Message-ID: <4CD97E22.40609@iup.uni-heidelberg.de>
Date: Tue, 09 Nov 2010 18:00:18 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Re: BBB-4-like receiver ready for first tests
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Hi Daniele,

Hmm, consider Alans ideas too. Maybe he is right about the generator. I 
am wondering too, why the maximum gain is at 2 kHz.
Ehm, how does the Spectrum look if you connect the generator to the 
soundcard and try different loads? Is there a change, not just in the level?


Am 09.11.2010 17:36, schrieb Daniele Tincani:
> Hello Stefan, LF, VLF,
> now next questions: :-)
> 1) is the noise of the active antenna well below the typical band noise?
Try it out and watch the levels!
> 2) is the dynamic range large enough to manage the strongest hum 
> levels at my listening position?
Try it out. It depends on your local situation.

Here i am rather practical orientated. Nothing is easier than building 
up the antenna and hang it out of the window and see how the spectrum 
looks. Only here you will see if mains hum is an issue or not. If you 
change the location, say 4m up the house, the problems might be on the 
MSK side instead of the mains hum side. Maybe you can run your loop on 
one soundcard channel and the E field antenna on the other channel since 
you have a good stereo sound card. This makes it easy to compare the 
situation regarding mains hum and/or the diurnal noise level changes 
arround 9 kHz.

Not sure if my tomorrows transmission is useful for you but it may be 
worth a try to compare those both antennas. You are in the best position 
for this antenna (if it acts like a loop) although the distance is 
pretty high.

73, gl, Stefan/DK7FC


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Hi Daniele,<br>
<br>
Hmm, consider Alans ideas too. Maybe he is right about the generator. I
am wondering too, why the maximum gain is at 2 kHz.<br>
Ehm, how does the Spectrum look if you connect the generator to the
soundcard and try different loads? Is there a change, not just in the
level?<br>
<br>
<br>
Am 09.11.2010 17:36, schrieb Daniele Tincani:
<blockquote cite="mid:55010.75380.qm@web111919.mail.gq1.yahoo.com"   type="cite">
  <style type="text/css"><!-- DIV {margin:0px;} --></style>
  <div style="font-family: arial,helvetica,sans-serif; font-size: 10pt;">
  <div>Hello Stefan, LF, VLF,</div>
  <div>&nbsp;</div>
  <div>now next questions: :-)</div>
  <div>1) is the noise of the active antenna well below the typical
band noise?</div>
  </div>
</blockquote>
Try it out and watch the levels!<br>
<blockquote cite="mid:55010.75380.qm@web111919.mail.gq1.yahoo.com"   type="cite">
  <div style="font-family: arial,helvetica,sans-serif; font-size: 10pt;">
  <div>2) is the dynamic range large enough to manage&nbsp;the strongest&nbsp;hum
levels at my listening position?<br>
  </div>
  </div>
</blockquote>
Try it out. It depends on your local situation.<br>
<br>
Here i am rather practical orientated. Nothing is easier than building
up the antenna and hang it out of the window and see how the spectrum
looks. Only here you will see if mains hum is an issue or not. If you
change the location, say 4m up the house, the problems might be on the
MSK side instead of the mains hum side. Maybe you can run your loop on
one soundcard channel and the E field antenna on the other channel
since you have a good stereo sound card. This makes it easy to compare
the situation regarding mains hum and/or the diurnal noise level
changes arround 9 kHz. <br>
<br>
Not sure if my tomorrows transmission is useful for you but it may be
worth a try to compare those both antennas. You are in the best
position for this antenna (if it acts like a loop) although the
distance is pretty high.<br>
<br>
73, gl, Stefan/DK7FC<br>
<br>
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