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

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

[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:

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

[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 (

to have it restored. It is apparently quite rare. DaveB, NZ -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Thomas D. Erb Sent: Tuesday, March 13, 2018 00:44 To: time-nuts@febo.com Subject: Re: [time-nuts] Recommendations for Mains Power Monitor

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

Year ago we used to sell a quartz clock and a 60hz clock mounted on a panel for generator stations on small islands in the Caribbean. This is the way it was done in the 1930's http://electricclock.omeka.net/items/show/6

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

23:13:26: > Von: Attila Kinali <att...@kinali.ch> > An: Discussion of precise time and frequency measurement <time-nuts@febo.com> > Datum: 11.03.2018 23:30 > Betreff: Re: [time-nuts] Recommendations for Mains Power Monitor / Logger > Gesendet von: "time-nuts" <t

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

Hi, On 03/11/2018 11:25 PM, Tom Van Baak wrote: >> In short, the GPS to UTC time correction polynomial got screwed up. > > Yes, that was an exciting time! > As far as monitoring mains phase -- a 13 microsecond step would be lost in > the normal jitter and drift of power line timing. My 60 Hz

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

Hi If you pick the “right” STM board, it can handle processing up around a megasample. It’s internal ADC’s are more of an issue than the sample rate. You can only do just so well on harmonics with a 12-ish bit ADC. Even if you go crazy and get one with a display, they still are pretty cheap.

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

> In short, the GPS to UTC time correction polynomial got screwed up. Yes, that was an exciting time! For newcomers to the list, the bizarre GPS 13 microsecond jump was a hot topic on time-nuts back in 26-Jan-2016. The thread starts with an observation by Paul Boven:

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

On Sun, 11 Mar 2018 14:41:23 -0500 Dana Whitlow wrote: > I'll have to take a look around to see if there isn't something cheap that > can run > standalone so I don't have to tie up (or wear out) a whole PC for the > acquistion > process. Blub... I should the whole

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

Hi Cute !! It certainly beats firing up an R-392 to see if you can get a tick from WWV… Bob > On Mar 11, 2018, at 5:42 PM, Tom Van Baak wrote: > >> “Back in the day” we used WWV and the kitchen clock for that sort of thing…… > > Bob, > > Yes, not much has changed. I

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

On Sun, 11 Mar 2018 14:41:23 -0500 Dana Whitlow wrote: > Now I'm getting interested in this. My concept is to take the 60 Hz in, do > reasonable > HW filtering to knock off the HF junk that commonly rides on the sinewave, > then use > an RC quadrature phase splitter to

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

> “Back in the day” we used WWV and the kitchen clock for that sort of thing…… Bob, Yes, not much has changed. I use multiple methods to measure 60 Hz in order to gain confidence in the results. Besides the picPET, I've used a commercial TrueTime TFDM (Time/Frequency Deviation Meter) and also

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

Hi Andy, On 03/11/2018 08:40 PM, Andy Backus wrote: > Thank you for your posting, Magnus. > > Your information is very interesting. > > Do you mind saying a little more about the "incident" on 26-JAN-2016? I > don't find reference to it in the link. And my own TE plot for then shows no >

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

ime-nuts-boun...@febo.com> on behalf of Bill Hawkins <bill.i...@pobox.com> Sent: Saturday, March 10, 2018 11:40 PM To: 'Bob Albert'; 'Discussion of precise time and frequency measurement'; 'Patrick Murphy' Subject: Re: [time-nuts] Recommendations for Mains Power Monitor /

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

t; wave there's a lot you can do with this method besides making charts of > > time drift or frequency deviation from the zero-crossings. > > > > For an even cheaper solution, forget the GPS receiver and the R channel > -- > > since the PC (if running NTP) already knows the correc

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

Hi, I'd like to add two things: On Sat, 10 Mar 2018 20:46:16 -0800 "Tom Van Baak" wrote: > 1) Safety. I usually use a low voltage step-down transformer. This gives > isolation and safety. Anything from 3 VAC to 24 VAC is fine. Please, do not just add a transformer. Make

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

I used to have one of the FNET units to help them with data and to keep track of things myself during a period of low voltage in the summer months. The lowest voltage I saw was about 70 volts. Months of contacting ComEd directly with the excellent data provided by the unit accomplished nothing. An

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

GPS 1PPS into the R channel. "The rest >> is just software." Note that because you have access to the entire sine wave >> there's a lot you can do with this method besides making charts of time >> drift or frequency deviation from the zero-crossings. >> >> For

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

time. And skip the > AC transformer too -- instead just hang a foot of wire off the L channel > input. There's mains hum everywhere. It would be the one time in your life > where the ever-present audio hum actually has a good use. > > /tvb > > - Original Message - > From: &q

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

> Subject: Re: [time-nuts] Recommendations for Mains Power Monitor / Logger Bob, Correct, measuring mains frequency to a couple of digits is not hard. What makes an interesting challenge is to monitor mains, "kitchen clock", phase drift. And to do it with cycle accuracy; no slips

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

ST a few hours ago. > > - Original Message - > From: "Bob kb8tq" <kb...@n1k.org> > To: "Discussion of precise time and frequency measurement" > <time-nuts@febo.com> > Sent: Sunday, March 11, 2018 4:53 AM > Subject: Re: [time-nuts] Recomme

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

a foot of wire off the L channel input. > There's mains hum everywhere. It would be the one time in your life where the > ever-present audio hum actually has a good use. > > /tvb > > - Original Message - > From: "Patrick Murphy" <fgdhr...@gmail.com> > To:

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

Well, this synchronization follows the laws of physics. If the energy generated doesn't equal the energy consumed, then the frequency may raise or lower. This is for steam turbines. If the energy come front an inverter from a DC tie line, as it does from the four regions in the US, the frequency

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

rch 10, 2018 2:53 PM Subject: [time-nuts] Recommendations for Mains Power Monitor / Logger All this talk of varying mains power frequency aberrations has me curious what is happening in my own back yard here in Tulsa in the USA. Can some recommend a reasonable "introductory level" solution

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

There isn't a whole lot of justification for measuring power line frequency.  We are all synchronized (in the first world at least) and while there are phase instabilities, it's seldom the frequency varies enough to overcome the noise. As for voltage, it's much more steady than several years

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

One possibility is to get an FNET/GridEye unit of the University of Tennessee's monitoring stations. Operated by the Power Information Technology Laboratory at the University of Tennessee , FNET/GridEye is a low-cost, quickly deployable

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

Hi The most basic question is - what do you have already? My first adventure with line monitoring was with a vacuum tube based counter. It was what I just happened to have. One basic need is something to monitor against. GPS is a pretty cheap option if you have nothing already. Rather

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

I know of two ways to monitor frequency. One is to use one of tvb's PICs. That needs a good frequency reference, probably a GPSDO. The other is to use the PPS input on a Linux box. That uses the system clock so you meed a good NTP setup. Some of the APS family of UPS boxes will monitor the

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

All this talk of varying mains power frequency aberrations has me curious what is happening in my own back yard here in Tulsa in the USA. Can some recommend a reasonable "introductory level" solution for this? (As a fledgling Time-Nut, those two words were hard to say.) At the least I would like