Envelope-to: dave@picks.force9.co.uk Delivery-date: Wed, 15 Feb 2006 17:52:39 +0000 Received: by ptb-mxcore01.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1F9QpS-0000DK-21 for dave@picks.force9.co.uk; Wed, 15 Feb 2006 17:52:39 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (PlusNet MXCore v2.00) id 1F9QpR-0000D2-SQ for dave@picks.force9.co.uk; Wed, 15 Feb 2006 17:52:37 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1F9QoE-0003mm-OE for rs_out_1@blacksheep.org; Wed, 15 Feb 2006 17:51:22 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1F9QoE-0003md-BL for rsgb_lf_group@blacksheep.org; Wed, 15 Feb 2006 17:51:22 +0000 Received: from cmsout03.mbox.net ([165.212.64.33]) by relay1.thorcom.net with esmtp (Exim 4.51) id 1F9SD4-00071V-Bb for rsgb_lf_group@blacksheep.org; Wed, 15 Feb 2006 19:21:27 +0000 Received: from cmsout03.mbox.net (cmsout03.mbox.net [165.212.64.33]) by cmsout03.mbox.net (Postfix) with ESMTP id 6052B1EF; Wed, 15 Feb 2006 17:50:24 +0000 (GMT) Received: from cmsapps01.cms.usa.net [165.212.11.136] by cmsout03.mbox.net via smtad (C8.MAIN.3.27I); Wed, 15 Feb 2006 17:50:24 GMT X-USANET-Source: 165.212.11.136 IN dibene@usa.net cmsapps01.cms.usa.net X-USANET-MsgId: XID729kBoRYy1346X03 Received: from [192.168.0.7] [151.46.55.191] by cmsapps01.cms.usa.net (ASMTP/dibene@usa.net) via mtad (C8.MAIN.3.27E) with ESMTP id 755kBoRYw0496M36; Wed, 15 Feb 2006 17:50:22 GMT X-USANET-Auth: 151.46.55.191 AUTH dibene@usa.net [192.168.0.7] Message-ID: <43F369DE.3080405@usa.net> Date: Wed, 15 Feb 2006 18:50:22 +0100 From: Alberto di Bene User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Cc: LWCA LF Reflector References: <021520061715.18320.43F361A7000959930000479022007613940B97010D0A020E06979D0E03@comcast.net> In-Reply-To: <021520061715.18320.43F361A7000959930000479022007613940B97010D0A020E06979D0E03@comcast.net> X-Enigmail-Version: 0.94.0.0 Z-USANET-MsgId: XID755kBoRYX0496X36 Subject: LF: Re: DSP Question I/Q inputs? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit 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-PN-SpamFiltered: by PlusNet MXCore (v2.00) Warren K2ORS/WD2XGJ wrote: > Hello the list, > > A friend of mine is building a hardware converter for his Racal 6830 that will mix the 455kHz i.f. down to 8.44 kHz and provide I/Q outputs. This is so he can pipe the output into Alberto's SDRADIO program and demodulate the wideband modes (AM/FM/SSB) in DSP. > > A question arises would there be any applications at LF? I'm thinking it might be useful for PSK type signals but not sure on this one. > > Alberto, Wolf, any thoughts on this one? > > > -- > 73 Warren K2ORS/WD2XGJ Warren, you can certainly recover the PSK modulated signal using the USB or the LSB mode of SDRadio. But then you need a PSK decoder. One possible solution would be to use VAC (Virtual Audio Cable). VAC implements virtual sound cards, so, e.g. you can tell SDRadio that the output sound card is Virtual Cable Out 1, then you tell to the PSK program of your choice to accept input from the Virtual Cable In 1. Using this technique you can reroute the output of a sound card program to the input of another sound card program without the need of having two separate sound cards in your PC. I have used it and it works. The URL where you can find it is: http://software.muzychenko.net/eng/vac.html It is not free though...a single copy will cost you 30 USD. There is also a demo version, but its purpose is just to evaluate if VAC would work on your setup before shelling the money, as after just a couple of minutes of working, it adds artificial noise to the rerouted audio...clever guy! 73 Alberto I2PHD