) to the watch?

What I am getting at, would be how would one intercept those signals
and read the data being broadcast? Is it a radio wave? If so what

**If anyone has a heart rate monitor, look on the box and see if it
says anything about the signal it uses.
There is no answer at this time.

Subject: Re: Heart Rate Monitor Frequency
From: stanmartin1952-ga on 19 Aug 2006 15:30 PDT
They don't seem to specify but here's one that uses FM:
Subject: Re: Heart Rate Monitor Frequency
From: room_101-ga on 01 Sep 2006 00:52 PDT
My girlfriend just bought one, and I know she paid extra for the
higher-end model, in large part, because it has some way to prevent
interference or confusion from other monitors.  A friend of hers
confirmed that this is a problem at the gym, where people use the
monitors in close proximity.  Given that, I am sure they can be
intercepted, at least most of them.  Best guess is that it uses RF and
you could pick up the signal with any frequency scanner; just look for
a steady pulsing signal in the range of 50 to 200 beats per minute.

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