Some AD DDS app notes give examples of spurs and choosing nearby (but not exactly on freq) numbers that are much less bad for spurs - or at least that move the spurs outside the cleanup filters/loops. I don't know of a general example or even code that does this in a general way.
One paper I like on the subject is this: http://ttcla.org/vsreinhardt/DDS%20spur%20reduction%20techniques.pdf P.S. I just like saying "Wheatley Jitter Injector". Not for those who are embarrassed easily... Almost as good as "Wankel Rotary Engine". One of On Sat, Nov 12, 2016 at 8:13 PM, Hal Murray <hmur...@megapathdsl.net> wrote: > > kb...@n1k.org said: > > Yes, the FE-405 uses a DDS and a cleanup. Inside the cleanup loop the DDS > > spurs come straight through. Since the FE-405 compensates for all sorts > of > > things, the DDS moves around a lot. Even a one bit change on a DDS will > move > > spurs around. With an ever changing DDS, you have an ever changing > forest > > of “stuff” on the output. > > Is there a web page or such telling me where the spurs will be on a DDS > for a > particular constant? > > > -- > These are my opinions. I hate spam. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
