Re: Cockpit noise ?

Mike, just done a 400Hz tone in Cool Edit 2000, it is EXACTLY that noise
!!!!!


Cheers
Andy




"Andy100" <andy100@xxxxxxx> wrote in message
news:dg9knb$90a$1@xxxxxxxxxxxxxxxxxxxxxx
> Well i think that clears it up then. I think you are probably right Mike.
> Does sound like some kind of electrical interference as opposed to
engines.
> I think i have even heard it before engine start, so that leads me to
think
> what you say is probably the likely source !
>
> Cheers
> Andrew
>
>
>
> "Mike Granby" <mikeg@xxxxxxxxx> wrote in message
> news:1126697147.090064.320490@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >
> > A lot of the avionics on jets are powered from an alternating current
> > supply that which 400 times a second, rather than the direct current
> > supply used on smaller aircraft. I suspect that what you hear is the
> > 400Hz tone leaking from this supply. I've heard it myself on jet radio
> > taffic, and it seems about the right frequency.
> >
>
>


.

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