Message-ID: <5A8608B2.8070604@posteo.de>
Date: Thu, 15 Feb 2018 23:24:50 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <16190cf8b40-c90-b333@webjas-vab243.srv.aolmail.net> <5A8349C2.8010504@posteo.de> <5A856EA9.20506@posteo.de>
In-Reply-To: <5A856EA9.20506@posteo.de>
Subject: Re: VLF: sub-9-kHz TA E>W ?
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VLF,

No transmission tonite again. Something is not working with the PA :-/ I 
replaced a FET that died due to heat. Now the working point seems to 
cause a thermal drifting towards bad efficiency. The DC offset seems to 
be to high and there is no thermal feedback diode on the heat sink... 
I'll investigate...

73, Stefan

Am 15.02.2018 12:27, schrieb DK7FC:
> VLF,
>
> Last night (14th/15Th) my transmission failed. I still don't know the 
> reason but will check it later. I hope to be on air again this night...
>
> 73, Stefan
>
> Am 13.02.2018 21:25, schrieb DK7FC:
>> Thanks Markus,
>>
>> 29 dB S/N, quite a good result on your side :-)
>> From the tree i received the message with 0 symbol errors even.
>> I got the file from Jay. It looks we will need a long time :-) But 
>> tomorrow the tendency may be a bit more clear (even if not clear it 
>> will be clear :-) ). Let's hope the stacked file will show better 
>> than -10 dB tomorrow...
>>
>> 73, Stefan
>>
>> Am 13.02.2018 21:16, schrieb Markus Vester:
>>> Hi Stefan,
>>>
>>> excellent "local" decode from the cardioid in Amberg:
>>>
>>> list rank 0
>>> reference phase 180,180,180,180
>>> carrier S/N 29.02 dB in 39.1 uHz, -15.06 dB in 1Hz, -49.04 dB in 2.5kHz
>>> carrier Es/N0 -0.01 dB
>>> carrier Eb/N0 21.46 dB
>>> info bit period 4491.23 seconds
>>> symbol error rate 81/800 = 10.125 %
>>> Es/N0 from symbol errors -0.9 dB
>>> Eb/N0 from symbol errors 20.6 dB
>>> Shannon capacity 112.3 bits/hour
>>> Shannon efficiency 0.7 %
>>> symbols file 8k27W_02130025-symbols.csv
>>> elapsed 34 seconds
>>>
>>> Good luck to you and Jay, and anyone else who might want to take the 
>>> challenge.
>>>
>>> 73, Markus
>>>
>>>
>>>
>>> -----UrsprĂźngliche Mitteilung-----
>>> Von: DK7FC <selberdenken@posteo.de>
>>> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
>>> Verschickt: Di, 13. Feb 2018 0:01
>>> Betreff: Re: VLF: sub-9-kHz TA E>W ?
>>>
>>> VLF,
>>>
>>> OK, Jay responded to me personally. We will take the challenge.
>>>
>>> The first transmission is already running:
>>>
>>> *f = 8270.1000 Hz
>>> Start time: 12.FEB.2018  22:32:00 UTC (daily)
>>> Symbol period: 32 s
>>> Characters: 1
>>> CRC bits: 24
>>> Coding 16K21A
>>> Duration: 07:06:40 [hh:mm:ss]
>>> Antenna current: 700 mA*
>>>
>>> Reports welcome :-)
>>>
>>> 73, Stefan
>>>
>>>
>>>
>>> Am 12.02.2018 15:00, schrieb DK7FC:
>>>
>>>     Jay,
>>>
>>>     You are the one! The one on the other side of the pond who could
>>>     manage to get a decode of a message trasnmitted on 8270 Hz,
>>>     transatlantic east to west. This has not been done so far.
>>>
>>>     Are you interested and ready? You would need to run your PC for
>>>     a few days without restarting SpecLab or doing changes in that
>>>     SpecLab instance. You could provide the txt files so i can have
>>>     a look and see if the stacked Eb/N0 is building up, confirming
>>>     that it makes sense to continue to transmit.
>>>
>>>     I have no idea if this will work with my small signal.
>>>
>>>     Do we want to try? I would start transmitting this evening
>>>     already if you say GO!
>>>
>>>     73, Stefan
>>>

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VLF, <br>
<br>
No transmission tonite again. Something is not working with the PA :-/
I replaced a FET that died due to heat. Now the working point seems to
cause a thermal drifting towards bad efficiency. The DC offset seems to
be to high and there is no thermal feedback diode on the heat sink...
I'll investigate...<br>
<br>
73, Stefan<br>
<br>
Am 15.02.2018 12:27, schrieb DK7FC:
<blockquote cite="mid:5A856EA9.20506@posteo.de" type="cite">
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
VLF, <br>
  <br>
Last night (14th/15Th) my transmission failed. I still don't know the
reason but will check it later. I hope to be on air again this night...<br>
  <br>
73, Stefan<br>
  <br>
Am 13.02.2018 21:25, schrieb DK7FC:
  <blockquote cite="mid:5A8349C2.8010504@posteo.de" type="cite">
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
Thanks Markus, <br>
    <br>
29 dB S/N, quite a good result on your side :-)<br>
>From the tree i received the message with 0 symbol errors even.<br>
I got the file from Jay. It looks we will need a long time :-) But
tomorrow the tendency may be a bit more clear (even if not clear it
will be clear :-) ). Let's hope the stacked file will show better than
-10 dB tomorrow...<br>
    <br>
73, Stefan<br>
    <br>
Am 13.02.2018 21:16, schrieb Markus Vester:
    <blockquote
 cite="mid:16190cf8b40-c90-b333@webjas-vab243.srv.aolmail.net"
 type="cite">
      <div
 style="font-size: 10pt; font-family: arial,helvetica,sans-serif; color: black;">
      <div
 style="color: black; font-family: arial,helvetica,sans-serif; font-size: 10pt;"
 abp="2696">Hi Stefan,</div>
      <div
 style="color: black; font-family: arial,helvetica,sans-serif; font-size: 10pt;"
 abp="2696"><br>
excellent "local" decode from the cardioid in Amberg:</div>
      <div
 style="color: black; font-family: arial,helvetica,sans-serif; font-size: 10pt;"
 abp="2696"><br>
list rank 0<br>
reference phase 180,180,180,180<br>
carrier S/N 29.02 dB in 39.1 uHz, -15.06 dB in 1Hz, -49.04 dB in 2.5kHz<br>
carrier Es/N0 -0.01 dB<br>
carrier Eb/N0 21.46 dB<br>
info bit period 4491.23 seconds<br>
symbol error rate 81/800 = 10.125 %<br>
Es/N0 from symbol errors -0.9 dB<br>
Eb/N0 from symbol errors 20.6 dB<br>
Shannon capacity 112.3 bits/hour<br>
Shannon efficiency 0.7 %<br>
symbols file 8k27W_02130025-symbols.csv<br>
elapsed 34 seconds</div>
      <div
 style="color: black; font-family: arial,helvetica,sans-serif; font-size: 10pt;"
 abp="2696"><br>
Good luck to you and Jay, and anyone else who might want to take the
challenge.</div>
      <div
 style="color: black; font-family: arial,helvetica,sans-serif; font-size: 10pt;"
 abp="2696"><br>
73, Markus<br>
      <br abp="2697">
      <br abp="2698">
      <br abp="2699">
-----UrsprĂźngliche Mitteilung----- <br abp="2700">
Von: DK7FC <a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
 href="mailto:selberdenken@posteo.de">&lt;selberdenken@posteo.de&gt;</a><br
 abp="2701">
An: rsgb_lf_group <a moz-do-not-send="true"
 class="moz-txt-link-rfc2396E"
 href="mailto:rsgb_lf_group@blacksheep.org">&lt;rsgb_lf_group@blacksheep.org&gt;</a><br
 abp="2702">
Verschickt: Di, 13. Feb 2018 0:01<br abp="2703">
Betreff: Re: VLF: sub-9-kHz TA E&gt;W ?<br abp="2704">
      <br abp="2705">
      </div>
      <div id="AOLMsgPart_2_2f23681f-099e-4815-bd2e-af84f802c4e0"
 abp="2706">
      <div class="aolReplacedBody" abp="2707" text="#000000"
 bgcolor="#ffffff">VLF, <br abp="2708">
      <br abp="2709">
OK, Jay responded to me personally. We will take the challenge.<br
 abp="2710">
      <br abp="2711">
The first transmission is already running:<br abp="2712">
      <br abp="2713">
      <b abp="2714">f = 8270.1000 Hz<br abp="2715">
Start time: 12.FEB.2018Â  22:32:00 UTC (daily)<br abp="2716">
Symbol period: 32 s<br abp="2717">
Characters: 1<br abp="2718">
CRC bits: 24<br abp="2719">
Coding 16K21A<br abp="2720">
Duration: 07:06:40 [hh:mm:ss]<br abp="2721">
Antenna current: 700 mA</b><br abp="2722">
      <br abp="2723">
Reports welcome :-)<br abp="2724">
      <br abp="2725">
73, Stefan<br abp="2726">
      <br abp="2727">
      <br abp="2728">
      <br abp="2729">
Am 12.02.2018 15:00, schrieb DK7FC:
      <blockquote cite="about:blank" abp="2730">Jay, <br abp="2731">
        <br abp="2732">
You are the one! The one on the other side of the pond who could manage
to get a decode of a message trasnmitted on 8270 Hz, transatlantic east
to west. This has not been done so far. <br abp="2733">
        <br abp="2734">
Are you interested and ready? You would need to run your PC for a few
days without restarting SpecLab or doing changes in that SpecLab
instance. You could provide the txt files so i can have a look and see
if the stacked Eb/N0 is building up, confirming that it makes sense to
continue to transmit. <br abp="2735">
        <br abp="2736">
I have no idea if this will work with my small signal. <br abp="2737">
        <br abp="2738">
Do we want to try? I would start transmitting this evening already if
you say GO! <br abp="2739">
        <br abp="2740">
73, Stefan <br abp="2741">
        <br abp="2742">
      </blockquote>
      </div>
      </div>
      </div>
    </blockquote>
  </blockquote>
</blockquote>
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