I did some more careful checking this morning, transmitting a few watts on the FT-1000MP and using a couple of inches of wire as an antenna on the KX3, on a quiet 10 meter band. The S-meter on the KX3 was 9+ There is noticeable opposite (lower frequency) side suppression issues, but this cuts off at about 900 Hz On the higher side, I can hear signal to as far as my hearing and/or the audio chain permit. The most interesting note was that the undesired signal (high side only) takes a sharp dip or disappears every 50Hz, at .00 or .05 on the frequency readout. I'm not sure what to make of all this, but FWIW . . . 73 - Jim K8MR In a message dated 10/8/2012 3:29:37 P.M. Eastern Daylight Time, dro...@necg.de writes:
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: <jimk...@aol.com> To: <elecraft@mailman.qth.net> 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:Elecraft@mailman.qth.net > > 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: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
