Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 06B4C38000088; Sat, 26 Nov 2011 12:43:15 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RUMGj-0006SX-Ga for rs_out_1@blacksheep.org; Sat, 26 Nov 2011 17:42:29 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RUMGi-0006SO-Or for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 17:42:28 +0000 Received: from mout9.freenet.de ([195.4.92.99]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RUMGh-0003e0-FC for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 17:42:28 +0000 Received: from [195.4.92.141] (helo=mjail1.freenet.de) by mout9.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.76 #6) id 1RUMGg-0008ER-7P for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 18:42:26 +0100 Received: from localhost ([::1]:53467 helo=mjail1.freenet.de) by mjail1.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.76 #1) id 1RUMGg-0007e3-3l for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 18:42:26 +0100 Received: from [195.4.92.11] (port=37212 helo=1.mx.freenet.de) by mjail1.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.76 #1) id 1RUMEE-0003SP-DD for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 18:39:54 +0100 Received: from blfd-4db0f66e.pool.mediaways.net ([77.176.246.110]:2307 helo=[192.168.178.21]) by 1.mx.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1:CAMELLIA256-SHA:256) (port 465) (Exim 4.76 #1) id 1RUMED-0000Nm-TB for rsgb_lf_group@blacksheep.org; Sat, 26 Nov 2011 18:39:54 +0100 Message-ID: <4ED12467.2020108@freenet.de> Date: Sat, 26 Nov 2011 18:39:51 +0100 From: wolf_dl4yhf User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:8.0) Gecko/20111105 Thunderbird/8.0 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <66E491BAB91C48AF81191F4022525A14@DennisPC> <6FE757960E6C447781689D4F19A315AE@DennisPC> <4EC2C6EB.2080201@iup.uni-heidelberg.de> <4EC2DB14.9000807@talktalk.net> <4ECFD8B6.2050601@iup.uni-heidelberg.de> <4ECFEA18.7080608@broadpark.no> <4ECFEBD3.8020506@iup.uni-heidelberg.de> <4ECFF142.2050902@broadpark.no> <4ECFFB63.6090406@iup.uni-heidelberg.de> <01a701ccabb8$4c255930$e4700b90$@simnet.is> <4ED0CFAE.5010309@broadpark.no> In-Reply-To: <4ED0CFAE.5010309@broadpark.no> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: VLF: 8970 Hz transmissions, soon again here Content-Type: multipart/alternative; boundary="------------000407030701090106000807" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.63 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-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:470874560:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d408d4ed1253334a1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------000407030701090106000807 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Steinar, Maybe I can help with that ... first of all, can you see the DHO38 signal as a 'hump' in the spectrum, center 23.4 kHz, with a few sidebands (caused by the MSK modulation) ? The MSK signal needs a reasonably good SNR to achieve a lock. What the controls of the 'sampling rate detector' should look like is described in the manual, or here: http://www.qsl.net/dl4yhf/speclab/frqcalib.htm#continuous_sr_calib_principle I think Stefan's configuration already contains this (or a very similar) setting. For a quick start, all you need to know is that the 'Status' indicator on the lower edge of the window must turn GREEN after a few seconds (which means the sample rate detector successfully locked the sampling rate to the off-air reference). If it doesn't: Scroll a bit down on that page. There is a screenshot of a 'scope' window. It shows the spectrum of the *squared* MSK signal. In that spectrum, there must be two very distinct peaks (separated exactly 200 Hz, which is the bitrate of DHO). Without those peaks, the decoder won't lock, and you will need to improve the signal/noise ratio from your VLF antenna. Ok ? 73, Wolf DL4YHF . Am 26.11.2011 12:38, schrieb Steinar Aanesland: > > Hi Halldór > > My is grabber is up and running with "DFCW-6000.usr" now, but I am > probably "completely blond" because i can't figure out how to "use > the sample rate detector to lock your sound card to a stable signal" . > I need some help here ;) > > la5vna S > > > > > Den 25.11.2011 22:22, skrev Halldór: >> >> Steinar >> >> When starting my grabber Stefan and Chris thought me some tricks: >> >> "and use the sample rate detector to lock your sound card to a stable >> signal" >> >> That helps if you are using the 60000 window. >> >> 73 >> >> Halldór >> >> TF3HZ >> >> *From:*owner-rsgb_lf_group@blacksheep.org >> [mailto:owner-rsgb_lf_group@blacksheep.org] *On Behalf Of *Stefan Schäfer >> *Sent:* 25. nóvember 2011 20:33 >> *To:* rsgb_lf_group@blacksheep.org >> *Subject:* Re: VLF: 8970 Hz transmissions, soon again here >> >> Steinar, >> >> 600 s/pix. is a good start point for tmw but i would suggest to use a >> even narrower FFT bin width like 424 uHz. Also a well configured >> noise blanker can easily help to get another 6 dB S/N as we have seen >> in the past. >> >> I attach you a "DFCW-6000.usr" which you can load into SpecLab. This >> was used successfully in many last experiments on many grabbers :-) >> >> Not you have to wait some 10 minutes until the first pixel appears so >> do not wonder ;-) >> >> 73, Stefan/DK7FC >> >> Am 25.11.2011 20:49, schrieb Steinar Aanesland: >> >> >> Stefan >> >> I had plans to use 600 sec/step 1mHz res. you will find under >> "quick settings/Slow Morse(..)" in SpecLab, but f you have a better >> solution, I will be happy to try it. >> >> la5vna S >> >> >> >> Den 25.11.2011 20:26, skrev Stefan Schäfer: >> > Thanks Steinar, >> > >> > But it will be a first pre-test, i may not get the maximum strength >> that i want but we'll see. >> > >> > How do you receive 8970 Hz on the software side? Do you have a >> "DFCW-6000.usr" for the SpecLab settings or how did you configure the >> software (which?)? >> > >> > 73, Stefan >> > >> > Am 25.11.2011 20:18, schrieb Steinar Aanesland: >> >> >> >> I will try to capture you Stefan , but I am afraid I got too much >> noise here to get a good result :( >> >> >> >> LA5VNA S >> >> >> >> >> >> >> > --------------000407030701090106000807 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Steinar,

Maybe I can help with that ... first of all, can you see the DHO38 signal as a 'hump' in the spectrum, center 23.4 kHz, with a few sidebands (caused by the MSK modulation) ? The MSK signal needs a reasonably good SNR to achieve a lock.

What the controls of the 'sampling rate detector' should look like is described in the manual, or here:

http://www.qsl.net/dl4yhf/speclab/frqcalib.htm#continuous_sr_calib_principle
I think Stefan's configuration already contains this (or a very similar) setting. For a quick start, all you need to know is that the 'Status' indicator on the lower edge of the window must turn GREEN after a few seconds (which means the sample rate detector successfully locked the sampling rate to the off-air reference). If it doesn't:

Scroll a bit down on that page. There is a screenshot of a 'scope' window. It shows the spectrum of the *squared* MSK signal. In that spectrum, there must be two very distinct peaks (separated exactly 200 Hz, which is the bitrate of DHO). Without those peaks, the decoder won't lock, and you will need to improve the signal/noise ratio from your VLF antenna.

Ok ?

73,
   Wolf  DL4YHF .

Am 26.11.2011 12:38, schrieb Steinar Aanesland:

Hi Halldór

My is grabber is up and running with "DFCW-6000.usr" now, but I am probably "completely blond" because i can't figure out  how to "use the sample rate detector to lock your sound card to a stable signal” .  I need some help here ;)

la5vna S




Den 25.11.2011 22:22, skrev Halldór:

 

Steinar

 

When starting my grabber Stefan and Chris thought me some tricks:

 

“and use the sample rate detector to lock your sound card to a stable signal”

 

That helps if you are using the 60000 window.

 

73

Halldór

TF3HZ

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan Schäfer
Sent: 25. nóvember 2011 20:33
To: rsgb_lf_group@blacksheep.org
Subject: Re: VLF: 8970 Hz transmissions, soon again here

 

Steinar,

600 s/pix. is a good start point for tmw but i would suggest to use a even narrower FFT bin width like 424 uHz. Also a well configured noise blanker can easily help to get another 6 dB S/N as we have seen in the past.

I attach you a "DFCW-6000.usr" which you can load into SpecLab. This was used successfully in many last experiments on many grabbers :-)

Not you have to wait some 10 minutes until the first pixel appears so do not wonder ;-)

73, Stefan/DK7FC

Am 25.11.2011 20:49, schrieb Steinar Aanesland:


Stefan

I had plans to use  600 sec/step 1mHz res. you will find  under "quick settings/Slow Morse(..)" in SpecLab, but f you have a better solution, I will be happy to try it.

la5vna S



Den 25.11.2011 20:26, skrev Stefan Schäfer:
> Thanks Steinar,
>
> But it will be a first pre-test, i may not get the maximum strength that i want but we'll see.
>
> How do you receive 8970 Hz on the software side? Do you have a "DFCW-6000.usr" for the SpecLab settings or how did you configure the software (which?)?
>
> 73, Stefan
>
> Am 25.11.2011 20:18, schrieb Steinar Aanesland:
>>
>> I will try to capture you Stefan , but I am afraid I got too much noise here to get a good result :(
>>
>> LA5VNA S
>>
>>
>>



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