Randy Kimball wrote:
> Do you have a cell phone.... now hang on...
> Cell phones check in with the tower systems every so often.  This is how
> they know if your phone is on line and to which tower to transmit to your
> cell phone. I'm no cell phone expert so my version of this is perhaps off
> just a little but I think this is the layman's version of what happens.  If
> your cell is on and in the area of .... well you get the rest... this is the
> daut daut daut..daut sound we hear in our car radios at times when the cell
> phone is near the radio receiver.  In my coach I hear it in my CB, too.
> 
> Could this be the mystery everyone is seeking?

Could be, but I am suspecting a heater switching on and off, every few 
seconds.  Printer fuser roll heater comes to mind.
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