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Content preview: Good luck Luis, Later, for a QSO mode, i would suggest rather
to use 8K19A than 4K19A. As far as i understand this will have more 'coding
gain'. As soon as it all works, it becomes quite easy. In Linux one could
even run a script doing all the file preparation and decoding automatically,
as demonstrated by Domenico. You just need to watch the screen, like in FT8
;-) [...]
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Subject: Re: LF: The return of EbNaut for Dummies
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Good luck Luis,
Later, for a QSO mode, i would suggest rather to use 8K19A than 4K19A.
As far as i understand this will have more 'coding gain'.
As soon as it all works, it becomes quite easy.
In Linux one could even run a script doing all the file preparation and
decoding automatically, as demonstrated by Domenico. You just need to
watch the screen, like in FT8 ;-)
73, Stefan
Am 11.09.2018 18:47, schrieb VIGILANT Luis FernĂĄndez:
>
> Hi Markus
>
> Noted
>
> Very interesting. So I can reduce the interval between generated files
> just changing the âWaterfall scroll intervalâ at a fixed value as 5
> minutes for example
>
> I had it configured automatic at 75% overlap, so that was changing
> depending on FFT values and then always getting different interval
> between files
>
> Good to see the âlightâ J
>
> Letâs see if Iâm able to get a decode now
>
> 73 de Luis
>
> EA5DOM
>
> *De:* owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] *En nombre de *Markus Vester
> *Enviado el:* martes, 11 de septiembre de 2018 18:13
> *Para:* rsgb_lf_group@blacksheep.org
> *Asunto:* Re: LF: The return of EbNaut for Dummies
>
> Yes Luis that scheme should work.
>
> The 10 minute interval for file generation is not hardwired but
> simply the scroll interval, as chosen in the "options - Spectrum
> display settings" menu. Each column in the spectrogram produces one
> file. You can set faster scrolling (at the cost of more data written
> to the disk), possibly allowing you to decode and answer sooner in a
> QSO setting.
>
> Whether an EbNaut transmission is completely contained in a file also
> depends on the time when SpecLab was started up, initiating
> the sequence of files. If the transmission duration is shorter than
> file duration minus scroll interval (e.g. 38-10 = 28 minutes), there
> will be at least one file containing the full transmission. But
> the EbNaut decoder will also work well with recordings which have been
> truncated at either or both ends, albeit with some loss of sensitivity.
>
> Best 73,
> Markus
>
>
>
> -----UrsprĂźngliche Mitteilung-----
> Von: VIGILANT Luis FernĂĄndez <luis@vigilant.es <mailto:luis@vigilant.es>>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org
> <mailto:rsgb_lf_group@blacksheep.org>>
> Verschickt: Di, 11. Sept 2018 17:54
> Betreff: RE: LF: The return of EbNaut for Dummies
>
> Hi Stefan, Markus, EbNaut
>
> Thank you for the detailed explanations. Now I really understand the
> configuration and how is related to bandwith and length of the
>
> recorded files. There is also a fixed time between files recorded and
> it is always 10 minutes. But, files are overlapped, so there you can
>
> record a file to contain longer than 10 minute transmission
>
> So, letâs see which would be a good configuration to perform a real
> QSO. Lets say in LF with some S/N and not al VLF levels
>
> At the same time can be a good exercise to check if I finally
> understood all this stuff ;-)
>
> Tx at 4K19A/CRC16/1 sec symbol rate would take 9 min and 4 sec to
> transmit 17 characters messages
>
> Assume 15 minutes periods. Lets say first (even) transmitting at the
> hour and 30 min pass the hour
>
> Second (odd) transmits at minute 15 and 45
>
> Rx at 44100 sample rate, using a 65536 FFT length, and 1536
> decimation, file will contain 38 minutes of recorded signal. Looks
> more than enough
>
> as we are using about 9 minutes transmissions. Then bandwidth of the
> recorded files will be âSample rate / decimationâ
>
> 44100 / 1536 = 28.71 and then divided by two as SLab generates the
> file, ending with 14.35Hz. Which is enough bandwith for a 1 sec symbol
> rate (10/1=10Hz)
>
> So, assume both stations had Rx running previously and SL already
> producing files every 10 minutes. Files will contain 38 minutes of
> recorded signal
>
> A file recorded by windows just after transmission end (lets say)
> 22:10 would contain a record of 38minutes, so starting time will be
> really 21:32
>
> This file will contain the message transmited by the station calling
> in first period (CQ). To decode it we will select a timeshift from
> 21:32 to 22:00 = 28 minutes
>
> So there will be time enough to decode the message and then prepare
> the transmitter to answer in second period, 15 minutes pass the hour,
> 22:15
>
> answering the CQ of the station calling first
>
> The station calling in first period should have to check for files
> recorded at about 22:25 to try to decode an answer
>
> And then prepare the corresponding transmission for next even period
> at 22:30
>
> Should this timing schem work for QSOs ? Assuming there is enough S/N
> to work at this Tx rate of course
>
> 73 de Luis
>
> EA5DOM
>
> *De:* owner-rsgb_lf_group@blacksheep.org
> <mailto:rsgb_lf_group@blacksheep.org>
> [mailto:owner-rsgb_lf_group@blacksheep
> <mailto:owner-rsgb_lf_group@blacksheep?>.org] *En nombre de *DK7FC
> *Enviado el:* martes, 11 de septiembre de 2018 15:13
> *Para:* rsgb_lf_group@blacksheep.org <mailto:rsgb_lf_group@blacksheep.org>
> *Asunto:* Re: LF: The return of EbNaut for Dummies
>
> Hi Luis,
>
> As Markus mentioned...
> And see the attachment. In the example i set the sample rate to 44100
> Hz. If you have a downconverter with an LO of 120 kHz, and expect a
> message on 137 kHz exactly, set the internal frequency shift to a
> center frequency of 17 kHz, like shown in the image.
>
> Also remember that the number of exported FFT bins in the FFT export
> register card should be set to the half of the FFT input size shown in
> the FFT register card.
>
> Keep us informed about the success :-)
>
> I'm waiting for your first message to receive here. I'm monitoring
> permanently, however only in the range 137.5 kHz +- 50 Hz and only
> about 30 minutes message length. Other parameters would work too, but
> i need to prepare a special SL instance then...
>
> 73, Stefan
>
>
>
> Am 11.09.2018 13:40, schrieb VIGILANT Luis FernĂĄndez:
>
> Hi Stefan
>
> Thank you for the detailed explanation. I prefer to understand the
> process rather than getting a working .usr
>
> So, excuse me again for dumming again J
>
> All understood about the length and relation to FFT windows time
> (length) in SL. Width was un unknown parameter for me
>
> And Iâm afraid the problem is about the width:
>
> >> Choose the FFT width and length to suit your settings. The width
> is maybe 10 * 1/(symbol length) or more
>
> Lets say 1Hz minimum for a 10 sec symbol leght, right ?
>
> So, in the FFT configuration window the only way to get
> >1Hz(1.3Hz) for âWidth of one FFT-binâ is to reduce decimation to 1
>
> and then set FFT length to 32768 to get some âFFT window time
> (length)â. But then, the indows time is just 743ms
>
> which will not cover the length of the message at all
>
> Iâm stucked here. Canât get >width with 30 minutes FFT lenghts.
> Iâm using 44.100Hz sample rate L
>
> The FFT input type is âComplex ith internal frequency shiftâ. But
> even using âReal FFT starting at 0Hzâ doesnât improve much
>
> Decimation at 1536 and FFT length 65535 produces âWidth of one
> FFTâ at 438uHz and FFT windows time 38 min. So this time
>
> good length but small width
>
> What Iâm doing wrong ?
>
> 73 de Luis
>
> EA5DOM
>
> *De:* owner-
> <mailto:owner-rsgb_lf_group@blacksheep.org>rsgb_lf_group@blacksheep.org
> <mailto:rsgb_lf_group@blacksheep.org>
> [mailto:owner-rsgb_lf_group@blacksheep.org
> <mailto:owner-rsgb_lf_group@blacksheep.org?>] *En nombre de *DK7FC
> *Enviado el:* lunes, 10 de septiembre de 2018 18:57
> *Para:* rsgb_lf_group@blacksheep.org
> <mailto:rsgb_lf_group@blacksheep.org>
> *Asunto:* Re: LF: The return of EbNaut for Dummies
>
> Hi Luis,
>
> Am 10.09.2018 17:47, schrieb VIGILANT Luis FernĂĄndez:
>
> The fact of getting windows timestamped files which really
> start at a
>
> different time and no aparent indication of when they end âŚ..
> doesn´t help at all
>
> Well, the FFT settings must be so that you cover enough width (in
> Hz) and length (in seconds). The necessary width depends on your
> symbol length. The length is mentioned in the FFT settings
> register card (FFT window time). Choose a rectangular window for
> EbNaut decodes.
> Convert the txt files into wav using Markus tools. Load the wav
> file in the EbNaut decoder and press RUN. Then you will see the
> start time of the file. The end is start time + length. Simple,
> isn't it? :-)
>
> A new txt file is generated in the interval of the scroll time
> (Spectrum (1) ) register card. Usually 30 minutes is fine, or even
> 1 hour on VLF. Then you get a file each 30 minutes. If the FFT
> length is longer than 30 minutes. Your FFT length should be 30
> minutes longer than the transmission length, just to avoid an
> incomplete set of data in a txt file.
>
> Choose the FFT width and length to suit your settings. The width
> is maybe 10 * 1/(symbol length) or more.
>
>
> Is there any way of âfastâ EbNaut when signals are strong ?
>
> I think there are no limits, you can run 0.1 second symbol length.
> But usually it is used for weak signals and stable paths.
>
> I really donât know what to test next.
>
> Send me your .usr file and the EbNaut settings you want to try.
>
> 73, Stefan
>
>
> May be to run ebnaut_tx in test mode, which just changes the
> phase every symbol length
>
> And then, analyze the recorded file with a different tool to
> determine if this phase changes are there ? Can this be easily
> done ?
>
> 73 de Luis
>
> EA5DOM
>
> PS: Congratulations for your amazing test with the guard
> rails. And yes, this is much much harder than EME ! J
>
> *De:* owner-
> <mailto:owner-rsgb_lf_group@blacksheep.org>rsgb_lf_group@blacksheep.org
> <mailto:rsgb_lf_group@blacksheep.org>
> [mailto:owner-rsgb_lf_group@blacksheep.org
> <mailto:owner-rsgb_lf_group@blacksheep.org?>] *En nombre de *DK7FC
> *Enviado el:* viernes, 07 de septiembre de 2018 22:10
> *Para:* rsgb_lf_group@blacksheep.org
> <mailto:rsgb_lf_group@blacksheep.org>
> *Asunto:* Re: LF: EbNaut transmission test in LF
>
> Hello Luis,
>
> Another hint: Try to use 4K19A and a shorter message, like EA5
> or so. Use long symbols, like 10 seconds or longer. Then,
> timing is less critical and you may get a decode and can tune
> to the best Eb/N0 and find out what the timing offset it. It
> would guess it is a timing problem.
>
> 73 Stefan
>
> Am 07.09.2018 13:36, schrieb VIGILANT Luis FernĂĄndez:
>
> Hi Domenico
>
> Sorry, Iâm not transmitting this weekend. Very stormy
> weather here, so the wires are down
>
> I will notice in the reflector any transmission in
> advance. But first want to confirm that all is working ok
>
> So that was the goal of yesterday test
>
> Yes, the XOR is AFTER the 1/10 divider, and working at the
> final frequency 137485 Hz
>
> Your auto-decoder is a great tool. EbNaut is quite tricky
> for average use and needs a lot of details to care about
>
> Of course the reward is great when you get decodes with
> miserable signal levels. There is never free lunch ! ;-)
>
> 73 de Luis
>
> EA5DOM
>
> *De:* owner-
> <mailto:owner-rsgb_lf_group@blacksheep.org>rsgb_lf_group@blacksheep.org
> <mailto:rsgb_lf_group@blacksheep.org>
> [mailto:owner-rsgb_lf_group@blacksheep.org
> <mailto:owner-rsgb_lf_group@blacksheep.org?>] *En nombre
> de *Domenico IZ7SLZ
> *Enviado el:* viernes, 07 de septiembre de 2018 13:18
> *Para:* rsgb_lf_group@blacksheep.org
> <mailto:rsgb_lf_group@blacksheep.org>
> *Asunto:* Re: LF: EbNaut transmission test in LF
>
> Hello Luis,
>
> thanks for sharing your experiment. My auto-decoder
> https://www.qsl.net/iz7slz/ is already retuned for your
> transmissions.
>
> BTW QRM is large here in the morning time (urban
> location). I will try to catch your signal later in the night.
>
> /At least the decoder is detecting the carrier but may be
> there is no proper phase modulation or probably other
> failures/
>
> /What Iâm doing wrong ? Can anybody decode the message
> from the file ?/
>
> I also suspect some issues on modulator circuit. Of
> course the XOR gate is following the /10 divider, is it?
>
> Good luck.
>
> 73 all,
>
> Domenico/IZ7SLZ
>
> On Fri, 7 Sep 2018 at 11:38, VIGILANT Luis FernĂĄndez
> <luis@vigilant.es <mailto:luis@vigilant.es>> wrote:
>
> Hi LF EbNauters
>
> I have been building a disciplined Rx for LF, based in
> a GPS LO at 120KHz and a NE602 downconverter to 17KHz
>
> Then feeding the signal to the soundcard, also
> disciplined with 1pps from the same GPS
>
> At Tx side a GPS LO at 1374850 Hz divided by 10
> provides 0.1Hz steps at LF. Then an XOR gate is used for
>
> EbNaut modulation from the DTR of a COM port under
> Windows. The PA is just a mosfet driver (mic4452 AT 12v)
>
> Just about 100mW to antenna but good enough to get a
> 20dB S/N in my Rx 7Km away
>
> Stability looks pretty good and also phase modulation
> as seen in SL spectrogram. Also monitoring phase changes
>
> with the SL plot display window. So, yesterday I tried
> an EbNaut transmission with the following setup
>
> Coding: 8K19A
>
> CRC 16
>
> Symbol period: 1s
>
> Characters: 6 Transmission time: 9.3 minutes
>
> Transmitting at minute 00 and 30 every hour
>
> I got the FFT files from SL and converted them to WAV
> files. The configuration file (SR) included the
> corrected sample rate
>
> of the soundcard as well as decimation , FFT length
> and center frequency
>
> Attached is a WAV file starting at 16:22 which should
> contain the transmission started at 16:30 untill about
> 16:40
>
> The rawsym graphic shows a clear peak centered in
> frequency, but I havenât been able to get a decode
> other than â******â
>
> At least the decoder is detecting the carrier but may
> be there is no proper phase modulation or probably
> other failures
>
> What Iâm doing wrong ? Can anybody decode the message
> from the file ?
>
> BTW, I have used a list length of 47274 and also
> 141823, but nill L
>
> 73 de Luis
>
> EA5DOM
>
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Good luck Luis, <br>
<br>
Later, for a QSO mode, i would suggest rather to use 8K19A than 4K19A.
As far as i understand this will have more 'coding gain'.<br>
As soon as it all works, it becomes quite easy.<br>
<br>
In Linux one could even run a script doing all the file preparation and
decoding automatically, as demonstrated by Domenico. You just need to
watch the screen, like in FT8 ;-)<br>
<br>
73, Stefan<br>
<br>
Am 11.09.2018 18:47, schrieb VIGILANT Luis FernĂĄndez:
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">Hi
Markus<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">Noted<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">Very
interesting.
</span><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">So I can reduce the interval between generated files just
changing the âWaterfall scroll intervalâ at a fixed value as 5 minutes
for example<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">I had it configured automatic at 75% overlap, so that was
changing depending on FFT values and then always getting different
interval between files<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Good to see the âlightâ
</span><span
style="font-size: 11pt; font-family: Wingdings; color: rgb(31, 73, 125);"
lang="EN-US">J</span><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Letâs see if Iâm able to get a decode now<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">73 de Luis<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">EA5DOM<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;">De:</span></b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;">
<a class="moz-txt-link-abbreviated" href="mailto:owner-rsgb_lf_group@blacksheep.org">owner-rsgb_lf_group@blacksheep.org</a>
[<a class="moz-txt-link-freetext" href="mailto:owner-rsgb_lf_group@blacksheep.org">mailto:owner-rsgb_lf_group@blacksheep.org</a>]
<b>En nombre de </b>Markus Vester<br>
<b>Enviado el:</b> martes, 11 de septiembre de 2018 18:13<br>
<b>Para:</b> <a class="moz-txt-link-abbreviated" href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><br>
<b>Asunto:</b> Re: LF: The return of EbNaut for Dummies<o:p></o:p></span></p>
<p class="MsoNormal"><o:p>Â </o:p></p>
<div>
<div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
style="font-size: 10pt; font-family: "Arial",sans-serif; color: black;">Yes
Luis that scheme should work.<br>
<br>
The 10 minute interval for file generation is not hardwired but
simply the scroll interval, as chosen in the "options - Spectrum
display settings" menu. Each column in the spectrogram produces one
file. You can set faster scrolling (at the cost of more data written to
the disk), possibly allowing you to decode and answer sooner in a QSO
setting. <br>
<br>
Whether an EbNaut transmission is completely contained in a file also
depends on the time when SpecLab was started up, initiating
the sequence of files. If the transmission duration is shorter than
file duration minus scroll interval (e.g. 38-10 = 28 minutes), there
will be at least one file containing the full transmission. But
the EbNaut decoder will also work well with recordings which have been
truncated at either or both ends, albeit with some loss of sensitivity.<br>
<br>
Best 73,<br>
Markus  <br>
<br>
  <br>
<br>
-----UrsprĂźngliche Mitteilung----- <br>
Von: VIGILANT Luis FernĂĄndez <<a moz-do-not-send="true"
href="mailto:luis@vigilant.es">luis@vigilant.es</a>><br>
An: rsgb_lf_group <<a moz-do-not-send="true"
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a>><br>
Verschickt: Di, 11. Sept 2018 17:54<br>
Betreff: RE: LF: The return of EbNaut for Dummies<o:p></o:p></span></p>
</div>
<div id="AOLMsgPart_2_c6cbb258-1e03-4106-880b-ec3254d3b89e">
<div>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Hi Stefan, Markus, EbNaut</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Thank you for the detailed explanations. Now I really
understand the configuration and how is related to bandwith and length
of the</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">recorded files. There is also a fixed time between files
recorded and it is always 10 minutes. But, files are overlapped, so
there you can</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">record a file to contain longer than 10 minute
transmission</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">So, letâs see which would be a good configuration to
perform a real QSO. Lets say in LF with some S/N and not al VLF levels</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">At the same time can be a good exercise to check if I
finally understood all this stuff ;-)</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Tx at 4K19A/CRC16/1 sec symbol rate would take 9 min and
4 sec to transmit 17 characters messages</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Assume 15 minutes periods. Lets say first (even)
 transmitting at the hour and 30 min pass the hour</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Second (odd) transmits at minute 15 and 45</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Rx at 44100 sample rate, using a 65536 FFT length, and
1536 decimation, file will contain 38 minutes of recorded signal. Looks
more than enough</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">as we are using about 9 minutes transmissions. Then
bandwidth of the recorded files will be âSample rate / decimationâ</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">44100 / 1536 = 28.71 and then divided by two as SLab
generates the file, ending with 14.35Hz. Which is enough bandwith for a
1 sec symbol rate (10/1=10Hz)</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">So, assume both stations had Rx running previously and SL
already producing files every 10 minutes. Files will contain 38 minutes
of recorded signal</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">A file recorded by windows just after transmission end
(lets say) Â 22:10 would contain a record of 38minutes, so starting time
will be really 21:32</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">This file will contain the message transmited by the
station calling in first period (CQ). To decode it we will select a
timeshift from 21:32 to 22:00 = 28 minutes</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">So there will be time enough to decode the message and
then prepare the transmitter to answer in second period, 15 minutes
pass the hour, 22:15</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">answering the CQ of the station calling first</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">The station calling in first period should have to check
for files recorded at about 22:25 to try to decode an answer</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">And then prepare the corresponding transmission for next
even period at  22:30</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Should this timing schem work for QSOs ? Assuming there
is enough S/N to work at this Tx rate of course</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">73 de Luis</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">EA5DOM</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<div>
<div
style="border-style: solid none none; border-color: currentcolor; border-width: 1pt medium medium; padding: 3pt 0cm 0cm;">
<p class="aolmailmsonormal1"><b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;"
lang="EN-US">De:</span></b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;"
lang="EN-US"> owner-<a moz-do-not-send="true"
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a>
[<a moz-do-not-send="true" href="mailto:owner-rsgb_lf_group@blacksheep?">mailto:owner-rsgb_lf_group@blacksheep</a>.</span><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">org]
<b>En nombre de </b>DK7FC<br>
<b>Enviado el:</b> martes, 11 de septiembre de 2018 15:13<br>
<b>Para:</b> <a moz-do-not-send="true"
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><br>
<b>Asunto:</b> Re: LF: The return of EbNaut for Dummies</span><o:p></o:p></p>
</div>
</div>
<p class="aolmailmsonormal1">Â <o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Hi Luis, <br>
<br>
As Markus mentioned...<br>
And see the attachment. In the example i set the sample rate to 44100
Hz. If you have a downconverter with an LO of 120 kHz, and expect a
message on 137 kHz exactly, set the internal frequency shift to a
center frequency of 17 kHz, like shown in the image.<br>
<br>
Also remember that the number of exported FFT bins in the FFT export
register card should be set to the half of the FFT input size shown in
the FFT register card.
<br>
<br>
Keep us informed about the success :-)<br>
<br>
I'm waiting for your first message to receive here. I'm monitoring
permanently, however only in the range 137.5 kHz +- 50 Hz and only
about 30 minutes message length. Other parameters would work too, but i
need to prepare a special SL instance then...<br>
<br>
73, Stefan<br>
<br>
<br>
<br>
Am 11.09.2018 13:40, schrieb VIGILANT Luis FernĂĄndez: </span><o:p></o:p></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Hi Stefan</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Thank you for the detailed explanation. I prefer to
understand the process rather than getting a working .usr</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">So, excuse me again for dumming again  </span><span
style="font-size: 11pt; font-family: Wingdings; color: rgb(31, 73, 125);"
lang="EN-US">J</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">All understood about the length and relation to FFT
windows time (length) in SL. Width was un unknown parameter for me</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">And Iâm afraid the problem is about the width:</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">>></span><span lang="EN-US">
</span><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Choose the FFT width and length to suit your settings.
The width is maybe 10 * 1/(symbol length) or more</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Lets say 1Hz minimum for a 10 sec symbol leght, right ?</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">So, in the FFT configuration window the only way to get
>1Hz(1.3Hz) for âWidth of one FFT-binâ is to reduce decimation to 1</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">and then set FFT length to 32768 to get some âFFT window
time (length)â. But then, the indows time is just 743ms</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">which will not cover the length of the message at all</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Iâm stucked here. Canât get >width with 30 minutes FFT
lenghts. Iâm using 44.100Hz sample rate
</span><span
style="font-size: 11pt; font-family: Wingdings; color: rgb(31, 73, 125);"
lang="EN-US">L</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">The FFT input type is âComplex ith internal frequency
shiftâ. But even using âReal FFT starting at 0Hzâ doesnât improve much</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Decimation at 1536 and FFT length 65535 produces âWidth
of one FFTâ at 438uHz and FFT windows time 38 min. So this time</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">good length but small width</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">What Iâm doing wrong ?</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">73
de Luis</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">EA5DOM</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">Â </span><o:p></o:p></p>
<div>
<div
style="border-style: solid none none; border-color: currentcolor; border-width: 1pt medium medium; padding: 3pt 0cm 0cm;">
<p class="aolmailmsonormal1"><b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">De:</span></b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">
</span><a moz-do-not-send="true"
href="mailto:owner-rsgb_lf_group@blacksheep.org" target="_blank"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;">owner-</span></a><a
moz-do-not-send="true" href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">
[</span><a moz-do-not-send="true"
href="mailto:owner-rsgb_lf_group@blacksheep.org?">mailto:owner-rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">]
<b>En nombre de </b>DK7FC<br>
<b>Enviado el:</b> lunes, 10 de septiembre de 2018 18:57<br>
<b>Para:</b> </span><a moz-do-not-send="true"
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;"><br>
<b>Asunto:</b> Re: LF: The return of EbNaut for Dummies</span><o:p></o:p></p>
</div>
</div>
<p class="aolmailmsonormal1">Â <o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Hi Luis, <br>
<br>
Am 10.09.2018 17:47, schrieb VIGILANT Luis FernĂĄndez: </span><o:p></o:p></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">The fact of getting windows timestamped files which
really start at a</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">different time and no aparent indication of when they end
âŚ.. doesn´t help at all</span><o:p></o:p></p>
</blockquote>
<p class="aolmailmsonormal1" style="margin-bottom: 12pt;"><span
lang="EN-US">Well, the FFT settings must be so that you cover enough
width (in Hz) and length (in seconds). The necessary width depends on
your symbol length. The length is mentioned in the FFT settings
register card (FFT window time). Choose a rectangular window for EbNaut
decodes.<br>
Convert the txt files into wav using Markus tools. Load the wav file in
the EbNaut decoder and press RUN. Then you will see the start time of
the file. The end is start time + length. Simple, isn't it? :-)<br>
<br>
A new txt file is generated in the interval of the scroll time
(Spectrum (1) ) register card. Usually 30 minutes is fine, or even 1
hour on VLF. Then you get a file each 30 minutes. If the FFT length is
longer than 30 minutes. Your FFT length should be 30 minutes longer
than the transmission length, just to avoid an incomplete set of data
in a txt file.</span><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">
<br>
</span><span lang="EN-US"><br>
Choose the FFT width and length to suit your settings. The width is
maybe 10 * 1/(symbol length) or more.<br>
<br>
<br>
</span><o:p></o:p></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Is there any way of âfastâ EbNaut when signals are strong
?</span><o:p></o:p></p>
</blockquote>
<p class="aolmailmsonormal1" style="margin-bottom: 12pt;"><span
lang="EN-US">I think there are no limits, you can run 0.1 second
symbol length. But usually it is used for weak signals and stable paths.<br>
<br>
</span><o:p></o:p></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">I really donât know what to test next.</span><o:p></o:p></p>
</blockquote>
<p class="aolmailmsonormal1" style="margin-bottom: 12pt;"><span
lang="EN-US">Send me your .usr file and the EbNaut settings you want
to try.<br>
<br>
73, Stefan<br>
<br>
<br>
</span><o:p></o:p></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">May be to run ebnaut_tx in test mode, which just changes
the phase every symbol length</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">And then, analyze the recorded file with a different tool
to determine if this phase changes are there ? Can this be easily done ?</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">73 de Luis</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">EA5DOM</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">PS: Congratulations for your amazing test with the guard
rails. And yes, this is much much harder than EME !
</span><span
style="font-size: 11pt; font-family: Wingdings; color: rgb(31, 73, 125);"
lang="EN-US">J</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">Â </span><o:p></o:p></p>
<div>
<div
style="border-style: solid none none; border-color: currentcolor; border-width: 1pt medium medium; padding: 3pt 0cm 0cm;">
<p class="aolmailmsonormal1"><b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">De:</span></b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">
</span><a moz-do-not-send="true"
href="mailto:owner-rsgb_lf_group@blacksheep.org" target="_blank"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;">owner-</span></a><a
moz-do-not-send="true" href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">
[</span><a moz-do-not-send="true"
href="mailto:owner-rsgb_lf_group@blacksheep.org?">mailto:owner-rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;">]
<b>En nombre de </b>DK7FC<br>
<b>Enviado el:</b> viernes, 07 de septiembre de 2018 22:10<br>
<b>Para:</b> </span><a moz-do-not-send="true"
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: windowtext;"><br>
<b>Asunto:</b> Re: LF: EbNaut transmission test in LF</span><o:p></o:p></p>
</div>
</div>
<p class="aolmailmsonormal1">Â <o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Hello Luis, <br>
<br>
Another hint: Try to use 4K19A and a shorter message, like EA5 or so.
Use long symbols, like 10 seconds or longer. Then, timing is less
critical and you may get a decode and can tune to the best Eb/N0 and
find out what the timing offset it. It would guess it is a timing
problem.<br>
<br>
73 Stefan<br>
<br>
Am 07.09.2018 13:36, schrieb VIGILANT Luis FernĂĄndez: </span><o:p></o:p></p>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Hi Domenico</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Sorry, Iâm not transmitting this weekend. Very stormy
weather here, so the wires are down</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">I will notice in the reflector any transmission in
advance. But first want to confirm that all is working ok</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">So that was the goal of yesterday test</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Yes, the XOR is AFTER the 1/10 divider, and working at
the final frequency 137485 Hz</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Your auto-decoder is a great tool. EbNaut is quite tricky
for average use and needs a lot of details to care about</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);"
lang="EN-US">Of course the reward is great when you get decodes with
miserable signal levels.
</span><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">There
is never free lunch ! ;-)</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">73
de Luis</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">EA5DOM</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif; color: rgb(31, 73, 125);">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;">De:</span></b><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;">
</span><a moz-do-not-send="true"
href="mailto:owner-rsgb_lf_group@blacksheep.org" target="_blank"><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;">owner-</span></a><a
moz-do-not-send="true" href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;"> [</span><a
moz-do-not-send="true"
href="mailto:owner-rsgb_lf_group@blacksheep.org?">mailto:owner-rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;">]
<b>En nombre de </b>Domenico IZ7SLZ<br>
<b>Enviado el:</b> viernes, 07 de septiembre de 2018 13:18<br>
<b>Para:</b> </span><a moz-do-not-send="true"
href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><span
style="font-size: 11pt; font-family: "Calibri",sans-serif;"><br>
<b>Asunto:</b> Re: LF: EbNaut transmission test in LF</span><o:p></o:p></p>
<p class="aolmailmsonormal1">Â <o:p></o:p></p>
<div>
<div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Hello Luis,</span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">thanks for
sharing your experiment. My auto-decoderÂ
</span><a moz-do-not-send="true"
href="https://www.qsl.net/iz7slz/" target="_blank">https://www.qsl.net/iz7slz/</a><span
lang="EN-US">Â is already retuned for your transmissions.</span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">BTW QRM is
large here in the morning time (urban location). I will try to catch
your signal later in the night.</span><o:p></o:p></p>
</div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><i><span lang="EN-US">At least the
decoder is detecting the carrier but may be there is no proper phase
modulation or probably other failures</span></i><o:p></o:p></p>
<p class="aolmailmsonormal1"><i><span lang="EN-US">What Iâm
doing wrong ? Can anybody decode the message from the file ?</span></i><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â I also suspect
some issues on modulator circuit. Of course the XOR gate is following
the /10 divider, is it?</span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Good luck.</span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">73 all, </span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Domenico/IZ7SLZ</span><o:p></o:p></p>
</div>
<div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
</div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
</div>
</div>
</div>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">On Fri, 7 Sep
2018 at 11:38, VIGILANT Luis FernĂĄndez <</span><a
moz-do-not-send="true" href="mailto:luis@vigilant.es">luis@vigilant.es</a><span
lang="EN-US">> wrote:</span><o:p></o:p></p>
</div>
<blockquote
style="border-style: none none none solid; border-color: currentcolor currentcolor currentcolor windowtext; border-width: medium medium medium 1pt; margin: 5pt 0cm 5pt 4.8pt; padding: 0cm 0cm 0cm 6pt;">
<div>
<div>
<p class="aolmailmsonormal1"><span lang="EN-US">Hi LF
EbNauters</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">I have been
building a disciplined Rx for LF, based in a GPS LO at 120KHz and a
NE602 downconverter to 17KHz</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Then feeding
the signal to the soundcard, also disciplined with 1pps from the same
GPS</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">At Tx side a
GPS LO at 1374850 Hz divided by 10 provides 0.1Hz steps at LF. Then an
XOR gate is used for</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">EbNaut
modulation from the DTR of a COM port under Windows. The PA is just a
mosfet driver (mic4452 AT 12v)</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Just about
100mW to antenna but good enough to get a 20dB S/N in my Rx 7Km away</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Stability
looks pretty good and also phase modulation as seen in SL spectrogram.
Also monitoring phase changes</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">with the SL
plot display window. So, yesterday I tried an EbNaut transmission with
the following setup</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Coding: 8K19A</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">CRC 16</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Symbol
period: 1s</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Characters:
6Â Â Â Â Â Â Â Â Â Transmission time: 9.3 minutes</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Transmitting
at minute 00 and 30 every hour</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">I got the FFT
files from SL and converted them to WAV files. The configuration file
(SR) included the corrected sample rate</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">of the
soundcard as well as decimation , FFT length and center frequency</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Attached is a
WAV file starting at 16:22 which should contain the transmission
started at 16:30 untill about 16:40</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">The rawsym
graphic shows a clear peak centered in frequency, but I havenât been
able to get a decode other than â******â</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">At least the
decoder is detecting the carrier but may be there is no proper phase
modulation or probably other failures</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">What Iâm
doing wrong ? Can anybody decode the message from the file ?</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">BTW, I have
used a list length of 47274 and also 141823, but nill
</span><span style="font-family: Wingdings;" lang="EN-US">L</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">Â </span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">73 de Luis</span><o:p></o:p></p>
<p class="aolmailmsonormal1"><span lang="EN-US">EA5DOM</span><o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
</blockquote>
</blockquote>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
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