Olli, Very interesting. I have experienced this effect recently when operating from 2400 m high summit as TA4/UA9CDC. I thought the reason is opposite side band not well suppressed. Therefore I was going to ask Wayne to send me that beta firmware they have developed in order to rectify the issue. Now I will have to try to see if that VFO NR is the culprit. Here at home I have usually pretty high noise level that simply masks these weak artifact signals. Therefore it is not an issue. But I have purchased KX3 just to go to quiet locations and enjoy operating from there and being able to hear what I miss from the city. Thank you for very interesting info.
73, Igor UA9CDC ----- Original Message ----- From: "Oliver Dröse" <[email protected]> To: <[email protected]>; <[email protected]> Sent: Tuesday, October 09, 2012 12:59 AM Subject: Re: [Elecraft] KX3 Filter Blow-By > Hi Jim, > > did you have VFO NR enabled by chance? I suppose yes, as the KX3 is quite > unusable on the high bands without. :-( There is a known issue = bad > effect > of the DSP leading to "artifacts", i.e. hearing signals +/- 5-6 kHz again > from strong stations. If you turn off VFO NR it goes away, but then the > VFO > noise is much too strong. :-( Another bad effect is even with VFO NR > enabled > if you tune "over" strong stations you suddenly have strong VFO noise > until > you stop turning the wheel. Afterwards it's gone again. And if you turn > the > VFO fast enough you will not even recognize even 59+ signals. :-( All > problems from the VFO NR DSP implementation as confirmed by Elecraft. And > no > matter if with or without roofing filter and with/without 8 kHz shift > enabled. Still wonder why nobody else is complaining about those effects? > Cannot be that everybody has an s4 noise level on 12, 10 & 6 m that would > mask the VFO noise and thus no need to enable VFO NR. > > I documented all those effects on video and sent it over to Wayne. He said > he and Lyle are working on it, hopefully with some results soon, otherwise > the KX3 is of no use for a high band op like me. :-( Never seen such > problems with *any* other rig owned so far ... > > 73, Olli - DH8BQA > > > > ----- Original Message ----- > From: <[email protected]> > To: <[email protected]> > Sent: Monday, October 08, 2012 7:46 PM > Subject: [Elecraft] KX3 Filter Blow-By > > >>A recent KX3 owner (# 1677), I've noticed hearing out of passband signals >> from loud CW stations. I can hear such stations up to several KHz away. >> I >> suspect the range is limited by the audio response of the system, >> including >> my ears. Both sides of zero beat, though less so on the opposite side of >> the zero beat. >> >> In the CA QSO Party this weekend, maybe the loudest 10% of the stations >> on >> 10 CW Saturday afternoon were leaking through. (I've heard the leakage on >> other bands as well.) >> >> I don't have any roofing filters. (I figured any stations weak enough >> for >> me to need the filter to hear, would never be able to hear me anyway). >> >> Is this normal, or is there some shielding or other issue affecting my >> unit? (It is a kit version). >> >> >> 73 - Jim K8MR >> ______________________________________________________________ >> 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 >> >> >> ----- >> E-Mail ist virenfrei. >> Von AVG uberpruft - www.avg.de >> Version: 2012.0.2221 / Virendatenbank: 2441/5317 - Ausgabedatum: >> 08.10.2012 >> > > ______________________________________________________________ > 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
