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_FONT_SIZE_HUGE,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 v1KJMriq019171 for ; Mon, 20 Feb 2017 20:22:54 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cftUc-0008IE-MA for rs_out_1@blacksheep.org; Mon, 20 Feb 2017 19:19:26 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cftUb-0008GD-V0 for rsgb_lf_group@blacksheep.org; Mon, 20 Feb 2017 19:19:25 +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 1cftUY-0005Op-EH for rsgb_lf_group@blacksheep.org; Mon, 20 Feb 2017 19:19:24 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 2F15C20A2D for ; Mon, 20 Feb 2017 20:19:21 +0100 (CET) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3vRtjN56MHz105v for ; Mon, 20 Feb 2017 20:19:20 +0100 (CET) Message-ID: <58AB4135.6030005@posteo.de> Date: Mon, 20 Feb 2017 20:19:17 +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" References: <1487334367.396640876@f56.i.mail.ru> <58A6F8AF.70304@posteo.de> <1487606730.658057559@f282.i.mail.ru> In-Reply-To: <1487606730.658057559@f282.i.mail.ru> X-Scan-Signature: 671be81035fb274514daa81d2095bf05 Subject: Re: LF: Re[2]: LF: Re: DK7FC EbNaut message on 8270.1 Hz decoded nr Moscow by RN3AUS Content-Type: multipart/alternative; boundary="------------070705060202030601000203" 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: 10662 This is a multi-part message in MIME format. --------------070705060202030601000203 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello Alex, Wow, what a perfect result again! Congrats Alex!! And still 0.84 dB (and more) spare! We could risk some more again :-) In a few days. I like the 30 0 0 -30 reference phase. It seems to tell us something, maybe i'm starting to transmit when it's still not completely nighttime on the path and stopping when it's already daytime again? Somehow the resonance frequency of the antenna rises! I measured 8285 Hz a few days ago. Thus my antenna current dropped, i was unable to hold 700 mA, it dropped to 665 mA. Maybe the winding is slowly gliding downwards, so that the coil length becomes higher? That would at least explain the effect. So now i added another 30 turns on the coil which should correct for that. There is no sign of HV stress on the arrangement. So far i'm very satisfied with the coil design. Now, if i can run 700 mA again in the next transmission, this would lead to a 0.45 dB stronger signal relative to the 7 character message, not much but still a lot! Do you have any plans to improve things on your side? How many characters is your PC able to decode, in 16K21A and a list length of 200000? I would try 8 characters in 16K21A soon, still at 30s symbols. Thanks for all, and i'm following the Russian VLF thread on 136.su :-) 73, Stefan Am 20.02.2017 17:05, schrieb Alex K: > Hello Stefan, VLF > > ... and new decode again! > > ebnaut-rx V0.5 > input file C:\EbNaut\ebnaut19_FEB_0026_8270-1pps.wav > sample rate 0.342935 per second > rx frequency 8270.1 > file start time 2017-02-18 17:48:44.690 > polynomial 16K21A > crc size 16 > number of chars 7 > block size 58 > symbol period 30.000 > number of symbols 1248 > list length 20000 > start offset 1587.274 > freq offset 0.000000 > cores 1 > skipped 1586.306443 seconds to start > initial reference phase 8.5 > --------------------------------------------- > found DREAMER > list rank 5 > reference phase 0 0 0 0 > carrier RMS 3.002e-005 noise RMS 4.463e-006 > carrier S/N 16.56 dB in 26.7 uHz > carrier Es/N0 -14.41 dB > carrier Eb/N0 0.55 dB > info bit period 938.35 seconds > symbol error rate 508/1248 = 40.705 % > Es/N0 from symbol errors -15.5 dB > Eb/N0 from symbol errors -0.5 dB > Shannon capacity 6.2 bits/hour > Shannon efficiency 62.2 % > symbols file C:\EbNaut\ebnaut19_FEB_0026_8270-1pps-symbols.csv > elapsed 10 seconds > --------------------------------------------- > found DREAMER > list rank 9 > reference phase 30 30 0 0 > carrier RMS 3.106e-005 noise RMS 4.463e-006 > carrier S/N 16.85 dB in 26.7 uHz > carrier Es/N0 -14.11 dB > carrier Eb/N0 0.84 dB > info bit period 938.35 seconds > symbol error rate 495/1248 = 39.663 % > Es/N0 from symbol errors -14.6 dB > Eb/N0 from symbol errors 0.4 dB > Shannon capacity 6.6 bits/hour > Shannon efficiency 58.2 % > symbols file C:\EbNaut\ebnaut19_FEB_0026_8270-1pps-symbols.csv > elapsed 128 seconds > --------------------------------------------- > found *DREAMER* > list rank 0 > reference phase 30 0 0 -30 > carrier RMS 3.106e-005 noise RMS 4.463e-006 > carrier *S/N 16.85 dB in 26.7 uHz* > carrier Es/N0 -14.11 dB > carrier *Eb/N0 0.84 dB* > info bit period 938.35 seconds > symbol error rate 493/1248 = 39.503 % > Es/N0 from symbol errors -14.5 dB > Eb/N0 from symbol errors 0.5 dB > Shannon capacity 6.6 bits/hour > Shannon efficiency 58.2 % > symbols file C:\EbNaut\ebnaut19_FEB_0026_8270-1pps-symbols.csv > elapsed 531 seconds > > > > Let's risk something more again and try: > > *f = 8270.100000 Hz > Start time: Saturday 18.Feb.2017 18:00:00 UTC > Symbol period: 30 s > Characters: 7 > CRC bits: 16 > Coding 16K21A > Duration: 10h, 24m, 0s > Antenna current: 700 mA* > > > 73, Stefan > > > --------------070705060202030601000203 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hello Alex,

Wow, what a perfect result again! Congrats Alex!! And still 0.84 dB (and more) spare! We could risk some more again :-) In a few days.

I like the 30  0  0  -30 reference phase. It seems to tell us something, maybe i'm starting to transmit when it's still not completely nighttime on the path and stopping when it's already daytime again?

Somehow the resonance frequency of the antenna rises! I measured 8285 Hz a few days ago. Thus my antenna current dropped, i was unable to hold 700 mA, it dropped to 665 mA. Maybe the winding is slowly gliding downwards, so that the coil length becomes higher? That would at least explain the effect. So now i added another 30 turns on the coil which should correct for that. There is no sign of HV stress on the arrangement. So far i'm very satisfied with the coil design. Now, if i can run 700 mA again in the next transmission, this would lead to a 0.45 dB stronger signal relative to the 7 character message, not much but still a lot!

Do you have any plans to improve things on your side?
How many characters is your PC able to decode, in 16K21A and a list length of 200000?
I would try 8 characters in 16K21A soon, still at 30s symbols.

Thanks for all, and i'm following the Russian VLF thread on 136.su :-)

73, Stefan
 

Am 20.02.2017 17:05, schrieb Alex K:
Hello Stefan, VLF

... and new decode again!

ebnaut-rx V0.5
input file C:\EbNaut\ebnaut19_FEB_0026_8270-1pps.wav
sample rate 0.342935 per second
rx frequency 8270.1
file start time 2017-02-18 17:48:44.690
polynomial 16K21A
crc size 16
number of chars 7
block size 58
symbol period 30.000
number of symbols 1248
list length 20000
start offset 1587.274
freq offset 0.000000
cores 1
skipped 1586.306443 seconds to start
initial reference phase 8.5
---------------------------------------------
found DREAMER
list rank 5
reference phase    0    0    0    0
carrier RMS 3.002e-005 noise RMS 4.463e-006
carrier S/N 16.56 dB in 26.7 uHz
carrier Es/N0 -14.41 dB
carrier Eb/N0 0.55 dB
info bit period 938.35 seconds
symbol error rate 508/1248 = 40.705 %
Es/N0 from symbol errors -15.5 dB
Eb/N0 from symbol errors -0.5 dB
Shannon capacity 6.2 bits/hour
Shannon efficiency 62.2 %
symbols file C:\EbNaut\ebnaut19_FEB_0026_8270-1pps-symbols.csv
elapsed 10 seconds
---------------------------------------------
found DREAMER
list rank 9
reference phase   30   30    0    0
carrier RMS 3.106e-005 noise RMS 4.463e-006
carrier S/N 16.85 dB in 26.7 uHz
carrier Es/N0 -14.11 dB
carrier Eb/N0 0.84 dB
info bit period 938.35 seconds
symbol error rate 495/1248 = 39.663 %
Es/N0 from symbol errors -14.6 dB
Eb/N0 from symbol errors 0.4 dB
Shannon capacity 6.6 bits/hour
Shannon efficiency 58.2 %
symbols file C:\EbNaut\ebnaut19_FEB_0026_8270-1pps-symbols.csv
elapsed 128 seconds
---------------------------------------------
found DREAMER
list rank 0
reference phase   30    0    0  -30
carrier RMS 3.106e-005 noise RMS 4.463e-006
carrier S/N 16.85 dB in 26.7 uHz
carrier Es/N0 -14.11 dB
carrier Eb/N0 0.84 dB
info bit period 938.35 seconds
symbol error rate 493/1248 = 39.503 %
Es/N0 from symbol errors -14.5 dB
Eb/N0 from symbol errors 0.5 dB
Shannon capacity 6.6 bits/hour
Shannon efficiency 58.2 %
symbols file C:\EbNaut\ebnaut19_FEB_0026_8270-1pps-symbols.csv
elapsed 531 seconds



Let's risk something more again and try:

f = 8270.100000 Hz
Start time: Saturday 18.Feb.2017   18:00:00 UTC
Symbol period: 30 s
Characters: 7
CRC bits: 16
Coding 16K21A
Duration: 10h, 24m, 0s
Antenna current: 700 mA


73, Stefan



--------------070705060202030601000203--