At 05:05 PM 2004-01-22, Pete Smith wrote:
>I bet you will discover there is more than one, because both the trace and the
>recording suggested two devices with slightly different periods.
In December my wife purchased an electric mattress pad for our queen size bed.
It has two controls and, indeed, there are two pulse trains in my AM clock
radio by the bed when both sides are being heated. Turning off only my control
eliminates about half the noise in the clock radio.
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