Date: Sat, 18 Feb 2017 12:19:33 -0500
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
Message-Id: <15a523c6252-59e0-1118f@webprd-m14.mail.aol.com>
In-Reply-To: <36cfa6f6-f452-df08-f45f-eb5df19eb3ea@freenet.de>
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Subject: Re: VLF: EbNaut also on 8270.033333 Hz
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Thanks Wolf, there's indeed a beautiful Whistler festival going on! After h=
aving read the post on the VLF Group, I had listened in Thursday night whic=
h was already quite extraordinary, But right now the activity is even more =
intense! And your vlf6 stream seems to be in a prime position. Are you feed=
ing it from your wireless E-field antenna?

Well, how much power would be needed for a narrowband Amateur signal to be =
detected in Madagascar, what is the path loss? Think I've read somewhere th=
at whistler propagation could possibly even be enhanced by stimulated emiss=
ion, providing Maser-like amplification rather than attenuation.

Thanks again to the contributors of these beautiful natural radio streams!

All the best,
Markus (DF6NM)
=20


-----Urspr=C3=BCngliche Mitteilung-----=20
Von: DL4YHF <dl4yhf@freenet.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 18. Feb 2017 15:25
Betreff: Re: VLF: EbNaut also on 8270.033333 Hz


Hi VLFers,

 Turn up the power, you may trigger a Whistler ... well, no, joking aside: =
At the moment there's an impressive whistler storm happening. Fascinating l=
istening to Paul's internet VLF audio streams ( http://abelian.org/vlf/ ).

 73,
   Wolf DL4YHF .


Am 18.02.2017 um 14:41 schrieb Markus Vester:


Hi Jacek, VLF,

 from previous successful DK7FC decodes, it looks as if you might also be a=
ble to receive a ~10 dB weaker signal from here (10 uW EMRP). Apparently th=
e rain has ended now, so I would like to try an overnight EbNaut transmissi=
on with only two characters:

 Frequency: 8270.0333333 Hz,
 2 characters, 8K19A, 18 bit CRC (!),
 90 s symbols, message duration 9:36 hours,
 start 2017-02-18 19:00 UT, end 4:36 UT (Sunday)=20

 The 1/30 Hz frequency offset has been chosen to avoid mutual interference =
with the announced DK7FC transmission on 8270.1 Hz: With the frequency spac=
ing being an integer multiple of both symbolrates, and synchroneous bit tim=
ing, the symbol waveforms should be orthogonal because the "other" signal a=
lways undergoes a whole number of 360=C2=B0 cycles during the decoder's sym=
bol integration interval.

 Best 73,
 Markus (DF6NM)
    =20


-----Urspr=C3=BCngliche Mitteilung-----=20
Von: Jacek Lipkowski <sq5bpf@lipkowski.org>
 An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
 Verschickt: Di, 14. Feb 2017 17:23
 Betreff: Re: LF: Re: DK7FC EbNaut message on 8270.1 Hz decoded nr Moscow b=
y RN3AUS


Nice decode here for your transmission on 13 Fen 2017 20:40

 found rank 0 ber 3.0469e-01 Eb/N0 10.7 M -1.697070885e+01 [XX] ps [ 0 0 0 =
0 0]
 carrier phase: 5.3
 carrier Eb/N0: 10.9
 carrier S/N: 21.44 dB in 32.6 uHz
 elapsed 29

 Switched the message to XX (sent to Stefan off list), so i don't spoil=20
 other's fun

 VY 73

 Jacek / SQ5BPF
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<div style=3D"font-size:10pt;font-family:arial,helvetica,sans-serif;color:b=
lack;"><div style=3D"color: black; font-family: arial,helvetica,sans-serif;=
 font-size: 10pt;">Thanks Wolf, there's indeed a beautiful Whistler festiva=
l&nbsp;going on!&nbsp;After having read the post on the VLF Group, I&nbsp;h=
ad listened in Thursday night which was already quite extraordinary, But ri=
ght now the activity is even more intense! And your vlf6 stream&nbsp;seems =
to be in&nbsp;a prime position. Are you feeding it from your wireless E-fie=
ld antenna?<br><br>Well, how much power would be needed for a narrowband Am=
ateur signal to be detected in Madagascar, what is the path loss? Think I'v=
e read somewhere that&nbsp;whistler propagation could possibly even be enha=
nced by stimulated emission, providing Maser-like amplification rather than=
 attenuation.<br><br>Thanks again to the contributors of these beautiful na=
tural radio streams!<br><br>All the best,<br>Markus&nbsp;(DF6NM)<br>&nbsp;<=
br><br><br>-----Urspr=C3=BCngliche Mitteilung----- <br>Von: DL4YHF &lt;dl4y=
hf@freenet.de&gt;<br>An: rsgb_lf_group &lt;rsgb_lf_group@blacksheep.org&gt;=
<br>Verschickt: Sa, 18. Feb 2017 15:25<br>Betreff: Re: VLF: EbNaut also on =
8270.033333 Hz<br><br></div>
<div id=3D"AOLMsgPart_2_4fc18b98-dfaa-4b4c-9b28-fbeed6e84821">
<div class=3D"aolReplacedBody" text=3D"#000000" bgcolor=3D"#FFFFFF">
    Hi VLFers,<br>
    <br>
    Turn up the power, you may trigger a Whistler ... well, no, joking
    aside: At the moment there's an impressive whistler storm happening.
    Fascinating listening to Paul's internet VLF audio streams (
    <a class=3D"aolmail_moz-txt-link-freetext" href=3D"http://abelian.org/v=
lf/" target=3D"_blank" rel=3D"noopener noreferrer">http://abelian.org/vlf/<=
/a> ).<br>
    <br>
    73,<br>
    &nbsp; Wolf DL4YHF .<br>
    <br>
    <div class=3D"aolmail_moz-cite-prefix">Am 18.02.2017 um 14:41 schrieb M=
arkus
      Vester:<br>
    </div>
    <blockquote cite=3D"about:blank">
      <div style=3D"color: black; font-family: arial,helvetica,sans-serif; =
font-size: 10pt;">
        <div style=3D"color: black; font-family: arial,helvetica,sans-serif=
; font-size: 10pt;">Hi Jacek, VLF,<br>
          <br>
          from previous successful DK7FC decodes, it looks as if you
          might also be able to receive&nbsp;a ~10 dB weaker signal from he=
re
          (10 uW EMRP).&nbsp;Apparently&nbsp;the&nbsp;rain has ended now, s=
o I would
          like to try an overnight&nbsp;EbNaut transmission with only two
          characters:<br>
          <br>
          Frequency: 8270.0333333 Hz,<br>
          2 characters, 8K19A, 18 bit CRC (!),<br>
          90 s symbols, message&nbsp;duration 9:36 hours,<br>
          start 2017-02-18 19:00 UT, end 4:36 UT (Sunday)&nbsp;<br>
          <br>
          The&nbsp;1/30 Hz frequency&nbsp;offset has been chosen to avoid m=
utual
          interference with the&nbsp;announced DK7FC transmission on 8270.1
          Hz: With&nbsp;the frequency spacing being&nbsp;an integer multipl=
e of
          both symbolrates, and synchroneous bit timing, the&nbsp;symbol
          waveforms&nbsp;should be&nbsp;orthogonal because the "other"
          signal&nbsp;always undergoes a&nbsp;whole number of 360=C2=B0 cyc=
les&nbsp;during
          the decoder's&nbsp;symbol integration interval.<br>
          <br>
          Best 73,<br>
          Markus (DF6NM)<br>
          &nbsp;&nbsp;&nbsp;&nbsp;<br>
          <br>
          <br>
          -----Urspr=C3=BCngliche Mitteilung----- <br>
          Von: Jacek Lipkowski <a class=3D"aolmail_moz-txt-link-rfc2396E" h=
ref=3D"mailto:sq5bpf@lipkowski.org" target=3D"_blank" rel=3D"noopener noref=
errer">&lt;sq5bpf@lipkowski.org&gt;</a><br>
          An: rsgb_lf_group <a class=3D"aolmail_moz-txt-link-rfc2396E" href=
=3D"mailto:rsgb_lf_group@blacksheep.org" target=3D"_blank" rel=3D"noopener =
noreferrer">&lt;rsgb_lf_group@blacksheep.org&gt;</a><br>
          Verschickt: Di, 14. Feb 2017 17:23<br>
          Betreff: Re: LF: Re: DK7FC EbNaut message on 8270.1 Hz decoded
          nr Moscow by RN3AUS<br>
          <br>
        </div>
        Nice decode here for your transmission on 13 Fen 2017 20:40<br>
        <br>
        found rank 0 ber 3.0469e-01 Eb/N0 10.7 M -1.697070885e+01 [XX]
        ps [ 0 0 0 0 0]<br>
        carrier phase: 5.3<br>
        carrier Eb/N0: 10.9<br>
        carrier S/N: 21.44 dB in 32.6 uHz<br>
        elapsed 29<br>
        <br>
        Switched the message to XX (sent to Stefan off list), so i don't
        spoil <br>
        other's fun<br>
        <br>
        VY 73<br>
        <br>
        Jacek / SQ5BPF<br>
      </div>
    </blockquote>
    <br>
 =20

</div>
</div></div>
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