Return-Path: X-Spam-DCC: paranoid 1233; 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 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 tAFDaARP004710 for ; Sun, 15 Nov 2015 14:36:11 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZxxPo-00049C-JD for rs_out_1@blacksheep.org; Sun, 15 Nov 2015 13:32:20 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZxxPo-000493-7n for rsgb_lf_group@blacksheep.org; Sun, 15 Nov 2015 13:32:20 +0000 Received: from omr-a020e.mx.aol.com ([204.29.186.66]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.86) (envelope-from ) id 1ZxxOe-0000V7-VX for rsgb_lf_group@blacksheep.org; Sun, 15 Nov 2015 13:32:19 +0000 Received: from mtaout-aaj01.mx.aol.com (mtaout-aaj01.mx.aol.com [172.27.3.205]) by omr-a020e.mx.aol.com (Outbound Mail Relay) with ESMTP id 78A533800064 for ; Sun, 15 Nov 2015 08:30:55 -0500 (EST) Received: from White (ipbcc05f3c.dynamic.kabel-deutschland.de [188.192.95.60]) by mtaout-aaj01.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 833A63800008F for ; Sun, 15 Nov 2015 08:30:52 -0500 (EST) Message-ID: <1D1F983E9B4640778B8AF51C5673868D@White> From: "Markus Vester" To: References: <56478990.2@abelian.org> Date: Sun, 15 Nov 2015 14:30:50 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 x-aol-global-disposition: G X-AOL-VSS-INFO: 5700.7163/106938 X-AOL-VSS-CODE: clean DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1447594255; bh=YN0bdjiteWIVDuWYVQ2Y+7s9+JthIhwNlUFu9MtjCjQ=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=coId/6RtIRuLBWwkX3uxiAxmuXJka8DTTLROoXmf7oHV0NV8HRMt9QIhRySNXhf46 aT9SDN12nr0Zjx87kbnI+0JsiL0zaDTlnorT4ikKhk23UjZAGAFtkEMdrO2VkWyTSL DIq4gkaZEzBZbRbrj4U2+8fXfaZzFDr/9xtHG8uM= x-aol-sid: 3039ac1b03cd5648890c389f X-AOL-IP: 188.192.95.60 X-Scan-Signature: 91e1efbff209cbddb14bc9e018c2cfe8 Subject: Re: LF: Ramped BPSK Content-Type: multipart/mixed; boundary="----=_NextPart_000_0003_01D11FB2.39CE5BC0" 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: 5092 Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0003_01D11FB2.39CE5BC0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0004_01D11FB2.39CE5BC0" ------=_NextPart_001_0004_01D11FB2.39CE5BC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable >> the humiliation of being a significant part of a mHz off QRG, ;-) The upside is that such offsets are perfectly deterministic. = Knowing your clocking scheme, and assuming that your controller always = rounds to the next-lower frequency word, we find that 137477 is low at = -629 uHz low, and 137777 only -91 uHz, apparently matching = observations. If you had chosen nearest integer rounding, 137477 would = have been somewhat closer at +244 uHz ;-) In the context of using PSK / Wolf modes with nonlinear amplifiers, = DL4YHF had long ago included a continuous phase ramp option in SpecLab's = digimode modulator. My conceptual problem is that I never know which way = to swing around - at each transition one has to make an arbitrary = decision between a low or high frequency spike... All the best, Markus (DF6NM) From: jcraig@mun.ca=20 Sent: Saturday, November 14, 2015 9:47 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Ramped BPSK Hi Andy, I was about to solder a dpdt relay across a transformer until I saw your = posting. The DDS here is the 9851 and the 40 bits are loaded serially. If bits 35-39 are changed from 00000 to 00010 the phase will change by 180 degrees and so the soldering iron can be switched off? An AD9852 would spare me the humiliation of being a significant part of a mHz off QRG, but these chips seem hard to get. Markus was right about the resolution. The DDS is clocked at 10 MHz with the x6 multiplier. The output is then divided by 16. The resolution is just under 1 mHz and so the frequency error depends on the output frequency. 73 Joe VO1NA On Sat, 14 Nov 2015, Andy Talbot wrote: > Try the Anlaog Devices web site - www.analog.com > > I built my own PCB, http://www.g4jnt.com/AD9852module.pdf (PCBs = are no > longer available for that, though). That particular DDS is a bit out = of > date now. I use it for this job as I have a few modules left, and it = is > one of the few devices with both a 48 bit frequency setting register = and > amplitude programmability. > > Andy G4JNT > > On 14 November 2015 at 19:20, Paul Nicholson = wrote: > >> >> With sufficiently brief phase steps, those discrete sidebands >> will fall outside the loading coil bandwidth and be well >> attenuated. >> >> But, does that bring back the audible clicks from the PA >> and coil? >> >> I'm keen to have a play with these DDS chips. Is there a >> recommended evaluation board? >> >> -- >> Paul Nicholson >> -- >> >> > ------=_NextPart_001_0004_01D11FB2.39CE5BC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
>> the=20 humiliation of being a significant part of a mHz off = QRG,
 
;-)   The=20 upside is that such offsets are perfectly deterministic. Knowing = your=20 clocking scheme, and assuming that your controller always rounds to the=20 next-lower frequency word, we find that 137477 is low at -629 = uHz=20 low, and 137777 only  -91 uHz, apparently=20 matching observations. If you had chosen nearest integer=20 rounding, 137477 would have been somewhat closer at +244 uHz = ;-)
 
In the context of using PSK / Wolf = modes with=20 nonlinear amplifiers, DL4YHF had long ago included a continuous = phase ramp=20 option in SpecLab's digimode modulator. My conceptual problem is that I = never=20 know which way to swing around - at each transition one has to make=20 an arbitrary decision between a low or high frequency=20 spike...
 
 
All the best,
Markus (DF6NM)
 
 

From: jcraig@mun.ca
Sent: Saturday, November 14, 2015 9:47 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: Ramped BPSK

Hi Andy,

I was about to solder a dpdt relay across = a=20 transformer until I saw your
posting.  The DDS here is the 9851 = and the=20 40 bits are loaded serially.
If bits 35-39 are changed from 00000 to = 00010=20 the phase will change by
180 degrees and so the soldering iron can be = switched off?

An AD9852 would spare me the humiliation of being a = significant
part of a mHz off QRG, but these chips seem hard to = get. =20 Markus was
right about the resolution. The DDS is clocked at 10 MHz = with=20 the
x6 multiplier. The output is then divided by 16.  The = resolution is=20 just
under 1 mHz and so the frequency error depends on the output=20 frequency.

73 Joe VO1NA



On Sat, 14 Nov 2015, Andy = Talbot=20 wrote:

> Try the Anlaog Devices web site - www.analog.com
>
> I = built my own=20 PCB,   http://www.g4jnt.com/AD985= 2module.pdf  =20 (PCBs are no
> longer available for that, though).  That = particular=20 DDS is a bit out of
> date now.  I use it  for this job = as I=20 have a few modules left, and it is
> one of the few devices  = with=20 both a 48 bit frequency setting register and
> amplitude=20 programmability.
>
> Andy  G4JNT
>
> On 14 = November=20 2015 at 19:20, Paul Nicholson <vlf0403@abelian.org>=20 wrote:
>
>>
>> With sufficiently brief phase = steps,=20 those discrete sidebands
>> will fall outside the loading coil=20 bandwidth and be well
>> attenuated.
>>
>> = But, does=20 that bring back the audible clicks from the PA
>> and=20 coil?
>>
>> I'm keen to have a play with these DDS=20 chips.  Is there a
>> recommended evaluation=20 board?
>>
>> --
>> Paul Nicholson
>> = --
>>
>>
>

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