Re: [time-nuts] WWVB Simulator

You don't need to tie up a PC.It could likely output the WWVB signal while it was also surfing the web and reading emails. 60KHz is NOTHING compared to displaying a you-tube video In fact I bet your 48MHz uP could directly synthesize the signal. Look at the ratio of 48 MHz / 60 KHz. The uP

Re: [time-nuts] Line Voltage - USA

Did the utility replace the damaged equipment? On Tue, Jan 3, 2017 at 9:33 PM Van Horn, David < david.vanh...@backcountryaccess.com> wrote: > I once had some odd equipment failures which we found out were caused by > the line voltage being at 142V. > > This was in the mid 80's in Costa Mesa CA.

Re: [time-nuts] Line Voltage - USA

I once had some odd equipment failures which we found out were caused by the line voltage being at 142V. This was in the mid 80's in Costa Mesa CA. The tech they sent out told me they had us on the wrong transformer tap. Lowest I've seen was 70V in Hawaii, with everyone coming home about 5PM

Re: [time-nuts] WWVB Simulator

Sure. I considered software. But I'm a hardware guy. I like designing boards. The rig was designed to do amplitude and phase simply. The final design will have a $5 48 MHz microprocessor included. I'm using that one because of speed and memory. When that proves out I might redesign for a $2 24

Re: [time-nuts] Line Voltage - USA

Leap seconds only matter if you are counting seconds. The power line isn't. As long as they keep the frequency near nominal, they are fine. -Chuck Harris J wrote: > Power utilities tweak the system frequency on a daily basis to keep MAINS > powered clocks correct. I wonder what their

Re: [time-nuts] Line Voltage - USA

HI > On Jan 3, 2017, at 6:59 PM, Hal Murray wrote: > > > kb...@n1k.org said: >> They sell a lot of 24 bit audio DAC’s into that sort of gear. Team them up >> with some DSP and you get all sorts of interesting data. The “one number” >> that counts is the fundamental ….

[time-nuts] Updating Garmin GPS 25 LP after GPS week rollover

Recently, I was invited to an event to celebrate the addition of a leap second. I thought I would provide the entertainment by bringing a suitable GPS receiver plus a laptop running Lady Heather. I had done this before, so I thought it would be easy, but a whole collection of things went wrong,

Re: [time-nuts] Line Voltage - USA

kb...@n1k.org said: > They sell a lot of 24 bit audio DAC’s into that sort of gear. Team them up > with some DSP and you get all sorts of interesting data. The “one number” > that counts is the fundamental …. DAC? There is a big market for high resolution ADCs in that area - one in

[time-nuts] leap second too early on TDF timesignal

It seems France's TDF timesignal (phase modulation of a 162 kHz carrier, which until the end of 2016 also carried France Inter radio sound as amplitude modulation) inserted their leapsecond a minute early. Like MSF and DCF77, TDF transmits one bit per second, together composing the exact time at

Re: [time-nuts] Line Voltage - USA

Power utilities tweak the system frequency on a daily basis to keep MAINS powered clocks correct. I wonder what their correction strategy was for the leap second? On Tue, Jan 3, 2017 at 11:05 AM, Vlad wrote: > > > Speaking about MAIN... I was interesting to see if "leap second"

Re: [time-nuts] Temperature (environmental) sensors

I like the Bosch BME280 conneced to a Raspberry PI. https://learn.adafruit.com/adafruit-bme280-humidity-barometric-pressure-temperature-sensor-breakout/pinouts https://github.com/adafruit/Adafruit_Python_BME280/blob/master/README.md --   Björn Sent from my smartphone. Original message

Re: [time-nuts] Temperature (environmental) sensors

I've used the Dallas (now Maxim) Thermochron iButtons in several applications. Looks like a thick coin with battery, ram and RTC built in. Even used dozens of them map temperature distribution in a aircraft fuel tank. Also available as a 1-wire device. For precision I've used Pico Technology

Re: [time-nuts] FE-5650A option 58 tuning word for 10 MHz output

On 2017-01-02 12:18, Attila Kinali wrote: Attila! Nice to see you around here ond au der es guez nois! May I ask what you want to achieve? Resp. what you need a 10MHz reference for? I've always been wondering about those devices, I guess out of pure curiosity. Once I learned that those

Re: [time-nuts] Temperature (environmental) sensors

Hi Tom: I've used the Onset data loggers and they are very inexpensive and work well. As a plus they are PIC based so hackable. Don't know about accuracy, resolution http://www.onsetcomp.com/products/data-loggers http://www.prc68.com/I/Hobo.html http://www.prc68.com/I/GPend.shtml The

Re: [time-nuts] EFOS2 MASER turns 34!

Thanks, I will look on Tom's site for the manuals. The last time I looked into this, I think all I saw were copper cavities. But I think some sort of design that required very minimal machining, and much more "plumbing", would be what I would need to do a homebrew maser :-). Tim N3QE On Tue,

Re: [time-nuts] Line Voltage - USA

Hi Measuring line voltage for “official” purposes straight up with a lab grade device that may have a bandwidth of many KHz (or even 100’s of KHz) is generally not a good way to go. The line voltage is the value of the fundamental (50 or 60 Hz) sine wave. All the other nonsense that

Re: [time-nuts] Temperature (environmental) sensors

Yesterday hackaday had a link to a humidy sensor comparison: http://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html Em 03/01/2017 16:03, Mark Sims escreveu: I did a LOT of testing environmental sensors when I built my ultrasonic anemometer weather station that is part of a rocket

Re: [time-nuts] Line Voltage - USA

On 2 January 2017 at 05:15, Jeremy Nichols wrote: > Thank you for the detailed analysis, Bill. The voltage measurements I made > in my garage laboratory were duplicated by the utility with their meter, > which was connected at the service entrance. I have just been chatting

Re: [time-nuts] Temperature (environmental) sensors

The sensor Jim linked : Temp/humidity with I2C interface https://www.adafruit.com/products/1293 looks good - packaged, high res temperature, etc. It's not 'complete' in that it's only a sensor, but you only have to attach a USB-I2C adapter. Probably less work than connecting up the sparkfun

Re: [time-nuts] Temperature (environmental) sensors

Hi There’s always the “cool factor” of higher resolution. Apparently it’s not enough of a issue to make it a worthwhile market to serve. Based on what has been tossed around, it sounds like an Arduino with some bits plugged in is the low cost leader. 3D print up and enclosure and you have

Re: [time-nuts] 5372A A7 CPU board

It's not there on my copy either. A7 CPU is assembly level repair. All others are component level repair. Page 6-9 of the 05272-90016 service manual says: The A7 board has eight 1 Mbit RAM ICs having a total system memory of 256K long words, each 32-bits wide. And, The program is stored in 768

[time-nuts] EFOS2 MASER turns 34!

Tim, The EFOS2 uses an Aluminum cavity! So machining would be easier than Copper! The complete manuals with schematics are on Tom's Leapsecond.com site. Making a homebrew Maser was bandied about a few years ago on TimeNuts. Cheers, Corby ___

Re: [time-nuts] Temperature (environmental) sensors

The good news is if the dataloger you get has a mems pressure sensor, you will have a high precision temperature sensor, whether or not the product software provides that resolution to you is another matter. In addition to the piezo-resistive bridge being mechanically sensitive to diaphragm

Re: [time-nuts] Line Voltage - USA

I put some raw data here: http://www.patoka.ca/OCXO/60HZ.logs.tar.Z Unfortunately its not continuous, because of for some period of times my machine was offline (software upgrades or my radio made some mess with RF which affects the MCU and recordings. And I was busy with something else

[time-nuts] Temperature (environmental) sensors

I did a LOT of testing environmental sensors when I built my ultrasonic anemometer weather station that is part of a rocket launch control system. The best humidity sensor I found was the DHT21/SHT11/AM2301/SHT15. They run around $3 and can also provide temperature to 0.1C res / 0.5C

Re: [time-nuts] Temperature (environmental) sensors

On 1/3/17 9:15 AM, Bob Camp wrote: Hi There is an ever increasing pool of good sensors to put into something like this. (More so for temperature and pressure. Humidity still is a bit of an issue.) There’s not a lot to interface between the sensor and a USB “chip”. It’s surprising that there

Re: [time-nuts] Line Voltage - USA

I noticed following information (source: http://www.mainsfrequency.com/news.htm#2015_1): Minimum and maximum mains frequency To clarify the question "how stable is the mains frequency", data of the last 13 months was analyzed (July 2011 to July 2012). The greatest fluctuations occurred

Re: [time-nuts] Temperature (environmental) sensors

Hi There is an ever increasing pool of good sensors to put into something like this. (More so for temperature and pressure. Humidity still is a bit of an issue.) There’s not a lot to interface between the sensor and a USB “chip”. It’s surprising that there aren’t more cheap / high accuracy

Re: [time-nuts] Temperature (environmental) sensors

These https://www.adafruit.com/products/381 are .0625C resolution, 1-wire interface (temp only) This one https://www.adafruit.com/products/642 has Teflon insulation, for use at higher temps Or this one, Temp/humidity with I2C interface https://www.adafruit.com/products/1293 On Tue, Jan 3, 2017

Re: [time-nuts] Line Voltage - USA

Vlad do you have that data for a longer period of time...say 3 to 6 months? Dave On 1/3/2017 11:05 AM, Vlad wrote: Speaking about MAIN... I was interesting to see if "leap second" event has correlation with MAIN frequency fluctuation Here is graphs for the MAIN periods recorded. Note:

Re: [time-nuts] Temperature (environmental) sensors

All these (including the one I linked) seem to be 0.5C only. This one gets to 0.2C : http://www.ti.com/tool/hdc1010evm On Tue, Jan 3, 2017 at 4:09 PM, Paul Alfille wrote: > If you don't mind using 1-wire sensors, there are many nice choices, like: > >

Re: [time-nuts] Line Voltage - USA

On 2 January 2017 at 18:14, Poul-Henning Kamp wrote: > > In message qnosgqvz...@mail.gmail.com> > , Tim Shoppa writes: > > >What modern loads are actually sensitive to high (say, +10 to +20%) line > >voltage? > > In EU you're supposed to have 230V +/- 6% in your

Re: [time-nuts] Temperature (environmental) sensors

If you don't mind using 1-wire sensors, there are many nice choices, like: http://www.embeddeddatasystems.com/Environmental-Sensors_c_44.html for temperature/humidity/barometric pressure... On Tue, Jan 3, 2017 at 10:22 AM, jimlux wrote: > On 1/3/17 7:08 AM, Tom Van Baak

Re: [time-nuts] Line Voltage - USA

Speaking about MAIN... I was interesting to see if "leap second" event has correlation with MAIN frequency fluctuation Here is graphs for the MAIN periods recorded. Note: The data on the charts is "smoothed" by Bezier curves I could see some "surge" which starts to climb in December 30

Re: [time-nuts] Temperature (environmental) sensors

On 1/3/17 7:08 AM, Tom Van Baak wrote: I have some high-end temperature and pressure instruments. But for casual use in my home and mobile timing lab I use Sparkfun Weather Stations. The old URL is: https://www.sparkfun.com/products/retired/10586 Replaced by

Re: [time-nuts] Temperature (environmental) sensors

I haven't used this current generation of loggers (I do have a couple of older RS232 units) but there's quite a range at https://www.lascarelectronics.com/markets/environmental/ On Tue, Jan 3, 2017 at 3:08 PM, Tom Van Baak wrote: > I have some high-end temperature and

[time-nuts] Temperature (environmental) sensors

I have some high-end temperature and pressure instruments. But for casual use in my home and mobile timing lab I use Sparkfun Weather Stations. The old URL is: https://www.sparkfun.com/products/retired/10586 It's USB, talk-only, one reading a second, temperature, pressure, humidity --

Re: [time-nuts] Anyone (ideally in the UK) got a spare rotary knob for the 5370B TI counter?

On 30 December 2016 at 23:58, Dr. David Kirkby - Kirkby Microwave Ltd < drkir...@kirkbymicrowave.co.uk> wrote: > I bought a 5370B TI counter which arrived today. It needs a bit of TLC, > but nothing too bad. But one of the rotary knobs is incomplete. Does anyone > have a spare knob? Contact me