To: | [email protected] |
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Subject: | Re: ULF: Carrier on 2970.01 Hz |
From: | Markus Vester <[email protected]> |
Date: | Wed, 2 Jan 2019 11:01:24 +0000 (UTC) |
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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 <[email protected]> An: rsgb_lf_group <[email protected]> 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 <[email protected]> > Reply-To: [email protected] > To: [email protected] > 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 <[email protected]> >>> Reply-To: [email protected] >>> To: [email protected] >>> 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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