> Just for comparison, using the DSP demod on my old vintage 96 > MP. It suppresses the opposite sideband perfectly. That is 13 > years old DSP technology and firmware.
You must have an exceptional MP ... my MK V would certainly exhibit "opposite sideband" response in CW if I moved the PBT very low in frequency and then tuned to the other side of the carrier. I can't think of a single radio that had unconditional single signal response if the PBT (or filters) were adjusted so they provided a response on the "image." 73, ... Joe, W4TV > -----Original Message----- > From: Arie Kleingeld PA3A [mailto:p...@xs4all.nl] > Sent: Saturday, September 19, 2009 6:31 PM > To: li...@subich.com > Subject: RE: [Elecraft] K3 Audio Response - Version 3.33 Firmware > > > Joe, > > With DSP demodulation the opposite sideband suppression > should not be a problem. > > Just for comparison, using the DSP demod on my old vintage 96 > MP. It suppresses the opposite sideband perfectly. That is 13 > years old DSP technology and firmware. > > No reason why a K3 could not match that. But it does not. > > > 73 > Arie PA3A > > -----Oorspronkelijk bericht----- > Van: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] Namens Joe Subich, W4TV > Verzonden: zaterdag 19 september 2009 17:06 > Aan: d...@w3fpr.com > CC: Elecraft@mailman.qth.net > Onderwerp: Re: [Elecraft] K3 Audio Response - Version 3.33 Firmware > > > > > > 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 > > ______________________________________________________________ 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
