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From: Domenico IZ7SLZ <iz7slz.domenico@gmail.com>
Date: Fri, 23 Jun 2017 13:23:04 +0200
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To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: hunting IK1HGI on LF
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Hello LF,

Yes, IK1HGI is ready for EbNaut transmission this afternoon starting from
11:30 UT every 30 minutes.
QRG =3D 137493 Hz, char =3D 6, code 8K19A,  period =3D 1 second. Duration 9=
' 20''

Good luck.
73, Domenico.

PS: thanks to Paul N. for the advice. I will try his suggestions.


On 23 June 2017 at 12:55, Markus Vester <markusvester@aol.com> wrote:

> Thanks Domenico.
>
> Yesterday evening we had monstrous QRN, but a faint and stable line becam=
e
> visible on my opds between 4 and 5:30 UT. An opds-32 detection requires
> about 15 dB for the central carrier of the 50% AM transmission, equivalen=
t
> to 21 dB for a pure carrier in 0.47 mHz. We have been detecting IK1IGI
> frequently here, and I'm indeed interested to attempt an EbNaut decode. T=
he
> best time may be around noon (i.e. now), when dayrime skywave is stronges=
t
> and QRN hasn't built up yet.
>
> Best 73,
> Markus
>
> -----Urspr=C3=BCngliche Mitteilung-----
> Von: Domenico IZ7SLZ <iz7slz.domenico@gmail.com>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Fr, 23. Jun 2017 11:28
> Betreff: LF: hunting IK1HGI on LF
> Hi LF,
> in these days, Tony IK1HGI from JN45jj, is transmitting some (not
> announced) EbNaut test message on LF and he is active in op32. He is usin=
g
> a very stable exciter formed by a GPS Neo-7 which time port TP5 has been
> reprogrammed to output directly the operating frequency (i.e. 137493,000
> Hz).
> I invite all interested LF operators to try this solution becouse it's
> cheap, easy to built and it works !
> Riccardo IW4DXW, who had this idea, is writing some
> post to the group with his indications on buffering the TP5 signal, obtai=
n
> a BPSK and ASK modulator, reprogramming the GPS parameters.
> Erp transmitted by Tony is low due to very short antenna placed on his
> balcon, short cap-hat wires,  poor ground system and low power output
> (around 70 W) with some mismatching.
> So catching  his signal is a challenge for me in JN80nu (abt. 920 km).
>
> Last night i saw some traces of his signal on my opds Spectrum Lab
> waterfall but no opera detections were possibile even by reducing
> thresholds in opds.ini.
> I have also used Paul Nicholson's vlfrx-tools programs to record the audi=
o
> coming from LF receiver. Then i tried this morning to obtain  4 hour-long
> FFT  centered on IK1HGI qrg after filtering and blanking the signal.
>
> I got an evident peak that i'm almost sure that comes from Tony.
>
> These are the commands that i have used (i'm new on vlfrx-tools so i hope
> do not make big mistakes):
>
> vtread -v -T2017-06-22_23:40,+16000 /media/iz7slz/Storage/ |
> vtfilter -v -h bp,f=3D1500,w=3D2000 |
> vtblank -v -a2 -d0 -t10 |
> vtnspec -v -f 1493 -w0.02 -r6.25e-5 > spectrum.dat
>
> that vtblank settings comes out after many attempts.
> 73, Domenico IZ7SLZ
>
>
>
>
>
>

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<div dir=3D"ltr"><div><div><div><div><div>Hello LF,<br><br></div>Yes, IK1HG=
I is ready for EbNaut transmission this afternoon starting from 11:30 UT ev=
ery 30 minutes.<br></div>QRG =3D 137493 Hz, char =3D 6, code 8K19A,=C2=A0 p=
eriod =3D 1 second. Duration 9&#39; 20&#39;&#39;<br><br></div>Good luck.<br=
></div>73, Domenico.<br><br></div>PS: thanks to Paul N. for the advice. I w=
ill try his suggestions.<br><br></div><div class=3D"gmail_extra"><br><div c=
lass=3D"gmail_quote">On 23 June 2017 at 12:55, Markus Vester <span dir=3D"l=
tr">&lt;<a href=3D"mailto:markusvester@aol.com" target=3D"_blank">markusves=
ter@aol.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div st=
yle=3D"font-size:10pt;font-family:arial,helvetica,sans-serif;color:black"><=
div style=3D"color:black;font-family:arial,helvetica,sans-serif;font-size:1=
0pt">Thanks Domenico.<br><br>Yesterday evening we had monstrous QRN,=C2=A0b=
ut a faint and stable line became visible on my opds between 4 and 5:30 UT.=
=C2=A0An opds-32 detection requires about 15 dB for the central carrier of =
the 50% AM transmission, equivalent to=C2=A021=C2=A0dB for a pure carrier i=
n 0.47 mHz.=C2=A0We have been detecting IK1IGI frequently here, and I&#39;m=
 indeed interested to attempt=C2=A0an EbNaut decode. The best time may be a=
round noon (i.e. now), when dayrime skywave is strongest and QRN hasn&#39;t=
 built up yet.<br><br>Best 73,<br>Markus<br><br>-----Urspr=C3=BCngliche Mit=
teilung----- <br>Von: Domenico IZ7SLZ &lt;<a href=3D"mailto:iz7slz.domenico=
@gmail.com" target=3D"_blank">iz7slz.domenico@gmail.com</a>&gt;<br>An: rsgb=
_lf_group &lt;<a href=3D"mailto:rsgb_lf_group@blacksheep.org" target=3D"_bl=
ank">rsgb_lf_group@blacksheep.org</a>&gt;<br>Verschickt: Fr, 23. Jun 2017 1=
1:28<br>Betreff: LF: hunting IK1HGI on LF<br></div><div><div class=3D"h5">
<div id=3D"m_-7406416189059777154AOLMsgPart_1.2_cef55444-9c77-47c0-951b-423=
9d4137f18">
<div class=3D"m_-7406416189059777154aolReplacedBody"><div dir=3D"ltr"><div>=
<div><div><div><div><div>Hi LF,<br></div>in these days, Tony IK1HGI from JN=
45jj, is transmitting some (not announced) EbNaut test message on LF and he=
 is active in op32. He is using a very stable exciter formed by a GPS Neo-7=
 which time port TP5 has been reprogrammed to output directly the operating=
 frequency (i.e. 137493,000 Hz).<br></div></div>I invite all interested LF =
operators to try this solution becouse it&#39;s cheap, easy to built and it=
 works !<br></div><div>Riccardo IW4DXW, who had this idea, is writing some =
<br></div><div>post to the group with his indications on buffering the TP5 =
signal, obtain a BPSK and ASK modulator, reprogramming the GPS parameters.<=
br></div><div>Erp transmitted by Tony is low due to very short antenna plac=
ed on his balcon, short cap-hat wires,=C2=A0 poor ground system and low pow=
er output (around 70 W) with some mismatching.<br>So catching=C2=A0 his sig=
nal is a challenge for me in JN80nu (abt. 920 km).<br><br>Last night i saw =
some traces of his signal on my opds Spectrum Lab waterfall but no opera de=
tections were possibile even by reducing thresholds in opds.ini.<br></div><=
/div></div>I have also used Paul Nicholson&#39;s vlfrx-tools programs to re=
cord the audio coming from LF receiver. Then i tried this morning to obtain=
=C2=A0 4 hour-long=C2=A0 FFT=C2=A0 centered on IK1HGI qrg after filtering a=
nd blanking the signal.=C2=A0<br><br>I got an evident peak that i&#39;m alm=
ost sure that comes from Tony.<br><br>These are the commands that i have us=
ed (i&#39;m new on vlfrx-tools so i hope do not make big mistakes):<br><br>=
vtread -v -T2017-06-22_23:40,+16000 /media/iz7slz/Storage/ |<br>vtfilter -v=
 -h bp,f=3D1500,w=3D2000 | <br>vtblank -v -a2 -d0 -t10 |<br>vtnspec -v -f 1=
493 -w0.02 -r6.25e-5 &gt; spectrum.dat<br><br>that vtblank settings comes o=
ut after many attempts.<br><div><div><div><div><div><div>73, Domenico IZ7SL=
Z<br></div><div><br><br></div><div><div><br><br></div></div></div></div></d=
iv></div></div></div>
</div>
</div>

<br></div></div></div></blockquote></div><br></div>

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