Sorry, I don't buy the theory that the low-level stopband artifacts are responsible for the perception of the K3 being "noisy". To my ears and tests I've conducted multiple times, the artifacts are audibly masked in listening, even without the LPF.
On spectrum analysis, I see artifacts in descending order at 12Khz, 18Khz and 14.1Khz. To make the strongest of these (12Khz) just barely audible, I have to apply a full 20dB of boost (via narrow parametric EQ filtering). Perhaps it can be argued that the artifacts are responsible for a subtle sense of listener fatigue (I'm skeptical), but not the "noisiness" discussed ad nauseum on the reflector. I am convinced that "noisiness" is due to improper gain adjustment. 73, Barry N1EU Julian, G4ILO wrote: > > But these "artifacts", at least in my observation, are only present when a > signal is present. If they are there when only noise is being received, > they are below the extremely low out of band noise level. Therefore, > whilst I can see that they could contribute to unpleasant or tiring > sounding audio for those blessed with acute hearing, I can't see that they > would result in the receiver sounding noisy. > -- View this message in context: http://n2.nabble.com/RX-Test-long-tp4275854p4277245.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
