Return-Path: Received: from mtain-mj01.r1000.mx.aol.com (mtain-mj01.r1000.mail.aol.com [172.21.164.85]) by air-md09.mail.aol.com (v129.4) with ESMTP id MAILINMD093-8b964ce943e63d6; Sun, 21 Nov 2010 11:08:06 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mj01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 99BB9380000BE; Sun, 21 Nov 2010 11:08:02 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PKCR0-0001Nh-By for rs_out_1@blacksheep.org; Sun, 21 Nov 2010 16:06:34 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PKCQz-0001NY-Q4 for rsgb_lf_group@blacksheep.org; Sun, 21 Nov 2010 16:06:33 +0000 Received: from mail-iw0-f171.google.com ([209.85.214.171]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PKCQx-0006pL-DW for rsgb_lf_group@blacksheep.org; Sun, 21 Nov 2010 16:06:33 +0000 Received: by iwn42 with SMTP id 42so5716261iwn.16 for ; Sun, 21 Nov 2010 08:06:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=WcX84o5LSMSt29IpIRvvKofv4noHwaKDF1gQZtzPfcg=; b=xGyF++LXYg0wYFzdGX+5XGvg7j3FF1Q/kENWzXHFslFjov9XneZboWMJDBiycGqPG8 oWq3PxdsYrxpPhCd9GfsKr0qJXdJK95PlSzL80kRV/uV1Dj+XVx8aQcwAvd4fim0JL9y V+xT0fTsvss+Z9c8bvUx2dCn0fiEjdyclsHUA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=BPop2Wx3Xo7ji54c5EnHNqvmBEmnt4XnHHzKAdiS4PG77bSuzTkzGvCo6ynOqDLJXX 2BmzKoex4g3zHg8V9MNHJMKOZMJB6SHTwiT7Lj084YocR9bNpoEyJFIDSJRVhetvoY2l zsM33bvbFHnyU7L9K84dpMR65gKNk1oF0pbZ4= MIME-Version: 1.0 Received: by 10.231.144.70 with SMTP id y6mr5487345ibu.99.1290355588897; Sun, 21 Nov 2010 08:06:28 -0800 (PST) Received: by 10.231.11.135 with HTTP; Sun, 21 Nov 2010 08:06:28 -0800 (PST) In-Reply-To: References: Date: Sun, 21 Nov 2010 16:06:28 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) 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=0016e64c2a1a829e420495925290 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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-AUTHENTICATION: mail_rly_antispam_dkim-d299.1 ; domain : googlemail.com DKIM : pass x-aol-sid: 3039400c89a24ce943e26916 X-AOL-IP: 195.171.43.25 X-Mailer: Unknown (No Version) --0016e64c2a1a829e420495925290 Content-Type: text/plain; charset=ISO-8859-1 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 allows. So FSK modes like WSPR and JTxx are a doddle. Narrow band modes that need amplitude variation are possible if the sampling rate (DDS reprogramming) is a lot higher than the signal bandwidth - this is necessary to keep the alias products to a minimum as subsequent 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 diecast box, frequency controlled via RS232 interface. And for narrow modes, you don't even need I/Q outputs from the software. A pair of opamp all-pass filters will generate quadrature drive for 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 him > using it , but never seen anything since ? > > Surely it must be 'simple' to drive a DDS to make a low power > exciter .... hopefully it will replace the 3 ft ( 1 mtr) cube of > racal equipment I need to use on mf in the near future > > 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.. > > *From:* Andy Talbot > *Sent:* Sunday, November 21, 2010 1:41 PM > *To:* rsgb_lf_group@blacksheep.org > *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 > . > 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/LFUpconv.pdf > perfectly, without any need for narrowband analogue phase shift networks > > 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' > > There are plenty of receiver packages for Softrock. clones and similar - > now how about more SDR transmitter software. > > Andy > www.g4jnt.com > > > --0016e64c2a1a829e420495925290 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Not sure=A0which G3PLX product you're referring to...
=A0
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 chi= p allows.=A0 So FSK modes like WSPR and JTxx are a doddle.=A0
=A0
Narrow band modes that need amplitude variation are possible if the= sampling rate (DDS reprogramming) is=A0a lot=A0higher than the signal ban= dwidth - this is necessary to keep the alias products to a minimum as subs= equent anti-alias filtering is impossible if you are generating the wavefo= rm this way.=A0=A0 PSK31=A0formed by reprogramming an AD9852 DDS at 7812.5= Hz (250 samples per symbol)=A0gives < -60dB spurious.=A0=A0 The next 5M= Hz GB3RAL when it comes on line will use this technique.
=A0
A DDS followed by an I/Q upconverter is also straightforward.=A0=A0= I've built an AD9851, IQ upconverter and allpass network into a small= diecast box, frequency controlled via RS232 interface.
=A0
And for narrow modes, you don't even need I/Q outputs from the so= ftware.=A0 A pair of opamp all-pass filters will=A0generate quadrature dri= ve for a single tone input, and can be adjusted=A0to give a=A0couple of 10= 0Hz bandwidth with 40 - 50dB sideband rejection.=A0=A0=A0=A0 All the desig= n data / circuits can be found on my website
On 21 November 2010 15:47, Graham <g8fzk@g8fzk.fsnet.co.u= k> wrote:
=A0
>>> There are plenty of receiver packages for Softrock. clon= es =A0and similar - now how about more SDR transmitter software.<<&l= t;<
=A0
What=A0 happened to the=A0 G3PLX=A0 project=A0 , I had a=A0 ssb=A0 qs= o=A0 with=A0 him using=A0 it=A0 , but=A0 never seen=A0 anything=A0 since= ?
=A0
Surely=A0 it=A0 must be=A0 'simple'=A0=A0 to=A0 drive a DDS= =A0 to=A0 make a=A0 low=A0 power=A0 exciter ....=A0 hopefully=A0 it will= =A0 replace the=A0 3 ft=A0 ( 1 mtr)=A0 cube=A0 of racal=A0 equipment=A0 I= need=A0 to=A0 use on=A0 mf=A0 in the=A0 near=A0 future
=A0
Its=A0 just=A0 occurred=A0 to=A0 me , if I/Q=A0 is=A0 now=A0 coded,= then the=A0=A0 ROS - VLF=A0 , based on=A0 25 Hz=A0 max shift @ =A08 KHz= =A0 =A0 may be opened up to=A0 other bands ?
=A0
G..

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

At last !!!!!!!!
=A0
The first software author to provide=A0datamode stereo I/Q outputs to= drive a direct image cancelling upconverter
.=A0=A0
The latest version of the ROS software, Ver 5.9.8 beta, drives all my= direct upconverters (LF - HF=A0and SHF)
perfectly,=A0 without any=A0need for narrowband analogue phase shift= networks
=A0
Congratulations to Jose for listening and responding to=A0this reques= t.
=A0
The only other software I know of to provide the I/Q output option is= G3PLX's SDR transmitter for SSB/FM/AM voice=A0 http://www.g4jnt.com/SDRTxSW.htm<= /a>=A0 and one or two other 'specials'
=A0
There are plenty of receiver packages for Softrock. clones =A0and sim= ilar - now how about more SDR transmitter software.



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