Date: Fri, 23 Jun 2017 06:55:02 -0400
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
Message-Id: <15cd497413a-3f99-28f2a@webprd-m96.mail.aol.com>
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Subject: Re: LF: hunting IK1HGI on LF
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Thanks Domenico.

Yesterday evening we had monstrous QRN, but a faint and stable line became =
visible on my opds between 4 and 5:30 UT. An opds-32 detection requires abo=
ut 15 dB for the central carrier of the 50% AM transmission, equivalent to =
21 dB for a pure carrier in 0.47 mHz. We have been detecting IK1IGI frequen=
tly here, and I'm indeed interested to attempt an EbNaut decode. The best t=
ime may be around noon (i.e. now), when dayrime skywave is strongest and QR=
N hasn't built up yet.

Best 73,
Markus

-----Urspr=C3=BCngliche Mitteilung-----=20
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 using a very st=
able exciter formed by a GPS Neo-7 which time port TP5 has been reprogramme=
d to output directly the operating frequency (i.e. 137493,000 Hz).
I invite all interested LF operators to try this solution becouse it's chea=
p, easy to built and it works !

Riccardo IW4DXW, who had this idea, is writing some=20


post to the group with his indications on buffering the TP5 signal, obtain =
a BPSK and ASK modulator, reprogramming the GPS parameters.


Erp transmitted by Tony is low due to very short antenna placed on his balc=
on, short cap-hat wires,  poor ground system and low power output (around 7=
0 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 waterfal=
l but no opera detections were possibile even by reducing thresholds in opd=
s.ini.

I have also used Paul Nicholson's vlfrx-tools programs to record the audio =
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.=20

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 d=
o not make big mistakes):

vtread -v -T2017-06-22_23:40,+16000 /media/iz7slz/Storage/ |
vtfilter -v -h bp,f=3D1500,w=3D2000 |=20
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 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 Domenico.<br><br>Yesterday evening we had monstro=
us QRN,&nbsp;but a faint and stable line became visible on my opds between =
4 and 5:30 UT.&nbsp;An opds-32 detection requires about 15 dB for the centr=
al carrier of the 50% AM transmission, equivalent to&nbsp;21&nbsp;dB for a =
pure carrier in 0.47 mHz.&nbsp;We have been detecting IK1IGI frequently her=
e, and I'm indeed interested to attempt&nbsp;an EbNaut decode. The best tim=
e may be around noon (i.e. now), when dayrime skywave is strongest and QRN =
hasn't built up yet.<br><br>Best 73,<br>Markus<br><br>-----Urspr=C3=BCnglic=
he Mitteilung----- <br>Von: Domenico IZ7SLZ &lt;iz7slz.domenico@gmail.com&g=
t;<br>An: rsgb_lf_group &lt;rsgb_lf_group@blacksheep.org&gt;<br>Verschickt:=
 Fr, 23. Jun 2017 11:28<br>Betreff: LF: hunting IK1HGI on LF<br></div>
<div id=3D"AOLMsgPart_1.2_cef55444-9c77-47c0-951b-4239d4137f18">
<div class=3D"aolReplacedBody"><div dir=3D"ltr"><div><div><div><div><div><d=
iv>Hi LF,<br></div>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 using a very stable exciter formed by a GPS Neo-7 which time port TP5 h=
as been reprogrammed to output directly the operating frequency (i.e. 13749=
3,000 Hz).<br></div></div>I invite all interested LF operators to try this =
solution becouse it's cheap, easy to built and it works !<br></div><div>Ric=
cardo 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 transmit=
ted by Tony is low due to very short antenna placed on his balcon, short ca=
p-hat wires,&nbsp; poor ground system and low power output (around 70 W) wi=
th some mismatching.<br>So catching&nbsp; his signal 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 detections were possibile ev=
en by reducing thresholds in opds.ini.<br></div></div></div>I have also use=
d Paul Nicholson's vlfrx-tools programs to record the audio coming from LF =
receiver. Then i tried this morning to obtain&nbsp; 4 hour-long&nbsp; FFT&n=
bsp; centered on IK1HGI qrg after filtering and blanking the signal.&nbsp;<=
br><br>I got an evident peak that i'm almost sure that comes from Tony.<br>=
<br>These are the commands that i have used (i'm new on vlfrx-tools so i ho=
pe do not make big mistakes):<br><br>vtread -v -T2017-06-22_23:40,+16000 /m=
edia/iz7slz/Storage/ |<br>vtfilter -v -h bp,f=3D1500,w=3D2000 | <br>vtblank=
 -v -a2 -d0 -t10 |<br>vtnspec -v -f 1493 -w0.02 -r6.25e-5 &gt; spectrum.dat=
<br><br>that vtblank settings comes out after many attempts.<br><div><div><=
div><div><div><div>73, Domenico IZ7SLZ<br></div><div><br><br></div><div><di=
v><br><br></div></div></div></div></div></div></div></div>
</div>
</div>

<br></div>
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