X-GM-THRID: 1200385093251655616 X-Gmail-Labels: rsgb lf X-Gmail-Received: a2b14de3ce32f2fb392e6ac4c81f8cbb243672a1 Delivered-To: daveyxm@gmail.com Received: by 10.54.70.6 with SMTP id s6cs477wra; Tue, 11 Apr 2006 10:27:13 -0700 (PDT) Received: by 10.48.215.3 with SMTP id n3mr2271492nfg; Tue, 11 Apr 2006 10:27:13 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id d2si1305884nfe.2006.04.11.10.27.12; Tue, 11 Apr 2006 10:27:13 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1FTMbj-0003bE-P9 for rs_out_1@blacksheep.org; Tue, 11 Apr 2006 18:24:51 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FTMbj-0003b5-6A for rsgb_lf_group@blacksheep.org; Tue, 11 Apr 2006 18:24:51 +0100 Received: from newbox.tcp.net.uk ([195.80.0.243]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1FTNrH-0008F6-Rq for rsgb_lf_group@blacksheep.org; Tue, 11 Apr 2006 19:45:01 +0100 Received: from d4f8d8 ([212.248.140.11]) by newbox.tcp.net.uk (8.12.7/8.12.7) with ESMTP id k3BHMUCM003317 for ; Tue, 11 Apr 2006 18:22:31 +0100 (BST) Received: from 127.0.0.1 (AVG SMTP 7.1.385 [268.4.1/308]); Tue, 11 Apr 2006 17:18:42 +0100 Message-ID: <002e01c65d83$999add40$045bfea9@d4f8d8> From: "Andy Talbot" To: Date: Tue, 11 Apr 2006 17:18:42 +0100 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Mime-Version: 1.0 X-TCP-MailScanner-Information: Please visit www.tcp.co.uk for more information X-TCP-MailScanner: Found to be clean X-TCP-MailScanner-SpamScore: s X-TCP-MailScanner-From: actalbot@southsurf.com X-Spam-Score: -1.1 (-) X-Spam-Report: autolearn=disabled,AWL=-1.236,HTML_50_60=0.095,HTML_MESSAGE=0.001,HTML_TITLE_EMPTY=0.045 Subject: Re: LF: Rugby LORAN measurement? Continued Content-Type: multipart/mixed; boundary="=======AVGMAIL-443BD6E25F6D=======" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.0 required=5.0 tests=HTML_20_30,HTML_MESSAGE, HTML_TITLE_EMPTY 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 Status: O X-Status: X-Keywords: X-UID: 5926 --=======AVGMAIL-443BD6E25F6D======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_002B_01C65D8B.FB4E7C60" ------=_NextPart_000_002B_01C65D8B.FB4E7C60 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I should have said, by pulse I mean a break in carrier, so the actual = pulses are 900ms, 800ms and a few at 700ms. On Alberto's plot the main = zero at 10Hz is very clear, and there is adefinite dip at 5Hz caused by = some of the pulses having a 200ms (800ms) period. The spectrum caused = by the few 300ms pulses won't be visible since a) there are very few, if = any of these and b) its first zero would be at 3.333Hz so wouldn't be = visible in the line spectrum. Andy G4JNT www.scrbg.org/g4jnt/ ----- Original Message -----=20 From: Andy Talbot=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, April 11, 2006 5:13 PM Subject: Re: LF: Rugby LORAN measurement? The pulses have a width of either 100, 200 or 300us. The time/date = is carried by pulse width mod :100ms =3D 0, 200ms =3D 1, with a = framing code at the 52 - 59 second interval of '01111110'. Parity = checks and DUT info are carried in a 'second level' pulse during the = framing code, so some of the pulses are extended from 200 to 300ms. The = seconds marker is 500ms long. So... Your answer is that all pulses are a multiple of 1/ (10Hz) hence there = is a sin(x) /x pattern is based on 10Hz and 5Hz convolved with the 1Hz = PRF ------=_NextPart_000_002B_01C65D8B.FB4E7C60 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
I should have said, by pulse I mean a = break in=20 carrier,  so the actual pulses are 900ms, 800ms and a few at = 700ms. =20 On Alberto's plot the main zero at 10Hz is very clear, and there is = adefinite=20 dip at 5Hz caused by some of the pulses having a 200ms (800ms) = period.  The=20 spectrum caused by the few 300ms pulses won't be visible since a) there = are very=20 few, if any of these and b) its first zero would be at 3.333Hz so = wouldn't be=20 visible in the line spectrum.
 
Andy  G4JNT
www.scrbg.org/g4jnt/
 
----- Original Message -----
From:=20 Andy=20 Talbot
To: rsgb_lf_group@blacksheep.org= =20
Sent: Tuesday, April 11, 2006 = 5:13=20 PM
Subject: Re: LF: Rugby LORAN=20 measurement?

The pulses have a width of either = 100, 200 or=20 300us.  The time/date  is carried by pulse width mod = :100ms =3D 0,  200ms =3D 1,  with a = framing code at the=20 52 - 59 second interval of '01111110'.  Parity checks and DUT = info are=20 carried in a 'second level' pulse during the framing code, so some of = the=20 pulses are extended from 200 to 300ms.  The seconds marker is = 500ms=20 long.
 
So...
Your answer is that all pulses are a = multiple of=20 1/ (10Hz) hence there is a  sin(x) /x  pattern is based on = 10Hz and=20 5Hz convolved with the 1Hz PRF
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