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Date: Sun, 04 Aug 2013 13:39:27 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: USA issued 68 to 76 kHz band with 10 W ERP
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Hi Markus,

Am 04.08.2013 09:46, schrieb Markus Vester:
> Stefan, 10 W ERP is not that hard - anyone who can radiate 80 W ERP on 
> 136 will be able to do 10 W on half the frequency ;-))
Oh yes indeed. The radiation resistance of the wire is about 1/4 and the 
needed L is about 4x, so the coil losses will be 4x higher too. The 
ground losses may drop a bit. Then it depends on the ratio of coil 
losses to ground losses. So 80W is realistic :-)

I don't know anything about LF propagation on that band. Is it much 
different to 2200m? And what are the distance records?

> Yesterday night a friend showed me his new GPS-stabilized 
> quadrocopter. It's stunning how it could just about be parked in 
> midair, despite some lateral winds. Seems that would make a great 
> antenna carrier! Not all of the neighbour's seemed to enjoy it as much 
> as we did...
MOST interesting! Did you ask him what the weight can be lifted? And 
will it still be stable then? Is it expensive? Do you fear some EMC 
problems? (The topic should be discussed in a new subject then)

73, Stefan/DK7FC

> Best 73,
> Markus (DF6NM)

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Hi Markus, <br>
<br>
Am 04.08.2013 09:46, schrieb Markus Vester:
<blockquote cite="mid:C38FD657ADC447C9A047E06D88A9A3AA@White"
 type="cite">
  <meta http-equiv="Content-Type"
 content="text/html; charset=ISO-8859-1">
  <meta content="MSHTML 6.00.6000.21342" name="GENERATOR">
  <div>&nbsp;</div>
  <div><font face="Arial" size="2">Stefan, 10 W ERP is not that hard -
anyone who can radiate 80 W ERP on 136 will be able to do 10 W&nbsp;on half
the frequency ;-))</font></div>
</blockquote>
Oh yes indeed. The radiation resistance of the wire is about 1/4 and
the needed L is about 4x, so the coil losses will be 4x higher too. The
ground losses may drop a bit. Then it depends on the ratio of coil
losses to ground losses. So 80W is realistic :-)<br>
<br>
I don't know anything about LF propagation on that band. Is it much
different to 2200m? And what are the distance records? <br>
<br>
<blockquote cite="mid:C38FD657ADC447C9A047E06D88A9A3AA@White"
 type="cite">
  <div><font face="Arial" size="2"> Yesterday night a friend&nbsp;showed
me&nbsp;his new GPS-stabilized quadrocopter. It's stunning how it&nbsp;could just
about be parked in midair, despite some lateral winds. Seems that would
make a great antenna carrier! Not all of the neighbour's&nbsp;seemed
to&nbsp;enjoy it&nbsp;as much as we did... </font></div>
</blockquote>
MOST interesting! Did you ask him what the weight can be lifted? And
will it still be stable then? Is it expensive? Do you fear some EMC
problems? (The topic should be discussed in a new subject then)<br>
<br>
73, Stefan/DK7FC<br>
<br>
<blockquote cite="mid:C38FD657ADC447C9A047E06D88A9A3AA@White"
 type="cite">
  <div>&nbsp;</div>
  <div><font face="Arial" size="2">Best 73,</font></div>
  <div><font face="Arial" size="2">Markus (DF6NM)</font></div>
</blockquote>
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