Bruce Griffiths wrote:
Bruce Griffiths wrote:Additional references that estimate the degree of tank mistuning permissable before asynchronous modes occur:Hal Murray wrote:Asynchronous modes such as 10.000001MHz plus 15.999999 MHz can be problematic if the loop delay is too high. http://www.femto-st.fr/~rubiola/pdf-articles/journal/1992im%28rubiola%29regenerative-divider-noise.pdf <http://www.femto-st.fr/%7Erubiola/pdf-articles/journal/1992im%28rubiola%29regenerative-divider-noise.pdf>bruce.griffi...@xtra.co.nz said:The 16MHz is necessary for the loop to function: The mixer mixes down the 26MHz to a pair of conjugate frequencies, 10MHz and 16MHz. Thermal andWhat makes it stable at 10 and 16 MHz rather than 10.000001 and 15.999999?device noise is sufficient to start the process. 10MHz = 26MHz - 16MHz 16MHz = 26MHz - 10MHzI'm assuming we are starting with a good 26 MHz crystal and that it would be hard to get filters that good.http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F26%2F23863%2F01093262.pdf%3Farnumber%3D1093262&authDecision=-203 <http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F26%2F23863%2F01093262.pdf%3Farnumber%3D1093262&authDecision=-203>http://tf.nist.gov/general/pdf/1800.pdf Brucehttp://www.its.caltech.edu/~kaushiks/KS_RFIC.pdf <http://www.its.caltech.edu/%7Ekaushiks/KS_RFIC.pdf>http://www.its.caltech.edu/~kaushiks/KS_TCAS.pdf <http://www.its.caltech.edu/%7Ekaushiks/KS_TCAS.pdf>An early implementation:http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA457231 <http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA457231>Bruce
If one needs a frequency comb: http://tf.nist.gov/general/pdf/2168.pdf Bruce _______________________________________________ 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.
