Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.8 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, RCVD_IN_SORBS_SPAM,SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; 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 v02Jt96f019829 for ; Mon, 2 Jan 2017 20:55:10 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cO8dO-00084O-33 for rs_out_1@blacksheep.org; Mon, 02 Jan 2017 19:51:06 +0000 Received: from [195.171.43.34] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cO8d2-00084F-GC for rsgb_lf_group@blacksheep.org; Mon, 02 Jan 2017 19:50:44 +0000 Received: from omr-m007e.mx.aol.com ([204.29.186.9]) by relay2.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.87) (envelope-from ) id 1cO8cy-0007N1-6m for rsgb_lf_group@blacksheep.org; Mon, 02 Jan 2017 19:50:42 +0000 Received: from mtaomg-mce02.mx.aol.com (mtaomg-mce02.mx.aol.com [172.29.27.208]) by omr-m007e.mx.aol.com (Outbound Mail Relay) with ESMTP id 04FDA38000C2 for ; Mon, 2 Jan 2017 14:50:38 -0500 (EST) Received: from core-acx02h.mail.aol.com (core-acx02.mail.aol.com [10.76.5.147]) by mtaomg-mce02.mx.aol.com (OMAG/Core Interface) with ESMTP id B484838000089 for ; Mon, 2 Jan 2017 14:50:37 -0500 (EST) Received: from 188.192.95.60 by webprd-m77.mail.aol.com (10.74.51.140) with HTTP (WebMailUI); Mon, 02 Jan 2017 14:50:37 -0500 Date: Mon, 2 Jan 2017 14:50:37 -0500 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15960bbcc5b-6a63-2e963@webprd-m77.mail.aol.com> In-Reply-To: <586AA7C5.8070802@abelian.org> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.95.60] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1483386637; bh=JNwM5VVrmQuicCjpq3jC2xkDn4YSXlHxIXO8PljVANA=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=oipyqz2dMQ9cGBVdhY7KtcrmMHXPL0ew7STP6Xof4uqn4a3rdT4lLOKf8p+ZsYVI1 /w//wlxURJcjOZ4+b/UjJV47/UiK+FAtC2RK0yHkM33MZgGGEATbBbb/f4O8sJfQ03 hSdRV9/cy1bVsVEYhP9lBtBmIg6irtGEDVHWdgIE= x-aol-sid: 3039ac1d1bd0586aaf0d36e6 X-Scan-Signature: 4f449c45f7b1894a9195a328eedaeb30 Subject: Re: VLF: Back on 5.17 kHz / 58 km... Content-Type: multipart/alternative; boundary="----=_Part_236977_40088011.1483386637401" 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: 10077 ------=_Part_236977_40088011.1483386637401 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable > but the signal is spread across 70uHz for some reason Similar to the Alpha's, SpecLab resets the phase of it's GPS-locked signal = generators at midnight. As 86400/4000 =3D 21.6 is not an integer number, th= ere was a 0.4 cycle (144=C2=B0) phase step at 0 UT. The discontinuity is cl= early visible on Stefan's 424 uHz grabber window. For example, 1.25 or 0.62= 5 mHz offsets would work, but not 0.5 or 0.25 mHz. Best 73, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Paul Nicholson An: rsgb_lf_group Verschickt: Mo, 2 Jan 2017 8:21 pm Betreff: Re: VLF: Back on 5.17 kHz / 58 km... Stefan wrote: > f =3D 5170.000000 Hz > Start time: 02.Jan.2017 17:00:00 UTC > Symbol length: 40 s > Characters: 5 > CRC 16 > Coding 16K25A > Duration: 12h, 26m, 40s > Antenna current: ~ 200 mA Looks good. Last night the carrier 2017-01-01_17:00,+44800 at 5169.99975 Hz measured 0.135 fT but the signal is spread across 70uHz for some reason. It may decode at Eb/N0 between 3 to 5dB, hard to say. Allowing for perspective I tweaked the building separation to 45m and the height of the service rooms to 3.5m to get 412pF and effective height 13.1m. A little better but still a long way from 480pF. Rrad is about 160u ohms so expecting 6.3uW. LWPC says 0.088 fT daytime and 0.124fT nighttime. Measured: Daytime average 0.095fT, nightime 0.135fT I wouldn't rely on either LWPC or my measurements to better than +/-50% and that is probably generous. But it's nice to see we are in the right ballpark. -- Paul Nicholson -- ------=_Part_236977_40088011.1483386637401 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
> but the signal is spread across 70uHz for some reas= on

Similar to the Alpha's, SpecLab resets the phase of it's GPS= -locked signal generators at midnight. As 86400/4000 =3D 21.6 is = not an integer number, there was a 0.4 cycle (144=C2=B0) phase step at 0 UT= . The discontinuity is clearly visible on Stefan's 424 uHz grabber window. = For example, 1.25 or 0.625 mHz offsets would work, but not 0.5 or 0.25 mHz.=

Best 73,
Markus

-----Urspr=C3=BCngliche Mitteilung----- <= br>Von: Paul Nicholson <vlf0403@abelian.org>
An: rsgb_lf_group <= ;rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 2 Jan 2017 8:21 pm
= Betreff: Re: VLF: Back on 5.17 kHz / 58 km...


Stefan wrote= :

> f =3D 5170.000000 Hz
> Start time: 02.Jan.2017 17:0= 0:00 UTC
> Symbol length: 40 s
> Characters: 5
> CRC 1= 6
> Coding 16K25A
> Duration: 12h, 26m, 40s
> Antenna = current: ~ 200 mA

Looks good.

Last night the carrier 2017-01-= 01_17:00,+44800 at 5169.99975 Hz
measured 0.135 fT but the signal is spr= ead across 70uHz for some
reason. It may decode at Eb/N0 between 3 to = 5dB, hard to say.

Allowing for perspective I tweaked the building se= paration
to 45m and the height of the service rooms to 3.5m to
get 41= 2pF and effective height 13.1m. A little better but still
a long way fr= om 480pF.

Rrad is about 160u ohms so expecting 6.3uW.

LWPC sa= ys 0.088 fT daytime and 0.124fT nighttime.

Measured: Daytime average= 0.095fT, nightime 0.135fT

I wouldn't rely on either LWPC or my mea= surements to better than
+/-50% and that is probably generous. But it's= nice to see we are
in the right ballpark.

--
Paul Nicholson--

------=_Part_236977_40088011.1483386637401--