Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w06JLdqw014540 for ; Sat, 6 Jan 2018 20:21:40 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eXtyp-0004Sm-4K for rs_out_1@blacksheep.org; Sat, 06 Jan 2018 19:18:07 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eXtyo-0004Sa-O2 for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 19:18:06 +0000 Received: from mail-wm0-x22c.google.com ([2a00:1450:400c:c09::22c]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eXtyk-0002YW-6b for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 19:18:05 +0000 Received: by mail-wm0-x22c.google.com with SMTP id n138so7719276wmg.2 for ; Sat, 06 Jan 2018 11:18:01 -0800 (PST) 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=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=12QDLzzZ57u8g6qREN8DmnT1RfOD7RS+/QnIYxqMDbA=; b=W9gfYU7ufwjymmMDM/2pynfctSe4bAxFViq3ZS3acc5nx97XsRNtI35I2ncsTxtnqP MbMnu3UPOpSZ3d7SRGJ2iIphzZJxFdP5VqEcvCkwnvKkzMYa7y2krmSLgDA5IbAXlMis +2gOegmI2oU6bGc7hRQte6nzZ3OBUCj2geINX0qR313NY0jiBuRAJGzHN+FqM60WQh/Z 5C0J4ani+hcql5YoE7sIijv6eNeY+irN0y2qAY4gYCADdUz29a34KznoVmWPMiHvj/WX dupYplezJarYrI16Vi/6SyGeXOmTGbZ6kCxuRvj66PSDzkIF1Q9S/hRkPRlZwZNUYcsg GoiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=12QDLzzZ57u8g6qREN8DmnT1RfOD7RS+/QnIYxqMDbA=; b=QgjALql0TdqgckRS4C9p6TV6f6NgiAGlsHYahgkaxzg4Rxswktbq8dbPedNCXcTmyL kd0LYppCWQx8ZYAhddS/IrfeQtTwQK0pDQLZ49SaUX/2+r8U3FXpcMGlpch9RcjdLoRZ 26CsjDLX1STNjz8NRxZd6sN5lNJbK73ohPUc4XXraQolAm1OnvFCZG+ynO8FcmTi6KKd KLhMAOsWSQepZoF8QGA5BrkbkYN5RWCyN3hX3fPaoVoZEXftRRjpxoJnMQaEBxRzGC8b BOw+6lskBlBmiasO+WjnIpQI+WrHzUJNg131Ff4Lr0GWRcZqWSXvKLXb07FX5CYP+btx kg8g== X-Gm-Message-State: AKGB3mKnjTMgqW7yBklysYswguxlTLVW4TCwGX8IqQxnS5prOpvv55+T 9WVDS8xBwHKyXbLICRe3q8m2kbuT+1kA6Eno7bA= X-Google-Smtp-Source: ACJfBovEPcbD/Y3IS1y0p/mEntAK5OgtR/5Pau71LiwL73R6nsYRCR/grAY7DsaFsXNJl36TiOAgyXPZ3YndWveRwj4= X-Received: by 10.80.177.178 with SMTP id m47mr9585356edd.261.1515266281092; Sat, 06 Jan 2018 11:18:01 -0800 (PST) MIME-Version: 1.0 Received: by 10.80.177.54 with HTTP; Sat, 6 Jan 2018 11:18:00 -0800 (PST) In-Reply-To: References: <4d96a9d4-5f22-7650-872b-6344e9aea8e3@abelian.org> <702563436.93043973.1515019639560.JavaMail.zimbra@shaw.ca> <1117988114.95527491.1515092735528.JavaMail.zimbra@shaw.ca> <1944603203.95803107.1515098735558.JavaMail.zimbra@shaw.ca> <1178238001.101520499.1515262806879.JavaMail.zimbra@shaw.ca> From: Andy Talbot Date: Sat, 6 Jan 2018 19:18:00 +0000 Message-ID: To: LineOne X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Someone, somewhere, must have designed a soundcard, or an A/D that looks to a PC like a soundcard to allow easy integration with much of this analysis software. It really shouldn't be necessary to have to feed 1PPS references into the parallel stereo channel and do complicated software locking. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (andy.g4jnt[at]gmail.com) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 0.0 T_REMOTE_IMAGE Message contains an external image X-Scan-Signature: e5f33499c82e559d1cf2f25253946608 Subject: Re: SL settings for QRSS (was: Re: LF: RE: Todmorden receiver by Jack) Content-Type: multipart/alternative; boundary="f403045c2cb46cbbf40562206cc0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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 --f403045c2cb46cbbf40562206cc0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Someone, somewhere, must have designed a soundcard, or an A/D that looks to a PC like a soundcard to allow easy integration with much of this analysis software. It really shouldn't be necessary to have to feed 1PPS references into the parallel stereo channel and do complicated software locking. I did wonder if a PCM2900 USB soundcard chip could be made to do that, by clocking it with a locked 12MHz input. But someone said it would suffer from USB packet slippage so I never persued the idea. I can transfer perfectly timed I/Q data , albeit from a slower 1kHz sampling rate, over a 115200 baud RS232 link implemented with USB COM ports, and it must be possible to do it faster. In fact, USB RS422 COM ports using the FTDI232 device can be made to ackle at 3MBit/s - I've tested it, it works - so transferring mono 16 bit data could allow 48kHz sampling along with some framing overhead and timing info using off the shelf hardware. Andy G4JNT Virus-free. www.avg.com <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On 6 January 2018 at 18:42, Wolfgang B=C3=BCscher wrote= : > Hello Jack and all, > > you wrote: > > >It comes back to using something like SL with its QRSS > capabilities. I wish I had a good file that worked at 8720kHz > for QRSS600 as an example. This would be a good start if nothing else. > < > > It's not that difficult to set up. The key point in SL to get into the > microhertz-resolution is the decimation (of the sampling rate), along wit= h > complex frequency to have a complex FFT spanning just a few Hz around the > "frequency of interest". The effect is similar as a super-long FFT > (concerning the frequency bin width, and thus the "gain"). I think on > Stefan (DK7FC's) site you can find some configuration files for QRSSS. > > Back in the "old days" of extremely slow Morse, I wrote this short how-to > (for Spectrum Lab): > http://www.qsl.net/dl4yhf/speclab/qrss_quickstart.htm > (it shows how to pick one of the VLF transmitters to stabilize the > soundcard's sampling rate, > a bit out of fashion since good GPSes with sync output became available= , > but anyway..) > > To make the FFT window even longer / frequency bins even shorter than use= d > in the default settings, > use the option 'complex input for the FFT with internal frequency shift', > as shown at > http://www.qsl.net/dl4yhf/speclab/settings.htm#fft_size > > And, last not least, there an explanation of FFT length, decimation, > windowing functions, resulting resolution / effective receiver bandwidth > versus dynamic range, etc: > http://www.qsl.net/dl4yhf/speclab/fftinfo.htm > > All the best, > Wolf DL4YHF > > > > > > > --f403045c2cb46cbbf40562206cc0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Someone, somewhere, must have designed a soundcard, or an = A/D that looks to a PC like a soundcard to allow easy integration with much= of this analysis software.=C2=A0 =C2=A0It really shouldn't be necessar= y to have to feed 1PPS references into the parallel stereo channel and do c= omplicated software locking.

I did wonder if a PCM2900 U= SB soundcard chip could be made to do that, by clocking it with a locked 12= MHz input.=C2=A0 =C2=A0But someone said it would suffer from USB packet sli= ppage so I never persued the idea.=C2=A0=C2=A0

I c= an transfer perfectly timed I/Q data , albeit from a slower 1kHz sampling r= ate, over a 115200 baud RS232 link implemented with USB COM ports, and it m= ust be possible to do it faster.
In fact, USB RS422 COM ports usi= ng the FTDI232 device can be made to ackle at 3MBit/s - I've tested it,= it works -=C2=A0 =C2=A0so transferring mono 16 bit data could allow 48kHz = sampling along with some framing overhead and timing info using off the she= lf hardware.

Andy=C2=A0 G4JNT

= Virus-free. www.avg.com

On 6 January 2018 at 18:42, Wolfgang B=C3=BCscher <dl4yhf@freenet.de&= gt; wrote:
Hello Jack and all,

you wrote:

>It comes back to using something like SL with its QRSS
capabilities. I wish I had a good file that worked at 8720kHz
for QRSS600 as an example. This would be a good start if nothing else.
<

It's not that difficult to set up. The key point in SL to get into the = microhertz-resolution is the decimation (of the sampling rate), along with = complex frequency to have a complex FFT spanning just a few Hz around the &= quot;frequency of interest". The effect is similar as a super-long FFT= (concerning the frequency bin width, and thus the "gain"). I thi= nk on Stefan (DK7FC's) site you can find some configuration files for Q= RSSS.

Back in the "old days" of extremely slow Morse, I wrote this shor= t how-to (for Spectrum Lab):
http://www.qsl.net/dl4yhf/speclab/qrss_qui= ckstart.htm
=C2=A0 (it shows how to pick one of the VLF transmitters to stabilize the s= oundcard's sampling rate,
=C2=A0 a bit out of fashion since good GPSes with sync output became availa= ble, but anyway..)

To make the FFT window even longer / frequency bins even shorter than used = in the default settings,
use the option 'complex input for the FFT with internal frequency shift= ', as shown at
http://www.qsl.net/dl4yhf/speclab/settin= gs.htm#fft_size

And, last not least, there an explanation of FFT length, decimation, window= ing functions, resulting resolution / effective receiver bandwidth versus d= ynamic range, etc:
http://www.qsl.net/dl4yhf/speclab/fftinfo.htm<= br>
All the best,
=C2=A0Wolf DL4YHF







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