On Mon, 20 Apr 2009 09:03:36 +1200, Bruce Griffiths wrote: >Corby Dawson wrote: >> Arnold, >> >> Look at the top of page 3 on the link below. Not sure how they arrived at >> their conclusion but there is one opinion on the HP mixers! >> >> http://www.unusualresearch.com/AppNotes/TimeNuts/OptDualMixer.pdf >> >> Corby Dawson >> ____________________________________________________________ >> Debt collectors calling your house? Click here to consolidate into one >> payment. >> http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTIk3l9oQnolYGEY40TVwmsBD4opDDeVSRG36KHWHhZWexSiuRrXdm/ >> >> _______________________________________________ >> 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. >> >> >Statements about the low flicker noise of these mixers are sprinkled >throughout the phase noise literature. >Someone must have measured the phase noise of these and other mixers at >some time.
>Its relatively easy to measure mixer phase noise: >All one needs is a low noise preamp plus a sound card a 90 degree hybrid >(or a suitable length of coax and a splitter) and a low noise source. >However NIST papers often include a phase noise plot (attached) that >illustrates that high level mixers can have a significantly lower phase >noise than low level mixers (like the HP10514A). >When choosing a mixer for this for phase noise measurement applications >one may actually need to measure the phase noise characteristics of >candidate mixers. >Bruce Wow, a good overview, Bruce! But remain the questions: which are these high level mixers, are they readily available? Are they affordable? Perhaps not, why are they then not applied more often? Arnold _______________________________________________ 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.
