From: =?Windows-1252?Q?VIGILANT_Luis_Fern=E1ndez?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: Re: EbNaut considerations for tomorrow...
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Date: Wed, 5 Jun 2019 20:58:13 +0000
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Subject: Re: LF: Re: EbNaut considerations for tomorrow...
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Hi Stefan, VLF

>Don't expect better results from a larger antenna at the same location

Not the same location. I'm using my Tx antenna in Benidorm (IM98wn). My gra=
bber runs in Albir, another location at 7km at IM98xn

Finally used a simple audio transformer to connect the vertical LF resonant=
 antenna to the PC audio card
And results are quite interesting. This is the 24KHz VLF band in a 20 minut=
es spectrogram
https://www.dropbox.com/s/fsmk8lbti8ap90d/Benidorm%2090m%20vertical%20LF%20=
tuned%20VLF%2024KHz%20spectrogram%2020%20minutes.JPG?dl=3D0

Comparing with Paul's VLF receiver I can see also the same stations here. T=
he lower JXN and the S/N are
quite aceptable. http://abelian.org/vlf/spectrum.shtml

The most important is that QRM from lift motors variators is produced just =
in a few frequencies, not wipping
all the band. You can see the elevators activity as signals around 16KHz, 1=
5KHz, 10.5KHz and strong at 8 and
around 5.5KHz

During the 20min there was a sudden reduction in background noise. This is =
not due to modifications in my
settings, but real QRM stopped. Has to investigate why it happens

I made a detailed spectrogram around 8KHz
https://www.dropbox.com/s/cjnsc0mpqdec5ho/Benidorm%2090m%20vertical%20LF%20=
tuned%20VLF%208270Hz%20spectrogram.JPG?dl=3D0

Fortunately the offending signals are concentrated on 7700, 8000 and 8300Hz=
. So 8270 with high integration will be out of the
elevators interference, which is a very good news :-)

I need a signal. And connect the audio to 1pps

Tonight I will be tuning the 11.904 Alpha. Seems that there is a fainth tra=
ce in my grabber


73 de Luis
EA5DOM

________________________________
De: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org]=
 en nombre de DK7FC [selberdenken@posteo.de]
Enviado: mi=E9rcoles, 5 de junio de 2019 8:02
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: Re: EbNaut considerations for tomorrow...

Hi Luis,

Moving the grabber to a quiter place is an =93old=94 plan. There are some o=
ptions but all of them requiere dedication
and negotiation. in other words =85. time!
I know :-) Everything needs dedication.
Using the transmitting antenna for Rx in VLF may be the quick option
Don't expect better results from a larger antenna at the same location.
It may be an option to build an active symmetrical antenna, as recently des=
cribed by DF9RB, and lift this as high as possible out of the 'cloud' of QR=
M which surrounds the building. But this is a new experimental project whic=
h, again, needs time and dedication :-) And it will never give the same goo=
d results as you can get from a quiet location.

I would suggest to use your existing VLF RX antenna and try it out on the a=
lternative location, using a notebook running SpecLab. Just for a few minut=
es. Use a fast running spectrogram, 500 ms/pixel covering 0...24 kHz. And t=
hen take a screen capture...

I=92m looking for 11.907Hz Alpha using the 90m vertical tuned for LF. I can=
 get fainth traces with the MiniWhip
from 06 to 10 UTC which can be seen in my grabber. Let=92s see if there is =
something detected with the vertical
despite the elevators QRM
The Alphas are OFF since some months, except some temporary periods taking =
a few hours, sometimes with reduced power or not all transmitters active.
ZEVS is back with good availability since some time again but it is more ch=
allenging to receive it at all.

I=92m using the Perseur for that. The PC soundcard would be better at that =
frequency. Must make an interface
T-O-D-A-Y  ;-)
That was yesterday. And did you? :-)

73, Stefan

--_000_6DB8451D7F3D3947A5918808A59621EA5BEBAD4Fservigilantvigi_
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<body bgcolor=3D"#ffffff" fpstyle=3D"1" ocsi=3D"0">
<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;">Hi Stefan, VLF
<div><br>
</div>
<div><span style=3D"font-family: &quot;Times New Roman&quot;; font-size: 16=
px;">&gt;Don't expect better results from a larger antenna at the same loca=
tion</span></div>
<div><br>
</div>
<div>Not the same location. I'm using my Tx antenna in Benidorm (IM98wn). M=
y grabber runs in Albir, another location at 7km at IM98xn</div>
<div><br>
</div>
<div>Finally used a simple audio transformer to connect the vertical LF res=
onant antenna to the PC audio card</div>
<div>And results are quite interesting. This is the 24KHz VLF band in a 20 =
minutes spectrogram</div>
<div>https://www.dropbox.com/s/fsmk8lbti8ap90d/Benidorm%2090m%20vertical%20=
LF%20tuned%20VLF%2024KHz%20spectrogram%2020%20minutes.JPG?dl=3D0</div>
<div><br>
</div>
<div>Comparing with Paul's VLF receiver I can see also the same stations he=
re. The lower JXN and the S/N are</div>
<div>quite aceptable.&nbsp;<a href=3D"http://abelian.org/vlf/spectrum.shtml=
" style=3D"font-size: 10pt;">http://abelian.org/vlf/spectrum.shtml</a></div=
>
<div><br>
</div>
<div>The most important is that QRM from lift motors variators is produced =
just in a few frequencies, not wipping</div>
<div>all the band. You can see the elevators activity as signals around 16K=
Hz, 15KHz, 10.5KHz and strong at 8 and</div>
<div>around 5.5KHz</div>
<div><br>
</div>
<div>During the 20min there was a sudden reduction in background noise. Thi=
s is not due to modifications in my</div>
<div>settings, but real QRM stopped. Has to investigate why it happens</div=
>
<div><br>
</div>
<div>I made a detailed spectrogram around 8KHz</div>
<div>https://www.dropbox.com/s/cjnsc0mpqdec5ho/Benidorm%2090m%20vertical%20=
LF%20tuned%20VLF%208270Hz%20spectrogram.JPG?dl=3D0</div>
<div><br>
</div>
<div>Fortunately the offending signals are concentrated on 7700, 8000 and 8=
300Hz. So 8270 with high integration will be out of the</div>
<div>elevators interference, which is a very good news :-)</div>
<div><br>
</div>
<div>I need a signal. And connect the audio to 1pps</div>
<div><br>
</div>
<div>Tonight I will be tuning the 11.904 Alpha. Seems that there is a faint=
h trace in my grabber</div>
<div><br>
</div>
<div><br>
</div>
<div>73 de Luis</div>
<div>EA5DOM</div>
<div><br>
</div>
<div>
<div style=3D"font-family: Times New Roman; color: #000000; font-size: 16px=
">
<hr tabindex=3D"-1">
<div id=3D"divRpF216124" style=3D"direction: ltr;"><font face=3D"Tahoma" si=
ze=3D"2" color=3D"#000000"><b>De:</b> owner-rsgb_lf_group@blacksheep.org [o=
wner-rsgb_lf_group@blacksheep.org] en nombre de DK7FC [selberdenken@posteo.=
de]<br>
<b>Enviado:</b> mi=E9rcoles, 5 de junio de 2019 8:02<br>
<b>Para:</b> rsgb_lf_group@blacksheep.org<br>
<b>Asunto:</b> Re: LF: Re: EbNaut considerations for tomorrow...<br>
</font><br>
</div>
<div></div>
<div>Hi Luis,<br>
<br>
<blockquote type=3D"cite">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Moving the grabber to a quiter place is an =93old=94 plan. There are some o=
ptions but all of them requiere dedication</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
and negotiation. in other words =85. time!
</span></p>
</div>
</blockquote>
I know :-) Everything needs dedication.<br>
<blockquote type=3D"cite">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
Using the transmitting antenna for Rx in VLF may be the quick option</span>=
</p>
</div>
</blockquote>
Don't expect better results from a larger antenna at the same location. <br=
>
It may be an option to build an active symmetrical antenna, as recently des=
cribed by DF9RB, and lift this as high as possible out of the 'cloud' of QR=
M which surrounds the building. But this is a new experimental project whic=
h, again, needs time and dedication
 :-) And it will never give the same good results as you can get from a qui=
et location.<br>
<br>
I would suggest to use your existing VLF RX antenna and try it out on the a=
lternative location, using a notebook running SpecLab. Just for a few minut=
es. Use a fast running spectrogram, 500 ms/pixel covering 0...24 kHz. And t=
hen take a screen capture...<br>
<br>
<blockquote type=3D"cite">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
I=92m looking for 11.907Hz Alpha using the 90m vertical tuned for LF. I can=
 get fainth traces with the MiniWhip</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
from 06 to 10 UTC which can be seen in my grabber. Let=92s see if there is =
something detected with the vertical</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
despite the elevators QRM</span></p>
</div>
</blockquote>
The Alphas are OFF since some months, except some temporary periods taking =
a few hours, sometimes with reduced power or not all transmitters active.<b=
r>
ZEVS is back with good availability since some time again but it is more ch=
allenging to receive it at all.<br>
<br>
<blockquote type=3D"cite">
<div class=3D"WordSection1"><span lang=3D"EN-US" style=3D"color:rgb(31,73,1=
25)">I=92m using the Perseur for that. The PC soundcard would be better at =
that frequency. Must make an interface</span>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:rgb(31,73,125)">=
T-O-D-A-Y&nbsp; ;-)</span></p>
</div>
</blockquote>
That was yesterday. And did you? :-)<br>
<br>
73, Stefan<span lang=3D"EN-US"></span>
<blockquote type=3D"cite">
<div class=3D"WordSection1">
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</div>
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