The hp8656 spectral purity may be a problem. Residual FM for output frequencies above 494MHz is < 15 Hz rms ( 0.3 to 3 kHz BW ). (The B version is better by about a factor of 2) Dave
Perry Sandeen via time-nuts <time-nuts@lists.febo.com> wrote: >Yo Bubba Dudes!, >First, does the internal OCXO run when the power is turned off? >Wrote: >We are presently experimenting using a ISC570B multiplier at 100 MHz >and get 13 digits seeattached but the data out of the back is only 12 >digits reliable. >Looking it up I found out that the ISC570B is a teeny - tiny IC which >for me would pose a problem to implement. > >So looking at alternatives that I already had I came up with two >possible alternative multiplier ideas. >The first was to put the 10 MHz DUT into the external reference of my >(boat anchor) HP signal generator set the output frequency to 200 MHz >and put the output into the channel 1 input to get extra resolution >digits. >Expanding upon that, I came with more complex but what may be a better >error multiplier reading since I have both signal generators on hand. >First I feed the 10 MHz DUT signal into my Fluke 6080 setting the >output to 1 GHz. I'd then feed the reference 10 MHz signal into the >external reference of my HP 8656 and set the output to 990 MHz. >Next I'd feed both outputs into a >AD8342 LF to 3.8GHZ Active Mixer Down conversion Output withBalun >Transformer > >board from ebay ($23) and then feed the multiplied signal into channel >1. (I may need a simple low pass filter.) > > >This should give me a 100X error multiplication. > > >Am I on the right track or am I missing something? > > >Regards, >Perrier > > > > > > > > > > > > > > > > > >_______________________________________________ >time-nuts mailing list -- time-nuts@lists.febo.com >To unsubscribe, go to >http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >and follow the instructions there. Sent with mySecureMail. http://www.mysecurephone.eu/ _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.