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Date: Wed, 1 Sep 2010 10:31:24 -0400
Message-ID: <AANLkTikieMQyYw9jK8fuxyznoBtknevc0Lm1-YaFJrB8@mail.gmail.com>
From: Warren Ziegler <wd2xgj@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: VLF THOUGHT
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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 <Rik.Strobbe@fys.kuleuven.be>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: owner-rsgb_lf_group@blacksheep.org [
> owner-rsgb_lf_group@blacksheep.org] namens Klaus von der Heide [
> v.d.heide@on-line.de]
> Verzonden: woensdag 1 september 2010 9:43
> Aan: rsgb_lf_group@blacksheep.org
> 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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Rik,<div><br></div><div>=A0=A0 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.</div><d=
iv>=A0</div>
<div>=A0=A0 That said, I believe that what was hear at a distance was stil=
l the low frequency rumble, 100Hz is attenuated at only 0.3dB/km while 10k=
Hz is attenuated over 150dB/km.</div><div><br></div><div>Best to stick wit=
h EM waves as opposed to sound.</div>
<div><br></div><div>-=A0<br>73 Warren K2ORS<br>=A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 WD2XGJ=A0<br>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XSH/23<br>=A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 WE2XEB/2<br>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WE2XGR/1<=
br><br><div class=3D"gmail_quote">On Wed, Sep 1, 2010 at 3:58 AM, Rik Stro=
bbe <span dir=3D"ltr">&lt;<a href=3D"mailto:Rik.Strobbe@fys.kuleuven.be">R=
ik.Strobbe@fys.kuleuven.be</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex;">All,<br>
<br>
here some real &quot;DX&quot;:The explosion of the Krakatoa (1883) was hea=
rd in Perth =A0(Australia), 3100 km away, and on the island of Rodrigues,=
 5000 km away.<br>
<br>
73, Rik =A0ON7YD<br>
________________________________________<br>
Van: <a href=3D"mailto:owner-rsgb_lf_group@blacksheep.org">owner-rsgb_lf_g=
roup@blacksheep.org</a> [<a href=3D"mailto:owner-rsgb_lf_group@blacksheep.=
org">owner-rsgb_lf_group@blacksheep.org</a>] namens Klaus von der Heide [<=
a href=3D"mailto:v.d.heide@on-line.de">v.d.heide@on-line.de</a>]<br>

Verzonden: woensdag 1 september 2010 9:43<br>
Aan: <a href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksh=
eep.org</a><br>
Onderwerp: Re: LF: VLF THOUGHT<br>
<div><div></div><div class=3D"h5"><br>
Hello All,<br>
<br>
<br>
two years ago someone disturbed my breakfast by a deeply<br>
hammering disco sound. So I took my car to search for<br>
the source. Surprisingly, the sound decreased to nearly<br>
zero when I drove some kilometers in that direction where<br>
the sound seem to come from. The Odyssey took 45 minutes.<br>
But finally I found the open-air disco 20 km from my home<br>
in a lonely wood.<br>
<br>
Indeed, the sound took nearly 60 seconds from there to my<br>
home. That&#39;s more than a thunder usually reaches.<br>
<br>
More than thousand square-kilometers where contaminated,<br>
including 23 protected nature resevats.<br>
<br>
Yes we can, but Mankind should not do everything what it can.<br>
<br>
<br>
73!<br>
<br>
Klaus, DJ5HG<br>
</div></div></blockquote></div><br><br clear=3D"all"><br>-<br>=A0<br>
</div>

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