Thanks for your explanation, I had missed the point of RLVZ's comment. A related cause and I am speculating here without doing the calculations, when the noise is rough and signals are at or under the noise floor might be the added in-passband low level intermodulation products generated by a narrow bandwidth roofing filter when hit by all of the received noise power, which the DSP then has to cope with, given that the OIP3 of a narrow bandwidth crystal filter is usually "worse" than that of a wider filter - all else being equal. I do have some crystal filter OIP3 vs filter bandwidth measured data which shows this effect, but will stop speculating on the effect on a DSP :-)
I agree with your comment about DSP radios vs full analogue radios. 73, Geoff GM4ESD Tom W8JI wrote: > I think people are talking about two different things here. > > What I am talking about, and what I understand some others to be talking > about, is a problem with DSP systems processing noise floor signal, > especially when the noise is a bit rough, without adding artifacts that > make > copy or quality worse. <snip> > I have no problem at all with how the K3 blanker and noise reduction > works, > and actually IMO it does a good job for me. I just don't think any DSP > radio > is as good as a full analog system when signal levels are near noise > levels, > especially when the noise floor is a bit rough. ______________________________________________________________ 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
