Am 25.01.2011 15:35, schrieb Ulrich Bangert:
see page 8.6ff of the service manual to see that the HP3325 is not DDS based but uses a "Fractional N Synthesizer scheme" which is something completely different and is not prone to the described effects.
Yes, it's f-N, I must have stored that in the wrong winding of my brain... Fortunately, I had no need to repair my 3325B upto now.
BTW, your effect has been described in detail in the article that Bruce cited on jan7 in the NoStateOfTheArtCounter thread. <http://sdrforum.org/pages/sdr06/sdr06_papers/1.3/1.3-01.pdf > (seems not to work anymore, may be a typo of mine) In the meantime, I have published my sin/cos table on http://opencores.org/project,sincos It should be easy to generate a version with BCD-coded phase input to make a decimal-friendly DDS. _______________________________________________ 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.
