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

> I've done some Googling and have found any number of designs. Pat, 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. 2) Trigger. There are dozens of schematics on the web for capturing the zero-crossing of a

[time-nuts] FURUNO GT-80 for Brandywine GPS-4

The GT80 is a family of devices including the 8031 and 8037. Perhaps posting a picture would help. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instruction

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 ago

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 GPS-synchronize

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 than

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 t

Re: [time-nuts] FURUNO GT-80 for Brandywine GPS-4

Hi, My GPS-4 has a FURUNO GT-80 receiver, as per the subject line. The receiver module says "GT-80B5F". I was hoping I might somehow be able to find a replacement receiver, to repair the GPS-4. The GT-80 is getting power, just seems to have gone deaf in terms of satellite reception. Alternative

[time-nuts] Time Nut toys....

Here are a few WVVB items, I found while looking over YT which I found interesting and even drool worthy. MSF Radio Clock Data Monitor start-up https://www.youtube.com/watch?v=PHfeSe6PDbU DCF77 Analyzer / Clock v.2 demo https://youtu.be/ZadSU_DT-Ks WWVB Atomic Clock https://www.youtu