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Date: Wed, 21 Dec 2016 21:17:02 +0100
From: DK7FC <selberdenken@posteo.de>
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References: <158ddfd1f0b-5980-42e@webprd-a47.mail.aol.com> <584AC31C.20803@posteo.de> <584EAB0D.4060004@posteo.de>,<58555BA2.7050709@posteo.de> <1482320831911.81165@kuleuven.be>
In-Reply-To: <1482320831911.81165@kuleuven.be>
Subject: Re: LF: ULF experiment: A MEchanical Based Antenna
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Hi Rik,

Hmm, the subject should rather be "A mechanical based transmitter". That 
could be a funny game indeed, also the principle of distorting the 
signal with a saturating coil and then extracting harmonics...

The antenna is available, i just need to apply the low voltage to the 
RG58 cable in the shack. And 2970 Hz is not much. My overall antenna 
losses are, 680 Ohm coil loss, about 200 Ohm ground loss, some losses in 
the ferrite transformer and not to forget the 70 uOhm radiation 
resistance, so let's say roughly 1 kOhm. For 0.1 A i just need 10 W and 
this is managable. It is also possible to control the speed of a 
motor/generator into a PLL. Even PSK is possible...

Someone could do local tests in the lower ULF range. I will be there in 
some time too...

73, Stefan


Am 21.12.2016 12:47, schrieb Rik Strobbe:
>
> Hi Stefan,
>
>
> ever heard of a "A MEchanical Based Antenna​" ?
>
> Me neither until today ;-)
>
> Have a look at 
> https://www.fbo.gov/index?s=opportunity&mode=form&id=a7ad32588088d94cf6d66af19851b22e&tab=core&_cview=0 
> <https://www.fbo.gov/index?s=opportunity&mode=form&id=a7ad32588088d94cf6d66af19851b22e&tab=core&_cview=0> 
> ​ .
>
> Maybe you just need a couple of drones instead of a massove amount of 
> wire.
>
>
> 73, Rik  ON7YD - OR7T
>
>

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Hi Rik,<br>
<br>
Hmm, the subject should rather be "A mechanical based transmitter".
That could be a funny game indeed, also the principle of distorting the
signal with a saturating coil and then extracting harmonics...<br>
<br>
The antenna is available, i just need to apply the low voltage to the
RG58 cable in the shack. And 2970 Hz is not much. My overall antenna
losses are, 680 Ohm coil loss, about 200 Ohm ground loss, some losses
in the ferrite transformer and not to forget the 70 uOhm radiation
resistance, so let's say roughly 1 kOhm. For 0.1 A i just need 10 W and
this is managable. It is also possible to control the speed of a
motor/generator into a PLL. Even PSK is possible...<br>
<br>
Someone could do local tests in the lower ULF range. I will be there in
some time too...<br>
<br>
73, Stefan<br>
<br>
<br>
<br>
Am 21.12.2016 12:47, schrieb Rik Strobbe:
<blockquote cite="mid:1482320831911.81165@kuleuven.be" type="cite">
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <style type="text/css" style="display: none;"><!-- p { margin-top: 0px; margin-bottom: 0px; }--></style>
  <p>Hi Stefan,<br>
  </p>
  <p><br>
  </p>
  <p>ever heard of a "<span style="font-size: 10pt;">A MEchanical Based
Antenna</span><span style="font-size: 10pt;">​</span><span
 style="font-size: 10pt;">" ?</span></p>
  <p><span style="font-size: 10pt;">Me neither until today ;-)</span></p>
  <p><span style="font-size: 10pt;">Have a look at <a
 moz-do-not-send="true"
 href="https://www.fbo.gov/index?s=opportunity&amp;mode=form&amp;id=a7ad32588088d94cf6d66af19851b22e&amp;tab=core&amp;_cview=0">https://www.fbo.gov/index?s=opportunity&amp;mode=form&amp;id=a7ad32588088d94cf6d66af19851b22e&amp;tab=core&amp;_cview=0</a>​
.</span></p>
  <p><span style="font-size: 10pt;">Maybe you just need a couple of
drones instead of a massove amount of wire.</span></p>
  <p><span style="font-size: 10pt;"><br>
  </span></p>
  <p><span style="font-size: 10pt;">73, Rik  ON7YD - OR7T</span></p>
  <p><span style="font-size: 10pt;"><br>
  </span></p>
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