> It's bizarre.. > The oscillator is some kind of Colpitts but with > coils instead of capacitors in the feedback path.
The circuit is a Colpitts-type oscillator. The other elements are for mode suppression. The March 1981 issue of Hewlett-Packard Journal explains the entire design of the 10811 in great detail, including this oscillator circuit. On the recent topic of warm up, one of the articles in the above issue mentions that the 10811 is only 100 Hz low at turn-on (as compared to the 10544 which is 1 KHz low at turn-on). Warm up -- defined by an output within 0.05 Hz of operating frequency after turn-on -- takes 10 minutes. -ch _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
