there are few if any pairs of 'communications' phones that have significant attenuation above 10Khz yet retain good flat frequency response over the range we are interested in (~ 100Hz to 4KHz )
the artefacts are aliasing products centred around 12Khz, since these are not harmonically related to the fundamental audio the ear is pretty sensitive to them, even though they are at least 60dB lower than the wanted audio. As I have pointed out before, It's subtle, you are not going to hear this at all if you have HF hearing loss, the D to A chip is performing per spec and the K3 prior to this change is already better than a lot of the competition. 73 Brendan EI6IZ On Sun, 2010-01-03 at 03:20 -0800, Julian, G4ILO wrote: > Keith Hamilton-3 wrote: > > > > I would imagine there are a lot of us who hear the "artifacts" but just > > don't > > realize it? This would account for the undefinable "fatigue" some talk > > about. > > > You can see these "artifacts" with a program like Spectran, but they are > only present when modulation is present and they are at a very low level, > probably no worse than the THD of budget consumer audio products. As someone > said to me in an email recently, they probably wouldn't be an issue if > people used communications headphones and speakers with their radios instead > of hi-fi models. > > ----- > Julian, G4ILO. K2 #392 K3 #222. > * G4ILO's Shack - http://www.g4ilo.com > * KComm - http://www.g4ilo.com/kcomm.html > * KTune - http://www.g4ilo.com/ktune.html > -- 73 Brendan EI6IZ ______________________________________________________________ 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
