Date: Wed, 2 Jan 2019 14:07:56 +0100 (CET)
From: Jacek Lipkowski <sq5bpf@lipkowski.org>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <110474941.11712178.1546426885002@mail.yahoo.com>
Message-ID: <alpine.DEB.2.11.1901021404440.1809@mailn.lipkowski.org>
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Subject: Re: ULF: Carrier on 2970.01 Hz
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Thanks Markus

You're right! This is a nice example how one can make a false result.

I will re-run the tests this evening.

VY 73

Jacek / SQ5BPF


On Wed, 2 Jan 2019, Markus Vester wrote:

> Date: Wed, 2 Jan 2019 11:01:24 +0000 (UTC)
> From: Markus Vester <markusvester@aol.com>
> Reply-To: rsgb_lf_group@blacksheep.org
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: ULF: Carrier on 2970.01 Hz
> 
> Hi Jacek,
> 
> wrong frequency? I think Stefan was on 2970.01 Hz, not 2970.1 Hz.
> 
> 73 and good luck,
> Markus
> 
> -----Ursprüngliche Mitteilung-----
> Von: Jacek Lipkowski <sq5bpf@lipkowski.org>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Mi, 2. Jan. 2019 10:43
> Betreff: Re: ULF: Carrier on 2970.01 Hz
> 
> This is the best i can do so far. Using vlfrx-tools 0.9f and
> 
> vtfilter -a th=5 -h hp,f=1750,poles=8 -h lp,f=4250,poles=8 | vtblank -a25 -d0.005 -t1000
> 
> Does that count as a reception?
> 
> VY 73 es HNY
> 
> Jacek / SQ5BPF
> 
> 
> On Sun, 30 Dec 2018, DK7FC wrote:
> 
> > Date: Sun, 30 Dec 2018 22:15:04 +0100
> > From: DK7FC <selberdenken@posteo.de>
> > Reply-To: rsgb_lf_group@blacksheep.org
> > To: rsgb_lf_group@blacksheep.org
> > Subject: Re: ULF: Carrier on 2970.01 Hz
> >
> > Hello Jacek,
> >
> > Did you just look into a spectrogram or did you try to produce a spectrum
> > peak from your data storage?
> > Do you use the -a th=x function in vtfilter.
> > I think i have the latest version of vlfrx-tools. It is worth to upgrade.
> > Instead of the band pass filter i'm using a low pass and a high pass. After a
> > lot of trials i tend to use this setting as a standard:
> > vtread -T2018-12-30,11:17,+2h /database | vtcat -p | vtfilter -a th=5 -h
> > hp,f=1750,poles=8 -h lp,4250,poles=8 | vtblank -a25 -d0.0005 -t100 | vtmult
> > -f2970.01 | vtresample -r240 | vtresample -r10 | vtraw -oa | ebnaut -dp8K19A
> > -c4 -r10 -v -f15 -f16 -N5 -M'*****' -k27 -S12
> >
> > The ebnaut message is just a dummy for a 2 hour long carrier transmission.
> > The output of that command line will show the S/N of the spectrum peak in its
> > bandwidth (1/duration).
> > The autonotch filter is important in that frequency range and can decide
> > between failed and success!
> >
> > I would be interested in the result on your side.
> >
> > 73, Stefan
> >
> >
> >
> > Am 30.12.2018 21:45, schrieb Jacek Lipkowski:
> >> Ufortunately i didn't receive anything here. Not very exciting but i
> >> believe that negative results should also be reported.
> >>
> >> The spectrograms:
> >>
> >> https://klubnl.pl/grabber/grabber_sq5bpf_2970.png
> >> https://klubnl.pl/grabber/grabber_sq5bpf_2970_avg.png
> >>
> >> Right now i use the same settings as on my 5170Hz grabber: a 3kHz wide
> >> filter centered on 2970Hz, followed by vtblank  -a1.4 -d0 -t100 (vtblank
> >> from old vlfrx-tools). I would be grateful for any suggestions how to
> >> improve this, maybe the filter is too wide (and lets too many 50Hz
> >> harmonics through. which upset the blanker).
> >>
> >> The antenna isn't optimised for ULF.
> >>
> >> VY 73
> >>
> >> Jacek / SQ5BPF
> >>
> >> On Sun, 30 Dec 2018, DK7FC wrote:
> >>
> >>> Date: Sun, 30 Dec 2018 12:38:04 +0100
> >>> From: DK7FC <selberdenken@posteo.de>
> >>> Reply-To: rsgb_lf_group@blacksheep.org
> >>> To: rsgb_lf_group@blacksheep.org
> >>> Subject: ULF: Carrier on 2970.01 Hz
> >>>
> >>> Hi ULF,
> >>>
> >>> The accu is fully recharged and i am on the hill again, transmitting on
> >>> the ground loop antenna. This time, the accu has even more power. The TX
> >>> power is 520 W (!), the DC measurement tells i need just 64 V for 1 A, and
> >>> now, at 2970.01 Hz i am getting a record antenna current of 2.75 A!!
> >>> The carrier ison the air since 11:17 UTC and i intend to run it for 2
> >>> hours again, like yesterday.
> >>>
> >>> Reports are welcome :-)
> >>>
> >>> 73, Stefan
> >>>
> >>
> >
> 
> 
>
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