Return-Path: Received: from mtain-de12.r1000.mx.aol.com (mtain-de12.r1000.mx.aol.com [172.29.64.212]) by air-da02.mail.aol.com (v129.4) with ESMTP id MAILINDA022-86124ce947de3; Sun, 21 Nov 2010 11:25:02 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-de12.r1000.mx.aol.com (Internet Inbound) with ESMTP id B41EE380000B2; Sun, 21 Nov 2010 11:25:00 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PKChT-0001W2-Ny for rs_out_1@blacksheep.org; Sun, 21 Nov 2010 16:23:35 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PKChT-0001Vt-4b for rsgb_lf_group@blacksheep.org; Sun, 21 Nov 2010 16:23:35 +0000 Received: from smtp7.freeserve.com ([80.12.242.2] helo=smtp6.freeserve.com) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PKChQ-0006wh-QB for rsgb_lf_group@blacksheep.org; Sun, 21 Nov 2010 16:23:35 +0000 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3j09.me.freeserve.com (SMTP Server) with ESMTP id 6A61B300008B for ; Sun, 21 Nov 2010 17:23:27 +0100 (CET) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3j09.me.freeserve.com (SMTP Server) with ESMTP id 5D31430000BA for ; Sun, 21 Nov 2010 17:23:27 +0100 (CET) Received: from AGB (unknown [91.109.8.79]) by mwinf3j09.me.freeserve.com (SMTP Server) with SMTP id 11541300008B for ; Sun, 21 Nov 2010 17:23:27 +0100 (CET) X-ME-UUID: 20101121162327711.11541300008B@mwinf3j09.me.freeserve.com Message-ID: From: "Graham" To: References: In-Reply-To: Date: Sun, 21 Nov 2010 16:23:26 -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 101121-0, 21/11/2010), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: ROS Latest with I/Q output Content-Type: multipart/alternative; boundary="----=_NextPart_000_00E2_01CB8998.6CE348A0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,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: 3039ac1d40d44ce947dc29fe X-AOL-IP: 195.171.43.25 ------=_NextPart_000_00E2_01CB8998.6CE348A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Not sure which G3PLX product you're referring to... There is/was article in rad come covering I think a dds tx/rx= , may of been only tx , but the project seemed to stall at= the end , it was a HF all mode tx using software defined techni= ques .. as i say g3plx was air testing on 80 quite a while ago= , but nothing came of it ..pity G.. From: Andy Talbot=20 Sent: Sunday, November 21, 2010 4:06 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: ROS Latest with I/Q output Not sure which G3PLX product you're referring to... It is simple to do a DDS exciter, but you can only 'modulate' a DDS by= reprogramming it in freq/phase /amplitude tio teh extent the chip all= ows. So FSK modes like WSPR and JTxx are a doddle. =20 Narrow band modes that need amplitude variation are possible if the sa= mpling rate (DDS reprogramming) is a lot higher than the signal bandwi= dth - this is necessary to keep the alias products to a minimum as sub= sequent anti-alias filtering is impossible if you are generating the= waveform this way. PSK31 formed by reprogramming an AD9852 DDS at= 7812.5Hz (250 samples per symbol) gives < -60dB spurious. The next= 5MHz GB3RAL when it comes on line will use this technique. A DDS followed by an I/Q upconverter is also straightforward. I've= built an AD9851, IQ upconverter and allpass network into a small diec= ast box, frequency controlled via RS232 interface. And for narrow modes, you don't even need I/Q outputs from the softwar= e. A pair of opamp all-pass filters will generate quadrature drive fo= r a single tone input, and can be adjusted to give a couple of 100Hz= bandwidth with 40 - 50dB sideband rejection. All the design data= / circuits can be found on my website Andy www.g4jnt.com On 21 November 2010 15:47, Graham wrote: >>> There are plenty of receiver packages for Softrock. clones and= similar - now how about more SDR transmitter software.<<<< What happened to the G3PLX project , I had a ssb qso with hi= m using it , but never seen anything since ? Surely it must be 'simple' to drive a DDS to make a low po= wer exciter .... hopefully it will replace the 3 ft ( 1 mtr) cu= be of racal equipment I need to use on mf in the near future= =20 Its just occurred to me , if I/Q is now coded, then the ROS= - VLF , based on 25 Hz max shift @ 8 KHz may be opened up to= other bands ? G..=20 From: Andy Talbot=20 Sent: Sunday, November 21, 2010 1:41 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: ROS Latest with I/Q output At last !!!!!!!! The first software author to provide datamode stereo I/Q outputs to= drive a direct image cancelling upconverter . =20 The latest version of the ROS software, Ver 5.9.8 beta, drives all= my direct upconverters (LF - HF and SHF) http://www.g4jnt.com/IQConverters.htm http://www.g4jnt.com/LFUp= conv.pdf perfectly, without any need for narrowband analogue phase shift net= works Congratulations to Jose for listening and responding to this request= . The only other software I know of to provide the I/Q output option= is G3PLX's SDR transmitter for SSB/FM/AM voice http://www.g4jnt.com/= SDRTxSW.htm and one or two other 'specials'=20 There are plenty of receiver packages for Softrock. clones and simi= lar - now how about more SDR transmitter software. Andy www.g4jnt.com ------=_NextPart_000_00E2_01CB8998.6CE348A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Not sure which G3PLX product you're referring to...
 
There is/was  article  in rad  come =20 covering  I think  a  dds  tx/rx  , may of be= en =20 only   tx , but  the  project  seemed to = ;=20 stall  at the  end , it was a  HF  all  mode= tx=20 using  software  defined techniques .. as i say  g3plx&= nbsp;=20 was  air  testing on 80  quite a  while  ago= ,=20 but  nothing  came  of  it  ..pity
 
G..
 

Sent: Sunday, November 21, 2010 4:06 PM
Subject: Re: LF: ROS Latest with I/Q output

Not sure which G3PLX product you're referring to...
 
It is simple to do a DDS exciter, but you can only 'modulate' a= DDS by=20 reprogramming it in freq/phase /amplitude tio teh extent the chip allo= ws. =20 So FSK modes like WSPR and JTxx are a doddle. 
 
Narrow band modes that need amplitude variation are possible if= the=20 sampling rate (DDS reprogramming) is a lot higher than the= signal=20 bandwidth - this is necessary to keep the alias products to a minimum= as=20 subsequent anti-alias filtering is impossible if you are generating th= e waveform=20 this way.   PSK31 formed by reprogramming an AD9852 DDS= at=20 7812.5Hz (250 samples per symbol) gives < -60dB spurious. = ; =20 The next 5MHz GB3RAL when it comes on line will use this technique.
 
A DDS followed by an I/Q upconverter is also straightforward.&nbs= p; =20 I've built an AD9851, IQ upconverter and allpass network into a small= diecast=20 box, frequency controlled via RS232 interface.
 
And for narrow modes, you don't even need I/Q outputs from the=20 software.  A pair of opamp all-pass filters will generate qu= adrature=20 drive for a single tone input, and can be adjusted to give a = ;couple of=20 100Hz bandwidth with 40 - 50dB sideband rejection.   &n= bsp; All=20 the design data / circuits can be found on my website
On 21 November 2010 15:47, Graham <g8fzk@g8fzk.fs= net.co.uk>=20 wrote:
 
>>> There are plenty of receiver packages for Softrock= . clones=20  and similar - now how about more SDR transmitter=20 software.<<<<
 
What  happened to the  G3PLX  project  , I= had=20 a  ssb  qso  with  him using  it  , bu= t =20 never seen  anything  since ?
 
Surely  it  must be  'simple'   to&nbs= p; drive a=20 DDS  to  make a  low  power  exciter ....&n= bsp;=20 hopefully  it will  replace the  3 ft  ( 1 mtr)&= nbsp;=20 cube  of racal  equipment  I need  to  use= on =20 mf  in the  near  future
 
Its  just  occurred  to  me , if I/Q = is =20 now  coded, then the   ROS - VLF  , based on&nbs= p; 25=20 Hz  max shift @  8 KHz    may be opened up to&nb= sp; other=20 bands ?
 
G..

Sent: Sunday, November 21, 2010 1:41 PM
Subject: LF: ROS Latest with I/Q output

At last !!!!!!!!
 
The first software author to provide datamode stereo I/Q= outputs to=20 drive a direct image cancelling upconverter
.  
The latest version of the ROS software, Ver 5.9.8 beta, drives= all my=20 direct upconverters (LF - HF and SHF)
perfectly,  without any need for narrowband analogue= phase=20 shift networks
 
Congratulations to Jose for listening and responding to th= is=20 request.
 
The only other software I know of to provide the I/Q output opt= ion is=20 G3PLX's SDR transmitter for SSB/FM/AM voice  http://www.g4jnt.co= m/SDRTxSW.htm  and one or two other=20 'specials'
 
There are plenty of receiver packages for Softrock. clones &nbs= p;and=20 similar - now how about more SDR transmitter software.


=



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