[time-nuts] Recommendations for Mains Power Monitor / Logger

Lady Heather v6 now supports the PICPET. I don't think it would like a 60 Hz input, though. When testing receivers with a high navigation rate (like over 20 Hz) it gets overwhelmed processing the data stream and updating the screen. It might work with the PICPET since the sole message that

Re: [time-nuts] Recommendations for Mains Power Monitor / Logger

Reading this paper makes one wonder if there are other improvements that can be made to increase the robustness against jamming, software bugs, solar events or hostile attacks to the GPS system A suggestion: Create a parallel terrestrial GPS system.   This would be a system of GPS transmitter

[time-nuts] Why European Clocks are Running Slow, and British Clocks Aren't

You tube video about line frequency time keeping issues in the EU. https://www.youtube.com/watch?v=bij-JjzCa7o [electrictime] Thomas D. Erb o: 508-359-9684 p: 508-359-4396 x 1700 f: 508-359-4482 a: 97 West Street, Medfield, MA 02052 USA e: t...@electrictime.com

[time-nuts] Recommendations for Mains Power Monitor/Logger

Who made that one? I have three power station master clocks. http://electricclock.omeka.net/items/browse?tags=Power+Station+Master+Clock [electrictime] Thomas D. Erb o: 508-359-9684 p: 508-359-4396 x 1700 f: 508-359-4482 a: 97 West Street, Medfield, MA 02052 USA e: t...@electricti

[time-nuts] Power line frequency monitoring using a PICPET

I kludged up a very simple power line interface (3VAC transformer -> 10K resistor -> diode -> PICPET) and fed the (unfiltered) output into a PICPET. The PICPET was clocked using a 10 MHz TTL oscillator. I used Lady Heather to capture and analyze the data. It was measuring the time interval b

Re: [time-nuts] Recommendations for Mains Power Monitor / Logger --> GPS Issues

Hi > On Mar 12, 2018, at 9:54 AM, Peter Reilley wrote: > > Reading this paper makes one wonder if there are other improvements that > can be made to increase the robustness against jamming, software bugs, solar > events > or hostile attacks to the GPS system > > A suggestion: > > Create a par

Re: [time-nuts] Recommendations for Mains Power Monitor / Logger

I expect 1/R^2 would prevent such a scheme from working as the terrestrial transmitters would vary widely in signal strength in a way that GPS satellites do not and could overload the receiver. David N1HAC On 3/12/18 9:54 AM, Peter Reilley wrote: Reading this paper makes one wonder if there

[time-nuts] Suggest time-and-tech related locations in Switzerland

My wife and I are traveling to Switzerland for the last week in May. I have never been there before. I would appreciate suggestions for time / tech sites of interest to visit. We plan to fly to Zurich, but travel immediately to Geneva and then work our way back to Zurich by train, stopping (at l

[time-nuts] Terrestrial GPS

Peter Reilley suggests a backup to GPS using terrestrial transmitters. This idea has been around since the early days of GPS. The terrestrial transmitters were called "pseudo-satellites", or "pseudolites" for short. The big problem with this idea is that the GPS signal format has a narrow dynamic r

Re: [time-nuts] Suggest time-and-tech related locations in Switzerland

swisswatchtours.com https://m.myswitzerland.com/en-us/factory-and-technical-visits/clock-and-watch-museum-beyer.html Content by Scott Typos by Siri On Mar 13, 2018, at 5:58 PM, David Witten wrote: My wife and I are traveling to Switzerland for the last week in May. I have never been there bef

Re: [time-nuts] Terrestrial GPS

Have you noticed that your mobile devices (smartphone, iPad, tablet PC, laptop PC) can often know your location when you inside a building shielding you from GPS satellites (or producing multipath confusing the GPS receiver)? Here is a quick test you can do if you have a PC with no GPS receiver bu

[time-nuts] Stephen Hawking, an honorary time-nut

"Stephen Hawking dies aged 76" http://www.bbc.com/news/uk-43396008 "Obituary: Stephen Hawking" http://www.bbc.com/news/science-environment-1565 "Stephen Hawking, modern cosmology's brightest star, dies aged 76" https://www.theguardian.com/science/2018/mar/14/stephen-hawking-professor-dies-age