Jim Brown-10 wrote: > > I'm also not convinced that this particular screen shot is non- > linear distortion. It could be aliasing in the FFT software that's > part of the decoder. >
Jim, Just re-read this and got your point. This is interesting as I've observed identical issues. When monitoring a PSK31 signal using a narrow filter I could see a "ghost" signal on the waterfall which was at odd multiples of the base AF. I could also decode the ghost signal implying phase info was intact as was the bandwidth of the signal. This would imply some kind of harmonically related alias - not a simple harmonic. The sound card was way off clipping and line out was set low (can't remember exact setting but it was not greater than 4) and I've used this card (an Edirol FA66) with other radios for PSK using the same software without problems. Not sure if you read my other post but these effects are also audible in the cans (with my good ear!) Paul M1PAF -- View this message in context: http://n2.nabble.com/K3-Audio-tp673868p720566.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] 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
