Yeah, I've wondered what that would feel like, had my
first experience with 60 HZ when I was about 5.
Plugging in my clock radio, accidently touched both
prongs, though I didn't know at the time that you have
to touch both of them to get zapped, it scared me in
to being very carefull from then on. Remember how
weird it felt, like waves running from fingertips to
wrist.
Several years ago back in Arizona the group I was with
at field day used a military generator. They just
plugged in the Astron and 440 with out any converter.
Didn't hear any 400 HZ whine on the receiver at all.
Don't know if anybody heard it on the other end, if
they did they didn't say. Field day's such a noisy
environment most folks probably don't notice those
things anyway.
I read something a while back on a web-page with e l f
recordings in the a f range of whistlers and other
plasma wave phenomena, said that the noise from power
lines was much less in Europe than in the U.S. cuz
they have stricter standards there, and they make sure
things stay grounded. It also said you need to get at
least a mile from any lines to get good recordings in
that range with out that buzz.

--- Mike Freeman <[log in to unmask]> wrote:
> Yup.  Because filtering is easier at 400Hz, I think
> design engineers get
> a little sloppy when designing power supply DC
> filter circuitry.  You
> can sure hear it on airplane public address systems!
>
> Never got across 400Hz AC.  it must feel pretty
> weird to get vibrated
> that fast!
>
> Mike Freeman < K 7 U I J >
>
> On Thu, 13 Nov 2003 [log in to unmask] wrote:
>
> > Message-Id:
>
<20031113184200.WMDK17368.imf20aec.mail.bellsouth.net@[68.212.98.27]>
> >
> > Martin wrote:
> >    >As for why aircraft use 400 HZ, you are all
> right but there is
> >    >even one more reason.  While I don't know why
> the exact number of
> >    >400 Hertz, the biggest reason for using a
> higher frequency is the
> >    >size of inductors such as what you have in
> motors and transformers.
> > <snip>
> >    >I think that we'd get pretty tired of hearing
> that mosquito
> >    >whine everywhere very quickly.
> > I get my share of aeronautical mobiles check in
> with me when I'm ncs
> > for the Maritime mobile service net and you always
> hear a hint of that
> > 400 hz and its harmonics.
> >
> > Also note that on hf a lot of the aero comms sound
> like there's a
> > little rf feedback into the audio.  Harder to get
> a good ground up
> > there <grin>.
> >
> > 73 de nf5b
> >
> >
> >
> > Richard Webb
> >
> > Electric Spider Productions
> > "They that can give up essential liberty to obtain
> a little temporary
> > safety deserve neither liberty nor safety."
> >
> > --- Benjamin Franklin, NOvember 1755 from the
> > Historical review of Pennsylvania
> >
> >
> >
> >


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