Return-Path: Received: from mtain-mb11.r1000.mx.aol.com (mtain-mb11.r1000.mx.aol.com [172.29.96.31]) by air-da10.mail.aol.com (v129.4) with ESMTP id MAILINDA103-86424ccef3e1333; Mon, 01 Nov 2010 13:07:46 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 067AF38002AC9; Mon, 1 Nov 2010 13:07:43 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PCxpQ-0001CL-8K for rs_out_1@blacksheep.org; Mon, 01 Nov 2010 17:05:52 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PCxpP-0001CC-M7 for rsgb_lf_group@blacksheep.org; Mon, 01 Nov 2010 17:05:51 +0000 Received: from smtp6.freeserve.com ([193.252.22.190]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PCxpN-0006C2-Dx for rsgb_lf_group@blacksheep.org; Mon, 01 Nov 2010 17:05:51 +0000 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3629.me.freeserve.com (SMTP Server) with ESMTP id A86EF7000083 for ; Mon, 1 Nov 2010 18:05:43 +0100 (CET) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3629.me.freeserve.com (SMTP Server) with ESMTP id 9C20B700008A for ; Mon, 1 Nov 2010 18:05:43 +0100 (CET) Received: from AGB (unknown [91.109.43.143]) by mwinf3629.me.freeserve.com (SMTP Server) with SMTP id D97777000083 for ; Mon, 1 Nov 2010 18:05:40 +0100 (CET) X-ME-UUID: 20101101170540890.D97777000083@mwinf3629.me.freeserve.com Message-ID: <7650C79D087448FC8FB73B75F632162D@AGB> From: "Graham" To: Date: Mon, 1 Nov 2010 17:05:40 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 X-Antivirus: avast! (VPS 101101-0, 01/11/2010), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: ROS VLF 0.8 and 0.4 Baud Content-Type: multipart/alternative; boundary="----=_NextPart_000_0066_01CB79E7.02BE18D0" 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: 3039ac1d601f4ccef3df0e60 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_0066_01CB79E7.02BE18D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ROS VLF 0.8 and 0.4 Baud =20 Outline=20 =20 Based on the ROS MF- 1 and MF-7 narrow band data modes , ROS= VLF is a free running live key board qso mode , not requiring= internet connection or accurate time or frequency control , AFC= of 78 Hz is provided for receive and once locked , the overal= l circuit stability must exceed 5 Hz during the tx period. =20 Configured for operation within the 8 KHz experimental band , usi= ng phase continuous multi tone frequency shift keying , with in= a bandwidth of 25 Hz , allowing for a system Q of over 300 wit= h out degradation and may be transmitted using non linear ampli= fiers. =20 Provision is made for the drive frequency division, inherent in so= me Class E/D amplifiers, by the ability to select 'normal or '= Class E/D' , this selection causes the transmit tones and modul= ation bandwidth to be multiplied by a factor of -2- to 16K / 50H= z , thus after amplification , the signal is reverted to 8k / 25= Hz=20 =20 Rx frequency is fixed and not affected by the Tx select function=20 =20 All normal functions are retained, including the ROS-Chat , allowi= ng text messages to be broadcast to 'all' or individual ROS us= ers, via the internet . The Beacon timer cpu and Rx monitor's have be= en disabled to facilitate tx only operation. If connected to the www= , reception reports will be uploaded to :- =20 http://pskreporter.info/pskmap.html =20 As in MF , spots will show as band 'unknown'=20 =20 The system utilises the soundcard to produce in effect a SDR ra= dio operating at 8KHz . it is estimated that the 0.4 baud versi= on will give a noise floor of some -38 dB , the 0.4 baud versi= on , produces a higher CPU load than 0.8 , showing round 20% on= a dual core lap-top=20 =20 Data summery=20 =20 Frequency tx/rx 8950-8975 Hz =20 Bandwidth 25 Hz=20 Baud rate fixed 0.4 / 0.8 Rx AFC range 78 Hz=20 Drift tolerance 5 Hz=20 S/N 0.4 Baud -38 dB=20 Two exe files are available , one 0.4 band , the other 0.8= baud. for testing =20 73 - G ..=20 ------=_NextPart_000_0066_01CB79E7.02BE18D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

ROS<= /SPAN> VLF &= nbsp;  0.8=  =20 and  0.4=20 Baud

 

Outline=20

 

= Based  on the  ROS MF-= 1  and MF-7   narrow  band  = modes , ROS VLF is a free  running&nb= sp;  live  key  board qso  mode , not  requiring internet  connection  or = =20 accurate  time or=   frequency control ,= =20 AFC of  78 Hz    = is  provided  for  receive and once locked , the  overall  circuit stability  must  exceed   5 Hz du= ring the  tx=20 period.

 

= Configured=20 for  operation  within the  8 KHz  experimental = band , using  = phase  continuous  multi  tone=   frequency shift = ; keying , with in a = bandwidth  of<= SPAN style=3D"mso-spacerun: yes"> =20 25 Hz , allowing  for  a system Q of ov= er  300  with out degradation and may  be =20 transmitted  usin= g  non   linear  amplifiers.

 

= Provision is=20 made for the  drive  frequency  division, inherent  in some  Class E/D &nbs= p;amplifiers,  = by the  ability to  select  =91normal or =91 Class E/D=92 , this  selection  causes  the = transmit  tone= s and  modulation band= width to  be =20 multiplied by a  = factor  of =20 -2- to  16K / 50H= z  , thus after  amplification , the  signal  is reverted to  8k / 25 Hz

 

= Rx frequency is=20 fixed and not affected by the Tx select function

 

= All  normal  functions are  retained, including the  ROS-Chat ,= allowing  text  messages to  be =20 broadcast to  =91= all=92  or =20 individual ROS  users, via the=   internet . The Beacon timer cpu and Rx=20 monitor=92s have been disabled to facilitate tx only operation.  If connected to the  www, reception  reports will  be uploaded to  :-

 

= http://pskreporter.info/pskmap.html

 

= As in MF , spots=20 will  show as   band =91unknown=92

 

= The  system  utilises the   soundcard to  produce in effect a  SDR&nb= sp; radio  operat= ing at   8= KHz . it is  estimated= that  the  0.4 baud  version&= nbsp; will  giv= e a  noise  floor  of =20 some -38 dB , the  0.4  baud version ,<= SPAN style=3D"mso-spacerun: yes">  produces  a  CPU load= than  0.8 , showing=  round  20% on a  dual = ; core  lap-top=

 

Data  summery

 

= Frequency  tx/rx      &nbs= p;   =20 8950-8975  Hz  &nb= sp;        =20

= Bandwidth     &= nbsp;           = ;  =20 25 Hz

= Baud rate    &n= bsp;           =     =20 fixed  0.4   /  0.8

= Rx=20 AFC range &= nbsp;           = ;=20 78 Hz

= Drift=20 tolerance    &n= bsp;         =20 5 Hz

= S/N  0.4  Baud          &nbs= p; =20 -38 dB

 

=  

= Two  exe  files  are = ; available  , one =20 0.4  band  , the  other  0.8  baud. for = =20 testing 

=  

= 73 - G ..

=  

=  



------=_NextPart_000_0066_01CB79E7.02BE18D0--