Return-Path: Received: from mtain-ma07.r1000.mx.aol.com (mtain-ma07.r1000.mx.aol.com [172.29.96.15]) by air-dc04.mail.aol.com (v129.4) with ESMTP id MAILINDC042-86284d34a428221; Mon, 17 Jan 2011 15:18:48 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma07.r1000.mx.aol.com (Internet Inbound) with ESMTP id D430E38000047; Mon, 17 Jan 2011 15:18:46 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PevWh-0000n6-UW for rs_out_1@blacksheep.org; Mon, 17 Jan 2011 20:18:07 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PevWh-0000mx-DL for rsgb_lf_group@blacksheep.org; Mon, 17 Jan 2011 20:18:07 +0000 Received: from imr-ma06.mx.aol.com ([64.12.78.142]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PevWf-0005mt-EI for rsgb_lf_group@blacksheep.org; Mon, 17 Jan 2011 20:18:07 +0000 Received: from mtaout-da03.r1000.mx.aol.com (mtaout-da03.r1000.mx.aol.com [172.29.51.131]) by imr-ma06.mx.aol.com (8.14.1/8.14.1) with ESMTP id p0HKHv8d017688 for ; Mon, 17 Jan 2011 15:17:58 -0500 Received: from White (nrbg-4dbfbaf0.pool.mediaWays.net [77.191.186.240]) by mtaout-da03.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id BB154E0000DC for ; Mon, 17 Jan 2011 15:17:54 -0500 (EST) Message-ID: From: "Markus Vester" To: References: <1295171491.1490.6.camel@gerhard-desktop> <0DAC5FE50C1842BB85E38DAF1D1880AE@White> <1295198333.1437.41.camel@gerhard-desktop> <1FC5E94339E54506988CB09F1731DE6A@White> Date: Mon, 17 Jan 2011 21:17:54 +0100 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-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: VLF: 8970.02 (propagation effects) Content-Type: multipart/alternative; boundary="----=_NextPart_000_0016_01CBB68C.01254ED0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d600f4d34a4265c37 X-AOL-IP: 195.171.43.25 ------=_NextPart_000_0016_01CBB68C.01254ED0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Between 12 and 18 UT today, again Ossi's fieldstrength has gradually= decreased on Stefan's grabber in Heidelberg (about 400 km), while it= has increased for Lubos, Gerhard's and myself (all ~ 200 km). It look= s like it may have been increasing also for Jacek (~ 700 km) but I'm= not quite sure about the time scale of his screenshot. This seems to confirm that a) VLF interference fringes are fairly repr= oducible from one day to another, and b) they vary with range in a non= monotonuous way, but do not depend on direction or absolute positions= . Best wishes, Markus (DF6NM) From: Markus Vester=20 Sent: Sunday, January 16, 2011 8:48 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: OE3GHB_active Dear Gerhard, VLF dreamers, yes, this is indeed interesting. We are probably seeing a phasing effe= ct between skywave and groundwave (or should I say between ionospheric= waveguide modes), which depends on distance and solar elevation. The= constellation between our stations (two transmitters and two receiver= s, roughly spaced 200, 400 and 600 km along a straight line) seems to= be favourable for this kind of observations. On the MSK grabber segment, DHO exhibited a remarkable frequency selec= tive sunset dip, walking through the emission band (200 Hz HF-to-LF in= about 10 minutes). After 16:10, the VLF traces on my grabber were dis= rupted due to local 137 kHz transmit activity. Best wishes, Markus (DF6NM) From: Gerhard Hickl=20 Sent: Sunday, January 16, 2011 6:18 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: OE3GHB_active Dear Markus and group! I'm not sure but probably on your grabber there's a nice propagation effect on VLF visible. I radiated all the time today with nearly constant power, except some= 5 minutes breaks and a half hours of downtime. Ossi's signal also was very constant all the time on his grabber which is 10km away. Starting from 12:00z and lasting until about 14:00z my signal is clear= ly stronger than Ossi's signal, while at the moment, my signal isn't visible any more and Ossi's signal is still present, even maybe strong= er than most of the day. On Stefan's grabber this effect is not clearly visible. This is quite interesting. 73 OE3GHB Gerhard ------=_NextPart_000_0016_01CBB68C.01254ED0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Between 12 and 18 UT today, again Oss= i's=20 fieldstrength has gradually decreased on Stefan's grabber in=20 Heidelberg (about 400 km), while it has increased for Lubos,= Gerhard's=20 and myself (all ~ 200 km). It looks like it may have been increas= ing also=20 for Jacek (~ 700 km) but I'm not quite sure about the time scale of hi= s=20 screenshot.
 
This seems to confirm that a) VLF int= erference=20 fringes are fairly reproducible from one day to another, and=20 b) they vary with range in a non monotonuous way, but= do not=20 depend on direction or absolute positions.
 
Best wishes,
Markus (DF6NM)
 
Sent: Sunday, January 16, 2011 8:48 PM
Subject: Re: LF: OE3GHB_active
=
Dear Gerhard, VLF dreamers,
 
yes, this is indeed interesting.= We are=20 probably seeing a phasing effect between skywave and groundwave= (or should=20 I say between ionospheric waveguide modes), which depends on distance= and solar=20 elevation. The constellation between our stations (two transmitters an= d two=20 receivers, roughly spaced 200, 400 and 600 km along a straight li= ne)=20 seems to be favourable for this kind of observations.
 
On the MSK grabber segment, = ;DHO exhibited=20 a remarkable frequency selective sunset dip, walking through=20 the emission band (200 Hz HF-to-LF in about 10 minutes). <= FONT face=3DArial size=3D2>After 16:10, the VLF traces on my gr= abber were disrupted=20 due to local 137 kHz transmit activity.
 
Best wishes,
Markus (DF6NM)
<= /FONT>
Sent: Sunday, January 16, 2011 6:18 PM
Subject: Re: LF: OE3GHB_active
=
Dear Mark= us and group!

I'm not sure but probably=20 on your grabber there's a nice propagation
effect on VLF visible.
I=20 radiated all the time today with nearly constant power, except some 5<= BR>minutes=20 breaks and a half hours of downtime.

Ossi's signal also was ver= y constant=20 all the time on his grabber which
is 10km away.

Starting fro= m 12:00z=20 and lasting until about 14:00z my signal is clearly
stronger than= Ossi's=20 signal, while at the moment, my signal isn't
visible any more and= Ossi's=20 signal is still present, even maybe stronger
than most of the day.<= BR>
On=20 Stefan's grabber this effect is not clearly visible.

This is qu= ite=20 interesting.

73
OE3GHB
Gerhard

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