Testing with a monster signal nearby will be interesting. The ADC in the SDR-IQ digitizes several MHz at a time and then does filtering. The ADC in the sound card digitizes only a few kHz from the TS-2000 audio. You'll see which has better dynamic range.
73, John KD6OZH ----- Original Message ----- From: Phil Williams To: [email protected] Sent: Monday, January 25, 2010 10:50 UTC Subject: Re: [digitalradio] Super narrow filter: PSK31 with HB9DRV SDR-RADIO Impressive. philw de ka1gmn On Sun, Jan 24, 2010 at 11:30 PM, Andy obrien <[email protected]> wrote: Finally! When I bought my TS-2000 a couple of years ago, I was aware of one criticism for the digital operator.... super narrow filtering in SSB was not as easy to achieve as in other rigs.It can be done via a radio equivalent of standing on your head , using CW to receive and USB to transmit. The steps to achieve that are not easy to automate, so I have found it difficult to cope with those monster nearby PSK signals that swamp the waterfall, and could be eased out if I had better filtering in USB. So, tonight, I decided to see how that would be addressed with my new SDR-IQ receiver and Simon Brown's preview release of SDR-Radio . I was very happy to be easily able to dial in narrow filters, til my heart's content. All at the stroke of a mouse slider, couldn't be simpler. Simon's software is still very early in development , so not yet seamlessly integrated with his DM780. Take a look at this screen shot if you are interested, http://www.obriensweb.com/36hz.jpg I highlighted items of interest in a red ellipse. I used Mixw to decode the PSK31 because SDR-Radio does not do it itself. Yes, I know... Mixw displays 20M, but I was actually on 80M. I have yet to try this when there is a monster signal nearby that needs to be nulled out , but I think the results will be good. Andy K3UK
