Message-ID: <5BA3EEC3.1010509@posteo.de>
Date: Thu, 20 Sep 2018 21:02:27 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <7aad9ea4-dfbc-dfd4-3494-4643cdeb10d9@bigpond.com> <5B9C0ECF.6060402@posteo.de> <5B9FB6C7.8080607@posteo.de>
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Subject: Re: VLF: EbNaut 3 character attempt to VK7
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VLF,

In addition to the message below, which has been transmitted 3 times 
already, i will start to transmit the same message into a later time 
slot, also using different parameters:

*f = 17470.1000 Hz
Start time: 20.SEP.2018  19:30:00 UTC (daily)
Symbol period: 10 s
Characters: 3
CRC bits: 16
Coding 16K21A
Duration: 02:24 [hh:mm]
Antenna current: 1.2 A

*73, Stefan

Am 17.09.2018 16:14, schrieb DK7FC:
> Edgar, VLF,
>
> After evaluating the latest 4 days of carrier transmissions it shows 
> that the path from DL to VK7 is quite unstable, i.e. the phase is very 
> dynamic.  When applying different frequency offsets, it seems that the 
> best start time for a message attempt is 16:30 UTC these days. The SNR 
> then peaks when applying a -40 uHz offset, attached. Something between 
> 2...3 hours seems to be best. Currently 2 hours seem to give better 
> results but 3 hours would be less dynamic.
> Based on this data i'm trying:
>
> *f = 17470.1000 Hz
> Start time: 17.SEP.2018  16:30:00 UTC (daily)
> Symbol period: 10 s
> Characters: 3
> CRC bits: 19
> Coding 16K21A
> Duration: 02:32 [hh:mm]
> Antenna current: 1.2 A*
>
> 73, Stefan

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VLF, <br>
<br>
In addition to the message below, which has been transmitted 3 times
already, i will start to transmit the same message into a later time
slot, also using different parameters:<br>
<br>
<b>f = 17470.1000 Hz<br>
Start time: 20.SEP.2018  19:30:00 UTC (daily)<br>
Symbol period: 10 s<br>
Characters: 3<br>
CRC bits: 16<br>
Coding 16K21A<br>
Duration: 02:24 [hh:mm] <br>
Antenna current: 1.2 A<br>
<br>
</b>73, Stefan<br>
<br>
Am 17.09.2018 16:14, schrieb DK7FC:
<blockquote cite="mid:5B9FB6C7.8080607@posteo.de" type="cite">
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
Edgar, VLF, <br>
  <br>
After evaluating the latest 4 days of carrier transmissions it shows
that the path from DL to VK7 is quite unstable, i.e. the phase is very
dynamic.  When applying different frequency offsets, it seems that the
best start time for a message attempt is 16:30 UTC these days. The SNR
then peaks when applying a -40 uHz offset, attached. Something between
2...3 hours seems to be best. Currently 2 hours seem to give better
results but 3 hours would be less dynamic.<br>
Based on this data i'm trying:<br>
  <br>
  <b>f = 17470.1000 Hz<br>
Start time: 17.SEP.2018  16:30:00 UTC (daily)<br>
Symbol period: 10 s<br>
Characters: 3<br>
CRC bits: 19<br>
Coding 16K21A<br>
Duration: 02:32 [hh:mm] <br>
Antenna current: 1.2 A</b><br>
  <br>
73, Stefan<br>
</blockquote>
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