Hi Petr, The KXFL3 option operates at baseband (0 to 3 kHz), not 11 kHz. It is actually two filters, one for “I” and the other for “Q” (the quadrature signal paths). Each filter has two LPFs, one for CW, the other for SSB and data. To keep the phase and amplitude balanced, we use capacitors that are hand-trimmed to 0.25% tolerance. The result is an effective roofing filter for the ADCs and DSP.
If the KXFL3 is not installed, the radio uses an 8 kHz IF, like the KX2. 73, Wayne N6KR > On Apr 24, 2018, at 11:23 PM, Petr, OK1RP/M0SIS <indi...@xsmail.com> wrote: > > John, > > just to know, there are no xtal filters in KX3. Just single audio filter at > 11kHz in front of DSP. > > Also check the NR article by Lyle, KK7P here: > http://www.elecraft.com/K3/Lyle%20Johnson%20explains%20Noise%20Reduction.htm > > as same as APF by Wayne, N6KR: > http://elecraft.365791.n2.nabble.com/APF-audio-peaking-filter-on-the-K3-K3S-KX3-td7613416.html > > 73 - Petr, OK1RP > > > > ----- > http://ok1rp.blogspot.com > -- > Sent from: http://elecraft.365791.n2.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 > Message delivered to n...@elecraft.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 Message delivered to arch...@mail-archive.com
