receiver operating range

The working range of the receiver is set by the software, and depends on which app is being used:

1. For ithlete HRV the operating range is quite short, typically 10-12" (250-300mm).  This is deliberate so we can get the strongest signal to measure the precise position of each heartbeat, and also so that the phone display is visible to allow the user to follow the lung animation.

2. For ithlete HRM the operating range is longer, typically 31-36" (800-1000mm).  This is typical for analog heart rate monitors that are sensitive to interference.  The HRM app has an automatic gain control system to minimise interference when the receiver is close to the body, but you will notice the signal drops out temporarily as you move the phone away from the body quickly.  It will re-establish after 2-3secs.

The range achieved does depend on the type & quality of the chest strap being used.  The Cardiosport model we supply as well as the Polar T31 models offer the best range we have seen.   We are working on a Garmin compatible ANT+ receiver that will allow the HRM to have a much longer range without interference becoming a problem.