Well, but
Most PC designs use phase lock techniques which keep external
signals way below the CPU operating frequency
There are legal limits for radiation; most laptops and all
PDA devices are "Class B" which is a pretty low level.
The real issue I suspect is that there is no practical way to test
what the effect of a whole planefull of "at-the-limit" devices do
to the plane's systems. It is very reasonable to design the avionics
to be hardened against this sort of thing, but the older planes wouldn't
have such avionics.
I expect we will see some lessening of the rules as the experience
and turnover of the airframes proceeds. We already have the
"mobile use okay until pushback" which is a real change.
Brian
> -----Original Message-----
> From: Harald Alvestrand [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, March 20, 2001 5:24 PM
> To: RL 'Bob' Morgan; [EMAIL PROTECTED]
> Subject: Re: presentation-prep as safety hazard
>
>
> At 19:11 19/03/2001 -0800, RL 'Bob' Morgan wrote:
>
> >On the plane last night, flying in to Minneapolis:
> >
> >"We're now starting our descent, please return your tray
> tables and seat
> >backs to their upright and locked position, and turn off any
> electronic
> >equipment."
> >
> >2 minutes later:
> >
> >"People! We really need you to turn those laptops off NOW ..."
>
> note that having a PC with a 500 MHz clock means that there is an
> oscillator in there running at some hundreds of megahertz,
> attached to a
> nest of wires of uncertain shape.
>
> this particular setup WILL transmit energy in the radio bands
> below 500 MHz.
>
> --
> Harald Tveit Alvestrand, [EMAIL PROTECTED]
> +47 41 44 29 94
> Personal email: [EMAIL PROTECTED]
>
> -
> This message was passed through [EMAIL PROTECTED], which
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> Decisions on what to pass are made solely by Harald Alvestrand.
>
