Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w04Jda4O005603 for ; Thu, 4 Jan 2018 20:39:39 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eXBHW-0006vi-LN for rs_out_1@blacksheep.org; Thu, 04 Jan 2018 19:34:26 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eXBHV-0006vZ-Td for rsgb_lf_group@blacksheep.org; Thu, 04 Jan 2018 19:34:25 +0000 Received: from mail-wm0-x229.google.com ([2a00:1450:400c:c09::229]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eXBHS-0004b4-A4 for rsgb_lf_group@blacksheep.org; Thu, 04 Jan 2018 19:34:24 +0000 Received: by mail-wm0-x229.google.com with SMTP id f140so5277323wmd.2 for ; Thu, 04 Jan 2018 11:34:22 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=oQ5bP2qjuIaYWG9I+2EBamO17tq3abVwjw50mScBrro=; b=GlyopGZQVVQ5a56cblkWl0ZVK0Yj7Sa+CaG7ZKyU27zMpaXvCFMNfRVWpAoae2Wc18 90FF0S+EeQFAGTGuf+fu4FDQPMeElperotkK9jT6D3CO9ZEK4AIoiPn4UBZ8fZslDiZy 3W+EJh9SL/akH9Ap58jsa14QwEI4BG/dAWy/gO9cBN9mPxwj7YQtuAwMCz2fKWHm5cgm J/UxXc/gfMIlImE/8dkiaSLxnDMCGZfBfj7KnNaRLj5QC4y41RYJa+12MpVEoSc1bCNI 3bE8L2DRNGzr8QLdccKXAyFCTa16c04xAnRzTC+D77uo7rchid7R98Jt1aRb8m97GsZM o5bA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=oQ5bP2qjuIaYWG9I+2EBamO17tq3abVwjw50mScBrro=; b=eDmzm8gFf7d7EdO7jAY9ClEHAnDbkqQKswVWCO604gSoTLFKw+zASulM92lOyyXSJn N+dvlmGC5W/NO7wgOp2Apnp3I7UQ6wT67O3FLaHvbBsBXrbrK4ByBfeXDz5LhSt+x8a8 K+tzLVkXZCrrvsYMFyS1Mzu1y0KQEkuPK69xG86Tr/4Rjf3YK/EeSDhpaPremJiwX/EH P7NLUzXy9D3ZebxR4kwfMGsXDvQ9nBKYJtT++xhFK0pBNQmMFQqUFojsN7fB39bwJoEO 4OPgSfUbzJGPWwyn7Dm58jOzCjMAVpzFXhLaOJ02zTumHxYqEeF6tpWs74GvfqJpymbS uArQ== X-Gm-Message-State: AKGB3mJpdvRexssxV197eyBDzfeKT3mqE0vGnP3JU/o2xAO1fm397pnC M29HJNuNF0k0Vksv+IUVdcFhTZFQg1NTj4rHjSHeeg== X-Google-Smtp-Source: ACJfBotWpHs0QFPCE1t9BNT4S7spd6i7g6L92Ygn3ypjjOzlBzmIbJ5Q681LrudRmdof/Y5otwMWU9Iw2hEVPMcbYiU= X-Received: by 10.80.164.169 with SMTP id w38mr825855edb.154.1515094460928; Thu, 04 Jan 2018 11:34:20 -0800 (PST) MIME-Version: 1.0 Received: by 10.80.177.54 with HTTP; Thu, 4 Jan 2018 11:34:20 -0800 (PST) In-Reply-To: <1117988114.95527491.1515092735528.JavaMail.zimbra@shaw.ca> References: <4d96a9d4-5f22-7650-872b-6344e9aea8e3@abelian.org> <5A3E7C5E.7080506@posteo.de> <44f8501d-9d57-2793-b33e-ee4a2e80d6a4@abelian.org> <702563436.93043973.1515019639560.JavaMail.zimbra@shaw.ca> <1117988114.95527491.1515092735528.JavaMail.zimbra@shaw.ca> From: Andy Talbot Date: Thu, 4 Jan 2018 19:34:20 +0000 Message-ID: To: LineOne X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: As an alternative to SL and soundcards, if you're into building there are other solutions for ultra high stability digital receivers. http://www.g4jnt.com/Coherent_LF_Receiver.pdf gives details of a such a receiver that I have used in the past to sucessfully decode EbNaut transmissions (on 137kHz) [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (andy.g4jnt[at]gmail.com) 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: 84016abdd353c82964b6d256164a353f Subject: Re: LF: RE: Todmorden receiver Content-Type: multipart/alternative; boundary="94eb2c0a2acc25168b0561f86be0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_MESSAGE, MAILTO_TO_SPAM_ADDR 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 --94eb2c0a2acc25168b0561f86be0 Content-Type: text/plain; charset="UTF-8" As an alternative to SL and soundcards, if you're into building there are other solutions for ultra high stability digital receivers. http://www.g4jnt.com/Coherent_LF_Receiver.pdf gives details of a such a receiver that I have used in the past to sucessfully decode EbNaut transmissions (on 137kHz) It uses a direct downconverter from RF to 1kHz audio in a Softrock type receiver; a DDS based LO is driven from a 10MHz master reference. The 1kHz output is bandpass filtered and digitised in a PIC to give baseband I/Q channels each at 12 bit resolution at 1kHz sampling rate. The digitised samples are fed over an RS422 interface to a PC (in practice this means a USB interconnection using FTDIChip devices) GPS NMEA data is also fed into the receiver and used to timestamp the data to the PC to 1ms resolution PC Software reads the serial data and filters / decimates the digital stream to use as wanted. The beauty of using a serial RS422 format stream means any PC programming language can be used with ready made support for the COM port. If your LF to HF shack receiver is locked to the same reference, only the digitiser is needed if the receiver is used in narrow filter CW mode with the BFO / pitch at 1kHz. But note the need to pre-filter audio to the range 800 - 1200Hz so a normal SSB filter isn't suitable Andy G4JNT On 4 January 2018 at 19:05, JACK ASKEW wrote: > Thanks for the reply. I too have problems fully understanding Spectrum > Lab and envy those that use it daily. But when you get to be 75 years old > ones ability to absorb technical complex issues gets more problematic ;-) > I have been trying to use SL to receive signals at QRSS600 but it > doesn't work for me, best I can do is get QRSS120 and it's obviously just > not enough for weaker signals. I guess what I don't understand is how this > program you are using receives the data real time and or how to generate > that data so it can be seen later using this software. > > 73, Jack > > ------------------------------ > *From: *"Paul Nicholson" > *To: *"rsgb lf group" > *Sent: *Wednesday, January 3, 2018 9:48:27 PM > *Subject: *Re: LF: RE: Todmorden receiver > > > Is that software you use for the spectrum plot display > > available on line? > > Easy, it is all in your browser. It is all html and > javascript, and it is not compiled or minified. > > Just save the page to you local drive. > > Perhaps others can use it? I try to keep the code simple > and tidy to encourage that. It is necessary to provide > spectrum data on your web server in the right format. I'll > document the simple format and how to generate the data. > > -- > Paul Nicholson > -- > --94eb2c0a2acc25168b0561f86be0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
As an alternative to SL and soundcards, if you're into= building there are other solutions for ultra high stability digital receiv= ers.

http://www.g4jnt.com/Coherent_LF_Receiver.pdf=C2=A0 gives detail= s of a such a receiver that I have used in the past to sucessfully decode E= bNaut transmissions (on 137kHz)

It uses a dire= ct downconverter from RF=C2=A0 to 1kHz audio in a Softrock type receiver;= =C2=A0 a DDS based LO is driven from a 10MHz master reference.=C2=A0 The 1k= Hz output is bandpass filtered and digitised in a PIC to give baseband I/Q = channels each at 12 bit resolution at 1kHz sampling rate.=C2=A0 =C2=A0The d= igitised samples are fed over an RS422 interface to a PC (in practice this = means a USB interconnection using FTDIChip devices)=C2=A0 =C2=A0 GPS NMEA d= ata is also fed into the receiver and used to timestamp the data to the PC = to 1ms resolution

PC Software reads the serial dat= a and filters / decimates the digital stream to use as wanted.=C2=A0 =C2=A0= The beauty of using a serial RS422 format stream means any PC programming l= anguage can be used with ready made support for the COM port.
If your LF to HF shack receiver is locked to the same reference= , only the digitiser is needed if the receiver is used in narrow filter CW = mode with the BFO / pitch at 1kHz.=C2=A0 =C2=A0But note the need to pre-fil= ter audio to the range 800 - 1200Hz so a normal SSB filter isn't suitab= le

Andy=C2=A0 G4JNT

On 4 January 2018 at 19:05, JACK ASK= EW <va7jx@shaw.ca> wrote:
Thanks for the reply.=C2=A0 I too have problems fully underst= anding Spectrum Lab and envy those that use it daily.=C2=A0 But when you ge= t to be 75 years old ones ability to absorb technical complex issues gets m= ore problematic ;-) =C2=A0=C2=A0 I have been trying to use SL to receive si= gnals at QRSS600 but it doesn't work for me, best I can do is get QRSS1= 20 and it's obviously just not enough for weaker signals.=C2=A0 I guess= what I don't understand is how this program you are using receives the= data real time and or how to generate that data so it can be seen later us= ing this software.

73, Jack =C2=A0
=
F= rom: "Paul Nicholson" <vlf0403@abelian.org>
To: "rsgb = lf group" <rsgb_lf_group@blacksheep.org>
Sent: Wed= nesday, January 3, 2018 9:48:27 PM
Subject: Re: = LF: RE: Todmorden receiver

= =C2=A0> Is that software you use for the spectrum plot display
=C2=A0= > available on line?

Easy, it is all in your browser.=C2=A0 It is= all html and
javascript, and it is not compiled or minified.

Jus= t save the page to you local drive.

Perhaps others can use it?=C2=A0= I try to keep the code simple
and tidy to encourage that. =C2=A0 It is = necessary to provide
spectrum data on your web server in the right forma= t.=C2=A0 I'll
document the simple format and how to generate the dat= a.

--
Paul Nicholson
--

--94eb2c0a2acc25168b0561f86be0--