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: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v45GdZqZ019242 for ; Fri, 5 May 2017 18:39:36 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d6g9i-0000qz-4i for rs_out_1@blacksheep.org; Fri, 05 May 2017 17:32:34 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d6g9h-0000qq-6t for rsgb_lf_group@blacksheep.org; Fri, 05 May 2017 17:32:33 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1d6g9b-0001M5-2O for rsgb_lf_group@blacksheep.org; Fri, 05 May 2017 17:32:31 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 281A520C50 for ; Fri, 5 May 2017 18:32:24 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3wKHVc1l0Rz104L for ; Fri, 5 May 2017 18:32:24 +0200 (CEST) Message-ID: <590CA917.70808@posteo.de> Date: Fri, 05 May 2017 18:32:23 +0200 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" References: <15bd53dda31-14f8-1cb1c@webprd-m59.mail.aol.com> <590B9892.9010406@posteo.de> <1493995971.279577405@f347.i.mail.ru> In-Reply-To: <1493995971.279577405@f347.i.mail.ru> X-Scan-Signature: 5624f0ff3acda0934438723229c028ec Subject: Re: VLF: tonite on the 36km band... Content-Type: multipart/alternative; boundary="------------090802000003010107090102" 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: RO X-Status: X-Keywords: X-UID: 11597 This is a multi-part message in MIME format. --------------090802000003010107090102 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello Alex, Many thanks for your results! This is very interesting. A very good result for May over that 1990 km landpath! It was not really a quiet night :-) I can see the QRN situation on the RC4HAA VLF grabber (http://136.su/grabber/). I did not expect a decode from you because because i had to restart the transmission later, 3 hours after the optimal time. No false decodes despite the low CRC value, must be due to the lower list length. Paul seems to be right ;-) I will continue with tests of low CRC values. We are impressingly close to the limit! Let me try tonite: *f = 8270.100000 Hz Start time: 05.May.2017 18:00:00 UTC Symbol period: 40 s Characters: 4 CRC bits: 6 Coding 16K21A Duration: 8h, 53m, 20s Antenna current: 670 mA* (Set list length to: *74* in the first run) With 4 characters, it becomes easier to filter out false decodes by the human decoder stage. 73, Stefan Am 05.05.2017 16:52, schrieb Alex K: > Hello Stefan, VLF! > The 3-char transmission was decoded here in nr Moscow without false > decodes! > > ebnaut-rx V0.5 > input file C:\EbNaut\VLF_EBNAUT\EbNaut\ebnaut04_MAY_2336_8270-1pps.wav > sample rate 0.342935 per second > rx frequency 8270.1 > file start time 2017-05-04 16:58:49.600 > polynomial 16K21A > crc size 8 > number of chars 3 > block size 26 > symbol period 40.000 > number of symbols 736 > list length 250 > start offset 14482.364 > freq offset 0.000000 > cores 1 > skipped 14483.790082 seconds to start > initial reference phase 10.6 > --------------------------------------------- > found VLF > list rank 104 > reference phase 0 0 0 0 > carrier RMS 5.045e-005 noise RMS 1.340e-005 > carrier S/N 11.52 dB in 34.0 uHz > carrier Es/N0 -17.15 dB > carrier Eb/N0 -0.81 dB > info bit period 1721.64 seconds > symbol error rate 315/736 = 42.799 % > Es/N0 from symbol errors -17.8 dB > Eb/N0 from symbol errors -1.5 dB > Shannon capacity 2.5 bits/hour > Shannon efficiency 84.4 % > symbols file > C:\EbNaut\VLF_EBNAUT\EbNaut\ebnaut04_MAY_2336_8270-1pps-symbols.csv > elapsed 10 seconds > --------------------------------------------- > found VLF > list rank 43 > reference phase 0 0 -30 -30 > carrier RMS 5.402e-005 noise RMS 1.340e-005 > carrier S/N 12.11 dB in 34.0 uHz > carrier Es/N0 -16.56 dB > carrier Eb/N0 -0.22 dB > info bit period 1721.64 seconds > symbol error rate 322/736 = 43.750 % > Es/N0 from symbol errors -19.0 dB > Eb/N0 from symbol errors -2.7 dB > Shannon capacity 2.8 bits/hour > Shannon efficiency 73.7 % > symbols file > C:\EbNaut\VLF_EBNAUT\EbNaut\ebnaut04_MAY_2336_8270-1pps-symbols.csv > elapsed 170 seconds > > > Files for reprocessing: > http://rn3aus.narod.ru/ebnaut-04may2017-2100-8270.zip > > 73 de rn3aus/Alex > > Пятница, 5 мая 2017, 0:12 +03:00 от DK7FC : > > > > Am 04.05.2017 22:54, schrieb Markus Vester: >> > The 3 char transmission for tonite failed. >> >> Pity. Do you want to try again later tonight? That would probably >> imply rescheduling the following daytime sequence as well. > Exactly! > Update: > * > f = 8270.100000 Hz > Start time: 04.May.2017 21:00:00 UTC > Symbol period: 40 s > Characters: 3 > CRC bits: 8 > Coding 16K21A > Duration: 8h, 10m, 40s > Antenna current: 670 mA* > (Set list length to: *239* in the first run) > This is an experiment using a low CRC value which gives a lower > optimum list length. Let's see if it produces to many false decodes. > > > Probably that's a transmission for Paul only: > > *f = 8270.100000 Hz > Start time: 05.May.2017 05:30:00 UTC > Symbol period: 10 s > Characters: 100 > CRC bits: 0 > Coding 8K19A > Duration: 13h, 44min > Antenna current: 670 mA* > > > >> >> > The fan has blown itselfe from the table >> >> Wow, you might end up using that fan as a helicopter to raise the >> antenna ;-) > Again, exactly! Because that may become necessary in the future. > They are planning a safety inpection for July this year! In the > worst case it will be the end of this setup here. So i'm pallning > for any eventualities: http://www.xxl-modellbau.de/Multicopter_2 > A good new project anyway... > > 73, Stefan > > --------------090802000003010107090102 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hello Alex,

Many thanks for your results! This is very interesting. A very good result for May over that 1990 km landpath! It was not really a quiet night :-) I can see the QRN situation on the RC4HAA VLF grabber (http://136.su/grabber/).
I did not expect a decode from you because because i had to restart the transmission later, 3 hours after the optimal time.
No false decodes despite the low CRC value, must be due to the lower list length. Paul seems to be right ;-) I will continue with tests of low CRC values.
We are impressingly close to the limit!

Let me try tonite:

f = 8270.100000 Hz
Start time: 05.May.2017   18:00:00 UTC
Symbol period: 40 s
Characters: 4
CRC bits: 6
Coding 16K21A
Duration: 8h, 53m, 20s
Antenna current: 670 mA
(Set list length to: 74 in the first run)

With 4 characters, it becomes easier to filter out false decodes by the human decoder stage.

73, Stefan



Am 05.05.2017 16:52, schrieb Alex K:
Hello Stefan, VLF!
The 3-char transmission was decoded here in nr Moscow without false decodes!

ebnaut-rx V0.5
input file C:\EbNaut\VLF_EBNAUT\EbNaut\ebnaut04_MAY_2336_8270-1pps.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-05-04 16:58:49.600
polynomial 16K21A
crc size 8
number of chars 3
block size 26
symbol period 40.000
number of symbols 736
list length 250
start offset 14482.364
freq offset 0.000000
cores 1
skipped 14483.790082 seconds to start
initial reference phase 10.6
---------------------------------------------
found VLF
list rank 104
reference phase    0    0    0    0
carrier RMS 5.045e-005 noise RMS 1.340e-005
carrier S/N 11.52 dB in 34.0 uHz
carrier Es/N0 -17.15 dB
carrier Eb/N0 -0.81 dB
info bit period 1721.64 seconds
symbol error rate 315/736 = 42.799 %
Es/N0 from symbol errors -17.8 dB
Eb/N0 from symbol errors -1.5 dB
Shannon capacity 2.5 bits/hour
Shannon efficiency 84.4 %
symbols file C:\EbNaut\VLF_EBNAUT\EbNaut\ebnaut04_MAY_2336_8270-1pps-symbols.csv
elapsed 10 seconds
---------------------------------------------
found VLF
list rank 43
reference phase    0    0  -30  -30
carrier RMS 5.402e-005 noise RMS 1.340e-005
carrier S/N 12.11 dB in 34.0 uHz
carrier Es/N0 -16.56 dB
carrier Eb/N0 -0.22 dB
info bit period 1721.64 seconds
symbol error rate 322/736 = 43.750 %
Es/N0 from symbol errors -19.0 dB
Eb/N0 from symbol errors -2.7 dB
Shannon capacity 2.8 bits/hour
Shannon efficiency 73.7 %
symbols file C:\EbNaut\VLF_EBNAUT\EbNaut\ebnaut04_MAY_2336_8270-1pps-symbols.csv
elapsed 170 seconds


Files for reprocessing:
http://rn3aus.narod.ru/ebnaut-04may2017-2100-8270.zip

73 de rn3aus/Alex

Пятница, 5 мая 2017, 0:12 +03:00 от DK7FC <selberdenken@posteo.de>:



Am 04.05.2017 22:54, schrieb Markus Vester:
> The 3 char transmission for tonite failed.

Pity. Do you want to try again later tonight? That would probably imply rescheduling the following daytime sequence as well.
Exactly!
Update:

f = 8270.100000 Hz
Start time: 04.May.2017   21:00:00 UTC
Symbol period: 40 s
Characters: 3
CRC bits: 8
Coding 16K21A
Duration: 8h, 10m, 40s
Antenna current: 670 mA
(Set list length to: 239 in the first run)
This is an experiment using a low CRC value which gives a lower optimum list length. Let's see if it produces to many false decodes.


Probably that's a transmission for Paul only:

f = 8270.100000 Hz
Start time: 05.May.2017   05:30:00 UTC
Symbol period: 10 s
Characters: 100
CRC bits: 0
Coding 8K19A
Duration: 13h, 44min
Antenna current: 670 mA




> The fan has blown itselfe from the table

Wow, you might end up using that fan as a helicopter to raise the antenna ;-)
Again, exactly! Because that may become necessary in the future. They are planning a safety inpection for July this year! In the worst case it will be the end of this setup here. So i'm pallning for any eventualities: http://www.xxl-modellbau.de/Multicopter_2
A good new project anyway...

73, Stefan


--------------090802000003010107090102--