Return-Path: X-Spam-DCC: paranoid 1102; 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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE,RATWARE_GECKO_BUILD,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 u54FONYZ027920 for ; Sat, 4 Jun 2016 17:24:23 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b9DMe-0000oY-7q for rs_out_1@blacksheep.org; Sat, 04 Jun 2016 16:19:52 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b9DMd-0000oP-MW for rsgb_lf_group@blacksheep.org; Sat, 04 Jun 2016 16:19:51 +0100 Received: from mout3.freenet.de ([2001:748:100:40::2:5]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1b9DMb-0000Ge-Lk for rsgb_lf_group@blacksheep.org; Sat, 04 Jun 2016 16:19:50 +0100 Received: from [195.4.92.140] (helo=mjail0.freenet.de) by mout3.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.85 #1) id 1b9DMa-0004so-BW for rsgb_lf_group@blacksheep.org; Sat, 04 Jun 2016 17:19:48 +0200 Received: from localhost ([::1]:55107 helo=mjail0.freenet.de) by mjail0.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.85 #1) id 1b9DMa-0004AM-5u for rsgb_lf_group@blacksheep.org; Sat, 04 Jun 2016 17:19:48 +0200 Received: from mx17.freenet.de ([195.4.92.27]:59275) by mjail0.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.85 #1) id 1b9DJo-0006Wz-JS for rsgb_lf_group@blacksheep.org; Sat, 04 Jun 2016 17:16:56 +0200 Received: from x4d0865e6.dyn.telefonica.de ([77.8.101.230]:50612 helo=[192.168.178.26]) by mx17.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1.2:DHE-RSA-AES128-SHA:128) (port 587) (Exim 4.85 #1) id 1b9DJo-0003tG-A3 for rsgb_lf_group@blacksheep.org; Sat, 04 Jun 2016 17:16:56 +0200 To: rsgb_lf_group@blacksheep.org References: <5752A817.6080508@gmail.com> <61988954.20160604152234@mterrier.net> <5752E29B.3070708@gmail.com> From: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= Message-ID: <98496960-932d-60b9-dcba-bb9359b8a0f4@freenet.de> Date: Sat, 4 Jun 2016 17:16:55 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 MIME-Version: 1.0 In-Reply-To: <5752E29B.3070708@gmail.com> X-Originated-At: 77.8.101.230!50612 X-Scan-Signature: 55db901127f87fafbf8ae301dac99c44 Subject: Re: LF: EbNaut beaconing on LF from JN80 Content-Type: multipart/alternative; boundary="------------9453E56383A4C264C223687F" 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: 8218 This is a multi-part message in MIME format. --------------9453E56383A4C264C223687F Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Hello Stefan, Michel and all, In fact the 'EbNaut recorder' configuration doesn't use the FFT for decimation. But it uses the same class of pre-processing to decimate the sampling rate for the recorder, by means of I/Q multiplication (with the center frequency of the later decimated band), and a long chain of decimators. Each decimator can divide by either 2 or 3, that's how (and why) we arrive at the strange-looking sampling rate in the saved file. But there is another configuration developed and used by Markus, DF6NM, which indeed uses the complex spectra from SL's FFT for the spectrum analyser, to extract a narrow band of frequencies which are then transformed back into a complex signal for the wave file. Theoretially, the result should be the same in both cases, but I never checked this myself. Cheers, Wolf DL4YHF . Am 04.06.2016 um 16:15 schrieb IZ7SLZ: > Hello Michel, > > The SL recorder function (thanks Wolf !) takes input from FFT and > performs (i think) the inverse-FFT and all necessary calculations > (including any lags) in order to align the audio with the time-stamp. > > The user (me) have just to invoke the command "wave.record" to start > and stop recording. Of course the PC system time must be cured with an > NTP or with a GPS 1pps+nmea. > > SR=111.1187..... comes from the decimation of the actual sample rate > of the audio card (48003.28 mean60). > > In these links you can find four SL configuration pages related to the > recorder, in use in my setup now: > > https://www.dropbox.com/s/j8gefgosqo11jmf/Screenshot%202016-06-04%2013.33.03.png?dl=0 > > https://www.dropbox.com/s/y4w2cwfxssttbz4/Screenshot%202016-06-04%2013.33.51.png?dl=0 > https://www.dropbox.com/s/7rvhhrthk4emha5/Screenshot%202016-06-04%2013.35.34.png?dl=0 > https://www.dropbox.com/s/wvcoey08xfq2xl1/Screenshot%202016-06-04%2014.08.43.png?dl=0 > > All the best > > Domenico, iz7slz > > > On 6/4/2016 3:22 PM, Michel Brunel wrote: >> Re: LF: EbNaut beaconing on LF from JN80 Hello Domenico, >> >> When recording EbNaut samples, do you have to compensate for the lag >> due to the huge decimation factor ? >> >> In other words is it ok or not, to start recording your H:00 >> transmission at H-1:00 and stop recording at H:15 ? >> Another question: how do you achieve the sr=111.118706906 of your WAV >> files ? >> >> Thanks, >> >> Michel - f5wk >> >> >> Le samedi 4 juin 2016 à 12:06:15, IZ7SLZ écrivait : >> >> *> Good day LF, >> >> > I have activated a beacon on 137.485 kHz sending an EbNaut message >> every >> > 30 minutes starting at .00 and .30. >> > Message lenght is 13 characters at 1 s/symbol. Coding = 8K19A >> > Duration is 14'56" >> >> > Carrier is on 1 minute before each transmissions and off at .45 and .15 >> >> > My receiver is also tuned around 137.500 kHz and it is programmed to >> > record EbNaut. >> >> > Recording audio from the receiver, prearranged for EbNaut-rx direct >> > usage, is available at this DropBox folder >> >> *> >> https://www.dropbox.com/sh/9c3nnw40nyb5pqc/AABZ6oPxpAY4IwuWFmebMSfba?dl=0 >> >> *> Each (15 minutes) audio file is named with the date and time of >> its start. >> >> > I will try to keep active the beacon for the week end. >> >> > Report are welcome. >> >> > 73 and good WE all, >> >> > Domenico, iz7slz >> >> >> >> >> >> >> */-- / > --------------9453E56383A4C264C223687F Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Hello Stefan, Michel and all,

In fact the 'EbNaut recorder' configuration doesn't use the FFT for decimation. But it uses the same class of pre-processing to decimate the sampling rate for the recorder, by means of I/Q multiplication (with the center frequency of the later decimated band), and a long chain of decimators. Each decimator can divide by either 2 or 3, that's how (and why) we arrive at the strange-looking sampling rate in the saved file.

But there is another configuration developed and used by Markus, DF6NM, which indeed uses the complex spectra from SL's FFT for the spectrum analyser, to extract a narrow band of frequencies which are then transformed back into a complex signal for the wave file.

Theoretially, the result should be the same in both cases, but I never checked this myself.

Cheers,
   Wolf DL4YHF .

Am 04.06.2016 um 16:15 schrieb IZ7SLZ:
Hello Michel,

The SL recorder function (thanks Wolf !) takes input from FFT and performs (i think) the inverse-FFT and all necessary calculations (including any lags) in order to align the audio with the time-stamp.

The user (me) have just to invoke the command "wave.record" to start and stop recording. Of course the PC system time must be cured with an NTP or with a GPS 1pps+nmea.

SR=111.1187..... comes from the decimation of the actual sample rate of the audio card (48003.28 mean60). 

In these links you can find four SL configuration pages related to the recorder, in use in my setup now:

https://www.dropbox.com/s/j8gefgosqo11jmf/Screenshot%202016-06-04%2013.33.03.png?dl=0
https://www.dropbox.com/s/y4w2cwfxssttbz4/Screenshot%202016-06-04%2013.33.51.png?dl=0
https://www.dropbox.com/s/7rvhhrthk4emha5/Screenshot%202016-06-04%2013.35.34.png?dl=0
https://www.dropbox.com/s/wvcoey08xfq2xl1/Screenshot%202016-06-04%2014.08.43.png?dl=0

All the best

Domenico, iz7slz


On 6/4/2016 3:22 PM, Michel Brunel wrote:
Re: LF: EbNaut beaconing on LF from JN80 Hello Domenico,

When recording EbNaut samples, do you have to compensate for the lag due to the huge decimation factor ?

In other words is it ok or not, to start recording your H:00 transmission  at H-1:00 and stop recording at H:15 ?
Another question: how do you achieve the sr=111.118706906 of your WAV files ?

Thanks,

Michel - f5wk


Le samedi 4 juin 2016 à 12:06:15, IZ7SLZ écrivait :

> Good day LF,

> I have activated a beacon on 137.485 kHz sending an EbNaut message every 
> 30 minutes starting at .00 and .30.
> Message lenght is 13 characters at 1 s/symbol. Coding = 8K19A
> Duration is 14'56"

> Carrier is on 1 minute before each transmissions and off at .45 and .15

> My  receiver is also tuned around 137.500 kHz and it is programmed to 
> record EbNaut.

> Recording audio from the receiver, prearranged for EbNaut-rx direct 
> usage, is available at this DropBox folder

> https://www.dropbox.com/sh/9c3nnw40nyb5pqc/AABZ6oPxpAY4IwuWFmebMSfba?dl=0

> Each (15 minutes) audio file is named with the date and time of its start.

> I will try to keep active the beacon for the week end.

> Report are welcome.

> 73 and good WE all,

> Domenico, iz7slz






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