> M. Warner Losh wrote: >> In message: <[EMAIL PROTECTED]> >> Dr Bruce Griffiths <[EMAIL PROTECTED]> writes: >> : The Allan deviation of current state of the art cryogenic sapphire >> : oscillators is more than an order of magnitude lower than the noise >> : floor of these instruments. >> >> I'm curious. How much does one of these oscillators cost? >> >> Warner >> >> These devices usually operate at around 11GHz in temperature controlled Liquid helium cryostats and are not produced commercially they are custom built. The University of Western Australia has built some of the best examples of these devices. http://arxiv.org/ftp/physics/papers/0608/0608124.pdf#search=%22hydrogen%20maser%20Kvarz%22
http://www.fsm.physics.uwa.edu.au/History.html Lower Q room temperature microwave whispering Gallery sapphire resonator oscillators are available commercially. http://www.psi.com.au/ Bruce _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
