Re: [time-nuts] A Research Proposal

awkins On Thu, Jul 4, 2019, at 2:00 PM, Andy Backus wrote: > Historically, and even today, the steady frequency of AC power has > been used for timekeeping. So there may be interest here in the > following research proposal: > > Within a given power distribution grid, severa

[time-nuts] A Research Proposal

disturbances such as rapid load changes or sudden generation adjustments, for example, it is quite possible harmonic ripples could be propagated through the system. Such effects could be observed by comparing phase data across significant distances within a distribution grid. Andy Backus

Re: [time-nuts] BG7TBL 10 MHz OCXO

bout +/- 1 mHz Gravity effects (looking at the front panel) -- rotation 90 degrees counter clockwise causes a 5.8 mHz decrease in frequency rotation 180 degrees causes a 5.3 mHz increase in frequency rotation 90 degrees clockwise causes a 12.5 mHz increase in frequency A

[time-nuts] BG7TBL 10 MHz OCXO

reversible) Andy Backus ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time

Re: [time-nuts] HP Stories: Battery Chargers, and a fading idolization of HP

Brings to mind two interesting numbers: I figured out when I was ten that it takes about 2 weeks to count to a million at one number/sec. Much later in graduate school I learned from an astronomer that a year has pi x 10^7 seconds. Andy Backus From: time-nuts

Re: [time-nuts] WWVB Translation

the antenna current. I have found, as others have, that the frequency must be good to several Hertz. So I use a crystal controlled CMOS gate oscillator to generate the RF. Andy Backus WA2TND From: time-nuts on behalf of paul swed Sent: Saturday, October 27, 2018

[time-nuts] WWVB Translation

know yet if it also lights up the neighbor's house. I think I will investigate that question when (and if) they pull the plug in Colorado. But I am prepared. Not so much for my La Crosse Technology WWVB BPSK clock. I think it will get swamped out. Can't have everything, I guess. Andy

Re: [time-nuts] WWVB Signal Generator

. Also -- when the GlobalTop loses a fix it still puts out the RMC sentence, just without the lat and lon data. And the PPS immediately stops. I designed the parsing scheme to account for that. How long that reporting would continue I don't know. Andy Backus

[time-nuts] WWVB Translation/Simulation from GPS Data

on the day of. Andy Backus From: time-nuts on behalf of Wayne Holder Sent: Wednesday, September 5, 2018 3:01 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] WWVB Signal Generator I've reworked my WWVB Simulator so it can now run

Re: [time-nuts] Bicentennial GOES satellite clock

A good sextant with a good operator can measure apparent altitude to 0.1 minutes of arc. The fastest apparent motion of objects in the sky due to rotation of the earth is 0.25 minutes of arc per second. So the best a sextant can do with time (assuming accurate astronomical tables and an exact

Re: [time-nuts] NIST

WWV HF transmissions include a 100 Hz subcarrier that gives the info in cw format. For generating WWVB code I would suggest simply counting seconds to yield days -- the WWVB code takes the day number in the year. Leap year is easy. Just look up the DST start and stop. acb

Re: [time-nuts] Setting Time on WSPR Radio Transmitter

A cheap WWVB watch will do the trick. Andy Backus From: time-nuts on behalf of Brooke Clarke Sent: Friday, June 22, 2018 9:58 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Setting Time on WSPR Radio Transmitter Hi: I'm