Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mailn.lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id uBHFenqN007298 for ; Sat, 17 Dec 2016 16:40:50 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cIH2u-0007f1-I6 for rs_out_1@blacksheep.org; Sat, 17 Dec 2016 15:37:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cIH2t-0007er-Qh for rsgb_lf_group@blacksheep.org; Sat, 17 Dec 2016 15:37:11 +0000 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cIH2p-0002y5-Sd for rsgb_lf_group@blacksheep.org; Sat, 17 Dec 2016 15:37:10 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 3C58C2008F for ; Sat, 17 Dec 2016 16:37:07 +0100 (CET) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3tgrry5Gzczyth; Sat, 17 Dec 2016 16:37:06 +0100 (CET) Message-ID: <58555BA2.7050709@posteo.de> Date: Sat, 17 Dec 2016 16:37:06 +0100 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org, Renato Romero References: <158ddfd1f0b-5980-42e@webprd-a47.mail.aol.com> <584AC31C.20803@posteo.de> <584EAB0D.4060004@posteo.de> In-Reply-To: <584EAB0D.4060004@posteo.de> X-Scan-Signature: 160666a84ef5d9af0d8f07b52ab8f793 Subject: Re: ULF: Finally 100 mA on 2.97 kHz / 65 km ULF experiment / summary Content-Type: multipart/alternative; boundary="------------020704060005010005040509" 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 X-Scanned-By: MIMEDefang 2.75 Status: O X-Status: X-Keywords: X-UID: 9813 This is a multi-part message in MIME format. --------------020704060005010005040509 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi ULF, In addition to the informations from older mails about this experiment, here are the results of the post-processing: First, a spectrogram in 424 uHz FFT bin width (after sferic blanking) showing the whole transmission: https://dl.dropboxusercontent.com/u/19882028/ULF/65km_424uHz.jpg The SNR reached levels up to 22 dB. Even during the (relatively) strong QRN periods at night, the transmissions are still visible. Even the EbNaut transmissions were visible. All this is about 10 dB stronger than i expected. The low winter noise levels and the quiet location certainly plays a big role here. The 'short' DFCW-10800 (3h per element) message "FC" is O copy as the experts say. Inbetween the "F" and "C" there is an EbNaut message (#2) with the content "73". One more example showing the power of EbNaut. In the last experiments i've shown reference spactrograms beeing generated in low distance (tree grabber) just to give a better overview of what was transmitted, but this is not necessary here :-) 3 EbNaut messages were transmitted. All of them have been decoded with a strong SNR: 1st message: https://dl.dropboxusercontent.com/u/19882028/ULF/65km_EbNaut_2970Hz_Message1.png 2nd message: https://dl.dropboxusercontent.com/u/19882028/ULF/65_EbNaut_2970Hz_Message2.png 3rd message: https://dl.dropboxusercontent.com/u/19882028/ULF/65km_EbNaut_2970Hz_Message3.png Last but not least a spectrogram showing the recorded range from 0...12 kHz, without a noise blanker: https://dl.dropboxusercontent.com/u/19882028/ULF/65km_wide.jpg A new experiment in 140 km distance is in the pipeline. The plan is to run it in 2016. 73, Stefan Am 12.12.2016 14:50, schrieb DK7FC: > Hi ULF, > > More news from the latest experiment on the 101 km band with QRB ~ 65 km. > Yesterday i have been in *JN39VH41HL* > again and took all > the equipment of this ULF experiment home again. > Everything has still been there and in its right place, which was the > first good message. Here's an image showing the coupling of the loop > antenna, 2 turns primary and about 200 turns secondary on a big > ferrite core: > https://dl.dropboxusercontent.com/u/19882028/ULF/20161211_123535.jpg > > Even the audio recording process was still running but the USB stick > was almost full. Now i have saved a 29.7 GB raw file containing the > audio data for post processing. This recording is almost 4 days long. > 2 SpecLab instances are now running to produce spectrograms in 424 uHz > FFT bin width and 10 minute per pixel scroll rate, using a noise > blanker and a 4 kHz wide filter centered on 2970 Hz. > > The accus (5x 7 Ah lead gel) were discharged to 12.17V, > https://dl.dropboxusercontent.com/u/19882028/ULF/20161211_123758.jpg, > so it was the right choice to use these 5 accus. > > The single turn vertical loop circumference is about 45m out of > 1.5mm^2 cu wire and the captured area is about 70 m^2. > > Now, while writing this mail, the first pixels are coming in. So far > the result is looking very very good, the SNR seems to be arround 20 > dB, much more than expected! See attachment. I will write a summary > when all the spectrograms and eventual EbNaut decodes are available. > But in the moment it looks most promising that i successfully crossed > 65 km distance on the 101 km band, which was the goal. This is the > path:* http://no.nonsense.ee/qth/map.html?qth=JN39VH41HL&from=jn49ik00wd > > *73, Stefan/DK7FC* > * > > Am 09.12.2016 15:43, schrieb DK7FC: >> After doing a lot of modifications here on the TX side, the effect >> still exists. I can't get rid of the unstable phase shown on the VLF >> tree grabber. >> >> One thing to mention is that the phase seems to change slowly, no >> sudden phase jumps. Thus the peak is 40 dB S/N in 47 uHz. So >> obviously there were much less uncorrected phase glitches than >> expected in the first moment when i saw the effect. >> >> Just to be sure i downgraded to the last SpecLab version, the one i >> used since the last month. But the effect still exists. >> >> Next to note is the i never saw the effect in my last tests. I still >> have captures showing a very clear trace on 2970 Hz during the 31 km >> experiment. OK that was in September. The QRN levels may have been a >> bit higher and the signal was 7 dB weaker. So maybe the effect was >> just hidden in the noise? >> >> Next i found that some SpecLab configurations seem to be corrupted by >> forth and back installing old (V2.90b2) and new (V2.92b2) version. So >> i am now using the old version and a config file that was never >> opened in the new version. It all seems to work fine on the TX side >> but i can still see the effect. BTW i even disabled the NB and >> checked if this makes a change. But thill the same result. >> >> The _TX schedule for the experiment_ is: >> *07.DEC*: TX 2970.000 Hz (antenna current between 105...110 mA all >> the time) since 13:30 UTC. The recording has started about 15 UTC. >> >> *08.DEC*: EbNaut 5ch, 80s, 8K19A @ 2970.000 Hz starting 7 UTC, ending >> 18:22:40 UTC. Then, carrier at 2970.000 Hz. Some interruptions >> happened in the late carrier. >> >> *09.DEC*: 0 UTC starting DFCW-10800 (3h per element), 'dit' at >> 2969.9975 Hz, 'dah' at 2970.000 Hz. The message is 'FC'. Between F >> and C there is a break of 7 hours. In this time, starting 15 UTC: >> EbNaut 2ch, 68s, 8K19A @2970.000 Hz. >> >> *10.DEC*: End of DFCW message 'FC' at 13 UTC. Then, EbNaut 5ch, 80s, >> 8K19A @ 2970.000 Hz starting 13 UTC (repetition of the message of >> 08.DEC.) >> >> *11.DEC: *End of EbNaut message at 0:22:40 UTC. Then, carrier on >> 2970.000 Hz until 20 UTC. The recording will stopp in the late >> morning, due to space limitations of the 32 GB USB-stick. >> >> From the local recording i tried to decode the 5ch EbNaut message. >> But it didn't decode. I just got a '*****' message and a false >> decode. This is strange. The dots are quite concentrated in the two >> horizontal lines which indicates a stable phase. See attachment. Also >> the signal peak is strong and narrow. But in the red field there is >> nothing to see... This EbNaut message was transmitted with the new >> PSK config in SL. It is the reason why i will repeat the message in >> the end of the experiment again, using the old settings and version. >> >> I should have done more pre-tests before starting the experiment. But >> now it is running. Well, the main goal is to detect a clear trace of >> my signal in a spectrogram running at 300 uHz or so. The signals do >> not look bad on the local grabber, not at all, despite the strange >> (propagation?) effect. I'm still optimistic... >> >> 73, Stefan >>> --------------020704060005010005040509 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi ULF,

In addition to the informations from older mails about this experiment, here are the results of the post-processing:

First, a spectrogram in 424 uHz FFT bin width (after sferic blanking) showing the whole transmission: https://dl.dropboxusercontent.com/u/19882028/ULF/65km_424uHz.jpg
The SNR reached levels up to 22 dB. Even during the (relatively) strong QRN periods at night, the transmissions are still visible. Even the EbNaut transmissions were visible. All this is about 10 dB stronger than i expected. The low winter noise levels and the quiet location certainly plays a big role here. The 'short' DFCW-10800 (3h per element) message "FC" is O copy as the experts say. Inbetween the "F" and "C" there is an EbNaut message (#2) with the content "73". One more example showing the power of EbNaut.
In the last experiments i've shown reference spactrograms beeing generated in low distance (tree grabber) just to give a better overview of what was transmitted, but this is not necessary here :-)

3 EbNaut messages were transmitted. All of them have been decoded with a strong SNR:
1st message: https://dl.dropboxusercontent.com/u/19882028/ULF/65km_EbNaut_2970Hz_Message1.png
2nd message: https://dl.dropboxusercontent.com/u/19882028/ULF/65_EbNaut_2970Hz_Message2.png
3rd message: https://dl.dropboxusercontent.com/u/19882028/ULF/65km_EbNaut_2970Hz_Message3.png

Last but not least a spectrogram showing the recorded range from 0...12 kHz, without a noise blanker: https://dl.dropboxusercontent.com/u/19882028/ULF/65km_wide.jpg

A new experiment in 140 km distance is in the pipeline. The plan is to run it in 2016.

73, Stefan




Am 12.12.2016 14:50, schrieb DK7FC:
Hi ULF,

More news from the latest experiment on the 101 km band with QRB ~ 65 km.
Yesterday i have been in JN39VH41HL again and took all the equipment of this ULF experiment home again.
Everything has still been there and in its right place, which was the first good message. Here's an image showing the coupling of the loop antenna, 2 turns primary and about 200 turns secondary on a big ferrite core: https://dl.dropboxusercontent.com/u/19882028/ULF/20161211_123535.jpg

Even the audio recording process was still running but the USB stick was almost full. Now i have saved a 29.7 GB raw file containing the audio data for post processing. This recording is almost 4 days long. 2 SpecLab instances are now running to produce spectrograms in 424 uHz FFT bin width and 10 minute per pixel scroll rate, using a noise blanker and a 4 kHz wide filter centered on 2970 Hz.

The accus (5x 7 Ah lead gel) were discharged to 12.17V, https://dl.dropboxusercontent.com/u/19882028/ULF/20161211_123758.jpg, so it was the right choice to use these 5 accus.

The single turn vertical loop circumference is about 45m out of 1.5mm^2 cu wire and the captured area is about 70 m^2.

Now, while writing this mail, the first pixels are coming in. So far the result is looking very very good, the SNR seems to be arround 20 dB, much more than expected! See attachment. I will write a summary when all the spectrograms and eventual EbNaut decodes are available. But in the moment it looks most promising that i successfully crossed 65 km distance on the 101 km band, which was the goal. This is the path: http://no.nonsense.ee/qth/map.html?qth=JN39VH41HL&from=jn49ik00wd

73, Stefan/DK7FC


Am 09.12.2016 15:43, schrieb DK7FC:
After doing a lot of modifications here on the TX side, the effect still exists. I can't get rid of the unstable phase shown on the VLF tree grabber.

One thing to mention is that the phase seems to change slowly, no sudden phase jumps. Thus the peak is 40 dB S/N in 47 uHz. So obviously there were much less uncorrected phase glitches than expected in the first moment when i saw the effect.

Just to be sure i downgraded to the last SpecLab version, the one i used since the last month. But the effect still exists.

Next to note is the i never saw the effect in my last tests. I still have captures showing a very clear trace on 2970 Hz during the 31 km experiment. OK that was in September. The QRN levels may have been a bit higher and the signal was 7 dB weaker. So maybe the effect was just hidden in the noise?

Next i found that some SpecLab configurations seem to be corrupted by forth and back installing old (V2.90b2) and new (V2.92b2) version. So i am now using the old version and a config file that was never opened in the new version. It all seems to work fine on the TX side but i can still see the effect. BTW i even disabled the NB and checked if this makes a change. But thill the same result.

The TX schedule for the experiment is:
07.DEC: TX 2970.000 Hz (antenna current between 105...110 mA all the time) since 13:30 UTC. The recording has started about 15 UTC.

08.DEC: EbNaut 5ch, 80s, 8K19A @ 2970.000 Hz starting 7 UTC, ending 18:22:40 UTC. Then, carrier at 2970.000 Hz. Some interruptions happened in the late carrier.

09.DEC: 0 UTC starting DFCW-10800 (3h per element), 'dit' at 2969.9975 Hz, 'dah' at  2970.000 Hz. The message is 'FC'. Between F and C there is a break of 7 hours. In this time, starting 15 UTC: EbNaut 2ch, 68s, 8K19A @2970.000 Hz.

10.DEC: End of DFCW message 'FC' at 13 UTC. Then, EbNaut 5ch, 80s, 8K19A @ 2970.000 Hz starting 13 UTC (repetition of the message of 08.DEC.)

11.DEC: End of EbNaut message at 0:22:40 UTC. Then, carrier on 2970.000 Hz until 20 UTC. The recording will stopp in the late morning, due to space limitations of the 32 GB USB-stick.

>From the local recording i tried to decode the 5ch EbNaut message. But it didn't decode. I just got a '*****' message and a false decode. This is strange. The dots are quite concentrated in the two horizontal lines which indicates a stable phase. See attachment. Also the signal peak is strong and narrow. But in the red field there is nothing to see... This EbNaut message was transmitted with the new PSK config in SL. It is the reason why i will repeat the message in the end of the experiment again, using the old settings and version.

I should have done more pre-tests before starting the experiment. But now it is running. Well, the main goal is to detect a clear trace of my signal in a spectrogram running at 300 uHz or so. The signals do not look bad on the local grabber, not at all, despite the strange (propagation?) effect. I'm still optimistic...

73, Stefan

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