Louis Essen was THE man - hence to the Essen Ring quartz oscillator which was a development from Dye's original work on that particular quartz configuration. The British PO used a bank of Essen Ring references as their standard immediately prior to- and I think during most of- WW2. Not sure re oscillation mode but IIRC the rings had to be suspended from several silk threads. DaveB, NZ
-----Original Message----- From: Bob kb8tq [mailto:[email protected]] Sent: Thursday, April 01, 2021 15:16 To: Poul-Henning Kamp Cc: Discussion of precise time and frequency measurement Subject: [time-nuts] Re: Best frequency to start for GHz synth ? Hi Some of the early 100 KHz resonators were ring shaped. The British really pioneered this side of things ( while the US was still doing bars …) back in the 1930’s. AFIK the mode is not a whispering gallery. Given the low frequency of a 100 KHz resonator, a “not space limited” design might get to some pretty insane Q values. Meter level dimensions probably would be involved. Good luck sourcing the raw quartz :) :) :) ( …. and yes, that’s only the first of a long list of issues ….). Bob > On Mar 31, 2021, at 3:23 PM, Poul-Henning Kamp <[email protected]> wrote: > >> If you were going insane on a fountain, you likely would go with one >> of the sapphire whispering gallery devices as the start of your >> chain. A good one will blow a quartz crystal based part away …. > > That reminds me: > > I think the first quartz-crystal at Bell Labs was ring-shaped, do you know if > that used a whispering gallery vibration mode ? > > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
