Hello Dick! An SDR program called Winrad is capable of exactly what you thought. It is a function called "despread" aimed for weak-signal copying (EME and such)
http://www.sdrham.com/winrad/index.html It's freeware working with several SDR receivers but you can also feed K3 audio into it. There's a good audio example of "re-synthesized CW" on this page. 73' Paul PD0PSB PA3CW wrote: > > Hi Geoff, > > Thanks for your reaction. I am very curious whether the modern DSP > technology can discriminate signal from noice (in CW) better than the > human ear and I dont know if it would be boring to just hear a clean tone > whilst the signal is at a minimum level. I think it will be an amazing > thing to experience as you do expect having to put in a lot of effort to > hear the signal through a lot of noise. The second step is if the DSP of > the K3 is able to include such a setting or external 'tracking filter' is > necessary. > > Best, > Dick ... . . .._ > > > > Geoffrey Mackenzie-Kennedy wrote: >> >> Hello Dick, >> >> I am not a DSP expert either, but a tracking filter keying an audio >> oscillator will do exactly what you want. In its simplest form a tracking >> filter is a phase locked loop, and ICs which can be used at audio for >> this >> purpose have been available since the 1960s and are inexpensive. Also a >> tracking filter working at audio can be connected to a receiver's low >> level >> audio output if one is not already in the receiver. I believe that the >> DSP >> wizards have already designed something that does the same job. >> >> Tracking filters are very useful when searching for signals below the >> receiver's noise floor, at VHF for example, but listening to a keyed >> audio >> oscillator without noise can be quite boring. >> >> 73, >> Geoff >> GM4ESD >> >> >> >> ----- Original Message ----- >> From: "PA3CW" <pa...@planet.nl> >> To: <elecraft@mailman.qth.net> >> Sent: Saturday, October 17, 2009 8:57 PM >> Subject: [Elecraft] Clean 600hz signal, full dsp decoupling possible? >> >> >>> >>> Hello forum friends, >>> Not being an expert in the world of DSP, but being an experienced CW >>> operator i often asked myself this question: Why is there no full >>> decoupling between the received signal and the tone in the headset or >>> speaker? In other words is it possible that the dsp discrimiates enough >>> between signal and noise and steers a clean LF oscillator making a clean >>> 600hz or so tone? Is such a setting possible or do i overlook something >>> here? Just a little out of the box thinking... >>> Dick PA3CW >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> > > -- View this message in context: http://n2.nabble.com/Clean-600hz-signal-full-dsp-decoupling-possible-tp3841926p3843746.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
