Message-ID: <57F80D22.2020800@posteo.de>
Date: Fri, 07 Oct 2016 23:01:22 +0200
From: DK7FC <selberdenken@posteo.de>
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References: <154c32c4dba-373a-24653@webprd-m58.mail.aol.com> <573CAF79.9040701@abelian.org> <573CBBF0.4030701@posteo.de> <573E5907.6020107@posteo.de> <573EA094.3040205@abelian.org> <573EF90F.1080201@posteo.de> <573FC4DA.3080107@abelian.org> <5740842D.3030000@posteo.de> <5744FA27.6010703@posteo.de> <57F56531.3060205@posteo.de> <57F78A3F.5030803@posteo.de>
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Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
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Hi Paul,

It's the weekend and the antenna must be used for transmissions :-)
As long as there is no decode i'm starting another transmission, this 
time using 16K25A for the first time:

*f = 6470.00000 Hz
Start time: 07.10.2016   21:00:02 UTC
Symbol length: 80 s
Characters: 15
CRC 16
Coding _16K25A_
Duration: ?? Something arround 44 hours?*
*Antenna current: 270 mA (ish)
**
*My suggestion for a next version of the EbNaut Sender software: 
Displaying the duration of the transmission (depending on the mode and 
number of symbols). This can be an important information for TX stns.

73, GL, Stefan
*

*
Am 07.10.2016 13:42, schrieb DK7FC:
> ...transmission completed. Suddenly there was a lot of noise again 
> which makes a decode more unlikely :-( There average antenna current 
> was 270 mA.
>
> Any results, Paul?
>
> 73, Stefan
>
> Am 05.10.2016 22:40, schrieb DK7FC:
>> Hi Paul, VLF,
>>
>> Time to continue and complete that experiment: The goal is 20 
>> characters on 6.47 kHz.
>> I just re-built the system, the TX runs 260 mA on 6470 Hz.
>>
>> Now, the nexct attempt:
>>
>> *f = 6470.00000 Hz
>> Start time: 05.10.2016   21:00:02 UTC
>> Symbol length: 140 s
>> Characters: 15
>> CRC 16
>> Coding 8K19A
>> Duration: 38h, 34m, 40s*
>> *Antenna current: 250 mA (ish)*
>>
>> 73, Stefan
>>
>>
>> The last and best result so far:
>>>> Am 21.05.2016 04:15, schrieb Paul Nicholson:
>>>>> Stefan wrote:
>>>>>
>>>>> > f = 6470.00000 Hz
>>>>> > Start time: 20.05.2016   00:30:02 UTC
>>>>> > Symbol length: 100 s
>>>>> > Characters: 10
>>>>> > CRC 16
>>>>> > Coding 8K19A
>>>>>
>>>>> Copied 'THAT WORKS'
>>>>>
>>>>> Eb/N0 = +2.7 dB, constant reference phase
>>>>>
>>>>> Carrier: 19.25 dB in 13.3 uHz
>>>>>
>>>>> Error map: http://abelian.org/vlf/tmp/160520a.gif
>>>>>
>>>>> -- 
>>>>> Paul Nicholson
>>>>> -- 
>>>>>

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Hi Paul, <br>
<br>
It's the weekend and the antenna must be used for transmissions :-)<br>
As long as there is no decode i'm starting another transmission, this
time using 16K25A for the first time:<br>
<br>
<big><b>f = 6470.00000 Hz<br>
Start time: 07.10.2016   21:00:02 UTC<br>
Symbol length: 80 s<br>
Characters: 15<br>
CRC 16<br>
Coding <u>16K25A</u><br>
Duration: ?? Something arround 44 hours?</b></big><br>
<big><b>Antenna current: 270 mA (ish)<br>
</b><b><br>
</b></big>My suggestion for a next version of the EbNaut Sender
software: Displaying the duration of the transmission (depending on the
mode and number of symbols). This can be an important information for
TX stns.<br>
<br>
73, GL, Stefan<br>
<big><b><br>
<br>
</b></big><br>
Am 07.10.2016 13:42, schrieb DK7FC:
<blockquote cite="mid:57F78A3F.5030803@posteo.de" type="cite">
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
...transmission completed. Suddenly there was a lot of noise again
which makes a decode more unlikely :-( There average antenna current
was 270 mA.<br>
  <br>
Any results, Paul?<br>
  <br>
73, Stefan<br>
  <br>
Am 05.10.2016 22:40, schrieb DK7FC:
  <blockquote cite="mid:57F56531.3060205@posteo.de" type="cite">
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
Hi Paul, VLF, <br>
    <br>
Time to continue and complete that experiment: The goal is 20
characters on 6.47 kHz.<br>
I just re-built the system, the TX runs 260 mA on 6470 Hz.<br>
    <br>
Now, the nexct attempt:<br>
    <br>
    <big><b>f = 6470.00000 Hz<br>
Start time: 05.10.2016   21:00:02 UTC<br>
Symbol length: 140 s<br>
Characters: 15<br>
CRC 16<br>
Coding 8K19A<br>
Duration: 38h, 34m, 40s</b></big><br>
    <big><b>Antenna current: 250 mA (ish)</b></big><br>
    <br>
73, Stefan<br>
    <br>
    <br>
The last and best result so far:<br>
    <blockquote cite="mid:5744FA27.6010703@posteo.de" type="cite">
      <blockquote cite="mid:5740842D.3030000@posteo.de" type="cite">Am
21.05.2016 04:15, schrieb Paul Nicholson:
        <blockquote cite="mid:573FC4DA.3080107@abelian.org" type="cite">Stefan
wrote:


          <br>
          <br>
&gt; f = 6470.00000 Hz <br>
&gt; Start time: 20.05.2016   00:30:02 UTC <br>
&gt; Symbol length: 100 s <br>
&gt; Characters: 10 <br>
&gt; CRC 16 <br>
&gt; Coding 8K19A <br>
          <br>
Copied 'THAT WORKS' <br>
          <br>
Eb/N0 = +2.7 dB, constant reference phase <br>
          <br>
Carrier: 19.25 dB in 13.3 uHz <br>
          <br>
Error map: <a moz-do-not-send="true" class="moz-txt-link-freetext"
 href="http://abelian.org/vlf/tmp/160520a.gif">http://abelian.org/vlf/tmp/160520a.gif</a>
          <br>
          <br>
-- <br>
Paul Nicholson <br>
-- <br>
          <br>
        </blockquote>
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