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 k3uka...@gmail.com 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
Re: [digitalradio] Super narrow filter: PSK31 with HB9DRV SDR-RADIO
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: digitalradio@yahoogroups.com 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 k3uka...@gmail.com 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
Re: [digitalradio] Super narrow filter: PSK31 with HB9DRV SDR-RADIO
Hi Andy, Here is a MixW/TS2000 macro that will center the selected signal and then reduce the TS2000 bandwidth to about 100 cycles (lines beginning with a semicolon are comments and can be removed). ; move RX to 1000 (center of filter bandwidth) ALIGN:1000 ; move TX to same place JUMPTOTXFQ ; turn packet filter bandwidth ON (menu 50A) CATCMD:EX05001001; ; set low DSP filter to narrow CATCMD:SL01; ; set high DSP filter to 170 Hz CATCMD:SH00; Then full RX bandwidth can be restored with this macro. ; set Packet Filter (menu 50A) OFF CATCMD:EX05001000; ; set low cutoff to 100 Hz CATCMD:SL02; ; set high cutoff to 2600 Hz CATCMD:SH06; Having to use the Packet Filter to do this is weird but it was the only way I could find to get the filter down to 100 Hz with CAT. It does cut monster signals down to virtually no interference. Scott/K6IX Andy obrien 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. . 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
[digitalradio] Super narrow filter: PSK31 with HB9DRV SDR-RADIO
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
Re: [digitalradio] Super narrow filter: PSK31 with HB9DRV SDR-RADIO
Andy obrien wrote: 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. Have a go with Winrad or WinradHD as well Andy, you'll find that both those programs allow you to widen and narrow the bandwidth and adjust the filters. The use of click and hold whilst sliding the filter skirts is very useful. Using VAC you can send the audio to DM780 or any other digital mode program that recognises the VAC drivers. Dave (G0DJA)
