I use a cardio sport and a Timex HRM (not at the same time I might add). Now sometimes I can run for well over an hour with no problems. Other times I am less than a mile down the road before I start getting loss of signal. These clear up (mostly) and the monitor reports correctly my heartrate again. However I then get the monitor losing signal two or three times every 10 minutes. How can it work well for an hour or more with no signal loss one day and other times be a complete waste of time? Any advice on positioning of belt, what to moisten the belt with...etc would be appreciated. Oh I tend to soak my belt in a sink for a minute or so before the run.
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Interference from overhead cables or other strong signals. This is the reason why HRM's don't work inside cars (at least my HRM doesn't work in my car, when the engine's switched on)
Contamination of chest strap contacts with vaseline, etc.
Strap too loose.
Chest too hairy causing poor connectivity.
The belt must be moistened with some sort of saline solution (spit or sweat!) otherwise you won't get an electrical circuit (ordinary water is not a good conductor)
Are the batteries beginning to run out?
There may be more reasons but these are all the ones I've experienced.
Hope that helps.
Loss of signal though is more likely to be a bad connection as Drew rightly says - and yes, spit works much better than tap water!