Hi Ed, The IF NB in the K3 is a traditional noise blanker mechanism. It chops the IF during signal peaks. It MUST modulate the other signals in the passband when it is suppressing noise. Physics. I suggest you try all the DSP varieties with the IF set to OFF. They do not have the artifacts that the IF NB does. In general do not use the IF unless it's the only thing that works.
Note that this modulation is quite worse when there is a signal inside the roofing filter bandwidth that is not inside the DSP bandwidth, particularly if you are listening to CW DSP with the SSB roofing filter. No way to get around that without a CW roofing filter. There is something around here that comes on that the DSP NB doesn't quite get. I handle it (whatever it is) with DSP t1-7 and IF NAR 4. But the IF setting still modulates other signals in the passband, because it has to. 73, Guy On Wed, Jul 18, 2012 at 5:28 PM, Ed Stallman <[email protected]> wrote: > I finished K3 Kit 6644 yesterday and noticed today when using the NB > on 6m that it the NB will generate noise only on a few different > levels ! With NB Level on then DSP set to off .. I now turn > IF-NAR from off through the numbers 1 to 7 ...when I get to > IF-NAR 6 and 7 it is much noisier then 2,3,4, or 5 with 4 being > best ! Is this normal ? I was thinking the higher numbers would > reduce more noise ? Using IF-MID and WID 1 has more noise and 7 is less > > Thanks Ed > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
