Message-ID: <4BCD5D66.4090001@iup.uni-heidelberg.de>
Date: Tue, 20 Apr 2010 09:53:10 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Dreamers Band update from W1VLF
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Hi Paul, VLF,

Am 17.04.2010 17:58, schrieb Paul A. Cianciolo:
> I wonder if you can point me to the schematic of your final amplifier?
> It would be nice to learn from amplifier building experience.

Yes, sure. But i want to wait until the new PA has passed it's first 
experiment, working on the antenna, not on a 300W halogen lamp ;-)
> What is your over all system impedance impedance?
> I see the coil is 283 ohms
Currently i get about 580mA at 300W, so the loss resistance is about 900 
Ohm. But due to the high Z and kite movement, these parameters are 
changing quickly, so it is difficult to measure exact values. Here, the 
new analog amperemeter will help! It is installed and calibrated but 
still not yet tested in the field...

> Also do you ground radials, and flat aluminum show you an antenna 
> current difference?

No, the ground radial (both sides insulated aluminium foil) makes no 
benefit. The copper plate is best. So, a capacitive coupling to ground 
seems to be rather difficult. Therefore, i am hopefully that the my 
copper ground rod that i have driven into the earth on the last 
experiment will cause a significant loss resistance decrease. But this 
is also not testes yet ;-)



GL es 73!

Stefan/DK7FC



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Hi Paul, VLF,<br>
<br>
Am 17.04.2010 17:58, schrieb Paul A. Cianciolo:
<blockquote cite="mid:MFEJIKCLCMPDFHOKMANAOEKOOGAA.paulc@snet.net"   type="cite">
  <meta http-equiv="Content-Type"   content="text/html; charset=ISO-8859-1">
  <style></style>
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  <style id="owaTempEditStyle"></style>
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  <div><span class="328404915-17042010"><font color="#0000ff" size="2">I
wonder if you can point me to the schematic of your final amplifier?</font></span></div>
  <div><span class="328404915-17042010"><font color="#0000ff" size="2">It
would be nice to learn from amplifier building experience.</font></span></div>
  <div><span class="328404915-17042010"></span></div>
</blockquote>
<br>
Yes, sure. But i want to wait until the new PA has passed it's first
experiment, working on the antenna, not on a 300W halogen lamp ;-)<br>
<blockquote cite="mid:MFEJIKCLCMPDFHOKMANAOEKOOGAA.paulc@snet.net"   type="cite">
  <div>&nbsp;</div>
  <div><span class="328404915-17042010"><font color="#0000ff" size="2">What
is your over all system impedance impedance?</font></span></div>
  <div><span class="328404915-17042010"><font color="#0000ff" size="2">I
see the coil is 283 ohms</font></span></div>
</blockquote>
Currently i get about 580mA at 300W, so the loss resistance is about
900 Ohm. But due to the high Z and kite movement, these parameters are
changing quickly, so it is difficult to measure exact values. Here, the
new analog amperemeter will help! It is installed and calibrated but
still not yet tested in the field...<br>
<br>
<blockquote cite="mid:MFEJIKCLCMPDFHOKMANAOEKOOGAA.paulc@snet.net"   type="cite">
  <div><span class="328404915-17042010"></span>&nbsp;</div>
  <div><span class="328404915-17042010"><font color="#0000ff" size="2">Also
do you ground radials, and flat aluminum show you an antenna current
difference?</font></span></div>
</blockquote>
<br>
No, the ground radial (both sides insulated aluminium foil) makes no
benefit. The copper plate is best. So, a capacitive coupling to ground
seems to be rather difficult. Therefore, i am hopefully that the my
copper ground rod that i have driven into the earth on the last
experiment will cause a significant loss resistance decrease. But this
is also not testes yet ;-)<br>
<br>
<br>
<br>
GL es 73!<br>
<br>
Stefan/DK7FC<br>
<br>
<br>
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