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Date: Tue, 31 Aug 2010 16:10:46 -0400
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From: Warren Ziegler <wd2xgj@gmail.com>
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Andy,

   Yes that is how environmentalists were able to block the Navy's use of
high-powered sonar based on the damage it did to whales and dolphins.
http://www.msnbc.msn.com/id/21785920/

<http://www.msnbc.msn.com/id/21785920/>
-- 
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1



On Tue, Aug 31, 2010 at 3:52 PM, Andy Talbot <andy.g4jnt@googlemail.com>wrote:

> But think of the animals and birds with their extended hearing range.
>
> Andy
> www.g4jnt.com
>
>
> On 31 August 2010 19:54, mal hamilton <g3kevmal@talktalk.net> wrote:
>
>>  I see 15 Kilowatt audio amplifiers advertised, therefore there must be a
>> speaker system, public address horns available for such amplifiers.
>> If one of these speaker horns was directed line of sight towards the
>> horizon or a mountain top and a suitable dish positioned at the receive end,
>> it must be possibel to intercept such a signal at audio frequencies. eg
>> Transmit a tone which could be keyed at 9 - 20 Kcs and see what distance
>> could be covered.
>> Keeping the signal just above the normal human audio range would
>> avoid interference.
>> or just TX a signal at say 5 Kcs and see how far it could be heard by ear
>> with this sort of power, maybe further than the same signal transmitted by
>> radio means, except one had an exceptionally large antenna
>> Maybe a NOV is required for this experiment!!!!
>> de g3kev
>>
>>
>>
>>
>>
>
>

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Andy,<div><br></div><div>=A0=A0 Yes that is how environmentalists were abl=
e to block the Navy&#39;s use of high-powered sonar based on the damage it=
 did to whales and dolphins.</div><div><a href=3D"http://www.msnbc.msn.com=
/id/21785920/">http://www.msnbc.msn.com/id/21785920/</a></div>
<div><br></div><div><a href=3D"http://www.msnbc.msn.com/id/21785920/"></a>=
<br>--=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">
<br></div><div class=3D"gmail_quote"><br></div><div class=3D"gmail_quote">=
On Tue, Aug 31, 2010 at 3:52 PM, Andy Talbot <span dir=3D"ltr">&lt;<a href=
=3D"mailto:andy.g4jnt@googlemail.com">andy.g4jnt@googlemail.com</a>&gt;</s=
pan> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex;"><div>But think of the animals and birds=
=A0with their extended hearing range.</div>
<div><br clear=3D"all">Andy<br><a href=3D"http://www.g4jnt.com" target=3D"=
_blank">www.g4jnt.com</a><br><br><br></div><div><div></div><div class=3D"h=
5">
<div class=3D"gmail_quote">On 31 August 2010 19:54, mal hamilton <span dir=
=3D"ltr">&lt;<a href=3D"mailto:g3kevmal@talktalk.net" target=3D"_blank">g3=
kevmal@talktalk.net</a>&gt;</span> wrote:<br>
<blockquote style=3D"border-left:#ccc 1px solid;margin:0px 0px 0px 0.8ex;p=
adding-left:1ex" class=3D"gmail_quote">
<div bgcolor=3D"#ffffff">
<div><font size=3D"2" face=3D"Arial">I see 15 Kilowatt audio amplifiers ad=
vertised, therefore there must be a speaker system, public address horns=
 available for such amplifiers. </font></div>
<div><font size=3D"2" face=3D"Arial">If one of these speaker horns was dir=
ected line of sight towards the horizon or a mountain top and a suitable=
 dish positioned at the receive end, it must be possibel to intercept such=
 a signal at audio frequencies. eg Transmit a tone which could be keyed=A0=
at 9=A0- 20=A0Kcs and see what distance could be covered.</font></div>


<div><font size=3D"2" face=3D"Arial">Keeping the signal just above the nor=
mal=A0human audio range would avoid=A0interference.</font></div>
<div><font size=3D"2" face=3D"Arial">or just TX a signal at say 5 Kcs and=
=A0see how far it could be heard=A0by ear with this sort of power, maybe=
 further than the same signal transmitted by radio means, except one had=
 an exceptionally large antenna</font></div>


<div><font size=3D"2" face=3D"Arial">Maybe a NOV is required for this expe=
riment!!!!</font></div>
<div><font size=3D"2" face=3D"Arial">de g3kev</font></div>
<div>=A0</div>
<div><font size=3D"2" face=3D"Arial"></font>=A0</div>
<div><font size=3D"2" face=3D"Arial"></font>=A0</div>
<div><font size=3D"2" face=3D"Arial">=A0=A0</font></div></div></blockquote=
></div><br>
</div></div></blockquote></div><br><br clear=3D"all"><br>=A0<br>
</div>

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