Software 60Hz PLL
Lester B Veenstra MØYCM K1YCM W8YCM [email protected] US Postal Address: 5 Shrine Club Drive HC84 Box 89C Keyser WV 26726 GPS: 39.33675 N 78.9823527 W Telephones: Home: +1-304-289-6057 US cell +1-304-790-9192 Guam Cell: +1-671-929-8141 Jamaica: +1-876-352-7504 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Hal Murray Sent: 10 August 2012 13:37 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 60Hz extra PPS: got one [email protected] said: > Hal, do you have a resonant 60 Hz filter in the pickoff? Not by intent. It's just a wall-wart transformer and then some resistors to get the right level. There are the standard cables (wall wart, RS-232, audio, clip leads). I'm sure there are resonances in there but nothing near 60 Hz. > Remote-controlled tap changers can do things like that. Bingo. Thanks. Here is a graph with the vertical scale zoomed in on the top of the sine peaks so you can see the voltage step. http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a2.png > I expect you'd rather do things in software, but the mechanical solution is > to couple a synchronous motor to a flywheel marked with 60 Hz lines for > photocell pickup. Good idea. Or an old clock motor. Do they still make motor driven clocks? The kind with the flag that drops down and turns red on a power loss rather than blinking 00:00. I should be able to do something with a simple L-C. I'll have to check the numbers. -- These are my opinions. I hate spam. _______________________________________________ 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. _______________________________________________ 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.
