Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-de01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 4B85138000102; Sat, 17 Sep 2011 16:55:55 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R51uF-00029R-Id for rs_out_1@blacksheep.org; Sat, 17 Sep 2011 21:54:35 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R51uE-00029I-Fx for rsgb_lf_group@blacksheep.org; Sat, 17 Sep 2011 21:54:34 +0100 Received: from imr-da06.mx.aol.com ([205.188.169.203]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R51uB-0002Fc-U1 for rsgb_lf_group@blacksheep.org; Sat, 17 Sep 2011 21:54:34 +0100 Received: from mtaout-db04.r1000.mx.aol.com (mtaout-db04.r1000.mx.aol.com [172.29.51.196]) by imr-da06.mx.aol.com (8.14.1/8.14.1) with ESMTP id p8HKsFG3030966 for ; Sat, 17 Sep 2011 16:54:15 -0400 Received: from White (nrbg-4dbe6e5f.pool.mediaWays.net [77.190.110.95]) by mtaout-db04.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 313F2E0000DD for ; Sat, 17 Sep 2011 16:54:12 -0400 (EDT) Message-ID: <87921B1A33264C65B0A8BBEBBCBD1A04@White> From: "Markus Vester" To: References: <58BF19DEE3D54EB5A3A4F5911BD506FF@White> <002201cc7458$09677160$8d01a8c0@JAYDELL> <000e01cc74ae$20e398e0$6d01a8c0@DELL4> <4E7448CB.6030507@online.fr> <002d01cc7522$a1eccb90$8d01a8c0@JAYDELL> <733EF991BB354216A53A3485493442A3@White> <001301cc7570$e0b8b4d0$8d01a8c0@JAYDELL> Date: Sat, 17 Sep 2011 22:54:11 +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: 0:2:464866880:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: T/A ... and uHz grabber Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01CC758C.B70DADE0" 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: 0:2:487810912:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40c94e75095a0e8d 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_0008_01CC758C.B70DADE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jay, I have only a single spectrogram which covers 137774 to 781 Hz. The = two grabber viewing slots are just two subbands, which Chris and I chose = more or less arbitrarily, and which are sometimes being shifted around. For simplicity, I would suggest that Chris and I simply move the upper = slot down to 137780, and leave the other one around the Russian Loran on = 137775: http://www.alice-dsl.net/df6nm/grabber/TAnarrow.jpg I think this would also work for others, like Scott in VE7. My secret = hope is that someone in VK will catch on, although common darkness for = us may be rather shorter. =20 The catch is that we will still need well separated subbands for = simultaneous east-west and west-east operation. For that reason, I would = suggest 136170 Hz for Eu transmit work. Scott, the slow SpecLab settings are fairly straightforward - I use = 11025 Hz samplerate, complex decimation by 768, FFT size 32768, and 600 = seconds per FFT. The center frequency and display offset will depend on = your receiver's precise LO frequency (watch out for DDS rounding = errors). Finally you will want to inject a known audio tone for = samplerate tracking (eg. GPS-derived 5 kHz), or alternatively 1-pps = pulses plus NMEA (which I haven't tried yet). Best 73, Markus (DF6NM) From: jrusgrove@comcast.net=20 Sent: Saturday, September 17, 2011 9:34 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: T/A ... and uHz grabber Markus Have to admit I didn't pay much attention to your # 2 uHz grabber. One = option would be to use it for uHz bandwidth work. Jay =20 ----- Original Message -----=20 From: Markus Vester=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Saturday, September 17, 2011 7:19 AM Subject: Re: LF: T/A ... and uHz grabber Hi Jay, Chris, LF, first option: To check sensitivity and frequency lock, I like to keep = a Loran line in at least one of the two display slots. In Europe, the = Sylt + Lessay line on 137778.37045 would be my natural choice. Another option would be to simply move down to 137780.00 center. = Integer Hz multiples would allow to build a relatively simple = GPS-synchronized TX, based on a sample-hold at 1pps. Of course this QRG = could then only be used by one station at a time. In case someone overseas would like to set up a narrow grabber, I'd = suggest 136170.00 center for European TA transmissions. Looking into the = other direction, I guess the prospect of sub-millihertz grabbers in the = Far-east or Pacific areas might stimulate quite a bit of activity. Best 73, Markus (DF6NM) From: jrusgrove@comcast.net=20 Sent: Saturday, September 17, 2011 12:14 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: T/A ... and uHz grabber ... Marcus We previously discussed moving the uHz grabber to avoid QRM to QRSS30 = beacon MP (VE3OT) on ~137780.3 - 137780.4. Do you and Chris have a new = frequency in mind? Jay W1VD WD2XNS WE2XGR/2 =20 ------=_NextPart_000_0008_01CC758C.B70DADE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jay, I have only a=20 single spectrogram which covers 137774 to 781 Hz. The two grabber = viewing=20 slots are just two subbands, which Chris and I chose more or = less=20 arbitrarily, and which are sometimes being shifted=20 around.
 
For simplicity, I would suggest that = Chris and=20 I simply move the upper slot down to 137780, and leave the other = one around=20 the Russian Loran on 137775:
http://www.a= lice-dsl.net/df6nm/grabber/TAnarrow.jpg
I think this would also work for = others, like Scott=20 in VE7. My secret hope is that someone in VK will catch on, = although=20 common darkness for us may be rather = shorter.  
 
The catch is that we will still need = well separated=20 subbands for simultaneous east-west and west-east operation. For that = reason, I=20 would suggest 136170 Hz for Eu transmit work.
 
Scott, the slow SpecLab settings = are fairly=20 straightforward - I use 11025 Hz samplerate, complex = decimation by=20 768, FFT size 32768, and 600 seconds per FFT. The center=20 frequency and display offset will depend on your receiver's = precise LO=20 frequency (watch out for DDS rounding errors). = Finally you will want=20 to inject a known audio tone for samplerate tracking=20 (eg. GPS-derived 5 kHz), or alternatively 1-pps pulses = plus NMEA=20 (which I haven't tried yet).
 
Best 73,
Markus (DF6NM)

Sent: Saturday, September 17, 2011 9:34 PM
Subject: Re: LF: T/A ... and uHz grabber

Markus
 
Have to admit I didn't pay much = attention to your #=20 2 uHz grabber. One option would be to use it for uHz bandwidth = work.
 
Jay
 
  
----- Original Message -----
From:=20 Markus=20 Vester
Sent: Saturday, September 17, = 2011 7:19=20 AM
Subject: Re: LF: T/A ... and = uHz=20 grabber

Hi Jay, Chris, LF,
 
first option: To check sensitivity=20 and frequency lock, I like to = keep a Loran=20 line in at least one of the two display slots. In Europe,=20 the Sylt + Lessay line on 137778.37045 would be my = natural=20 choice.
 
Another option would be to = simply move=20 down to 137780.00 center. Integer Hz multiples would allow = to build=20 a relatively simple GPS-synchronized TX, based on a=20 sample-hold at 1pps. Of course this QRG could then only = be used=20 by one station at a time.
 
In case someone overseas would like = to set up=20 a narrow grabber, I'd suggest 136170.00 center for European = TA=20 transmissions. Looking into the other direction, I guess the = prospect of=20 sub-millihertz grabbers in the Far-east or Pacific areas might = stimulate quite=20 a bit of activity.
 
Best = 73,
Markus = (DF6NM)

From: jrusgrove@comcast.net
Sent: Saturday, September 17, 2011 12:14 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: LF: T/A ... and uHz grabber
...
Marcus
 
We previously discussed moving = the uHz=20 grabber to avoid QRM to QRSS30 beacon MP (VE3OT) on ~137780.3 - = 137780.4.=20 Do you and Chris have a new frequency in mind?
 
Jay W1VD  WD2XNS =20 WE2XGR/2    
 
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