Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6342738000092; Sat, 24 Sep 2011 12:56:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R7VW8-0001GG-4K for rs_out_1@blacksheep.org; Sat, 24 Sep 2011 17:55:56 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R7VW7-0001G7-JC for rsgb_lf_group@blacksheep.org; Sat, 24 Sep 2011 17:55:55 +0100 Received: from imr-db03.mx.aol.com ([205.188.91.97]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R7VW4-0006uc-QK for rsgb_lf_group@blacksheep.org; Sat, 24 Sep 2011 17:55:55 +0100 Received: from mtaout-da01.r1000.mx.aol.com (mtaout-da01.r1000.mx.aol.com [172.29.51.129]) by imr-db03.mx.aol.com (8.14.1/8.14.1) with ESMTP id p8OGto8k014343 for ; Sat, 24 Sep 2011 12:55:50 -0400 Received: from White (nrbg-4dbe6df4.pool.mediaWays.net [77.190.109.244]) by mtaout-da01.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 3934FE000146 for ; Sat, 24 Sep 2011 12:55:49 -0400 (EDT) Message-ID: <976E96347FDF49FEB91588B891BF47AF@White> From: "Markus Vester" To: References: Date: Sat, 24 Sep 2011 18:55:53 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 X-AOL-SCOLL-SCORE: 0:2:440990240:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: DF6NM 23-09-2011 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003D_01CC7AEB.958D4B30" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: 0:2:475557856:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d608b4e7e0bd4353d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_003D_01CC7AEB.958D4B30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Gary, this is excellent, and much appreciated! I had basically tried to = provide a readable signature on Chris' grabbers, but in the end QRSS = 1200 turned out to be a bit fast for those. I guess the general concept = is more suitable for straight unmodulated carriers...=20 Your screenshot reveals my transmit instability near the end of the "N", = when my (DHO-based) samplerate locking temporarily failed, and the audio = frequency jumped by 20 mHz. Do you have plans for further optimization? = The Loran line visible on 137780.419 (Anthorn et al) may come in handy = to evaluate sensitivity and stability during development. One thing I would perhaps suggest is to activate the "one pixel per FFT = bin" option in Speclab. If you don't, and zoom in instead, the = brightness of each pixel is driven by the highest power from a number of = adjacent FFT bins, which in effect increases the visible noise level = significantly. Of course the downside is that the visible range becomes = quite narrow, requiring TX stations to cuddle closely around a = prescribed QRG to be seen on the grabber slot. On the other hand, you = can still move the slot around a posteriori, and manually search for = possible missed activity. Best 73, and thanks Markus (DF6NM) From: Gary - G4WGT=20 Sent: Saturday, September 24, 2011 12:26 PM To: LF Group (RSGB)=20 Subject: LF: DF6NM 23-09-2011 Hi Marcus, LF,=20 Please forgive the frequency accuracy & stability on my experimental = very slow (2 mHz) SpecLab screen but the signal is clearly visible. Receiver - JRC NRD-345 Antenna - PA0RDT Mini-Whip at 9 metres 73 Gary - G4WGT ------=_NextPart_000_003D_01CC7AEB.958D4B30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Gary,
 
this is excellent, and much = appreciated! I had=20 basically tried to provide a readable signature on Chris' grabbers, = but in=20 the end QRSS 1200 turned out to be a bit fast for = those. I guess=20 the general concept is more suitable for straight unmodulated=20 carriers...
 
Your screenshot reveals = my transmit=20 instability near the end of the "N", when my (DHO-based) samplerate = locking=20 temporarily failed, and the audio frequency jumped by 20 = mHz.=20 Do you have plans for further = optimization? The=20 Loran line visible on 137780.419 (Anthorn et al) may come in handy = to=20 evaluate sensitivity and stability during development.
 
One thing I would perhaps = suggest is to=20 activate the "one pixel per FFT bin" option in Speclab. If you don't, = and=20 zoom in instead, the brightness of each pixel is driven by = the highest=20 power from a number of adjacent FFT bins, which in effect increases = the=20 visible noise level significantly. Of course=20 the downside is that the visible range becomes quite narrow, = requiring TX=20 stations to cuddle closely around a prescribed QRG to be seen on = the=20 grabber slot. On the other hand, you can still move the slot around = a=20 posteriori, and manually search for possible missed = activity.
 
Best 73, and thanks
 
Markus (DF6NM)
 

Sent: Saturday, September 24, 2011 12:26 PM
Subject: LF: DF6NM 23-09-2011

Hi Marcus, = LF,=20

Please forgive the frequency accuracy & stability on my = experimental=20 very slow (2 mHz) SpecLab screen but the signal is clearly = visible.

Receiver - JRC NRD-345
Antenna - PA0RDT Mini-Whip at 9 metres

73

Gary - G4WGT

------=_NextPart_000_003D_01CC7AEB.958D4B30--