Don Please believe me. I'm not confused. It just needs to be made clear to people who purchase the 13 Khz filter will only see 5 Khz on the display. Someone else asked the original question because HE was confused and I can understand why. I don't recall this to ever be a point of confusion on any other rig. Steve Ellington [email protected] ----- Original Message ----- From: "Don Wilhelm" <[email protected]> To: "Steve Ellington" <[email protected]> Cc: <[email protected]> Sent: Sunday, May 03, 2009 5:03 PM Subject: Re: [Elecraft] Shortwave filters for K3
> Steve, > > Please do not be confused. The DSP *is* at the IF frequency, *and it > does* process AM at the full bandwidth for all modes as required. > > The AM bandwidth *used to be* displayed as the IF bandwidth, but many were > confused because it was double the bandwidth that could be heard - so it > was changed to *display* the audio bandwidth. > It is a matter of display only, and not the actual operating IF width. > > The display of the audio bandwidth in AM is consistent with the bandwidth > displayed for other modes - the audio bandwidth is what is displayed. (FM > might be different, I don't have the FM filter to try). In any case, now > the DSP displayed bandwidth is equal to the audio bandwidth, no matter > what the actual IF processing width may be. > > 73, > Don W3FPR > > Steve Ellington wrote: >> Don >> I understand the demodulation theory just fine but the concept of having >> the DSP act as an audio filter instead of an IF filter causes some >> confusion since we've been hyping up "IF-DSP" filtering for several years >> now and suddenly we talk about AF-DSP in only one mode, AM. >> Maybe if the BW display showed 10 Khz instead of 5 Khz it would limit the >> confusion since that seems to be what most of us are used to. We >> understand that we only hear one of the two sidebands anyway. Oh well,,, >> I guess the question will keep coming up. >> Steve Ellington >> [email protected] >> ______________________________________________________________ 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
