Return-Path: X-Spam-DCC: paranoid 104; 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=-1.9 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_40_50,HTML_MESSAGE,SPF_PASS 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 u22BQP62014422 for ; Wed, 2 Mar 2016 12:26:25 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ab4rZ-00075L-9y for rs_out_1@blacksheep.org; Wed, 02 Mar 2016 11:22:41 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ab4rY-00075A-On for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2016 11:22:40 +0000 Received: from mail-vk0-x22c.google.com ([2607:f8b0:400c:c05::22c]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1ab4rW-0003n0-5L for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2016 11:22:39 +0000 Received: by mail-vk0-x22c.google.com with SMTP id e6so197907228vkh.2 for ; Wed, 02 Mar 2016 03:22:37 -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=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to; bh=lPqLrcXBoL3Kpb4Yn6b5yejoYUIOmqDOXl3hwlsTtXU=; b=BXmcCmnHtA5Cq4xDauPCQescU8S5dhboBLOzmQLHHGcu7A06ixr/xSZDNRjUeEqzO/ OzKACXs6c1lTwakbSiaeC8JGge1DOY8kztZ3fdFb8ZQ0pnJxmXS3z3PTbBK9Aakt51aq rBUFw7qe5FUCqWsXbnq0AUxb/nC2g2ndmdzKqGUC0Y7X0oVZ3tLJlWFxuJeXukWTdXuQ rleHqDRrNzVt2ck6ld+7uvu0yTOpyFayv0/0e4HdZDuhUh2vkQluvHVhECRMOohgiF1b Yo36glbm1LsMoRUfhilDnnsz63krcO5OMZwS2fPUPMaxxqfs4m9sDfzR2O1w13APfR9O D1cg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to; bh=lPqLrcXBoL3Kpb4Yn6b5yejoYUIOmqDOXl3hwlsTtXU=; b=H10tDEEhbg3J9yQJsdR4UX8ruSr062DbMGe3awxq7go5sojDqD6viou9sh/ncTgbre lvFR9lJFFqVrUD7FnjOzCMwTFsgxva4xHtvAUGBQ3G7vaM2ZSrTB8iNbVZdcqM3/w5N1 BAKI8fQVXkg3ELNoCowbgZO5p3ZQzT1WrPcktWVnA05TtQpIs37r+GFqi4pTg4MBeFky uOPsg2RmO+FGp5kCnrFbXGQ9FpXw4OS3Qne0fDSgWVYsYM7GLFPw3khNz06ClcSR7CcB UC2e+ShOqfvGOIVEjiPAuuGyVYV2R3UA5W8bnfGuojPYinT++LVXAYxzh4hdKcL8kdTG Amqg== X-Gm-Message-State: AD7BkJLKw8X6MI0bAj44hNDzj7JBwHa6INKl/X6dPfjMd6TKVbOq4CU6gbMtNLJa7U696SYyq7SxL3H3V6aUhQ== MIME-Version: 1.0 X-Received: by 10.31.141.10 with SMTP id p10mr20313183vkd.93.1456917756041; Wed, 02 Mar 2016 03:22:36 -0800 (PST) Received: by 10.159.32.198 with HTTP; Wed, 2 Mar 2016 03:22:35 -0800 (PST) In-Reply-To: <2BA8BCBD4ED749BA8F495E07214840BC@gnat> References: <2BA8BCBD4ED749BA8F495E07214840BC@gnat> Date: Wed, 2 Mar 2016 11:22:35 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 9bd342c7d74bc0c7d15d59c1164ca995 Subject: Re: LF: Re: Old "Coherent" mode Content-Type: multipart/alternative; boundary=001a11425f5050e28c052d0f1989 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7163 --001a11425f5050e28c052d0f1989 Content-Type: text/plain; charset=UTF-8 Interesting Looking back in my PIC code archives, the listing labelled "VE2IQIF.ASM" is dated October 2000 and is a 7200Hz version of the original 10kHz sampling one I used for DSP back then. Do recall studying the VE2IQ "official" interface circuitry and suddenly realising it was a straightforward A/D plus RS232 formatter combined into a set of logic chips. So the PIC sampler just needed a sampling rate change. Back then we had to use expensive UV erasable chips for code development, then cheaper One Time Programmable ones for final versions. So for code development I used to have three windowed chips on the go at any time, one in the eraser, one running and one waiting the next set of changes. It was possible to reuse OTP chips by starting way down in memory, then working back for each version and overwriting an initial GOTO statement with a NOP - very tedious How technology has changed is less than two decades. Andy G4JNT On 2 March 2016 at 11:02, Alan Melia wrote: > Hi Andy Bill moved west but did appear on one of the groups a few months > back I think. I seem to remember Toronto being mentioned. > > The progress was COHERENT>> AFRICA >> AFRICAM. I think, Wolf appeared > later from a different source as a sound card application. (somewhere I > have a print of the original web posting for it) All Bill's software was > operated via his sigma-delta ADC with RS-232 comms to the PC.......I have a > nice boxed one here acquired from Dave Bowman. > > One other system that was quite popular was Jason from Alberto, as a > keyboard QSO data mode. > > Alan > G3NYK > > > ----- Original Message ----- > *From:* Andy Talbot > *To:* rsgb_lf_group@blacksheep.org ; rsgb_lf_group@yahoogroups.co.uk > *Sent:* Wednesday, March 02, 2016 7:59 AM > *Subject:* LF: Old "Coherent" mode > > Back in the last millennium, on 73kHz I remember using a BPSK mode called " > *Coherent*" by VE1IQ. I do remember generating raw unfiltered BPSK and > casually 'ignoring' its sidebands, and also that the abrupt phase > transition led to audible clicks from my antenna loading coil > > Purely out of interest (and because I thought I'd include it in a talk on > LF operation I'm giving in a couple of weeks) I searched for any details on > t'web. VE2IQ's page still seems to exist, but all references date back to > that era - I didn't try downloading the software. > > In those pre-soundcard days we had to use hardware audio digitisers on > receive, and I remember doing a PIC based one to replace the board of TTL > logic otherwise needed. Still have a PCB on a shelf here labelled "VE2IQ > Interface"; it's just an A/D converter and serial interface to a PC, with > 8 bit sampling at 7200Hz. > > Did *Coherent *morph into Wolf? As they both use the same modulation / > baud rate it seems more than coincidence... > > Andy G4JNT > > --001a11425f5050e28c052d0f1989 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Interesting

Looking back in = my PIC code archives, the listing labelled "VE2IQIF.ASM" is dated= October 2000 and is a 7200Hz version of the original 10kHz sampling one I = used for DSP back then.=C2=A0=C2=A0 Do recall studying the VE2IQ "offi= cial" interface circuitry and suddenly realising it was a straightforw= ard A/D plus RS232 formatter combined into a set of logic chips.=C2=A0=C2= =A0 So the PIC sampler just needed a sampling rate change.

Back then we had to use expensive UV erasable chips for code devel= opment, then cheaper One Time Programmable ones for final versions.=C2=A0= =C2=A0 So for code development I used to have three windowed chips on the g= o at any time, one in the eraser, one running and one waiting the next set = of changes.=C2=A0=C2=A0
It was possible to reuse OTP chips by st= arting way down in memory, then working back for each version and overwriti= ng an initial GOTO statement with a NOP - very tedious

=
How=C2=A0technology has changed is less than two decades.
Andy=C2=A0 G4JNT

On 2 March 2016 at 11:02, Alan Melia <alan= .melia@btinternet.com> wrote:
Hi Andy Bill moved west but did appear= on one of=20 the groups a few months back I think. I seem to remember Toronto being=20 mentioned.
=C2=A0
The progress was COHERENT>> AFRI= CA >>=20 AFRICAM. I think, Wolf appeared later from a different source as a sound ca= rd=20 application. (somewhere I have a print of the original web posting for it) = All=20 Bill's software was operated via his sigma-delta ADC with RS-232 comms = to the=20 PC.......I have a nice boxed one here acquired from Dave Bowman.
=C2=A0
One other system that was quite popula= r was Jason=20 from Alberto, as a keyboard QSO=C2=A0data=C2=A0mode.
=C2=A0
Alan
G3NYK
=C2=A0
----- Original Message -----
From:=20 Andy=20 Talbot
Sent: Wednesday, March 02, 2016 7:59=20 AM
Subject: LF: Old "Coherent" mode

Back in the last millennium, on 73kHz I remember using a BPSK mode c= alled=20 "Coherent"=C2=A0 by VE1IQ.=C2=A0=C2=A0 I do remember g= enerating raw=20 unfiltered BPSK and casually =C2=A0'ignoring' its sidebands, and = also that the=20 abrupt phase transition led to audible clicks from my antenna loading=20 coil

Purely out of interest (and because I thought I'd include it in = a talk on=20 LF operation I'm giving in a couple of weeks) I=C2=A0searched for any= details=20 on t'web.=C2=A0=C2=A0 VE2IQ's page still seems to exist, but all = references=20 date back to that era - I didn't try downloading the software.

In those pre-soundcard days we had to use hardware audio digitisers = on=20 receive, and I remember doing a PIC based one to replace=C2=A0the board o= f TTL=20 logic otherwise needed.=C2=A0=C2=A0 Still have a PCB on a shelf here labe= lled=20 "VE2IQ Interface";=C2=A0 it's just an A/D converter and ser= ial interface to a=20 PC, with 8 bit sampling=C2=A0at 7200Hz.

Did Coherent morph into Wolf?=C2=A0 As=C2=A0 they both use = the=20 same modulation / baud rate it seems more than coincidence...

Andy=C2=A0 G4JNT

--001a11425f5050e28c052d0f1989--