Re: [time-nuts] ? phase comparison or other device

Pete, > > > 5. Mini-circuits BLP-1.9 low pass filter. terminating the mixer if output with an lowpass/bandpass filter and NOT with an diplexer is not so good an idea. Where does the rf go? Best regards Ulrich Bangert > -Ursprüngliche Nachricht- > Von: [EMAIL PROTECTED] > [mailto:[EMAI

Re: [time-nuts] ? phase comparison or other device

WB6BNQ wrote: > Bruce, > > Can you provide a link to the JPL system you reference above ? > > Thank you, > > BillWB6BNQ > > Bill http://ntrs.nasa.gov/index.jsp?method=order&oaiID=19910016462 There is also, or was, a free to d

Re: [time-nuts] ? phase comparison or other device

Dr Bruce Griffiths wrote: > Pete wrote: > > Here is a scheme that seems to work well for comparing stable frequency > > sources in the range of 10 to 100 second measurement intervals. > > > > Objective - Measure frequency to +/-2E-12 in less than 1 minute. > > > > Method - Heterodyne DUT output to

Re: [time-nuts] ? phase comparison or other device

Pete wrote: > Bruce, > > This idea is NOT intended to rival the JPL results. Instead, > it's intended to be cheap, easy to replicate & allow rather > low cost instruments to be used to compare good sources > to parts in 1E12, quickly. The 1KHz heterodyne frequency > makes life much easier than 1Hz.

Re: [time-nuts] ? phase comparison or other device

Bruce, This idea is NOT intended to rival the JPL results. Instead, it's intended to be cheap, easy to replicate & allow rather low cost instruments to be used to compare good sources to parts in 1E12, quickly. The 1KHz heterodyne frequency makes life much easier than 1Hz. Noisy components & grou