Return-Path: Received: from mtain-me06.r1000.mx.aol.com (mtain-me06.r1000.mx.aol.com [172.29.96.142]) by air-me08.mail.aol.com (v129.4) with ESMTP id MAILINME082-8bbd4d7ffa9c38d; Tue, 15 Mar 2011 19:47:40 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 27119380000B4; Tue, 15 Mar 2011 19:47:37 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pzdwa-0002uv-FN for rs_out_1@blacksheep.org; Tue, 15 Mar 2011 23:46:28 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PzdwZ-0002um-Ru for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2011 23:46:27 +0000 Received: from imr-da01.mx.aol.com ([205.188.105.143]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PzdwX-0006wW-Hz for rsgb_lf_group@blacksheep.org; Tue, 15 Mar 2011 23:46:27 +0000 Received: from mtaout-db05.r1000.mx.aol.com (mtaout-db05.r1000.mx.aol.com [172.29.51.197]) by imr-da01.mx.aol.com (8.14.1/8.14.1) with ESMTP id p2FNkJnB018056 for ; Tue, 15 Mar 2011 19:46:19 -0400 Received: from White (nrbg-4d075d35.pool.mediaWays.net [77.7.93.53]) by mtaout-db05.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 7B358E000343 for ; Tue, 15 Mar 2011 19:46:18 -0400 (EDT) Message-ID: <2EB09032831843A5BEAAEB12F91D5210@White> From: "Markus Vester" To: References: Date: Wed, 16 Mar 2011 00:46:18 +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: Re: LF: VLF reception - easily mistaken! Content-Type: multipart/alternative; boundary="----=_NextPart_000_0038_01CBE373.8FCE3070" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,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: 3039ac1d608e4d7ffa99244e X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0038_01CBE373.8FCE3070 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The OE3GHB grabber shows a long bright line on 8969.98 from 16:00 to= 4:30. The sensitivity was not degraded, so perhaps only a local oscil= lator test. Or a nighttime carrier from OK2BVG? But it looks stronger than the sub= sequent "KKK" which Lubos sent on 8970.02 / .04 from 6:00 to 15:45. OE5ODL then shows a very bright "riser" from 6:15 to 14:15. This was= his own transmission, also visible at DK7FC.=20 So probably two different signals, both on 8969.98. Could it be that= Roger's screenshot has hints of both? Best 73, Markus (DF6NM) From: Roger Lapthorn=20 Sent: Tuesday, March 15, 2011 11:13 PM To: rsgb_lf_group@blacksheep.org ; Eddie ; oe5odl@langwelle.at=20 Subject: LF: VLF reception - easily mistaken! A word of caution to those of us looking for very weak signals around= 8-9kHz..... DJ8WX was copied here overnight without any doubt and my grabber was= clearly able to see his close-down around 0700 today. The frequency= and the trace timing corresponded perfectly. Likewise with G3XIZ and= DK7FC/P some weeks ago. This evening I was looking very carefully again at the Spectrum Lab sc= reen from the last 24 hours in 424uHz BW and readjusting audio gain ra= nges, screen colour saturation and contrast. Out of the noise appeared= another very very faint line, not at 8.970022 but at 8.96998kHz. I've= attached the screen shot here (I have overlaid it with the time for= clarity).=20 My immediate reaction was this must be Ossi OE5ODL. Then I checked his= grabber and saw he was not operational overnight last night! So, what= looked like a trace on his frequency cannot be him. It must instead= be some artefact of SL or something else. So, Mal is right (did I just say that? :-) ) that we have to be very= careful when seeing traces at specific frequencies: it may be an indi= cation of a given station, but without some modulation or turning on/o= ff of the carrier a doubt remains. Sadly I don't think I did see Ossi today after all, but I shall keep= looking. 73s Roger G3XBM --=20 g3xbm-qrp.blogspot.com/ www.g3xbm.co.uk www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 ------=_NextPart_000_0038_01CBE373.8FCE3070 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The OE3GHB grabber shows a = long bright=20 line on 8969.98 from 16:00 to 4:30. The sensitivity was not= degraded,=20 so perhaps only a local oscillator test.
Or a nighttime carrier from OK2BVG?= But it looks=20 stronger than the subsequent "KKK" which Lubos sent on 8970.02 /= .04 from=20 6:00 to 15:45.
 
OE5ODL then shows a very bright "rise= r" from 6:15=20 to 14:15. This was his own transmission, also visible at DK7FC.= =20
 
So probably two different signals, bo= th on=20 8969.98. Could it be that Roger's screenshot has hints of=20 both?
<= FONT face=3DArial> 
Best 73,
Markus (DF6NM)

<= /DIV>
=
A word of caut= ion to those of us looking for very=20 weak signals around 8-9kHz.....

DJ8WX was copied here overnight= without=20 any doubt and my grabber was clearly able to see his close-down around= 0700=20 today. The frequency and the trace timing corresponded perfectly. Like= wise with=20 G3XIZ and DK7FC/P some weeks ago.

This evening I was looking ve= ry=20 carefully again at the Spectrum Lab screen from the last 24 hours in= 424uHz BW=20 and readjusting audio gain ranges, screen colour saturation and contra= st. Out of=20 the noise appeared another very very faint line, not at 8.970022 but= at=20 8.96998kHz. I've attached the screen shot here (I have overlaid it wit= h the time=20 for clarity).

My immediate reaction was this must be Ossi OE5O= DL. Then I=20 checked his grabber and saw he was not operational overnight last nigh= t! So,=20 what looked like a trace on his frequency cannot be him. It mus= t instead=20 be some artefact of SL or something else.

So, Mal is right (did I=20 just say that? :-) ) that we have to be very careful when seein= g traces=20 at specific frequencies: it may be an indication of a given station,= but without=20 some modulation or turning on/off of the carrier a doubt remains.
<= BR>Sadly I=20 don't think I did see Ossi today after all, but I shall keep looking.<= BR clear=3Dall>
73s
Roger G3XBM
--
g3xbm-qrp.blogspot.com/=
www.g3xbm.co.= uk
www.youtube.com/user/g3xbm
G3XBM   GQRP 1678   = ISWL=20 G11088
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