Message-ID: <5AE1F52D.6040304@posteo.de>
Date: Thu, 26 Apr 2018 17:50:05 +0200
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: VLF: carrier at 8270.003
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Hi Riccardo,

Your signal is well visible here on my grabber 
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html

Am 26.04.2018 13:04, schrieb Riccardo Zoli:
>
> Hi VLF,
>
> A new carrier test is running with about 610mA.
> Now, with last SL version, the PLL configuration made by Markus seems 
> to works well here, the phase is stable. I started this test yesterday 
> at about 10:00 UTC.
> I'm looking for an adequate conditional statement that permits to 
> inhibit the audio (and the TX) in case of an excess of antenna current 
> drop. Any suggestion?
Yes, sure, this is what i'm using all the time here.
First you need to calculate the antenna current from the signal level

I use: *s=1820*(10^((peak_a((sgf-10),(sgf+10)))/20)) *
s= antenna current in mA
sgf=transmit frequency (signal generator frequency)
1820 is just a calibration factor to calibrate the value to mA.
The If condition is 1, so it is executed on each FFT, which means each 
200 ms.
Then i define a traget current with the parameter d: d=600 (for example)
Next i define a current limit L, say 100 mA
Now if the actual current s drops L mA below the target value d, then 
another parameter e, which is a counter level, is increased.
After 200 ms the measurements are repeated and if the current is still 
to low, e is increased again.
Oh and there is another parameter c, which regulates the output amplitude.
If e exceeds a certain value (i choose 5), the c is set to 0, so the 
output amplitude becomes 0.

Actually the complete procedure is much more complex, i just described 
the safety function.
If you like, i can send you a usr file for TXing carriers and EbNaut...

73, Stefan

> My current VLF condx attached.
>
> All the best
>
>
> 73 de Riccardo IW4DXW
>
>
>
>

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Hi Riccardo, <br>
<br>
Your signal is well visible here on my grabber
<a class="moz-txt-link-freetext" href="http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html">http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html</a><br>
<br>
Am 26.04.2018 13:04, schrieb Riccardo Zoli:
<blockquote
 cite="mid:CANA3B6XBxfTFARn+j1mOMqz3Q4tou7cYDpJFaqTz+GOzHHhsdA@mail.gmail.com"
 type="cite">
  <div dir="ltr">
  <div dir="auto">
  <div dir="auto"><br>
  </div>
  <div dir="auto">Hi VLF,</div>
  <div dir="auto"><br>
  </div>
  <div dir="auto">A new carrier test is running with about 610mA.</div>
  <div dir="auto">Now, with last SL version, the PLL configuration made
by Markus seems to works well here, the phase is stable. I started this
test yesterday at about 10:00 UTC.</div>
  <div>I'm looking for an adequate conditional statement that permits
to inhibit the audio (and the TX) in case of an excess of antenna
current drop. Any suggestion?</div>
  </div>
  </div>
</blockquote>
Yes, sure, this is what i'm using all the time here.<br>
First you need to calculate the antenna current from the signal level<br>
<br>
I use: <b>s=1820*(10^((peak_a((sgf-10),(sgf+10)))/20)) </b><br>
s= antenna current in mA<br>
sgf=transmit frequency (signal generator frequency)<br>
1820 is just a calibration factor to calibrate the value to mA.<br>
The If condition is 1, so it is executed on each FFT, which means each
200 ms.<br>
Then i define a traget current with the parameter d: d=600 (for example)<br>
Next i define a current limit L, say 100 mA<br>
Now if the actual current s drops L mA below the target value d, then
another parameter e, which is a counter level, is increased.<br>
After 200 ms the measurements are repeated and if the current is still
to low, e is increased again. <br>
Oh and there is another parameter c, which regulates the output
amplitude.<br>
If e exceeds a certain value (i choose 5), the c is set to 0, so the
output amplitude becomes 0.<br>
<br>
Actually the complete procedure is much more complex, i just described
the safety function.<br>
If you like, i can send you a usr file for TXing carriers and EbNaut...<br>
<br>
73, Stefan<br>
<br>
<blockquote
 cite="mid:CANA3B6XBxfTFARn+j1mOMqz3Q4tou7cYDpJFaqTz+GOzHHhsdA@mail.gmail.com"
 type="cite">
  <div dir="ltr">
  <div dir="auto">
  <div>My current VLF condx attached.</div>
  <div><br>
  </div>
  <div>All the best</div>
  <div><br>
  </div>
  <div><br>
  </div>
  <div>73 de Riccardo IW4DXW</div>
  <div><br>
  </div>
  <div><br>
  </div>
  <div><br>
  </div>
  <div><br>
  </div>
  </div>
  </div>
</blockquote>
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