Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id wBTHrP95025342 for ; Sat, 29 Dec 2018 18:53:31 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gdIk5-0004Yc-Bf for rs_out_1@blacksheep.org; Sat, 29 Dec 2018 17:49:45 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gdIk4-0004YT-Tm for rsgb_lf_group@blacksheep.org; Sat, 29 Dec 2018 17:49:44 +0000 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1gdIk3-000710-3R for rsgb_lf_group@blacksheep.org; Sat, 29 Dec 2018 17:49:43 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id D64B2160061 for ; Sat, 29 Dec 2018 18:49:41 +0100 (CET) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1546105781; bh=KYBspJt9OCDHmWTCbbwXwHyjavnLixTf8zpzTxsMkh0=; h=Date:From:To:Subject:From; b=OdpYzUAKgU5wx38FPokO4WABG56dFDBOMDdT5eQZTTzKB7LAByfqrFWOV2TsUqiqH 6hMTZ/RqBR5Lcd3W8ScXgIESPb+CevINyY7m09haS5myMfUBoKiXbWKQ+acsEvpTex ogGLTywqMkwVKwT8Wwn1dUE300DtKUkhvgevDU85BODu1q4ay7pQY1Tv3rOVJr5NWi VXQAuQ8nnhNxOZXxFstYwCIED9WtuzKXsE6cmnPUVMeKz8ZiaOsbWReO4BT2iH8hnI ZtmmA86exDOccYhOWzQSyp9rEIuMVbuqEbH/teEXBBzTbejewq7JJKetUTnQrd/10y ZsE9O0w2uuahQ== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 43RrgT1g0hz6tmB for ; Sat, 29 Dec 2018 18:49:41 +0100 (CET) Message-ID: <5C27B3B5.5000602@posteo.de> Date: Sat, 29 Dec 2018 18:49:41 +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: <1208359361.10549501.1546091687688.ref@mail.yahoo.com> <1208359361.10549501.1546091687688@mail.yahoo.com> <030c01d49f95$fabc3990$f034acb0$@comcast.net> In-Reply-To: <030c01d49f95$fabc3990$f034acb0$@comcast.net> X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Hello Jim, The signal shows up to 225 nV/m on Pauls grabber, http://78.46.38.217/fbins3.html#p=1546099200&b=120&s=sp&m=omni&w=r&h=42&z1=0.34&z2=0.64&c=1&mb=748,57,763,228,1 The noise is pulled in the background [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.65 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 NORMAL_HTTP_TO_IP URI: URI host has a public dotted-decimal IPv4 address 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 9be7bcf37980c7e1f7256b45328d3ffd Subject: Re: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna - The 6th station on Paul's spectrogram Content-Type: multipart/alternative; boundary="------------020405010805080809050103" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.7 required=5.0 tests=HTML_40_50,HTML_MESSAGE, NORMAL_HTTP_TO_IP autolearn=no version=2.63 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 This is a multi-part message in MIME format. --------------020405010805080809050103 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello Jim, The signal shows up to 225 nV/m on Pauls grabber, http://78.46.38.217/fbins3.html#p=1546099200&b=120&s=sp&m=omni&w=r&h=42&z1=0.34&z2=0.64&c=1&mb=748,57,763,228,1 The noise is pulled in the background when switching to 'S/N ratio'! :-) I did never expect that this antenna will perform better than my large INV-L in 30m above the ground. Good to know i do now have a second option to this antenna, at least for sporadic transmissions. 2.5 A antenna current, that's quite much already. The PA is totally cold while switching at this frequency! I could easily run 1 kW or 2 kW on this PA. The limiting factor is the rated current of the wire. It will also handle another 6 dB or so :-) Wonder if it is possible to transfer a 500 character message over to Paul with 1 accu load, say 1 kWh :-) 73, Stefan Am 29.12.2018 17:45, schrieb hvanesce@comcast.net: > > Good diagnosis Markus; and excellent to see six ~ 8270 Hz signals on > Paul’s grabber! > > I wonder if the distribution of the Earth loop’s radiation pattern > includes a somewhat higher percentage of higher elevation angles (than > with the five electric field antennas recently operating at 8270 Hz), > which could emphasize the process that Markus described. > > I think that Paul’s grabber’s 186 hour window with the six ~ 8270 Hz > signals including diurnals and coordination is suitable for framing, a > beautiful sight. > > 73, > > Jim AA5BW > > *From:* owner-rsgb_lf_group@blacksheep.org > [mailto:owner-rsgb_lf_group@blacksheep.org] *On Behalf Of *Markus Vester > *Sent:* Saturday, December 29, 2018 8:55 AM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: VLF Carrier on 8270.01 Hz from a ground loop > antenna - The 6th station on Paul's spectrogram > > Hi Stefan, > > strangely, nothing is visible here in Nürnberg now. > > At DL0AO, the portable transmission (~ 280 km) appears to be around 9 > dB stronger compared to the institute in Heidelberg (~ 230 > km, reference measurement at 7:50 UT on Dec 27). However here in > Nürnberg it seems to be the other way round: the transmission from the > institute (180 km) was strong (up to 20 dB SNR) all day, but the > signal from the guiderails (230 km) is completely invisible now. > > The explanation may be that a sharp midday minimum exists at 230 km. > Looking at DL0AO traces, we can see that the signal from the institute > indeed almost disappeared at noon. During earlier Experiments it > seemed that the minimum was very pronounced on our 180 km path, but > that was later in the year around April and May. This seems to make > sense, as higher solar Illumination pushed the midday ionoshere > further dowen, requiring steeper skywave angle to arrive at the same > 3/2 lambda path difference for cancellation. > > Best 73, > Markus (DF6NM) > > -----Ursprüngliche Mitteilung----- > Von: DK7FC > > An: rsgb_lf_group > > Verschickt: Sa, 29. Dez 2018 13:45 > Betreff: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna - > The 6th station on Paul's spectrogram > > Hi VLF friends, > > Since 11:35 UTC i'm running about 2.5 A antenna current into my 900m > long ground loop antenna. Frequency is 8270.01 Hz. The signal is very > strong on my own grabber in 57.6 km distance but also at DF6NM, DL0AO > and it looks like there is a peak now on Paul's spectrogram building up > slowly. > I intend to run the carrier for 2 hours or so, until the accu is almost > empty :-) > The H bridge PA voltage is 175 V and the power consumption is 450 W. > Today, the DC measuremant result is 66V for 1 A antenna current. It is > cold and wet! > More soon. > > 73 de DK7FC/P in JN39WI > > PS: The QRN is exceptional low!!!! > --------------020405010805080809050103 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit Hello Jim,

The signal shows up to 225 nV/m on Pauls grabber, http://78.46.38.217/fbins3.html#p=1546099200&b=120&s=sp&m=omni&w=r&h=42&z1=0.34&z2=0.64&c=1&mb=748,57,763,228,1
The noise is pulled in the background when switching to 'S/N ratio'! :-)

I did never expect that this antenna will perform better than my large INV-L in 30m above the ground. Good to know i do now have a second option to this antenna, at least for sporadic transmissions.

2.5 A antenna current, that's quite much already. The PA is totally cold while switching at this frequency! I could easily run 1 kW or 2 kW on this PA. The limiting factor is the rated current of the wire. It will also handle another 6 dB or so :-)
Wonder if it is possible to transfer a 500 character message over to Paul with 1 accu load, say 1 kWh :-)

73, Stefan


Am 29.12.2018 17:45, schrieb hvanesce@comcast.net:

Good diagnosis Markus; and excellent to see six ~ 8270 Hz signals on Paul’s grabber!

 

I wonder if the distribution of the Earth loop’s radiation pattern includes a somewhat higher percentage of higher elevation angles (than with the five electric field antennas recently operating at 8270 Hz), which could emphasize the process that Markus described.

 

I think that Paul’s grabber’s 186 hour window with the six ~ 8270 Hz signals including diurnals and coordination is suitable for framing, a beautiful sight.

 

73,

 

Jim AA5BW  

 

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester
Sent: Saturday, December 29, 2018 8:55 AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna - The 6th station on Paul's spectrogram

 

Hi Stefan,

strangely, nothing is visible here in Nürnberg now.

At DL0AO, the portable transmission (~ 280 km) appears to be around 9 dB stronger compared to the institute in Heidelberg (~ 230 km, reference measurement at 7:50 UT on Dec 27). However here in Nürnberg it seems to be the other way round: the transmission from the institute (180 km) was strong  (up to 20 dB SNR) all day, but the signal from the guiderails (230 km) is completely invisible now. 

The explanation may be that a sharp midday minimum exists at 230 km. Looking at DL0AO traces, we can see that the signal from the institute indeed almost disappeared at noon. During earlier Experiments it seemed that the minimum was very pronounced on our 180 km path, but that was later in the year around April and May. This seems to make sense, as higher solar Illumination pushed the midday ionoshere further dowen, requiring steeper skywave angle to arrive at the same 3/2 lambda path difference for cancellation. 

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 29. Dez 2018 13:45
Betreff: LF: VLF Carrier on 8270.01 Hz from a ground loop antenna - The 6th station on Paul's spectrogram

Hi VLF friends,

Since 11:35 UTC i'm running about 2.5 A antenna current into my 900m
long ground loop antenna. Frequency is 8270.01 Hz. The signal is very
strong on my own grabber in 57.6 km distance but also at DF6NM, DL0AO
and it looks like there is a peak now on Paul's spectrogram building up
slowly.
I intend to run the carrier for 2 hours or so, until the accu is almost
empty :-)
The H bridge PA voltage is 175 V and the power consumption is 450 W.
Today, the DC measuremant result is 66V for 1 A antenna current. It is
cold and wet!
More soon.

73 de DK7FC/P in JN39WI

PS: The QRN is exceptional low!!!!

 

--------------020405010805080809050103--