Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1513D38000236; Wed, 24 Oct 2012 17:41:50 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TR8Lq-00034H-Up for rs_out_1@blacksheep.org; Wed, 24 Oct 2012 22:18:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TR8Lq-000348-Cb for rsgb_lf_group@blacksheep.org; Wed, 24 Oct 2012 22:18:58 +0100 Received: from smtpout1.wanadoo.co.uk ([80.12.242.29] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TR8Lo-0001aQ-9e for rsgb_lf_group@blacksheep.org; Wed, 24 Oct 2012 22:18:57 +0100 Received: from AGB ([2.26.47.29]) by mwinf5d12 with ME id F9Jt1k00E0dmnFE039JuDK; Wed, 24 Oct 2012 23:18:55 +0200 Message-ID: <4084B089A7FF496CAC1CE9A2459B9C47@AGB> From: "Graham" To: Date: Wed, 24 Oct 2012 22:18:53 +0100 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: 3.2 (+++) 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: Pre release information OPERA OPTICAL BEACON variation Based on the lecture given by Stuart Wisher G8CYW at the RSGB convention , outlining the use of a high frequency audio sub carrier for optical communications , where the light source was modulated with a 17 KHz carrier to enable various modulations to be carrier above the audio 0>3Khz base band, thereby eliminating most of the QRM. [...] Content analysis details: (3.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.29 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message 3.2 MANY_SPAN_IN_TEXT Many tags embedded within text X-Scan-Signature: fd73b8f9df6f2b416d7310bde5bfea2c Subject: LF: OPERA OPTICAL BEACON (way off topic) but is based on 17 KHz :) Content-Type: multipart/alternative; boundary="----=_NextPart_000_0035_01CDB235.8D58CBB0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_70_80,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-sid: 3039ac1d410d5088609e15e1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0035_01CDB235.8D58CBB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Pre release information=20 =20 OPERA OPTICAL BEACON variation=20 =20 Based on the lecture given by Stuart Wisher G8CYW at the RSGB = convention , outlining the use of a high frequency audio sub = carrier for optical communications , where the light source was = modulated with a 17 KHz carrier to enable various modulations to = be carrier above the audio 0>3Khz base band, thereby eliminating = most of the QRM.=20 =20 Following this example , a modified version of the 'Opera beacon' = is in development , with direct audio input / output based in the = 15 to 17 KHz range , with intended OP0.5 and OP2 modes [ 30 = second and 120 second tx cycle time] , OP0.5 has been proven in = scatter tests on vhf and OP2 has similar sensitivity as the wspr = system.=20 =20 The Opera beacon system is a free running one pass decode data = system , with no internet time locking requirement , utilising = On/off keying (ook) of a single carrier , transmitting 256 data = bits. Transmission either by way of a keyed audio output, as per = normal data mode soundcard interface or a simple com-port cw = keyer of an existing 'cw' system , Tx/Rx com-port ptt switching is = also provided. =20 Where as the Tx format remains the same for all , the decoder = has variations linked to the assigned band, propagation and , the = Tx duration is used to set the sensitivity , with versions from = 30 seconds to 4 hours , -20 dB s/n to -50 dB s/n. =20 CAT control and SDR interfaces are provided as part of the = windows based software package , as is a 'PIC Code' , which may = be used to code a stand alone pic controlled beacon, as is a = internet chat facility and spot upload to the psk-reporting web = site , decodes from other users are also directly routed to all = web-linked users , with single band or 'all' band filtering. =20 The latest version may be downloaded from http://rosmodem.wordpress.com/ Notification will be posted when the 15/17Khz modem is embodied=20 ------=_NextPart_000_0035_01CDB235.8D58CBB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Pre release = information=20

 

OPERA OPTICAL    BEACON   variation =

 

Based on =20 the  lecture  given by  Stuart  Wisher  G8CYW  at the  RSGB convention , outlining = the  use of  a =20 high  = frequency  audio sub carrier  for  optical  communications , where  the  light  source  was modulated  with a  17 KHz   carrier  to enable various  modulations  to =20 be  carrier  above the  audio  0>3Khz   base  band, thereby  eliminating  most  of the  QRM. =

 

Following =20 this  example , = a  modified  version  of the  =91Opera  beacon=92  is =20 in development , with =20 direct  audio  input / output  based  in the   15  to 17 KHz range  , with   intended  OP0.5  and =20 OP2   modes  [ 30 second  and  120 second  tx =20 cycle time]  , = OP0.5 has=20 been  proven in scatter =  tests  on vhf  and OP2  has  similar  sensitivity as  the  wspr  system.

 

The =20 Opera  beacon  system is  a =20 free  running  one  pass  decode  data  system , with  no =20 internet time  = locking  requirement , utilising = On/off  keying  (ook) of  a =20 single  carrier ,=20 transmitting   = 256  data  bits. Transmission  either  by way of a  keyed  audio  output, as per normal  data  mode soundcard interface   or  a simple com-port  cw =20 keyer of an  = existing =91cw=92=20 system , Tx/Rx  = com-port  ptt  switching  is also  provided.

 

Where  = as=20 the  Tx  format  remains  the  same  for  all  , the  decoder has  variations  linked to  the assigned band, propagation = and  , the  Tx duration  is =20 used to  set = the  sensitivity  , with  versions  from  30 =20 seconds  to  4 =20 hours  ,  -20 dB s/n to   -50 dB = s/n.

 

CAT  control  and  SDR  interfaces  are  provided  as =20 part of the  = windows  based software  package , as  is =20 a =91PIC = Code=92  , which  may  be =20 used to  code = a  stand  alone  pic controlled  beacon, as  is =20 a internet chat facility and =20 spot upload to the =20 psk-reporting   = web  site ,  decodes  from  other  users  are  also directly routed to = all  web-linked users , with  single band  or =20 =91all=92  = band  filtering.

 

The latest version may be downloaded from http://rosmodem.wordpress.com/

 

Notification  will  be  = posted  when=20 the  15/17Khz  modem  is  embodied=20

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