Return-Path: X-Spam-DCC: paranoid 1169; 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=-2.5 required=5.0 tests=BAYES_00,FORGED_RCVD_HELO, HTML_MESSAGE autolearn=unavailable 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 t01LQdq0031109 for ; Thu, 1 Jan 2015 22:26:39 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y6nAf-0006QT-4r for rs_out_1@blacksheep.org; Thu, 01 Jan 2015 21:20:41 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y6nAe-0006QG-Ol for rsgb_lf_group@blacksheep.org; Thu, 01 Jan 2015 21:20:40 +0000 Received: from mail14.primus.ca ([216.254.141.181] helo=mail-01.primus.ca) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1Y6nAZ-00046a-T8 for rsgb_lf_group@blacksheep.org; Thu, 01 Jan 2015 21:20:39 +0000 Received: from dyn-dsl-bb-98-124-1-123.nrtco.net ([98.124.1.123] helo=Bigmachine.magma.ca) by mail-01.primus.ca with esmtpa (Exim 4.84) (envelope-from ) id 1Y6nAX-0002Z2-2g for rsgb_lf_group@blacksheep.org; Thu, 01 Jan 2015 16:20:34 -0500 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 01 Jan 2015 16:20:39 -0500 To: rsgb_lf_group@blacksheep.org From: Bill de Carle In-Reply-To: <54A58780.2040801@gmail.com> References: <54A48F01.40804@gmx.de> <54A56FF1.9060504@gmail.com> <54A58780.2040801@gmail.com> Mime-Version: 1.0 X-Authenticated: ve2iq - dyn-dsl-bb-98-124-1-123.nrtco.net (Bigmachine.magma.ca) [98.124.1.123] X-HELO-Warning: Remote host 216.254.141.181 (mail14.primus.ca) used invalid HELO/EHLO mail-01.primus.ca - verification failed X-Scan-Signature: 3df6620ae1cf83b986cf2fc02407da16 Message-Id: Subject: Re: LF: 8 dB sensitivity improvement on DK7FC's LF RX/grabber. Activity please Content-Type: multipart/alternative; boundary="=====================_9398223==.ALT" 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: 1708 --=====================_9398223==.ALT Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: quoted-printable I'll leave the grabber on: http://www.magma.ca/~ve2iq/grabs Bill, VE2IQ At 12:44 PM 1/1/2015, Stefan DK7FC wrote: >Hi Warren, > >Nice. Yes i am interested. The window is clear,=20 >see=20 >htt= p://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_LF_DX_Grabber.html=C2=20 >(in the moment i have a QSO with DF6NM, thus the=20 >RX is overloaded but tonite it will be clean). > >73, Stefan > > >Am 01.01.2015 18:35, schrieb Warren Ziegler: >>Stefan, >>=C2 >>=C2 =C2 =C2 Excellent work ! >>Is the T/A window around 137.78 clear? >>I can transmit QRSS tonite if you are interested. >>=C2 >>=C2 >>73 Warren >>=C2 >> >>On Thu, Jan 1, 2015 at 11:04 AM, DK7FC=20 >><73dk7fc@googlemail.com> wrote: >>Hi LF, >> >>Happy new year to all over the world! >> >>In the afternoon i have done some maintenance=20 >>on the LF/MF grabber PC. Deleted about 1=20 >>million jpg files (> 100 GB) and adjusted the=20 >>brightness settings for the grabber displays.=20 >>It is active again now with mch improved=20 >>sensitivity. In the afternoon the wideband=20 >>grabber window show clearly that most of the=20 >>residual man made noise is now coming from=20 >>DCF39 and HGA22. 136.5 kHz is clearly the best frequency for CW. >> >> >From the 2 seconds long daily breaks while=20 >> DLF on 153 kHz switched from 500 kW to 250 kW=20 >> at 19:59:58 local time i know that there will=20 >> be a fignificant reduction of my background noise level on LF/137 kHz. >> >>Now it turns out that there is an improvement of 8 dB on LF!!! >>On MF there is nearly no change, just a small=20 >>QRM trace disappeared. Average background noise=20 >>is the same. LF and MF is using the same active antenna frontend! >>On VLF (separate antenna) there is no significant change. >> >>Here is a complation of images showing the=20 >>differences before and after the closure of=20 >>DLF/153kHz:=20 >>https://www.dropbox.com/sh/y6vccbmn9z9= v97g/AACTB7MCUVxOfYK0PXtVX1A5a?dl=3D0#lh:null-01_3_31.DEC_23.30UTC.jpg >>Unfortunately i forgot to stop my MF WSPR=20 >>transmission over the night so there may show some QRM on each 10th= minute. >> >>Now, this night i will watch/receive on LF and=20 >>am asking for LF stations to transmit,=20 >>especially the far Russian and TA stations.=20 >>Let's make it an active night while am silent=20 >>(exceptionally :-) ). In the evening i am trying to make some QSOs... >> >>Let us make a sked for a LF CW test on the=20 >>weekend, maybe on 10 UTC on 136.5 kHz. Anyone interested, e.g. DK1IS? >> >>73, Stefan/DK7FC >> >> >> >> >>-- >>73 Warren K2ORS >>=C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 WD2XGJ >>=C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 WD2XSH/23 >>=C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 WE2XEB/2 >>=C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 WE2XGR/1 >> >>=C2 --=====================_9398223==.ALT Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'll leave the grabber on: http://www.magma.ca/~ve2iq/grabs
Bill,
VE2IQ

At 12:44 PM 1/1/2015, Stefan DK7FC wrote:
Hi Warren,

Nice. Yes i am interested. The window is clear, see http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_LF_DX_Grabber.html =C2  (in the moment i have a QSO with DF6NM, thus the RX is overloaded but tonite it will be clean).

73, Stefan


Am 01.01.2015 18:35, schrieb Warren Ziegler:
Stefan,
=C2
=C2 =C2 =C2  Excellent work !
Is the T/A window around 137.78 clear?
I can transmit QRSS tonite if you are interested.
=C2
=C2
73 Warren
=C2

On Thu, Jan 1, 2015 at 11:04 AM, DK7FC <73dk7fc@googlemail.com > wrote:
Hi LF,

Happy new year to all over the world!

In the afternoon i have done some maintenance on the LF/MF grabber PC. Deleted about 1 million jpg files (> 100 GB) and adjusted the brightness settings for the grabber displays. It is active again now with mch improved sensitivity. In the afternoon the wideband grabber window show clearly that most of the residual man made noise is now coming from DCF39 and HGA22. 136.5 kHz is clearly the best frequency for CW.

>From the 2 seconds long daily breaks while DLF on 153 kHz switched from 500 kW to 250 kW at 19:59:58 local time i know that there will be a fignificant reduction of my background noise level on LF/137 kHz.

Now it turns out that there is an improvement of 8 dB on LF!!!
On MF there is nearly no change, just a small QRM trace disappeared. Average background noise is the same. LF and MF is using the same active antenna frontend!
On VLF (separate antenna) there is no significant change.

Here is a complation of images showing the differences before and after the closure of DLF/153kHz: https://www.dropbox.com/sh/y6vccbmn9z9v97g/AACTB7MCUVxOfYK0PXtVX1A5a?dl=3D0#= lh:null-01_3_31.DEC_23.30UTC.jpg
Unfortunately i forgot to stop my MF WSPR transmission over the night so there may show some QRM on each 10th minute.

Now, this night i will watch/receive on LF and am asking for LF stations to transmit, especially the far Russian and TA stations. Let's make it an active night while am silent (exceptionally :-) ). In the evening i am trying to make some QSOs...

Let us make a sked for a LF CW test on the weekend, maybe on 10 UTC on 136.5 kHz. Anyone interested, e.g. DK1IS?

73, Stefan/DK7FC




--
73 Warren K2ORS
=C2  =C2  =C2  =C2  =C2  =C2  =C2 = =C2  WD2XGJ
=C2  =C2  =C2  =C2  =C2  =C2  =C2  =C2&nb= sp; WD2XSH/23
=C2  =C2  =C2  =C2  =C2  =C2  =C2  =C2&nb= sp; WE2XEB/2
=C2  =C2  =C2  =C2  =C2  =C2  =C2  =C2&nb= sp; WE2XGR/1

=C2
--=====================_9398223==.ALT--