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[195.171.43.25]) by mx.google.com with ESMTP id z5si13279012wjz.6.2013.12.27.12.09.11 for ; Fri, 27 Dec 2013 12:09:12 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1VwdDn-0007Sn-B4 for rs_out_1@blacksheep.org; Fri, 27 Dec 2013 19:37:23 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1VwdDm-0007Se-IE for rsgb_lf_group@blacksheep.org; Fri, 27 Dec 2013 19:37:22 +0000 Received: from smtpout5.wanadoo.co.uk ([80.12.242.80] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1VwdDj-0003fm-Mg for rsgb_lf_group@blacksheep.org; Fri, 27 Dec 2013 19:37:21 +0000 Received: from AGB ([95.145.227.184]) by mwinf5d66 with ME id 6jdH1n0053zLktr03jdHpr; Fri, 27 Dec 2013 20:37:18 +0100 Message-ID: <0567FBE785E64E859C64E1B2FB65B3FA@AGB> From: "Graham" To: References: <20C550A7D07741688C6A26E73CBCF741@White> <52BD619F.3060701@freenet.de> <5203D34278124B23888E0186CD355130@Extensa> <2BD7B5C11C824D999887B3630609DB93@White> <1E9D3911BD544F1090BFCEB45A74BB68@AGB> <305060CA90A44B26ACAE442B939C7722@White> In-Reply-To: <305060CA90A44B26ACAE442B939C7722@White> Date: Fri, 27 Dec 2013 19:37:17 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: There was a change to the top qrg of the band a while back , which is why the mid band was moved , not sure its a while back , who was testing at the time ? , was it the USA that changed ? other than that , the decoder only needs the signal from a sound card inside the pass band to give -50 dB Op -55/6 wspr decode levels G, [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.80 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: b322dc0956bb435e223041a6879534f9 Subject: Re: VLF: Opera frequency range Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C0_01CF033B.0CD82780" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=HTML_50_60,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 Status: O X-Status: X-Keywords: X-UID: 3513 This is a multi-part message in MIME format. ------=_NextPart_000_00C0_01CF033B.0CD82780 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable There was a change to the top qrg of the band a while back , = which is why the mid band was moved , not sure its a while back = , who was testing at the time ? , was it the USA that changed ? = other than that , the decoder only needs the signal from a sound = card inside the pass band to give -50 dB Op -55/6 wspr decode = levels=20 G,=20 From: Markus Vester=20 Sent: Friday, December 27, 2013 6:46 PM To: rsgb_lf_group@blacksheep.org=20 Subject: VLF: Opera frequency range Hi Graham, Peter, VLF, there seems to be conflict in the VLF frequency selection: Somewhat = arbitrarily, EA5HVK hardcoded Opera-VLF to ~ 8910 Hz, while I would = rather stick close to 8970 Hz. Direct Opera-4H audio generation from = Opera software won't work well with the deep search, because=20 - most transmitters and grabbers are currently set up for 8970 Hz, and = we can easily reuse "6000" and "60000" SpecLab instances for opds data = export, - frequency instability from a raw soundcard (ie without continuous = samplerate correction) is typically a ppm or so. This is not really = sufficient to produce a coherent peak in about 60 uHz, - searching a wide frequency range (yes, 22 Hz is vast!) for with uHz = resolution would be unnecessary and inefficient with the SpecLab / opds = combo. If one would like to try decoding 8970 Hz signals with standard Opera = software, one solution would be audio frequency conversion through = SpecLab and VAC. Or we could ask Jos=E9 for a software version with user = definable frequency assignments. =20 Best 73, Markus (DF6NM) From: Graham=20 Sent: Friday, December 27, 2013 5:27 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Opera RX active 24/7 - de PA1SDB The Op decoder limits are 8900 Hz > 8922 Hz=20 mid band 8911 Hz =20 There was a change of band some time back , the Op software is = correct tx/rx soundcard SDR 73-G,=20 From: Markus Vester=20 Sent: Friday, December 27, 2013 2:57 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Opera RX active 24/7 - de PA1SDB Hi Peter, all, Blacksheep seems to be responding again... Hmm, 8.925 kHz would be way out of range of my SpecLab instances. I am = currently looking for Opera signals near 8.97 kHz: opds-32: 8968.5 - 8971.5 Hz (Stefan?) opds-4H: 8969.8 - 8970.2 Hz (Uwe?) Best 73, Markus (DF6NM) VLF grabber running: http://www.df6nm.de/vlf/vlfgrabber.htm From: PA1SDB, Peter=20 Sent: Friday, December 27, 2013 1:57 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: Opera RX active 24/7 - de PA1SDB Hello VLF, Opera RX on 8KC, 24/7 now. Also Spectogram available. The frequency band is 8895 - 8925 Hz, right ? www.qsl.net/pa1sdb ------=_NextPart_000_00C0_01CF033B.0CD82780 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
There  was a  change  to the  top  qrg of=20 the  band a  while  back  , which is why the  = mid=20 band  was  moved  , not  sure  its a  = while =20 back , who  was testing  at the  time ? , was = it=20 the  USA that  changed ?  other than  that , = the =20 decoder only  needs  the  signal from a sound card inside = the  pass  band to  give -50 dB  Op -55/6 wspr  = decode=20 levels
G,

Sent: Friday, December 27, 2013 6:46 PM
Subject: VLF: Opera frequency range

Hi Graham, Peter, VLF,
 
there seems to be conflict in the = VLF=20 frequency selection: Somewhat arbitrarily, EA5HVK hardcoded = Opera-VLF=20 to ~ 8910 Hz, while I would rather stick close to 8970 Hz. Direct Opera-4H audio generation from Opera software won't=20 work well with the deep search, because 
 
- most transmitters and grabbers = are currently=20 set up for 8970 Hz, and we can easily reuse "6000" and "60000"=20 SpecLab instances for opds data export,
- frequency instability from a raw = soundcard (ie=20 without continuous samplerate correction) is typically a ppm or so. This = is not really sufficient to produce a coherent peak=20 in about 60 uHz,
- searching a wide = frequency range=20 (yes, 22 Hz is vast!) for with uHz resolution would = be unnecessary and=20 inefficient with the SpecLab / opds combo.
If one would like to try decoding = 8970 Hz=20 signals with standard Opera software, one solution would = be audio=20 frequency conversion through SpecLab and VAC. Or we could ask = Jos=E9 for=20 a software version with user definable frequency=20 assignments.  
 
Best 73,
Markus (DF6NM)
 
From: Graham
Sent: Friday, December 27, 2013 5:27 PM
Subject: Re: LF: Opera RX active 24/7 - de = PA1SDB

The Op decoder  limits are  8900 Hz > 8922  Hz =
 
mid band  8911 Hz 
 
There  was  a change  of band  some  = time =20 back , the  Op software  is  correct  tx/rx  = soundcard=20 SDR
 
73-G,
 
 

From: Markus Vester
Sent: Friday, December 27, 2013 2:57 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: Opera RX active 24/7 - de = PA1SDB

Hi Peter, all,
 
Blacksheep seems to be responding=20 again...
 
Hmm, 8.925 kHz would = be way out of=20 range of my SpecLab instances. I am currently looking for Opera = signals=20 near 8.97 kHz:
 
 opds-32: 8968.5 - 8971.5 Hz=20 (Stefan?)
 opds-4H: 8969.8 - 8970.2 Hz=20 (Uwe?)
 
Best 73,
Markus (DF6NM)
 
VLF grabber running: = http://www.df6nm.de/vlf/v= lfgrabber.htm
 

From: PA1SDB, Peter
Sent: Friday, December 27, 2013 1:57 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: LF: Opera RX active 24/7 - de = PA1SDB

Hello VLF,
Opera RX on 8KC, 24/7 now.
Also Spectogram available.
 
The frequency band is 8895 - 8925 Hz, =  right=20 ?
 
www.qsl.net/pa1sdb
 
 
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