On Tue, 2008-09-02 at 12:28 -0400, Jack Smith wrote: > > However, setting the LIN OUT at 2 results in quite a bit better odd > order harmonic suppression, on the order of nearly 70 dB.
This might be due to simply running out of usable bits to represent accurately the harmonics at the low end of the K3 internal D to A side of things. > By the time > LIN OUT is set to 5, however, the odd order suppression is reduced to a > bit more than 60 dB. At LIN OUT = 10, it's 45 dB or so where it stays at > all values of LIN OUT tested between 10 and 100. The issue I have with this is that even with a quiet 24Bit semi Pro card but the time you go to Lin = 2 you are some 40dB down on Full scale input on the sound card assuming Consumer line level Leaving aside all other noise sources this only leaves you with 40 to 50dB or so usable dynamic range. On the other hand if you run near flat out your wanted signal (along with the unwanted harmonics ..) are way above soundcard input amp & mixer noise, induced magnetic noise due to the unscreened transformer, Noise picked up internally in the PC etc. This is why I suspect that realworld results will in fact be better at the hotter levels. Visible waterfall ghosts can be resolved by setting your waterfall dynamic range and sensitivity appropriately 73 Brendan EI6IZ -- Don‘t complain. Nobody will understand. Or care. And certainly don‘t try to fix the situation yourself. It‘s dangerous. Leave it to a highly untrained, unqualified, expendable professional. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
