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Originally Posted by Mark McLeod
BTW you can also check to see if your beacon is emitting by pointing a digital video or still camera at it. Digital cameras can "see" the IR frequency used.
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Be careful with this method though, some cameras, especially new ones may not be able to see IR at all or as well as older digital cameras. They are now adding filtering that blocks some IR light from the CCD, so that it will not be displayed on the camera. I know that my older digital (HP850) sees IR much more strongly than my newer one (HP945). Also, any webcam should work fine, being cheap, it is not cost effective to add the filtering.
--Damian Manda