[bookport] Re: Different electrical behavior when Bookport is sleeping between beta and stable firmware
- From: Will Smith <wilsmith@xxxxxxxxx>
- To: bookport@xxxxxxxxxxxxx
- Date: Wed, 30 Mar 2005 23:04:24 -0500 (EST)
Great detective work. Likewise you can often tell a lot by putting a unit
like the Book Port near a sensitive AM radio tuned to the low end of the
dial.
I suggest several of us might wish to try this too, preferably during the
daylight hours and on an unused frequency.
Will
wilsmith@xxxxxxxxx
On Wed, 30 Mar 2005, Joseph
Norton wrote:
> Hi APH staff and listers:
>
> Well, all this talk about battery drainage made me think of an experiment
> which has yielded helpful data in the past and may even now.
>
> I decided to get out my trusty telephone pick-up coil which I normally
> have stuck on the back of my computer to clue me in to what my computer
> may be doing behind my back. I got it out and placed it onto my Bookport
> and noticed a difference in the electromagnetic noise generated by the
> Bookport when it's supposed to be asleep. With the latest firmware, all I
> hear is a kind-of hiss when the Bookport is supposed to be powered
> off--the same noise is also heard when plugged into the USB connection
> except when files are being transfered which generates some noise also.
> Anyway, I got to wondering if this was the same noise heard with the
> stable 1.20 firmware when the unit is powered off. So, I reverted back to
> 1.20 and noticed there was a change in the interference when the Bookport
> is supposed to be asleep. With 1.20, the noise picked up by my pick-up
> coil is a kind-of buzzing sound which varies in pitch from slightly higher
> to lower every half-second. Kind-of like a siren, but, much lower. I
> went back to 1.20.22 and found that with 1.20.22 beta, the buzzing noise
> is gone--there's just a soft hissing noise when the unit is asleep. This
> sounds much quieter than the noise I got from 1.20 stable, but, it does
> seem to be different behavior, for whatever that's worth.
>
> You all may think I'm nuts, but, that pick-up coil has clued me into a lot
> of things over the years, so I am tossing my observations out there.
>
> Hope this helps.
>
>
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