Message-ID: <586D6E99.6080509@posteo.de>
Date: Wed, 04 Jan 2017 22:52:25 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: VLF: Back on 5.17 kHz / 58 km...
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...unfortunately i made a mistake during a modification of the ALC 
regulator. Somehow the psk has stopped so the transmission failed :-(
I will repeat the transmission starting tomorrow 8 UTC...

73, Stefan

Am 04.01.2017 02:26, schrieb DK7FC:
> VLF,
>
> Today i spent several hours just for moving the resonance frequency 
> from 5.10 to 5.17 kHz. It shounds like an easy job but although i put 
> more iron powder cores into the coil, which rises the spacing between 
> the cups, which lowers the L, so it overcompensates the additional 
> cores, and it rises the Q, the resonance frequency rose to 5.4 kHz and 
> i didn't get it back. So i had to bring the whole arrangement down to 
> the lab. Later i managed to bring it accurately on 5.17 kHz and now 
> i'm back with 225 mA antenna current.
>
> I built an ALC into the conditional actions of SpecLab which hold to 
> the antenna current into a range between 224 and 226 mA. It seems to 
> work so far. Of course the tuning range is limited. We will see if the 
> current stays stable, at least during dry wx...
>
> So now it's time for a new transmission:
>
> *f = 5170.000000 Hz
> Start time: 04.Jan.2017   08:00:00 UTC
> Symbol length: 60 s
> Characters: 8
> CRC 16
> Coding 16K25A
> Duration: 12h, 26m, 40s
> Antenna current: ~ 225 mA*
>
> 73, Stefan

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...unfortunately i made a mistake during a modification of the ALC
regulator. Somehow the psk has stopped so the transmission failed :-(<br>
I will repeat the transmission starting tomorrow 8 UTC...<br>
<br>
73, Stefan<br>
<br>
Am 04.01.2017 02:26, schrieb DK7FC:
<blockquote cite="mid:586C4F2C.1010205@posteo.de" type="cite">
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
VLF, <br>
  <br>
Today i spent several hours just for moving the resonance frequency
from 5.10 to 5.17 kHz. It shounds like an easy job but although i put
more iron powder cores into the coil, which rises the spacing between
the cups, which lowers the L, so it overcompensates the additional
cores, and it rises the Q, the resonance frequency rose to 5.4 kHz and
i didn't get it back. So i had to bring the whole arrangement down to
the lab. Later i managed to bring it accurately on 5.17 kHz and now i'm
back with 225 mA antenna current.<br>
  <br>
I built an ALC into the conditional actions of SpecLab which hold to
the antenna current into a range between 224 and 226 mA. It seems to
work so far. Of course the tuning range is limited. We will see if the
current stays stable, at least during dry wx...<br>
  <br>
So now it's time for a new transmission:<br>
  <br>
  <big><b>f = 5170.000000 Hz<br>
Start time: 04.Jan.2017   08:00:00 UTC<br>
Symbol length: 60 s<br>
Characters: 8<br>
CRC 16<br>
Coding 16K25A<br>
Duration: 12h, 26m, 40s<br>
Antenna current: ~ 225 mA</b></big><br>
  <br>
73, Stefan<br>
</blockquote>
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