From: =?iso-8859-1?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...
Thread-Index: AQHVGILh1CHiRmVdOUO3rVR+giePgaaIyujigAFwZYCAAPKDkIABSBWAgAEWkdWAAOjxAIAAjBwe
Date: Thu, 6 Jun 2019 19:08:49 +0000
Message-ID: <6DB8451D7F3D3947A5918808A59621EA5BEBBACC@servigilant.vigilant.local>
References: <6DB8451D7F3D3947A5918808A59621EA31596319@servigilant.vigilant.local>,<5CF283CC.9010701@posteo.de>
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Subject: Re: LF: Re: EbNaut considerations for tomorrow...
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Hi Stefan, VLF


>Yes, looks much better than the other antenna. I can see sferics for the f=
irst time there, which is a good >step. The LF resonance will have no real =
effect. So the audio transformer is on the roof and then you >lay out a lon=
g cable which is then connected to the soundcard in the shack?

Not exactly. There is a coax cable from the roof to shack. No transformers =
at the antenna
The variometer, coil, vertical section and topload hat is all connected to =
the inner of the coax
Coax ground is connected to the metal pipe which runs inside the building t=
o the basement

>The cable is floating at the transformer end?

The coax cable in the shack is connected to the audio transformer. The othe=
r side of the audio
transformer is directly connected to PC soundcard

>Maybe you can use that signal for some time to generate a slower spectrogr=
am covering 0...24 kHz, >with better brightness/contrast adjustment. This w=
ould give a better impression about the sensitivity. If >you disconnect the=
 antenna, how much (in dB) does the noise floor drop then?

Measured at 10KHz. From about -110dB with antenna it drops to -135dB withou=
t antenna

>Hm, it does not tell to much but it is promising. Also, a spectrogram runn=
ing at 1 pix/min would give >a better impression.

Yes. I'm doing that. Let's see what can I get

73 de Luis
EA5DOM

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10pt;">Hi Stefan, VLF
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<div>&gt;Yes, looks much better than the other antenna. I can see sferics f=
or the first time there, which is a good &gt;step. The LF resonance will ha=
ve no real effect. So the audio transformer is on the roof and then you &gt=
;lay out a long cable which is then connected
 to the soundcard in the shack?&nbsp;</div>
<div><br>
</div>
<div>Not exactly. There is a coax cable from the roof to shack. No transfor=
mers at the antenna</div>
<div>The variometer, coil, vertical section and topload hat is all connecte=
d to the inner of the coax</div>
<div>Coax ground is connected to the metal pipe which runs inside the build=
ing to the basement</div>
<div><br>
</div>
<div>&gt;The cable is floating at the transformer end?</div>
<div><br>
</div>
<div>The coax cable in the shack is connected to the audio transformer. The=
 other side of the audio</div>
<div>transformer is directly connected to PC soundcard</div>
<div><br>
&gt;Maybe you can use that signal for some time to generate a slower spectr=
ogram covering 0...24 kHz, &gt;with better brightness/contrast adjustment. =
This would give a better impression about the sensitivity. If &gt;you disco=
nnect the antenna, how much (in dB) does
 the noise floor drop then?</div>
<div><br>
</div>
<div>Measured at 10KHz. From about -110dB with antenna it drops to -135dB w=
ithout antenna</div>
<div><br>
</div>
<div>&gt;Hm, it does not tell to much but it is promising. Also, a spectrog=
ram running at 1 pix/min would give &gt;a better impression.<br>
<br>
Yes. I'm doing that. Let's see what can I get<br>
<br>
73 de Luis</div>
<div>EA5DOM</div>
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