Message-ID: <58E637C9.8080506@posteo.de>
Date: Thu, 06 Apr 2017 14:42:49 +0200
From: DK7FC <selberdenken@posteo.de>
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References: <579355A36AEE9D4FA555C45D556003AB8FDC3657@servigilant.vigilant.local> <58E3F762.1030007@posteo.de> <58E4F1B1.6070204@posteo.de> <1491407599.145519160@f148.i.mail.ru>
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Subject: Re: VLF: Carrier on 8270.005 Hz
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Hello Alex,

Thank you for the capture! About 15 dB in 47 uHz, so we still can 
transfer EbNaut messages, 5 characters should be no problem :-) I would 
like to test it again but there are really many things to try. The last 
2 days were pure carriers for RC4HAA. There are some bright pixels near 
the right frequency to the right time. But as long as there is no 
accurate reference signal, it is only guesswork, no clear ID of my 
signal. So we can try more EbNaut soon and i like to try to come back to 
6.47 kHz with a stronger signal. And then there is the new 970 Hz 
playing field and the 2970 Hz coil must be repaired. So far running 5 kV 
at 970 Hz with the transformer. I have a 2 nF fixed capacitor that holds 
40 kV. When using the repaired coil for 2970 together with the antenna 
and this capacitor and some (many!) iron powder cores inside the coil i 
could come down to 970 Hz when running 300 mA into the coil. And then i 
will get 60 mA antenna current at 970 Hz, a signal improvement of 12 dB. 
I expect to manage at least 30 km in 424 uHz then, who knows, maybe more...
Just some thoughts about the low frequency stuff :-)

73, Stefan

Am 05.04.2017 17:53, schrieb rn3aus@gmail.com:
> Hello Stefan, VLF!
> Trace on my vlf-grabber in ko85ha in 47 and 21 uHz.
>
>     ĐĄŃĐľĐ´Đ°, 5 Đ°ĐżŃĐľĐťŃ 2017, 16:34 +03:00 ĐžŃ DK7FC <selberdenken@posteo.de>:
>
>     VLF,
>
>     There is a trace very close to 8270.005 Hz on the 47 uHz
>     spectrogramm of the RC4HAA VLF grabber, *http://136.su/grabber/*
>     This is a land path distance of *2877 km*,
>     http://no.nonsense.ee/qth/map.html?qth=LO53CF34HC&from=jn49ik00wd
>     <http://no.nonsense.ee/qth/map.html?qth=LO53CF34HC&from=jn49ik00wd>
>
>
>
>     Actually the trace appears to be one pixel to high in frequency
>     and it looked to me that it has started a bit earlier than my
>     transmission. So i expect it is not my signal but some local
>     noise. But meanwhile it stays on the QRG quite stable. My carrier
>     is still on the air since yesterday 18:50 UTC.
>
>     So, i'll do QSY after 24 hours, at 18:50 UTC the carrier will jump
>     to 8270.000 Hz. Then after some hours we will see what happens! :-)
>
>     73, Stefan
>
>     Am 04.04.2017 21:43, schrieb DK7FC:
>>     Hi all,
>>
>>     ...running 700 mA again since 18:50 UTC. I am testing my new PVC
>>     coil housing. It protects the coil from rain and sunlight.
>>     Fortunately it is already proved that there are no dielectrical
>>     disadvantages (same resonance and Q of the coil). But the open
>>     question is how the coil will heat up inside the housing. So this
>>     transmission is a test again. But the current amplitude is
>>     constant at 700 mA, the phase is stable anyway. So it may be
>>     useful for some OMs testing their receivers...
>>     It will be on air long enough to see something in 47 uHz...
>>
>>     73, Stefan
>>
>

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Hello Alex, <br>
<br>
Thank you for the capture! About 15 dB in 47 uHz, so we still can
transfer EbNaut messages, 5 characters should be no problem :-) I would
like to test it again but there are really many things to try. The last
2 days were pure carriers for RC4HAA. There are some bright pixels near
the right frequency to the right time. But as long as there is no
accurate reference signal, it is only guesswork, no clear ID of my
signal. So we can try more EbNaut soon and i like to try to come back
to 6.47 kHz with a stronger signal. And then there is the new 970 Hz
playing field and the 2970 Hz coil must be repaired. So far running 5
kV at 970 Hz with the transformer. I have a 2 nF fixed capacitor that
holds 40 kV. When using the repaired coil for 2970 together with the
antenna and this capacitor and some (many!) iron powder cores inside
the coil i could come down to 970 Hz when running 300 mA into the coil.
And then i will get 60 mA antenna current at 970 Hz, a signal
improvement of 12 dB. I expect to manage at least 30 km in 424 uHz
then, who knows, maybe more...<br>
Just some thoughts about the low frequency stuff :-)<br>
<br>
73, Stefan<br>
<br>
Am 05.04.2017 17:53, schrieb <a class="moz-txt-link-abbreviated" href="mailto:rn3aus@gmail.com:">rn3aus@gmail.com:</a>
<blockquote cite="mid:1491407599.145519160@f148.i.mail.ru" type="cite">Hello
Stefan, VLF!<br>
Trace on my vlf-grabber in ko85ha in 47 and 21 uHz.<br>
  <br>
  <blockquote
 style="border-left: 1px solid rgb(8, 87, 166); margin: 10px; padding: 0pt 0pt 0pt 10px;">
ĐĄŃĐľĐ´Đ°, 5 Đ°ĐżŃĐľĐťŃ 2017, 16:34 +03:00 ĐžŃ DK7FC
<a class="moz-txt-link-rfc2396E" href="mailto:selberdenken@posteo.de">&lt;selberdenken@posteo.de&gt;</a>:<br>
    <br>
    <div id="">
    <div class="js-helper js-readmsg-msg">
    <div>
    <div id="style_14913992980000001195_BODY"> VLF, <br>
    <br>
There is a trace very close to <span class="js-phone-number">8270.005</span>
Hz on the 47 uHz spectrogramm
of the RC4HAA VLF grabber, <b><a moz-do-not-send="true"
 href="http://136.su/grabber/" target="_blank">http://136.su/grabber/</a></b><br>
This is a land path distance of <b>2877 km</b>,
    <a moz-do-not-send="true"
 href="http://no.nonsense.ee/qth/map.html?qth=LO53CF34HC&amp;from=jn49ik00wd"
 target="_blank">http://no.nonsense.ee/qth/map.html?qth=LO53CF34HC&amp;from=jn49ik00wd</a></div>
    </div>
    </div>
    </div>
  </blockquote>
  <blockquote
 style="border-left: 1px solid rgb(8, 87, 166); margin: 10px; padding: 0pt 0pt 0pt 10px;">
    <div id="">
    <div class="js-helper js-readmsg-msg">
    <div>
    <div id="style_14913992980000001195_BODY"><br>
    <br>
Actually the trace appears to be one pixel to high in frequency and it
looked to me that it has started a bit earlier than my transmission. So
i expect it is not my signal but some local noise. But meanwhile it
stays on the QRG quite stable. My carrier is still on the air since
yesterday 18:50 UTC. <br>
    <br>
So, i'll do QSY after 24 hours, at 18:50 UTC the carrier will jump to
    <span class="js-phone-number">8270.000</span> Hz. Then after some
hours we will see what happens! :-)<br>
    <br>
73, Stefan<br>
    <br>
Am 04.04.2017 21:43, schrieb DK7FC:
    <blockquote cite="mid:58E3F762.1030007@posteo.de" type="cite">Hi
all, <br>
      <br>
...running 700 mA again since 18:50 UTC. I am testing my new PVC coil
housing. It protects the coil from rain and sunlight. Fortunately it is
already proved that there are no dielectrical disadvantages (same
resonance and Q of the coil). But the open question is how the coil
will heat up inside the housing. So this transmission is a test again.
But the current amplitude is constant at 700 mA, the phase is stable
anyway. So it may be useful for some OMs testing their receivers... <br>
It will be on air long enough to see something in 47 uHz... <br>
      <br>
73, Stefan <br>
      <br>
    </blockquote>
    </div>
    </div>
    </div>
    </div>
  </blockquote>
  <br>
</blockquote>
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