> Hearing a bit of the opposite sideband is a natural effect of using a > very low Shift/Lo-Cut setting. No matter how straight sided the DSP > filter may be, it does have a finite slope to it (if it did not have > slope, it would ring like crazy).
The DSP effect would be at audio. The "opposite sideband" effect is due to no longer "fixing" the corner of the roofing filter 200 Hz away from the carrier point. Remember, audio frequencies are imaged (folded) around the carrier. The DSP works the same whether audio at 200 Hz is above or below the carrier. 73, ... Joe, W4TV > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm > Sent: Saturday, September 19, 2009 10:30 AM > To: drewko > Cc: Elecraft@mailman.qth.net > Subject: Re: [Elecraft] K3 Audio Response - Version 3.33 Firmware > > > Drew, > > Hearing a bit of the opposite sideband is a natural effect of using a > very low Shift/Lo-Cut setting. No matter how straight sided the DSP > filter may be, it does have a finite slope to it (if it did not have > slope, it would ring like crazy). > > IMHO it is not a problem either - > The cure for that condition is easily available to the operator, just > set the low end a bit higher and the opposite sideband response goes > away. If one really wants to hear those very low > frequencies, he will > have to accept that a bit of opposite sideband will also be heard. > > 73, > Don W3FPR > > drewko wrote: > > It sounds very nice on CW (and AM), even with my cheap headphones, > > which are not particularly bass responsive. It is a very pleasant > > extra dimension when tuning CW bands with wide open filter. > It adds a > > lot to the sound. I wouldn't want to go back to the narrower sound. > > > > You can however hear a good bit more of a signal's opposite > sideband > > when you tune through it with a wide filter and/or Shift set very > > low-- a couple hundred Hz or more on the opposite side for strong > > signals. I don't think that is a problem but some may complain. > > > > > ______________________________________________________________ > 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 ______________________________________________________________ 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
