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[195.171.43.25]) by mx.google.com with ESMTP id a19si1870450wja.103.2014.03.07.13.51.32 for ; Fri, 07 Mar 2014 13:51:32 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=pass (test mode) header.i=@comcast.net Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1WM2Ym-0008Kj-Jl for rs_out_1@blacksheep.org; Fri, 07 Mar 2014 21:44:04 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WM2Yl-0008Ka-Lb for rsgb_lf_group@blacksheep.org; Fri, 07 Mar 2014 21:44:03 +0000 Received: from qmta11.emeryville.ca.mail.comcast.net ([76.96.27.211]) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1WM2Yg-0002Ie-Qa for rsgb_lf_group@blacksheep.org; Fri, 07 Mar 2014 21:44:02 +0000 Received: from omta06.emeryville.ca.mail.comcast.net ([76.96.30.51]) by qmta11.emeryville.ca.mail.comcast.net with comcast id alZj1n00816AWCUABljw7f; Fri, 07 Mar 2014 21:43:56 +0000 Received: from Owner ([166.137.182.142]) by omta06.emeryville.ca.mail.comcast.net with comcast id alja1n00Z34kqxi8Sljg1i; Fri, 07 Mar 2014 21:43:51 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK From: "hvanesce" To: References: <2662DF5AA7FA416CBB09CDB90BBFF7B1@White> <016101cf39df$4f4c89a0$ede59ce0$@comcast.net>, <01dc01cf3a3f$86997bb0$93cc7310$@comcast.net> In-Reply-To: Date: Fri, 7 Mar 2014 14:43:33 -0700 Message-ID: <021901cf3a4e$5391fc10$fab5f430$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQFwHFQtNP1cuGk4XhlGVCAC9znl2gG7rsFSAR0lnQgBd+LZewJLh/X8Ab8nTT4C/5bZTJs5fR0g Content-Language: en-us DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20121106; t=1394228636; bh=F6+LhWeFpfoPHL662QX30BTX2vLzYcY0A5v8rrgWVGs=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=N7gTtQKn2kFp7vaARPv+Nk/6JAkCPxrNelqBrr0bHO3kC293onGLWzevSvzwnjC42 H5Nh70kB8lWVq51hiMn+iHpgY7EgSU13uYjxW/gqFJ59X9Wm348t2ACLdpCB/WQzC0 4zFRlgXWmXNaMM6fmYKcTRsV2IvMd4CCSnDAuvvw8LvO0ZF2fv7uj3KqH+OIBanudy dgYz4RDYLyus2vUzUMBeCf0a/TprISt/ZnBVcVBdY0YV5UMUlRXmr9km2ikkDmKvLG VHjKlIq0R2NA+XheSvmLJJjyoeE9KRBEYXV8PsdvYba6w2//2mm055AoWTqi4gj6cv 6xpMMKXCu6x1w== X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Yes Markus, By some calculations, Bob's signal is close* to being detectable 24/7 at Todmorden and often during daylight at your QTH, for the next two weeks or so. A 24-hour opportunity in April is unlikely. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [76.96.27.211 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (hvanesce[at]comcast.net) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record 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: fd68313873adb5ece25da0b9e214018d Subject: RE: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq... Content-Type: multipart/alternative; boundary="----=_NextPart_000_021A_01CF3A13.A73546F0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=HTML_60_70,HTML_MESSAGE 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 multipart message in MIME format. ------=_NextPart_000_021A_01CF3A13.A73546F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Yes Markus, By some calculations, Bob's signal is close* to being detectable 24/7 at Todmorden and often during daylight at your QTH, for the next two weeks or so. A 24-hour opportunity in April is unlikely. * with nominal propagation conditions, 4-hour integration, some tweaking and a large can of corona spray You mentioned the more realistic prospect of particular daytime slots of opportunity, such as 15UT, and I agree that the chances are good now. Daytime increase in attenuation now may be ~ 15db typical; in the summer, daytime increase in attenuation may be ~ 35dB typical. It would be difficult to guess April prospects for daytime detection/confirmation, but for planning purposes a reference point of at least 6dB additional daytime loss per month may not be unreasonable. One consideration is that terrestrial and ionospheric conditions could advance seasonal daytime-window closure without much warning; and that could be it for 29kHz daytime until fall/winter, but the window appears to be open now. 73, Jim AA5BW From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester Sent: Friday, March 7, 2014 1:45 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq... Jim, I would think that the main difference between Todmorden and Nuernberg is that I'm into the sunrise dip an hour earlier. And my noise background is higher, so I tend to completely lose a weak signal which Paul would still receive well. Anyway looking at the attached NAA plot I'm sort of perplexed by the strong propagation during the day. If Bob decided to transmit sometime around 15 UT, there's a good chance we'd pick it up. Best 73, Markus (DF6NM) From: hvanesce Sent: Friday, March 07, 2014 8:57 PM To: rsgb_lf_group@blacksheep.org Subject: RE: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq... Bob and Markus, Thanks, this seems consistent with the shape of the late-night/early-morning amplitude characteristic in the LWPC simulation (for 43N, 75W to Todmorden) that Paul sent to the group on March 1, 2014: a smooth, fast transition (and particularly with minimal multimode peak/null effects). It's interesting to note this characteristic (for this month, frequency and path), but more interesting to note consistency of Paul's LWPC result with last-night's data. I don't think that the difference in paths from Bob's location to Todmorden and to Markus' location should make much difference in the shape of the late-night/early-morning amplitude characteristic, but I could be wrong. In another example of rough agreement between VLF models and test results in this group's efforts (for roughly similar paths and times of year): the shape and magnitude of the phase characteristic measured by Paul (for 43N, 75W to Todmorden) overnight March 1st/2nd was consistent with a published model (Chilton 1964, based on empirical data) for a path of roughly similar land distance and water distance. The diurnal phase characteristic for paths of this length and orientation (43N, 75W to Todmorden) varies considerably month by month, so it was most interesting to see the close correspondence between Paul's March 1st/2nd measurements and Chilton's 1964 results for a different but analogous transatlantic path in early March. 73, Jim AA5BW From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Bob Raide Sent: Friday, March 7, 2014 9:22 AM To: rsgb_lf_group@blacksheep.org Subject: RE: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq... Markus; I closed at 0820 as I saw the signal went away at about 0700 on the Markus grabber. Had to be up early so couldn't stay on longer. Will stay on longer tonite-Bob _____ From: markusvester@aol.com To: rsgb_lf_group@blacksheep.org Date: Fri, 7 Mar 2014 11:37:49 +0100 Subject: Re: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq... Jim, I dont really know when Bob switched off... On my grabber, the signal dropped sharply around 6 UT, thus the correlation peak was probably based on the first half of the sequence which ended 6:52. But on Paul's spectrogram http://abelian.org/vlf/sg29499.shtml the carrier stayed visible until after 8 UT. 73, Markus (DF6NM) From: hvanesce Sent: Friday, March 07, 2014 9:28 AM To: rsgb_lf_group@blacksheep.org Subject: RE: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq... Markus, This is a welcome sight. Thanks to you and Bob. Was this detection made approximately ten minutes before Bob switched off? 73, Jim AA5BW From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester Sent: Friday, March 7, 2014 1:04 AM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq... Just one detection here, but that makes it worth the effort: 2014-03-07 06:52:02 WH1XBA 6448km 29499.000Hz 1mHz -52.9dBOp 100% 15.3dB Out of the last four nights, this was the one with the highest noise. The carrier was visible since about 0:30, but the detection occured only in the morning when the noise went down before the signal did. Unlike Paul in Todmorden, I don't have a steerable pair of loops, so only the blanker to combat the statics. Bob, thanks for this signal! Best 73, Markus (DF6NM) ------=_NextPart_000_021A_01CF3A13.A73546F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Yes Markus,

 

By some calculations, Bob’s signal is close* to being = detectable 24/7 at Todmorden and often during daylight at your QTH, for = the next two weeks or so. A 24-hour opportunity in April is = unlikely.

 

* with nominal propagation conditions, 4-hour integration, some = tweaking and a large can of corona spray

 

You mentioned the more realistic prospect of particular daytime slots = of opportunity, such as 15UT, and I agree that the chances are good now. =

 

Daytime increase in attenuation now may be ~ 15db typical; in the = summer, daytime increase in attenuation may be ~ 35dB typical. It would = be difficult to guess April prospects for daytime = detection/confirmation, but for planning purposes a reference point of = at least 6dB additional daytime loss per month may not be unreasonable. = One consideration is that terrestrial and ionospheric conditions could = advance seasonal daytime-window closure without much warning; and that = could be it for 29kHz daytime until fall/winter, but the window appears = to be open now.

 

73,   Jim AA5BW

 

 

From:= = owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus = Vester
Sent: Friday, March 7, 2014 1:45 PM
To: = rsgb_lf_group@blacksheep.org
Subject: Re: LF: New OPERA = OP/OPDS 2H tonight on 27.945 Dial = Freq...

 

Jim,

 

I would = think that the main difference between Todmorden and Nuernberg is that = I'm into the sunrise dip an hour earlier. And my noise background is = higher, so I tend to completely lose a weak signal which Paul would = still receive well.

 

Anyway = looking at the attached NAA plot I'm sort of perplexed by the = strong propagation during the day. If Bob decided to transmit = sometime around 15 UT, there's a good chance we'd pick it = up.

 

Best = 73,

Markus = (DF6NM)

 

 <= /o:p>

From:= = hvanesce =

Sent:= = Friday, March 07, 2014 8:57 PM

Subject: RE: LF: = New OPERA OP/OPDS 2H tonight on 27.945 Dial = Freq...

 

Bob and Markus,

 

Thanks, this seems consistent with the shape of the = late-night/early-morning amplitude characteristic in the LWPC simulation = (for 43N, 75W to Todmorden) that Paul sent to the group on March 1, = 2014: a smooth, fast transition (and particularly with minimal multimode = peak/null effects).

 

It’s interesting to note this characteristic (for this month, = frequency and path), but more interesting to note consistency of = Paul’s LWPC result with last-night’s = data.

 

I don’t think that the difference in paths from Bob’s = location to Todmorden and to Markus’ location should make much = difference in the shape of the late-night/early-morning amplitude = characteristic, but I could be wrong.

 

In another example of rough agreement between VLF models and test = results in this group’s efforts (for roughly similar paths and = times of year): the shape and magnitude of the phase characteristic = measured by Paul (for 43N, 75W to Todmorden) overnight March = 1st/2nd was consistent with a published model = (Chilton 1964, based on empirical data) for a path of roughly similar = land distance and water distance. The diurnal phase characteristic for = paths of this length and orientation (43N, 75W to Todmorden) varies = considerably month by month, so it was most interesting to see the close = correspondence  between Paul’s March = 1st/2nd measurements and Chilton’s 1964 = results for a different but analogous transatlantic path in early = March.

 

73,  Jim AA5BW

 

 

 

 

From:= = owner-rsgb_lf_group@bl= acksheep.org [mailto:owner-rsgb_lf_g= roup@blacksheep.org] On Behalf Of Bob Raide
Sent: = Friday, March 7, 2014 9:22 AM
To: rsgb_lf_group@blacksheep.org=
Subject: RE: LF: New OPERA OP/OPDS 2H tonight on 27.945 = Dial Freq...

 

Markus;
I closed at 0820 = as I saw the signal went away at about 0700 on the Markus grabber.  = Had to be up early so couldn't stay on longer.  Will stay on longer = tonite-Bob
 

From: markusvester@aol.com
To: rsgb_lf_group@blacksheep.org=
Date: Fri, 7 Mar 2014 11:37:49 +0100
Subject: Re: LF: New = OPERA OP/OPDS 2H tonight on 27.945 Dial = Freq...

Jim,

=

 

=

I dont = really know when Bob switched off... On my grabber, the signal = dropped sharply around 6 UT, thus the correlation peak was probably = based on the first half of the sequence which ended 6:52. But on = Paul's spectrogram http://abelian.org/vlf/sg29499.shtml the carrier stayed = visible until after 8 UT.

=

 

=

73, =

=

Markus = (DF6NM)

=

 <= /o:p>

From:= = hvanesce

Sent:= = Friday, March 07, 2014 9:28 AM

Subject: RE: LF: = New OPERA OP/OPDS 2H tonight on 27.945 Dial = Freq...

 

=

Markus,

 

This is a welcome sight. Thanks to you and Bob. Was this detection = made approximately ten minutes before Bob switched off?

 

73, Jim AA5BW

 

<= div style=3D'border:none;border-top:solid windowtext 1.0pt;padding:3.0pt = 0in 0in 0in'>

From:= = owner-rsgb_lf_group@bl= acksheep.org [mailto:owner-rsgb_lf_g= roup@blacksheep.org] On Behalf Of Markus = Vester
Sent: Friday, March 7, 2014 1:04 AM
To: rsgb_lf_group@blacksheep.org=
Subject: Re: LF: New OPERA OP/OPDS 2H tonight on 27.945 = Dial Freq...

=

 

=

Just one = detection here, but that makes it worth the effort:

=

 

=

2014-03-07 = 06:52:02 WH1XBA  6448km  29499.000Hz   1mHz = -52.9dBOp 100% 15.3dB

 

=

Out of the = last four nights, this was the one with the highest noise. The = carrier was visible since about 0:30, but the detection occured only in = the morning when the noise went down before the signal did. Unlike Paul = in Todmorden, I don't have a steerable pair of loops, so only the = blanker to combat the statics.

=

 

=

Bob, thanks = for this signal!

=

 

=

Best 73,=

=

Markus = (DF6NM)

=

 

=

 

=
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