Re: Things Kids Shouldn't Do at Home
On Fri, 3 Apr 2020 09:58:14 +0100 (BST)
"G.W. Haywood" <debian-bugs@jubileegroup.co.uk> wrote:
> Hi there,
>
> On Thu, 2 Apr 2020, Martin McCormick wrote:
>
> > My thanks to all those who theorise that it was this particular
> > drive's time to die. It is several years old and I was thinking
> > along the lines that the rest of you were thinking. One thing I
> > haven't done yet is to see if the clock crystal that drives the
> > internal usb controller is still active. I am not sure what
> > frequency it should free run on but one can sometimes hear the
> > clock on a general-coverage short wave radio receiver or
> > scanner-type receiver.
> >
> > What one hears is a signal that usually sounds like a
> > continuous carrier with no modulation. It's there when the drive
> > is powered up and goes away when the drive is disconnected.
> >
> >
> > Thanks.
> >
> > Martin
> > WB5AGZ
>
> Come on WB5AGZ, you know better than that. You can't hear a
> continuous carrier with no modulation. You can only hear the result
> of mixing it with something. :)
>
Yes, but if your receiver has any form of AGC, you should be able to
hear the background noise change when a significant carrier is being
received, or even just wideband junk at a level that forces its way
though the RF stage.
Not to mention the jitter in the frequency caused by program loops in
the processor with inadequate power smoothing... most modern
electronics puts out interference which can be heard as some sort of
clicking or buzzing.
--
Joe
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