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=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_FONT_FACE_BAD,HTML_MESSAGE 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 tAPMCElV023752 for ; Wed, 25 Nov 2015 23:12:14 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a1iFj-00030P-8M for rs_out_1@blacksheep.org; Wed, 25 Nov 2015 22:09:27 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a1iFi-00030G-TJ for rsgb_lf_group@blacksheep.org; Wed, 25 Nov 2015 22:09:26 +0000 Received: from smtpout2.wanadoo.co.uk ([80.12.242.42] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a1iEf-0005hI-4X for rsgb_lf_group@blacksheep.org; Wed, 25 Nov 2015 22:09:25 +0000 Received: from AGB ([95.150.81.204]) by mwinf5d26 with ME id ly861r0084QVu9b03y86im; Wed, 25 Nov 2015 23:08:09 +0100 X-ME-Helo: AGB X-ME-Date: Wed, 25 Nov 2015 23:08:09 +0100 X-ME-IP: 95.150.81.204 Message-ID: <6FB284BB300D4DBA8A7D15B28D2597D1@AGB> From: "Graham" To: References: <8D2F5CEE86A9058-14FC-16B19E@webmail-vm002.sysops.aol.com><2062584.LhDGbAj14s@zv5000><56561D1B.7080201@abelian.org> In-Reply-To: Date: Wed, 25 Nov 2015 22:08:06 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Scan-Signature: f548c2e6c4e712c1eb3dcc8bf83f0d4f Subject: Re: LF: EbNaut and The Cat / Take 3 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0074_01D127CD.C2CBCC50" 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: 5324 This is a multi-part message in MIME format. ------=_NextPart_000_0074_01D127CD.C2CBCC50 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Bob WG2XRS =20 December 12, 2013 02:25 73 WG2XRS de DL-SWL Op65 -43 dB F:9% in nr = Wolfsburg QRA locator=E2=80=99s JO52HP and FN12LP 6246.44 km , Bob bowled a googly that night, right in at the system limit , ook 65 = mins data , -43 db , Local 'usa' decodes +20 db up. -23dB s/n OPERA 0.073 08/12/2013 23:07 WG2XRS W3NF=20 -20dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS K3SIW=20 -9dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS W1VD=20 -18dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS KB4OE=20 73-G, From: Andy Talbot=20 Sent: Wednesday, November 25, 2015 9:32 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: EbNaut and The Cat / Take 3 Its a pity we no longer have 73kHz=20 Back in the early 1990's when that band was being proposed, one of the = ideas put forward as an argument for getting it was a link budget = worked out showing how TA might be just about possible using coherent = PSK with low symbol rates - something that would have been very = difficult for amateurs in those early days of DSP. The TA path was managed eventually once, or perhaps twice AFAIR, by = very slow QRSS at high power and, I think, a period of enhanced = propagation. Suspect it would be easy enough on EbNaut now. The PIC 1kHz bandpass digitiser is a very neat way of doing the back end = of an LF narrowband SDR, allowing embedded GSP timestamp and completely = independent of all the nasties associated with soundcards Andy G4JNT On 25 November 2015 at 20:42, Paul Nicholson = wrote: Markus wrote: > take long to exhaust the permutations. And what are the limits at LF? How far do amateur signals go? For that matter, how far does this mailing list reach? How to interest more experimenters... away from Europe and North America. Was reading about lowFER, severe limits on antennas and input power. Now that could be interesting. Do lowFER signals reach Europe? Lacking DX stations, the only option is some serious QRP. Can we think of something interesting enough to drag Andy away from his GUI? -- Paul Nicholson -- ------=_NextPart_000_0074_01D127CD.C2CBCC50 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
 
 Bob WG2XRS  =20
 
December=20 12, 2013   02:25 73 WG2XRS de DL-SWL Op65 -43 dB F:9% in nr=20 Wolfsburg
 
QRA=20 locator=E2=80=99s JO52HP and FN12LP   6246.44 km=20 ,
 
Bob=20 bowled a googly that night,  right in at the  system limit = , ook=20  65 mins  data ,  -43 db = ,
 
Local 'usa'=20 decodes  +20 db up.
 
-23dB s/n OPERA 0.073 08/12/2013 23:07 WG2XRS W3NF -20dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS K3SIW -9dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS W1VD -18dBs/n OPERA 0.073 08/12/2013 23:07 WG2XRS KB4OE
 
73-G,

From: Andy Talbot
Sent: Wednesday, November 25, 2015 9:32 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: EbNaut and The Cat / Take = 3

Its a pity we no longer have 73kHz=20
Back in the early 1990's when that band was being proposed, one of = the=20 ideas put forward as an argument for getting it  was a link budget = worked=20 out showing how TA might be just about possible using coherent PSK with = low=20 symbol rates - something that would have been very difficult for = amateurs in=20 those early days of DSP.

The TA path was managed eventually once, or perhaps twice AFAIR, =  by=20 very slow QRSS at high power and, I think, a period of enhanced = propagation.=20   Suspect it would be easy enough on EbNaut now.

The PIC 1kHz bandpass digitiser is a very neat way of doing the = back end of=20 an LF narrowband SDR, allowing embedded GSP timestamp and completely = independent=20 of all the nasties associated with soundcards

Andy  G4JNT

On 25 November 2015 at 20:42, Paul Nicholson = <vlf0403@abelian.org> wrote:
Markus wrote:

>

take long to = exhaust the=20 permutations.

And what are the limits at LF?   How = far do=20 amateur signals go?

For that matter, how far does this mailing = list=20 reach?
How to interest more experimenters... away from Europe = and
North=20 America.

Was reading about lowFER, severe limits on antennas = and=20 input
power.  Now that could be interesting.   Do = lowFER=20 signals
reach Europe?

Lacking DX stations, the only option = is some=20 serious QRP.

Can we think of something interesting enough to = drag=20 Andy
away from his GUI?

--
Paul=20 Nicholson
--


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