Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id x17KEE9J026590 for ; Thu, 7 Feb 2019 21:14:16 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1grpvp-0003I6-CR for rs_out_1@blacksheep.org; Thu, 07 Feb 2019 20:05:57 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1grpvW-0003Hx-Ld for rsgb_lf_group@blacksheep.org; Thu, 07 Feb 2019 20:05:38 +0000 Received: from smtp1web.tin.it ([212.216.176.195]) by relay1.thorcom.net with esmtp (Exim 4.91) (envelope-from ) id 1grpvT-0000gw-Th for rsgb_lf_group@blacksheep.org; Thu, 07 Feb 2019 20:05:37 +0000 Received: from feu1 (10.192.64.11) by smtp1web.tin.it (8.6.060.43) id 5AB0B63D07CF3FDC for rsgb_lf_group@blacksheep.org; Thu, 7 Feb 2019 21:05:33 +0100 Received: from (79.40.224.233) by webmailtin.pc.tim.it; Thu, 7 Feb 2019 21:05:33 +0100 Message-ID: <168c990c144.marcocadeddu@tin.it> Date: Thu, 7 Feb 2019 21:05:33 +0100 (CET) From: "marcocadeddu@tin.it" To: Mime-Version: 1.0 X-Originating-IP: 79.40.224.233:2112 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. 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Content preview: ! ! ! :-)) no words Stefan but... big smail ;-) I figure that next step is collecting a bulk of batteries and a shaker to go down to 0,001 Hz ;-))) amazing.. simply amazing Marco Ik1HSS Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.216.176.195 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (marcocadeddu[at]tin.it) 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 052e5a7ab87161a07560b72babff3441 Subject: R: Re: ELF: Carrier on 22.97 Hz Content-Type: multipart/alternative; boundary="----=_Part_69226_6006324.1549569933639" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false ------=_Part_69226_6006324.1549569933639 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit ! ! ! :-)) no words Stefan but... big smail ;-) I figure that next step is collecting a bulk of batteries and a shaker to go down to 0,001 Hz ;-))) amazing.. simply amazing Marco Ik1HSS ----Messaggio originale---- Da: selberdenken@posteo.de Data: 7-feb-2019 19.54 A: Ogg: Re: ELF: Carrier on 22.97 Hz ...wow, after analysing the first 90 minutes of the transmission i found that the best SNR is achieved without sferic blanking! So then the hum filter and the low pass filter can be disabled too. So far, during that noisy evening period, i'm getting about 14 dB SNR in 185 uHz. Unfortunately i temporarely overloaded the PC while doing the analysis, which caused an interruption of the stream and then all SpecLab instances did a restart. Now the spectrogram is generated from the unfiltered and unblanked stream and now we can already see a clear peak right on the expected frequency, showing about 10 dB SNR. I intend to run the carrier at least for 24 hours, if all works well. Not sure if and how the antenna current will drop when it starts to rain. It would have been better to decouple the DC component from the antenna by using a big series capacitor but id didn't have one that holds 20 kV or so. More later... 73, Stefan Am 07.02.2019 17:05, schrieb DK7FC: Hi ELF ;-) I'm glad to announce that since 15:46 UTC i am transmitting on ELF (the real ELF, i.e. into the range of 3...30 Hz, ITU radio band 1 ) for the first time ever. Here are the parameters: TX frequency: 22.970 Hz Wavelength of that frequency: 13060 km Antenna voltage: 4.8 kV rms (+ a DC component of 7.5 kV) Antenna current: 325 uA ERP: 600 aW, or 6E-16 W Call it QRP! The goal is to detect the signal on my 3.5 km distant tree grabber, whose E field is now working again. Since the E field probe is not to far above the tree, the effective height is not as much as it should ideally be, at this frequency, so the RX is somewhat deaf. Anyway i can see the Schumann resonances and the 60 Hz power grid. So i hope it will work. A spectrogram which is centered on the frequency of interest in now shown at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html (3rd window). But maybe 424 uHz FFT bin width is even to optimistic! In a few minutes we'll see more :-) It takes about 40 minutes until a peak could have fully developed... 73, Stefan ------=_Part_69226_6006324.1549569933639 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: 7bit !
!
!
:-))
no words Stefan but... big smail ;-)
I figure that next step is collecting a bulk of batteries and a shaker to go down to 0,001 Hz ;-)))

amazing.. simply amazing

Marco Ik1HSS

----Messaggio originale----
Da: selberdenken@posteo.de
Data: 7-feb-2019 19.54
A: <rsgb_lf_group@blacksheep.org>
Ogg: Re: ELF: Carrier on 22.97 Hz

...wow, after analysing the first 90 minutes of the transmission i found that the best SNR is achieved without sferic blanking! So then the hum filter and the low pass filter can be disabled too.
So far, during that noisy evening period, i'm getting about 14 dB SNR in 185 uHz.
Unfortunately i temporarely overloaded the PC while doing the analysis, which caused an interruption of the stream and then all SpecLab instances did a restart.

Now the spectrogram is generated from the unfiltered and unblanked stream and now we can already see a clear peak right on the expected frequency, showing about 10 dB SNR.

I intend to run the carrier at least for 24 hours, if all works well. Not sure if and how the antenna current will drop when it starts to rain. It would have been better to decouple the DC component from the antenna by using a big series capacitor but id didn't have one that holds 20 kV or so.

More later...

73, Stefan



Am 07.02.2019 17:05, schrieb DK7FC:
Hi ELF ;-)

I'm glad to announce that since 15:46 UTC i am transmitting on ELF (the real ELF, i.e. into the range of 3...30 Hz, ITU radio band 1 ) for the first time ever.

Here are the parameters:

TX frequency: 22.970 Hz
Wavelength of that frequency: 13060 km
Antenna voltage: 4.8 kV rms (+ a DC component of 7.5 kV)
Antenna current: 325 uA
ERP: 600 aW, or 6E-16 W

Call it QRP!
The goal is to detect the signal on my 3.5 km distant tree grabber, whose E field is now working again. Since the E field probe is not to far above the tree, the effective height is not as much as it should ideally be, at this frequency, so the RX is somewhat deaf. Anyway i can see the Schumann resonances and the 60 Hz power grid. So i hope it will work.

A spectrogram which is centered on the frequency of interest in now shown at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html (3rd window). But maybe 424 uHz FFT bin width is even to optimistic! In a few minutes we'll see more :-) It takes about 40 minutes until a peak could have fully developed...

73, Stefan



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