Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,HTML_TITLE_EMPTY,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t8PAJ8g9028544 for ; Fri, 25 Sep 2015 12:19:08 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZfQ2p-0003vs-Vs for rs_out_1@blacksheep.org; Fri, 25 Sep 2015 11:15:59 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZfQ2p-0003vc-5F for rsgb_lf_group@blacksheep.org; Fri, 25 Sep 2015 11:15:59 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1ZfQ1g-0006gN-CO for rsgb_lf_group@blacksheep.org; Fri, 25 Sep 2015 11:15:58 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 7422820950 for ; Fri, 25 Sep 2015 12:14:32 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3nMpy02kSlz5vN4 for ; Fri, 25 Sep 2015 12:14:32 +0200 (CEST) Message-ID: <56051E88.80205@posteo.de> Date: Fri, 25 Sep 2015 12:14:32 +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: <0MNdxu-1Zl3vu0oLy-007AvH@mail.gmx.com> <5603CC31.2000401@posteo.de> <560508B4.6000303@posteo.de> <56051B64.8080200@posteo.de> In-Reply-To: <56051B64.8080200@posteo.de> X-Scan-Signature: ebcef237b0394d499a293e835099e25a Subject: Re: LF: First MF TA since a longer time Content-Type: multipart/alternative; boundary="------------050600010804020505010403" 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 4139 This is a multi-part message in MIME format. --------------050600010804020505010403 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit PS: So let's assume you can do QSOs down to -9 dB in 2500 Hz, reasonable comfortable (i mean real QSOs, with some content except "5nn JN49 tu", i.e. not just a test. Or an always repeating NDB call in slow CW). Then you see that WSPR decodes about 20 dB lower. Good for DX experiments and propagation studies and for radiating some RF when beeing outside the shack... 73, Stefan Am 25.09.2015 12:01, schrieb DK7FC: > Hello Fausto, > > Good quastion! I've made a quick test and reduced my TX power so i can > receive me in my garden at -6 dB SNR. I then switched to CW and > recorde a wav file. So the background noise is real (not coming from a > signal generator), but it's daytime noise... > Listen: > https://dl.dropboxusercontent.com/u/19882028/MF/CW%20bei%20-6dB%20WSPR_AF.WAV > The first half is at -6 dB, the second at -16 dB (in 2500 Hz). > So, the first part is how John/W1TAG would have heared me last night > :-) It is no problem for a CW QSO. The seconds part is barely audible > but very hard to understand. You could say "i hear you but i cannot > read you"... > > But the thing is that such good propagation is VERY (!!) rare! The > chance is very small that you can make a sked and get such a good > propagation just during the time you want to make a QSO. December or > January is the best time for attempts i think. But you will need a > good antenna and loads of power :-) > > 73, Stefan > > Am 25.09.2015 11:00, schrieb Fausto Coletti: >> Hi Stefan, >> a wspr -6dB sgnal is audible ? >> The question is this: with this condition and if necessary a bit more >> power it is possible a cw qso? >> 73, Fausto IK4NMF >> ----- Original Message ----- >> >> *From:* DK7FC >> *To:* rsgb_lf_group@blacksheep.org >> >> *Sent:* Friday, September 25, 2015 10:41 AM >> *Subject:* Re: LF: First MF TA since a longer time >> >> Hi all, >> >> Last night there were excellent condx on 630m on the TA path! >> G8HUH, F5WK and DK7FC managed to be decoded in above 5000 km in WSPR. >> >> I've got exceptional good SNR reports!: >> >> Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az >> 2015-09-25 04:52 DK7FC 0.475683 -23 0 JN49ik 1 >> WG2XKA FN33lq 5970 297 >> 2015-09-25 04:32 DK7FC 0.475683 -16 0 JN49ik 1 >> WD2XSH/17 FN42pb 5927 294 >> 2015-09-25 04:32 DK7FC 0.475684 -6 0 JN49ik 1 >> W1TAG/1 FN43sv 5789 296 >> 2015-09-25 00:32 DK7FC 0.475683 -5 0 JN49ik 1 >> TF3HZ HP94ad 2440 323 >> >> >> -6 dB by W1TAG/1 means that many weaker stations could have made >> the path as well, in that time slot! >> >> 73, Stefan >> >> Nessun virus nel messaggio. >> Controllato da AVG - www.avg.com >> Versione: 2015.0.6140 / Database dei virus: 4419/10695 - Data di >> rilascio: 25/09/2015 >> --------------050600010804020505010403 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit PS: So let's assume you can do QSOs down to -9 dB in 2500 Hz, reasonable comfortable (i mean real QSOs, with some content except "5nn JN49 tu", i.e. not just a test. Or an always repeating NDB call in slow CW). Then you see that WSPR decodes about 20 dB lower. Good for DX experiments and propagation studies and for radiating some RF when beeing outside the shack...
73, Stefan

Am 25.09.2015 12:01, schrieb DK7FC:
Hello Fausto,

Good quastion! I've made a quick test and reduced my TX power so i can receive me in my garden at -6 dB SNR. I then switched to CW and recorde a wav file. So the background noise is real (not coming from a signal generator), but it's daytime noise...
Listen: https://dl.dropboxusercontent.com/u/19882028/MF/CW%20bei%20-6dB%20WSPR_AF.WAV
The first half is at -6 dB, the second at -16 dB (in 2500 Hz).
So, the first part is how John/W1TAG would have heared me last night :-) It is no problem for a CW QSO. The seconds part is barely audible but very hard to understand. You could say "i hear you but i cannot read you"...

But the thing is that such good propagation is VERY (!!) rare! The chance is very small that you can make a sked and get such a good propagation just during the time you want to make a QSO. December or January is the best time for attempts i think. But you will need a good antenna and loads of power :-)

73, Stefan

Am 25.09.2015 11:00, schrieb Fausto Coletti:
Hi Stefan,
 
a wspr -6dB sgnal is audible ?
The question is this: with this condition and if necessary a bit more power it is possible a cw qso?
 
73, Fausto IK4NMF
 
 
----- Original Message -----
From: DK7FC
Sent: Friday, September 25, 2015 10:41 AM
Subject: Re: LF: First MF TA since a longer time

Hi all,

Last night there were excellent condx on 630m on the TA path! G8HUH, F5WK and DK7FC managed to be decoded in above 5000 km in WSPR.

I've got exceptional good SNR reports!:

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
 2015-09-25 04:52   DK7FC   0.475683   -23   0   JN49ik   1   WG2XKA   FN33lq   5970   297 
 2015-09-25 04:32   DK7FC   0.475683   -16   0   JN49ik   1   WD2XSH/17   FN42pb   5927   294 
 2015-09-25 04:32   DK7FC   0.475684   -6   0   JN49ik   1   W1TAG/1   FN43sv   5789   296 
 2015-09-25 00:32   DK7FC   0.475683   -5   0   JN49ik   1   TF3HZ   HP94ad   2440   323 

-6 dB by W1TAG/1 means that many weaker stations could have made the path as well, in that time slot!

73, Stefan

Nessun virus nel messaggio.
Controllato da AVG - www.avg.com
Versione: 2015.0.6140 / Database dei virus: 4419/10695 - Data di rilascio: 25/09/2015

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