As I understand the operation of the phasing noise cancellation units, they have both phase and amplitude adjustments. I'm sure that can be done digitally. How difficult, what issues? Have to leave that to the SDR experts. If not feasible, no harm in asking.
******* BTW I home-built a 144-MHz adjustable polarity control using a variable phase and amplitude control. This is now done in sw by Linrad with two receivers looking at Horz and Vert polarity signals. It is essentially a dual-channel SDR with orthogonal RF inputs. I will be implementing this with a new 144-MHz dual-channel receiving transverter feeding my dual-Rx K3. The dual audio streams will feed a soundcard for the A/D conversion input to Linrad. Linrad has the ability to extract the phase information to display the angle of polarization. 73, Ed At 12:10 PM 11/28/2010, Guy Olinger K2AV wrote: >There is also the issue that the various AGC's may be varying the >amplitude, so the process would have to address both instant >amplitude and phase to affect cancellation. Should be able to >program that, though. How hard to code, who knows??? > >73, Guy. > >On Sun, Nov 28, 2010 at 1:15 PM, Edward R. Cole ><<mailto:[email protected]>[email protected]> wrote: >OK, I realize the Timewave and MFJ noise cancellers operate at RF and >not AF...But I was thinking of the amazing noise reduction that SDR's >accomplish in the digital relm. I understand it may not be that >simple. But sometimes asking the question gets new thinking going. > >For example the second IF of 15-KHz is digitized and run thru FIR >filters; could two separate digitized data streams from the two >receivers be added out of phase digitally? > > >73, Ed - KL7UW, WD2XSH/45 >====================================== >BP40IQ 500 KHz - 10-GHz <http://www.kl7uw.com>www.kl7uw.com >EME: 144-800*w, 432-100w, 1296-testing*, 3400-winter? >DUBUS Magazine USA Rep <mailto:[email protected]>[email protected] >====================================== >*temp not in service >______________________________________________________________ >Elecraft mailing list >Home: ><http://mailman.qth.net/mailman/listinfo/elecraft>http://mailman.qth.net/mailman/listinfo/elecraft >Help: <http://mailman.qth.net/mmfaq.htm>http://mailman.qth.net/mmfaq.htm >Post: mailto:[email protected] > >This list hosted by: <http://www.qsl.net>http://www.qsl.net >Please help support this email list: ><http://www.qsl.net/donate.html>http://www.qsl.net/donate.html > 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-800*w, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep [email protected] ====================================== *temp not in service ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
