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With all the energy concentrated into a single tone
on 8.97 Kcs it could well travel a considerable distance with a few
Kilowatts of audio beamed in an arranged direction, especially along a
valley.
I am surprised that the high voltage 50 Hz
electricity overhead distribution network is not heard over great distances
by ear.
g3kev
----- Original Message -----
Sent: Wednesday, September 01, 2010 3:31
PM
Subject: Re: LF: VLF THOUGHT
Rik,
Krakatoa exploded with the equivalent force of 200 Megatons
of TNT, bigger than the largest Hydrogen bomb and 13,000 times the size of the
nuclear explosion that destroyed Hiroshima.
That said, I believe that what was hear at a distance was
still the low frequency rumble, 100Hz is attenuated at only 0.3dB/km while
10kHz is attenuated over 150dB/km.
Best to stick with EM waves as opposed to sound.
- 73 Warren K2ORS
WD2XGJ
WD2XSH/23
WE2XEB/2
WE2XGR/1
On Wed, Sep 1, 2010 at 3:58 AM, Rik Strobbe <[email protected]>
wrote:
All,
here
some real "DX":The explosion of the Krakatoa (1883) was heard in Perth
(Australia), 3100 km away, and on the island of Rodrigues, 5000 km
away.
73, Rik
ON7YD
________________________________________
Van: [email protected]
[[email protected]]
namens Klaus von der Heide [[email protected]]
Verzonden:
woensdag 1 september 2010 9:43
Aan: [email protected]
Onderwerp:
Re: LF: VLF THOUGHT
Hello All,
two years ago someone disturbed my
breakfast by a deeply
hammering disco sound. So I took my car to search
for
the source. Surprisingly, the sound decreased to nearly
zero when
I drove some kilometers in that direction where
the sound seem to come
from. The Odyssey took 45 minutes.
But finally I found the open-air disco
20 km from my home
in a lonely wood.
Indeed, the sound took nearly
60 seconds from there to my
home. That's more than a thunder usually
reaches.
More than thousand square-kilometers where
contaminated,
including 23 protected nature resevats.
Yes we can,
but Mankind should not do everything what it
can.
73!
Klaus,
DJ5HG
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