Return-Path: X-Spam-DCC: paranoid 1102; 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=-2.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE,HTML_TITLE_EMPTY 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 t5QJ8U73032567 for ; Fri, 26 Jun 2015 21:08:30 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Z8Yvi-0001Aa-51 for rs_out_1@blacksheep.org; Fri, 26 Jun 2015 20:04:50 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Z8Yvf-0001AR-Uh for rsgb_lf_group@blacksheep.org; Fri, 26 Jun 2015 20:04:47 +0100 Received: from omr-m08.mx.aol.com ([64.12.222.129]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from ) id 1Z8Yvd-0007fy-M6 for rsgb_lf_group@blacksheep.org; Fri, 26 Jun 2015 20:04:46 +0100 Received: from mtaout-mbd02.mx.aol.com (mtaout-mbd02.mx.aol.com [172.26.252.14]) by omr-m08.mx.aol.com (Outbound Mail Relay) with ESMTP id 22882700000AE for ; Fri, 26 Jun 2015 15:04:43 -0400 (EDT) Received: from White (ipb21bee4a.dynamic.kabel-deutschland.de [178.27.238.74]) by mtaout-mbd02.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 28DE53800009A for ; Fri, 26 Jun 2015 15:04:40 -0400 (EDT) Message-ID: <7D39EA36066C485998744D9E994DAC52@White> From: "Markus Vester" To: References: <8D27C7D3E7D6748-14A8-F71B3@webmail-vm149.sysops.aol.com> <558D8FEC.2090102@posteo.de> Date: Fri, 26 Jun 2015 21:04:38 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1435345483; bh=+Ewo5iXIONe8Hjkaa9Qgit6yxBho/3KE2c6bnCMI6O0=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=NkqQ9ZX6A/8T8rNXGdRGtp/8S+5IxPxwPwIX7N1Ke77F4ZzqyhQBIdzjZjbJH0sgq 1NRKu0Yq7s26DrwT+g0ArI5TEUMrAjAZpbB6QonwrjaL/vOua4JhtTag0ZtI6baUyj jEyP21PSmWZ0sChZjcFLsWseMg5hPfO/yOKLNSyY= x-aol-sid: 3039ac1afc0e558da2486209 X-AOL-IP: 178.27.238.74 X-Scan-Signature: 617a5faed955112e448650f4d003a84d Subject: Re: LF: 476.181 kHz from indoor loop Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01D0B053.B67772C0" 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: 3534 Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0004_01D0B053.B67772C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Stefan, good to see the remote station working nicely now. >> but don't see you ...yes you do ;-) There is a slight frequency offset in the remote = grabber which had put me out of your QRSS-30 band. I now switched to my = "heritage" QRG 136172.5 ahem 476172.5 Hz, and voila there it is, loud = and clear. Currently still on the low Marconi, also about 2 mW EMRP. The = relatively strong coupling to the LF grabber E-field antenna produced = some aliases and noise there, which have been mitigated by a 475 kHz = Saugkreis (trap) - same as in old AM radios ;-)=20 73, Markus From: DK7FC=20 Sent: Friday, June 26, 2015 7:46 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: 476.181 kHz from indoor loop Hi Markus,=20 Thanks for your DFCW-30 transmission. I can see you clearly in daytime = on my RX in the city! However i can't see you on my RX is the garden! = The remote system seems to run stable now, at least for a longer time = then in the last 3 days :-)=20 http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabber.html I switched between a T antenna and a loop beaming 300/120 deg but don't = see you. It appears that the hill between us is (my garden is on the = hill side, the city antenna is more distant to the hill) actually = reducing the SNR. So it also reduces QRN from the east and favours the = west. But i would prefer an omnidirectional pattern :-/ 73, Stefan Am 24.06.2015 12:11, schrieb Markus Vester:=20 I am currently running a DFCW-60 beacon on 476.181 kHz, using the same = 10m^2 indoor transmit loop as previously on LF. With 35 Watts of RF = input, estimated radiated power is around 2 mW, with lobes pointing west = and east. The daytime groundwave signal is visible in the bottom panel of the = DK7FC MF grabber. Going by the CCIR plots for 3 mS/m conductivity, the = groundwave attenuation for this distance would be about 23 dB in excess = off lossless 1/r propagation, resulting in approximately 0.2 uV/m in = Heidelberg.=20 Best 73, Markus (DF6NM) ------=_NextPart_000_0004_01D0B053.B67772C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Stefan,
 
good to see the remote station working = nicely=20 now.
 
>> but don't see you
 
...yes you do ;-) There is a slight frequency offset in = the=20 remote grabber which had put me out of your QRSS-30 band. = I now=20 switched to my "heritage" QRG 136172.5 ahem 476172.5 Hz, and = voila=20 there it is, loud and clear.
 
Currently still on the low = Marconi, also about=20 2 mW EMRP.  The relatively strong coupling to the LF=20 grabber E-field antenna produced some aliases and noise there, = which have=20 been mitigated by a 475 kHz Saugkreis (trap) - same as in old AM = radios ;-)=20
 
 73, Markus
 

From: DK7FC
Sent: Friday, June 26, 2015 7:46 PM
Subject: Re: LF: 476.181 kHz from indoor = loop

Hi Markus,

Thanks for your DFCW-30 transmission. = I can=20 see you clearly in daytime on my RX in the city! However i can't see you = on my=20 RX is the garden! The remote system seems to run stable now, at least = for a=20 longer time then in the last 3 days :-)
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabbe= r.html
I=20 switched between a T antenna and a loop beaming 300/120 deg but don't = see you.=20 It appears that the hill between us is (my garden is on the hill side, = the city=20 antenna is more distant to the hill) actually reducing the SNR. So it = also=20 reduces QRN from the east and favours the west. But i would prefer an=20 omnidirectional pattern :-/

73, Stefan

Am 24.06.2015 = 12:11,=20 schrieb Markus Vester:=20
I am currently running a DFCW-60 beacon on 476.181 kHz, = using=20 the same 10m^2 indoor transmit loop as previously on LF. With 35 = Watts of=20 RF input, estimated radiated power is around 2=20 mW, with lobes pointing west and east.
 
The daytime groundwave signal is visible in the bottom panel of = the DK7FC=20 MF grabber. Going by the CCIR plots for 3 mS/m conductivity, the=20 groundwave attenuation for this distance would be about 23 dB in = excess off=20 lossless 1/r propagation, resulting in approximately 0.2 uV/m in=20 Heidelberg. 
 
Best 73,
Markus (DF6NM)

 
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