Return-Path: X-Spam-DCC: paranoid 1290; 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=0.1 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE,HTML_TINY_FONT,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 u2TGd779001995 for ; Tue, 29 Mar 2016 18:39:07 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1akwSv-00025L-Ek for rs_out_1@blacksheep.org; Tue, 29 Mar 2016 17:26:01 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1akwSu-00025C-NW for rsgb_lf_group@blacksheep.org; Tue, 29 Mar 2016 17:26:00 +0100 Received: from mail-vk0-x22c.google.com ([2607:f8b0:400c:c05::22c]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1akwSq-0000ID-Rx for rsgb_lf_group@blacksheep.org; Tue, 29 Mar 2016 17:25:59 +0100 Received: by mail-vk0-x22c.google.com with SMTP id e6so25299903vkh.2 for ; Tue, 29 Mar 2016 09:25:56 -0700 (PDT) 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=nfqhFabj9rwFWj8uXyFVQzTtUqmoRmfZDpR7Zecqf1M=; b=XaXqnVrCDkH+4A9uAVfpp3xU9DkHUQihwMMAdRvCnEAxWE4UIx2PMzbV0zsFk95w1q Q2v67QCKymheFc2Oxfs9s4L4+t5agTbNa0F457l6HYcDqowMKAhcvcFs9OpzOozOvqTy tRpQQ1Imo8dbHeZBV29RUXghlSCYzQZgvNJO/8ffB8tSZ8ShYPskJD3bjk53xW34MzYK es8dMtNJswUBK334t5lLBdQCAKOI4DN4z6k+tGnptpTRf0e5TYgUvZqHozsh1ZkSRH3B Phsj6TFTo++2KDVmIPsTQFPfN3OzkcapeR6nbTlPwtK1b/YhKBpx8uxadOuko0O45LIA ZyXg== 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=nfqhFabj9rwFWj8uXyFVQzTtUqmoRmfZDpR7Zecqf1M=; b=TB6duTgD7hGwCjnegdyhiFxXuZan+h5zgyfrcpMhhErz7HxKBzU5qrWmEbiW+zub2P 7TvLKmjKkAcEvaz4vDyqbj0CBY9iqnrHKvI0AHCDvnPtzbtdcXOdUzQrtAB/vQb8CYZ2 SaRu1v5nFTb/vV0VOPTSlvVGTLrgkqkDKYwA2V2ibPNwNN3jYH+fjbMrZ8D43GclHWLA 0PRKsFOFhyjemerFndEzv7wiKYqcRNTcI7AnuvjsNDdZ8mNq4buerJTpQ8IvKpoul0Ur AS+/IA+H4yu/Rd8y4LQUz7we7ufK+dS2etrV/eo7EuYoVIt/Q5q70IAEHvnHv+BMmgLT NvyA== X-Gm-Message-State: AD7BkJJZj0Q4HRXojWMXZmdfpnNwvoUALjyv+rxOW9/qb4If3m6cO9CgvnjAsnAosoaVpSinmcXICqza53s5ZA== MIME-Version: 1.0 X-Received: by 10.31.146.5 with SMTP id u5mr1679390vkd.19.1459268754238; Tue, 29 Mar 2016 09:25:54 -0700 (PDT) Received: by 10.159.32.198 with HTTP; Tue, 29 Mar 2016 09:25:54 -0700 (PDT) In-Reply-To: References: <094E96255B2D4EE9886317C115E7E5D9@Clemens0811> Date: Tue, 29 Mar 2016 17:25:54 +0100 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 2564d1127b7f89f7bcf8bd7389b6d10b Subject: Re: [rsgb_lf_group] RE: Cheap and nasty sources - was LF: DK7FC WSPR bad quality problem Content-Type: multipart/alternative; boundary=001a1143adccba74c8052f327b2e 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: 7513 --001a1143adccba74c8052f327b2e Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Completely predictable. It how you write the code. I have all the WSJT modes running from PICs, driving a variety of different frequency sources. All timing is derived from a timer interrupt, which for most of the modes is the 10Mhz crystal divided by 4096 =3D Sending prestored messages for beacon use (symbols calculated off lin with a separate utility then stored in the PIC) JT4 for AD9850/51 and AD985 DDS chips and LMX2541 Fract-N synth JT65 for ditto WSPR for AD9852 ISCAT for LMX2541 JT9 for AD9852 (new) PSK31 for AD9852 (that DDS has 12 bit programmable amplitude) And now, real time modes where the symbols are generated in the PIC code and message data is input to it: Real time JT4 transmitting compressed lat/long (See RadCom Plus recently) JT4 from LMX2541 and now, as of two days ago, real time JT9 from AD9850/51 None of these are plug-n-play. You need to assemble and adapt your own PIC code, but the source code is all on my website for anyone to use - although there will be a bit of a delay before the JT9 stuff appears there Andy G4JNT On 29 March 2016 at 13:54, Graham wrote: > Andy > PIC > > If the execute times of PIC routines are not subject to IRQ ..or > if they are , could be in a predictable pattern , assuming nothing else > was 'going on' > > Then , the PIC alone would produce a reasonable drive [ square wave > or pulse] for a class e/d logic divider chain , there being no > need [lf/mf] for the ppl or dds ? > > how fast , will a pic run? > > 73-G, > > > > *From:* Andy Talbot > *Sent:* Sunday, March 27, 2016 9:04 PM > *To:* rsgb_lf_group@yahoogroups.co.uk > *Cc:* rsgb_lf_group@blacksheep.org > *Subject:* Re: [rsgb_lf_group] RE: Cheap and nasty sources - was LF: > DK7FC WSPR bad quality problem > > If you are referring to the close spaced lines making up the spectrum of > the two strong signals, from teh plot you show they appear to be about > 1.5Hz spacing. This is the WSPR symbol rate (actually 1.465Hz) so the > lines visible are the natural sidebands from the WSPR waveform. > > I'd be surprised if an DDS itself were generating 100Hz sidebands on its > own. Especially a more modern one like the AD9859. Even the venerabl= e > AD9850 doesn't generate stuff only 40dB down. So I'd still look for > other means of 100Hz leakage. Perhaps getting onto the reference sourc= e. > I assume the two stations both reporting 100Hz sidebands are using > identical generating hardware ? > > I use an AD9852 for WSPR and generationg MFSK modes generally, a device > perhaps bit a bit older than the AD9859, but the same family, and it is > certainly clean down to at least -60dBc. When driven from a higher cloc= k > frequency, better still. > > Andy G4JNT > > > On 27 March 2016 at 19:47, 'Clemens Paul' cpaul@gmx.net [rsgb_lf_group] < > rsgb_lf_group@yahoogroups.co.uk> wrote: > >> >> >> Hello all, >> >> I've been watching the 100Hz sideband WSPR multi-decodes also from the >> other two strong stations on MW, >> DH5RAE and DB0ABR.They are located about 65km from me and generate S9++d= B >> signals here. >> The deoded sidebands are also about 40dB down. >> DB0ABR has tried a different power supply to no avail and both believe >> that the DDS synthesizer is the culprit. >> It is a AD9859,see >> http://www.dj0abr.de/index_english.html >> I have added a perseus screenshot with a bin width of 0.24Hz showing >> strange lines in their signal. >> I'm not sure if this is the DDS spectrum what we see here. >> >> 73 >> Clemens >> DL4RAJ >> >> >-----Original Message----- >> >From: owner-rsgb_lf_group@blacksheep.org >> >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Andy Talbot >> >Sent: Sunday, March 27, 2016 8:06 PM >> >To: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk >> >Subject: Cheap and nasty sources - was LF: DK7FC WSPR bad >> >quality problem >> > >> >It is unfortunate these cheap and simple low power solutions >> >have come-about at all. The originators who worked out how >> >to generate a few milliwatts of Rf from very non-purpose >> >designed hardware presumably never anticipated that eh great >> >masses would end up connecting this unsuitable kit to high >> >power amplifiers. I hope they only ever anticipated their >> >being used for very low power uses. >> > >> >As for the R-PI, that really does look like a bad way of >> >generating narrow band RF. I don't know the details of its >> >internal hardare, but strongly suspect that it uses a >> >jittering Fract-N route to generating arbitrary frequencies. >> > Again, fine for a few milliwats of test signal, but >> >certainly not for amplification to hundreds of milliwatts. >> > >> >If you want a decent high power source, use a DDS chip or a >> >modern Fract-N synthesizer like the LMX2541. That device has >> >an internal VCO and an output divider that allows it to >> >generate as low as 35MHz - and then any external CMSO divider >> >will allow you to go lower. And they are CLEAN - especially >> >so when divided down to LF / HF >> > >> > >> >Andy G4JNT >> > >> > >> > >> > >> >On 27 March 2016 at 18:14, Graham wrote: >> > >> > >> > >> > Andy, >> > >> > This time its not really Stefan's fault :-,) >> > >> > This is a problem , using the raspberry PI , the Pi >> >processor uses interrupts, which, cause the execution time >> >of the timing loops to vary slightly , >> > the 'small' time variations , produce side bands . >> > >> > This was evident during the development of a R-PI >> >routine for sending Opera , as the R-Pi support >> >documentation is not particularly comprehensive, its 'not' >> >possible to fully address the i/o functions and as such >> >there exists a conflict with higher order irq requests . >> >Producing seemingly random widening of the spectrum, >> >depending on the irq deployments. >> > >> > Ie the pulse train suffers from timing jitter >> > >> > The alterative of the U3 beacon key'er , driving >> >the DDS 'oscillator' is a more elegant solution, but as >> >noted by Andy [rad-com] some time back, the later U3 with >> >the PPL suffers from settling time issues , when >> >commanded with , step frequency changes. these sever to >> >produce sidebands , at the step changes. >> > >> > 73-G, >> > >> > >> > From: F6CNI - Andy - JN19QB >> > Sent: Saturday, March 26, 2016 8:36 PM >> > To: RSGB LF Group >> > Subject: LF: DK7FC WSPR bad quality problem >> > >> > >> > Hello Stefan. >> > >> > >> > >> > I am sorry, but this evening you have a very poor >> >quality WSPR signal on MF with many splatters, I think it is >> >perhaps due to an overload TX AF level. >> > >> > >> > >> > That is not in phase with the normal ham spirit. So, >> >please be kind to stop now your transmission and correct this problem. >> > >> > >> > >> > On the way, can you say honnestly if your power is not >> >over the legal limit ? >> > >> > >> > >> > Sincerly yours and my best 73 de Andy. >> > >> > >> > >> > P.S. >> > >> > >> > >> > Have a look below at some reports last hour showing the >> >problem : >> > >> > >> > >> > >> > >> >2016-03-26 19:00 >> > >> >DK7FC >> > >> >0.475683 >> > >> >+12 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >PI4THT >> > >> >JO32kf >> > >> >336 >> > >> >338 >> > >> >2016-03-26 19:00 >> > >> >DK7FC >> > >> >0.475783 >> > >> >-25 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >PI4THT >> > >> >JO32kf >> > >> >336 >> > >> >338 >> > >> >2016-03-26 18:50 >> > >> >DK7FC >> > >> >0.475783 >> > >> >-23 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >PE1RKT >> > >> >JO22fb >> > >> >418 >> > >> >316 >> > >> >2016-03-26 18:50 >> > >> >DK7FC >> > >> >0.475683 >> > >> >+14 >> > >> >1 >> > >> >JN49ik >> > >> >1 >> > >> >PE1RKT >> > >> >JO22fb >> > >> >418 >> > >> >316 >> > >> >2016-03-26 18:40 >> > >> >DK7FC >> > >> >0.475683 >> > >> >+12 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >LA8AV >> > >> >JO59cs >> > >> >1153 >> > >> >4 >> > >> >2016-03-26 18:40 >> > >> >DK7FC >> > >> >0.475783 >> > >> >-24 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >LA8AV >> > >> >JO59cs >> > >> >1153 >> > >> >4 >> > >> >2016-03-26 18:50 >> > >> >DK7FC >> > >> >0.475783 >> > >> >-28 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >LA3JJ >> > >> >JO59bh >> > >> >1102 >> > >> >4 >> > >> >2016-03-26 18:50 >> > >> >DK7FC >> > >> >0.475683 >> > >> >+10 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >LA3JJ >> > >> >JO59bh >> > >> >1102 >> > >> >4 >> > >> >2016-03-26 18:40 >> > >> >DK7FC >> > >> >0.475780 >> > >> >-28 >> > >> >1 >> > >> >JN49ik >> > >> >1 >> > >> >G3KEV >> > >> >IO94sh >> > >> >829 >> > >> >314 >> > >> >2016-03-26 18:40 >> > >> >DK7FC >> > >> >0.475679 >> > >> >+10 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >G3KEV >> > >> >IO94sh >> > >> >829 >> > >> >314 >> > >> >2016-03-26 19:10 >> > >> >DK7FC >> > >> >0.475682 >> > >> >+13 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >F6CNI >> > >> >JN19qb >> > >> >389 >> > >> >266 >> > >> >2016-03-26 19:10 >> > >> >DK7FC >> > >> >0.475782 >> > >> >-27 >> > >> >1 >> > >> >JN49ik >> > >> >1 >> > >> >F6CNI >> > >> >JN19qb >> > >> >389 >> > >> >266 >> > >> >2016-03-26 18:30 >> > >> >DK7FC >> > >> >0.475682 >> > >> >+15 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >F5WK >> > >> >JN18hp >> > >> >452 >> > >> >261 >> > >> >2016-03-26 18:30 >> > >> >DK7FC >> > >> >0.475782 >> > >> >-22 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >F5WK >> > >> >JN18hp >> > >> >452 >> > >> >261 >> > >> >2016-03-26 18:00 >> > >> >DK7FC >> > >> >0.475680 >> > >> >+19 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >DL6II >> > >> >JO30nx >> > >> >205 >> > >> >327 >> > >> >2016-03-26 18:00 >> > >> >DK7FC >> > >> >0.475780 >> > >> >-18 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >DL6II >> > >> >JO30nx >> > >> >205 >> > >> >327 >> > >> >2016-03-26 18:50 >> > >> >DK7FC >> > >> >0.475682 >> > >> >+17 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >DL4RAJ/2 >> > >> >JN68kj >> > >> >326 >> > >> >109 >> > >> >2016-03-26 18:50 >> > >> >DK7FC >> > >> >0.475782 >> > >> >-22 >> > >> >0 >> > >> >JN49ik >> > >> >1 >> > >> >DL4RAJ/2 >> > >> >JN68kj >> > >> >326 >> > >> >109 >> > >> > >> > >> > >> > >> __._,_.___ >> ------------------------------ >> Posted by: "Clemens Paul" >> ------------------------------ >> Reply via web post >> >> =E2=80=A2 Reply to sender >> >> =E2=80=A2 Reply to group >> >> =E2=80=A2 Start a new topic >> >> =E2=80=A2 Messages in this topic >> >> (2) >> Visit Your Group >> >> >> - New Members >> >> 1 >> >> [image: Yahoo! Groups] >> >> =E2=80=A2 Privacy >> =E2=80=A2 Unsubscribe >> =E2= =80=A2 Terms >> of Use >> >> . >> >> __,_._,___ >> > > --001a1143adccba74c8052f327b2e Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Completely predictable.=C2=A0=C2=A0 It how you write = the code.=C2=A0=C2=A0

I have all the WSJT modes ru= nning from PICs, driving a variety of different frequency sources.=C2=A0 Al= l timing is derived from a timer interrupt, which for most of the modes is = the 10Mhz crystal divided by 4096 =3D

Sending pre= stored messages for beacon use (symbols=C2=A0calculated off lin with a sepa= rate utility then stored in the PIC)

=C2=A0JT4 for= AD9850/51 and AD985 DDS chips =C2=A0=C2=A0=C2=A0and =C2=A0LMX2541 Fract-N = synth
=C2=A0JT65 for ditto
=C2=A0WSPR for=C2=A0 AD9852 =
=C2=A0ISCAT for=C2=A0 LMX2541
=C2=A0JT9 for AD9852 (ne= w)
=C2=A0PSK31 for AD9852 (that DDS has 12 bit programmable ampl= itude)

And now, real time modes where the symbols = are generated in the PIC code and message data is input to it:
=C2=A0Real time JT4 transmitting compressed lat/long (See RadC= om Plus=C2=A0recently)
=C2=A0=C2=A0=C2=A0 JT4 from LMX2541
<= div>=C2=A0=C2=A0=C2=A0 =C2=A0and now, as of two days ago,=C2=A0 real time J= T9 from AD9850/51


None of these are= plug-n-play.=C2=A0 You need to assemble and adapt your own PIC code, but= =C2=A0 the source code is all on my website for anyone to use - although th= ere will be a bit of a delay before the JT9 stuff appears there
<= br>
Andy=C2=A0 G4JNT



=

On 29 March= 2016 at 13:54, Graham <g8fzk@g8fzk.fsnet.co.uk> wrote= :
Andy > PIC
=C2=A0
If the=C2=A0 execute=C2=A0 times=C2=A0 of PIC=C2=A0 routines=C2=A0 are= =20 not=C2=A0 subject to=C2=A0=C2=A0 IRQ=C2=A0 ..or if they are , could be=C2= =A0 in=20 a predictable pattern , assuming=C2=A0 nothing else was 'going on' = =C2=A0
=C2=A0
Then , the=C2=A0 PIC alone=C2=A0 would=C2=A0 produce a reasonable=20 drive=C2=A0 [ square=C2=A0 wave or=C2=A0 pulse] =C2=A0 for=C2=A0 a=C2=A0=C2= =A0=20 class e/d=C2=A0 logic divider=C2=A0 chain , there=C2=A0 being=C2=A0 no=C2= =A0=20 need=C2=A0 [lf/mf]=C2=A0=C2=A0 for the=C2=A0 ppl or dds ?
=C2=A0
how fast , will=C2=A0 a=C2=A0 pic run?
=C2=A0
73-G,
=C2=A0

=C2=A0

If you are referring to the close spaced lines making up t= he=20 spectrum of the two strong signals, from teh plot you show they appear to b= e=20 about 1.5Hz spacing.=C2=A0 This is the WSPR symbol rate =C2=A0(actually 1.4= 65Hz)=20 so the lines visible are the natural sidebands from the WSPR waveform.=20

I'd be surprised if an DDS itself were generating 100Hz sidebands = on its=20 own. =C2=A0 Especially a more modern one like the AD9859. =C2=A0 =C2=A0Even= the=20 venerable AD9850 doesn't generate stuff only 40dB down. =C2=A0 =C2=A0So= I'd=20 still look for other means of 100Hz leakage. =C2=A0 Perhaps getting onto=20 =C2=A0the reference source. =C2=A0 =C2=A0 I assume the two stations both=20 reporting 100Hz sidebands are using identical generating hardware ?

I use an AD9852 for WSPR and generationg MFSK modes generally, a devic= e=20 perhaps bit a bit older than the AD9859, but the same family, and it is=20 certainly clean down to at least -60dBc. =C2=A0 When driven from a higher c= lock=20 frequency, better still.

Andy =C2=A0G4JNT


On 27 March 2016 at 19:47, 'Clemens Paul'= ; cpaul@gmx.net [rsg= b_lf_group] <rsgb_lf_group@yahoogroups.co.uk> = wrote:
=C2=A0=20

Hello all,

I've been watching the 100Hz sideband WSPR multi= -decodes=20 also from the other two strong stations on MW,
DH5RAE and DB0ABR.They = are=20 located about 65km from me and generate S9++dB signals here.
The deode= d=20 sidebands are also about 40dB down.
DB0ABR has tried a different power= =20 supply to no avail and both believe that the DDS synthesizer is the=20 culprit.
It is a AD9859,see
http://www.dj0abr.de/index_english.html<= br>I have added a=20 perseus screenshot with a bin width of 0.24Hz showing strange lines in th= eir=20 signal.
I'm not sure if this is the DDS spectrum what we see=20 here.

73
Clemens
DL4RAJ

>-----Original=20 Message-----
>From: owner-rsgb_lf_group@blacksheep.org
>[ma= ilto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Andy=20 Talbot
>Sent: Sunday, March 27, 2016 8:06 PM
>To: rsgb_lf_group@blacks= heep.org; rsgb_lf_group@yahoogroups.co.uk
>Subject: Cheap and=20 nasty sources - was LF: DK7FC WSPR bad
>quality=20 problem
>
>It is unfortunate these cheap and simple low power= =20 solutions
>have come-about at all. The originators who worked out = how=20
>to generate a few milliwatts of Rf from very non-purpose=20
>designed hardware presumably never anticipated that eh great=20
>masses would end up connecting this unsuitable kit to high=20
>power amplifiers. I hope they only ever anticipated their=20
>being used for very low power uses.
>
>As for the R-P= I,=20 that really does look like a bad way of
>generating narrow band RF= . I=20 don't know the details of its
>internal hardare, but strongly = suspect=20 that it uses a
>jittering Fract-N route to generating arbitrary=20 frequencies.
> Again, fine for a few milliwats of test signal, but= =20
>certainly not for amplification to hundreds of=20 milliwatts.
>
>If you want a decent high power source, use a = DDS=20 chip or a
>modern Fract-N synthesizer like the LMX2541. That devic= e has=20
>an internal VCO and an output divider that allows it to=20
>generate as low as 35MHz - and then any external CMSO divider=20
>will allow you to go lower. And they are CLEAN - especially
&= gt;so=20 when divided down to LF / HF
>
>
>Andy=20 G4JNT
>
>
>
>
>On 27 March 2016 at 18:14, G= raham=20 <g8fzk@g8= fzk.fsnet.co.uk> wrote:
>
>
>=20
> Andy,
>
> This time its not really Stefan's fau= lt=20 :-,)
>
> This is a problem , using the raspberry PI , the Pi= =20
>processor uses interrupts, which, cause the execution time
&g= t;of=20 the timing loops to vary slightly ,
> the 'small' time vari= ations ,=20 produce side bands .
>
> This was evident during the develop= ment=20 of a R-PI
>routine for sending Opera , as the R-Pi support=20
>documentation is not particularly comprehensive, its 'not'= ;=20
>possible to fully address the i/o functions and as such
>t= here=20 exists a conflict with higher order irq requests .
>Producing seem= ingly=20 random widening of the spectrum,
>depending on the irq deployments= .=20
>
> Ie the pulse train suffers from timing jitter
>= =20
> The alterative of the U3 beacon key'er , driving
>the= DDS=20 'oscillator' is a more elegant solution, but as
>noted by = Andy=20 [rad-com] some time back, the later U3 with
>the PPL suffers from= =20 settling time issues , when
>commanded with , step frequency chang= es.=20 these sever to
>produce sidebands , at the step changes.
>= =20
> 73-G,
>
>
> From: F6CNI - Andy - JN19QB=20 <mailto:f6cni@ora= nge.fr>
> Sent: Saturday, March 26, 2016=20 8:36 PM
> To: RSGB LF Group <mailto:rsgb_lf_group@blacksheep.org> =
> Subject: LF: DK7FC=20 WSPR bad quality problem
>
>
> Hello Stefan.
>>=20
>
> I am sorry, but this evening you have a very poor=20
>quality WSPR signal on MF with many splatters, I think it is=20
>perhaps due to an overload TX AF level.
>
>=20
>
> That is not in phase with the normal ham spirit. So,=20
>please be kind to stop now your transmission and correct this=20 problem.
>
>
>
> On the way, can you say honnest= ly if=20 your power is not
>over the legal limit ?
>
>=20
>
> Sincerly yours and my best 73 de Andy.
>
>= =20
>
> P.S.
>
>
>
> Have a look below= at=20 some reports last hour showing the
>problem :
>
>=20
>
>
>
>2016-03-26 19:00
>
>DK7FC= =20
>
>0.475683
>
>+12
>
>0=20
>
>JN49ik
>
>1
>
>PI4THT=20
>
>JO32kf
>
>336
>
>338=20
>
>2016-03-26 19:00
>
>DK7FC=20
>
>0.475783
>
>-25
>
>0=20
>
>JN49ik
>
>1
>
>PI4THT=20
>
>JO32kf
>
>336=20
>
>338
>
>2016-03-26 18:50
>
>DK7FC= =20
>
>0.475783
>
>-23
>
>0=20
>
>JN49ik
>
>1
>
>PE1RKT=20
>
>JO22fb
>
>418
>
>316=20
>
>2016-03-26 18:50
>
>DK7FC=20
>
>0.475683
>
>+14
>
>1=20
>
>JN49ik
>
>1
>
>PE1RKT=20
>
>JO22fb
>
>418=20
>
>316
>
>2016-03-26 18:40
>
>DK7FC= =20
>
>0.475683
>
>+12
>
>0=20
>
>JN49ik
>
>1
>
>LA8AV=20
>
>JO59cs
>
>1153
>
>4=20
>
>2016-03-26 18:40
>
>DK7FC=20
>
>0.475783
>
>-24
>
>0=20
>
>JN49ik
>
>1
>
>LA8AV=20
>
>JO59cs
>
>1153
>
>4=20
>
>2016-03-26 18:50
>
>DK7FC=20
>
>0.475783
>
>-28
>
>0=20
>
>JN49ik
>
>1
>
>LA3JJ=20
>
>JO59bh
>
>1102
>
>4=20
>
>2016-03-26 18:50
>
>DK7FC=20
>
>0.475683
>
>+10
>
>0=20
>
>JN49ik
>
>1
>
>LA3JJ=20
>
>JO59bh
>
>1102
>
>4=20
>
>2016-03-26 18:40
>
>DK7FC=20
>
>0.475780
>
>-28
>
>1=20
>
>JN49ik
>
>1
>
>G3KEV=20
>
>IO94sh
>
>829
>
>314=20
>
>2016-03-26 18:40
>
>DK7FC=20
>
>0.475679
>
>+10
>
>0=20
>
>JN49ik
>
>1
>
>G3KEV=20
>
>IO94sh
>
>829
>
>314=20
>
>2016-03-26 19:10
>
>DK7FC=20
>
>0.475682
>
>+13
>
>0=20
>
>JN49ik
>
>1
>
>F6CNI=20
>
>JN19qb
>
>389
>
>266=20
>
>2016-03-26 19:10
>
>DK7FC=20
>
>0.475782
>
>-27
>
>1=20
>
>JN49ik
>
>1
>
>F6CNI=20
>
>JN19qb
>
>389
>
>266=20
>
>2016-03-26 18:30
>
>DK7FC=20
>
>0.475682
>
>+15
>
>0=20
>
>JN49ik
>
>1
>
>F5WK=20
>
>JN18hp
>
>452
>
>261=20
>
>2016-03-26 18:30
>
>DK7FC=20
>
>0.475782
>
>-22
>
>0=20
>
>JN49ik
>
>1
>
>F5WK=20
>
>JN18hp
>
>452
>
>261=20
>
>2016-03-26 18:00
>
>DK7FC=20
>
>0.475680
>
>+19
>
>0=20
>
>JN49ik
>
>1
>
>DL6II=20
>
>JO30nx
>
>205
>
>327=20
>
>2016-03-26 18:00
>
>DK7FC=20
>
>0.475780
>
>-18
>
>0=20
>
>JN49ik
>
>1
>
>DL6II=20
>
>JO30nx
>
>205
>
>327=20
>
>2016-03-26 18:50
>
>DK7FC=20
>
>0.475682
>
>+17
>
>0=20
>
>JN49ik
>
>1
>
>DL4RAJ/2=20
>
>JN68kj
>
>326
>
>109=20
>
>2016-03-26 18:50
>
>DK7FC=20
>
>0.475782
>
>-22
>
>0=20
>
>JN49ik
>
>1
>
>DL4RAJ/2=20
>
>JN68kj
>
>326
>
>109
>>=20
>
>
>

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