On Wed, Dec 14, 2011 at 10:52 PM, Hal Murray <[email protected]> wrote: > > [email protected] said: >> The prime factors are 13, 3, 2, 2, 2, and lots more 2s > > There are also a couple of 5s in there. > > [~]$ factor 63897600 > 63897600: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 5 5 13
Not fair. You added two zeros on the end and then got to add two more 2s and 5s. How about this: 63897600000000: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 5 5 5 5 5 5 5 5 13 >> There really is no reason to clock a DDS with a nice even number frequency. >> OK the even freq. makes the math easier but it's all done in software so >> "easier" does not matter. > > I'll bet there are some second order considerations in there. How about > spurs? If your starting frequency is "nice" relative to your target > frequency What is the "target frequency"? If you are building a radio or a signal generator you will tune around all over the band. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
