John Smith wrote:
I have a high-power LED flashlight, 5 superbright leds in the element... it
is bright, if I bring it near an AM radios I lose all reception... this rfi
is solely the product of the leds, the connecting wires and the
batteries--the flashlight housing is aluminum...
I have never checked just how large a bandwidth the rfi covers...

The LEDs may be pulsed by something resembling a square
wave duty cycle thus generating a host of harmonics.
--
73, Cecil http://www.qsl.net/w5dxp

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