Re: [time-nuts] Li-ion Battreries

Whatever makes you feel safe, Mark. The internet has a plenitude of horror stories, some of which would make you think that the only prudent course was to store them in an underground bunker. Our study used several hundred batteries, all stored in surplus cal .50 ammunition cases in

Re: [time-nuts] Li-ion Battreries

Those hobby packs are typically LiPO, chosen for the energy density, and they often (usually?) run them with minimal protection circuits to reduce weight. Not recommended practice for building devices. BMS When I built a 12 cell series 10Ah pack, I went with LiFePO4 and a custom-configured

Re: [time-nuts] purpose of time of day display units

I do stuff like that too. I always like to use an I2C connected LCD display while developing code on any micro processor project. I might take the actual LCD off at the end but I always leave the signal pins in place. I might need to debug the device again some time and then I can find another

[time-nuts] galileo-atomic-clock-failures

Perhaps of general interest for time-nuts: http://spaceflight101.com/galileo-atomic-clock-failures/ https://www.spaceintelreport.com/galileo-clocks kind regards Arnold, DK2WT ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Li-ion Battreries

They can be if you store them in something like an ammo box. If they "go off" in the sealed box the pressure builds, the reaction rate increases exponentially, and voila... shrapnel time. There's a video out there showing the results. Most people recommend storing them in nomex/kevlar

Re: [time-nuts] purpose of time of day display units

On 01/22/2017 07:26 PM, Hal Murray wrote: Many years ago, I designed network gear. That was back when a controller was a board full of small and medium sized chips rather than a single big chip. I always put a few LEDs on the board wired up where the microcode could get at them. Most of the

Re: [time-nuts] purpose of time of day display units

I have done something similar to one of my cars so that, for example, an LED that tells me when the a/c compressor's electric clutch cycles on and off. Things like this are partly eye candy, partly educational (things don't always work quite like I assume they do), and partly a valuable diagnostic

Re: [time-nuts] purpose of time of day display units

There is a lot to be said about a tool that just works. In the advent of a piece of gear failing whether that be a firmware bug or a cooling fan, or more severe, having a known diagnostic tool during that time is priceless (well maybe not priceless but extremely nice to have). On Sun, Jan 22,

Re: [time-nuts] HP 5061A/B Cesium tube conundrum

Corby Curious if you ever received any other comments or had success? Regards Paul WB8TSL On Mon, Jan 16, 2017 at 5:07 PM, paul swed wrote: > Corby thats a heck of a puzzle. I am trying to think about how you could > prove it. I have some thoughts that are not at all well

Re: [time-nuts] purpose of time of day display units

jim...@earthlink.net said: > 3) It's a crude visual check - your eye/brain is pretty good at catching a > change in the pattern of blinky lights. IN this situation, you'd expect > all the displays to change simultaneously. Is there a term similar to "eye candy" for geeks? Many years ago, I

[time-nuts] Manual and Software for R (Meinberg) ED170MP GPS Receiver?

All- I just acquired a Rohde & Schwarz (actually a Meinberg) ED170MP GPS Receiver (and antenna) and I'd like to get it going. Can someone here point me to the manual and any software for it? Thanks! Dave K2DH ___ time-nuts mailing list --

[time-nuts] Li-ion Battreries

In the days prior to my recent retirement, when I was directing research at a large VA Medical Center, one of our projects used inordinate quantities of 18650 Li-ion batteries. We found in short order that buying from Amazon or eBay was penny wise and pound foolish. Rather than flogging the

Re: [time-nuts] Li-ion Battreries

On Sun, Jan 22, 2017 at 9:36 AM, Mark Sims wrote: > I have a LOT of experience in testing and using 18650 cells. It is a > horrible place for the un-initiated to be. The market is so saturated with > dangerous fakes and inferior, over-speced cells that finding a genuine

Re: [time-nuts] Li-ion Battreries

The reason I made the post is after bad experiences I found a vendor with genuine product and willingness to send you data sheets and my tests confirm data within 3%. Can not ask for more. Can tell all the stories mentioned, been there done it, that is why I felt it will be useful for time

Re: [time-nuts] Allan Variance with an HP53132a counter

Hi, There is two types of errors done when using this type of counters, First, the delta-estimator of frequency filtering will skew the Allan deviation, mostly in the white phase noise region but the effect wears of at the length of the averaging windown of the counter. Correct interleave

Re: [time-nuts] purpose of time of day display units

I used to work at a place that used a lot of those LED time displays that were hooked up to IRIG. Why were they there? Because everyone hates to toss out nice working equipment. The displays were bought ages ago and still work just fine. Many of those racks you see were assembled 15 or

Re: [time-nuts] Li-ion Battreries

I'm using Lithium batteries too. Button for everything. For stationary lab bench use where AC mains is available and all I want is back up our the lead/acid gel cells work fine. They are cheap, large and heavy and will take abuse and don't normally catch fire. For the mobile devices that I

[time-nuts] Torpey Controls/Torpey Time CLK-5 Master Clock manual or schematic.

Hello all, I'm looking for a manual with schematics or at least an electronic copy of the schematics. Thank you, Merchison ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Li-ion Battreries

One of my hats is working with a recycler to help them best utilize their input stream of recycled electronics. To that end, I take a lot of things apart, looking for failure mechanisms. This allows me to discover common problems, and to suggest which items are economical to repair, and which

Re: [time-nuts] purpose of time of day display units

#5) Everyone likes blinkenlights. > On Jan 22, 2017, at 08:55, jimlux wrote: > >> On 1/21/17 10:31 PM, Ruslan Nabioullin wrote: >> Hi, looking at pictures of various time metrology equipment setups for >> best practices and inspiration, I have commonly seen time of day

[time-nuts] Li-ion Battreries

I have a LOT of experience in testing and using 18650 cells. It is a horrible place for the un-initiated to be. The market is so saturated with dangerous fakes and inferior, over-speced cells that finding a genuine cell is a vanishingly small probability. Hopefully the seller mentioned

Re: [time-nuts] Li-ion Battreries

Recovered cells aren't only sold through ebay parts adverts - they're also used for production. I recently bought a few cell phone boosters which consist of an 18650, a charge circuit and a voltage booster to 5V. They were low cost and nicely made with an extruded aluminium case and they worked

Re: [time-nuts] Allan Variance with an HP53132a counter

You don't need the OCXO option for the 53132... you need a stable and accurate source like a GPSDO that will be your reference. Consider buying the HP53132 but also a GPSDO. Is the 162kHz transmitter the Allouis one (TDF/Syrte)? On Sun, Jan 22, 2017 at 3:52 PM, Gilles Clement

Re: [time-nuts] Li-ion Battreries

Well worth mentioning that you have found a reputable vendor. I may give them a try. A while back, I bought a dozen 18650 inexpensive(<$5 each) cells from 3 vendors picked at semi-random on eBay (4 from each) for evaluation and I tested each one of them with a data logger. The best one had about

Re: [time-nuts] Li-ion Battreries

Just a quiet message that needs to be said: 18650 style LiIon cells are indeed one of the most common styles of LiIon cells, but with their popularity comes a great deal of fraudulent sales activity. The 18650 cells are used in all sorts of trendy gadgets, like the vape appliences for niccotine

Re: [time-nuts] OT: Eagle PC CAD now Autodesk, $500/year

The .INF file seems just to be a text description, and the non-versioned .ext/.zip/.run file  file is a link to the file one with the version number.  So either one will get you the same installer, and the .INF file isn't needed. Sent from BlueMail ​ On Jan 21, 2017, 9:45 PM, at 9:45 PM,

[time-nuts] Allan Variance with an HP53132a counter

Hi, I am new to this list and have been following it for a while with great interest. I am afraid I am getting contaminated with the "TN" virus… ! I developed a home-brewed OCXO crystal oscillator disciplined with a long wave radio station signal (162 kHz). Its working quite well with a long

Re: [time-nuts] Li-ion Battreries

I use 4 cell balancing and protection circuits, cost a couple of $ more but well worth it, I use holders because of limited availability of cells with straps, but rest assured they are held down (discarded PCB)'s, I on purpose did not get into technical details I was only trying to share

Re: [time-nuts] purpose of time of day display units

On 1/21/17 10:31 PM, Ruslan Nabioullin wrote: Hi, looking at pictures of various time metrology equipment setups for best practices and inspiration, I have commonly seen time of day display unit(s) installed in racks containing processing or time transfer equipment, e.g.,

Re: [time-nuts] purpose of time of day display units

The big clocks on the walls of the control center were largely eye-candy for visitors, but the individual clocks at each console were continuously used by the operators for everything (there was no computer display of time). All important technical timing was run from dedicated sequencers but it

Re: [time-nuts] Li-ion Battreries

Hoi Bert, On Sat, 21 Jan 2017 08:08:22 -0500 Bert Kehren via time-nuts wrote: > purchased _2x Samsung 35E 3500mAh 10A 18650 High Drain Rechargeable Battery > > INR18650-35E_ > (http://www.ebay.com/itm/112173495496?_trksid=p2060353.m2749.l2649=STRK:MEBIDX:IT) > for

Re: [time-nuts] purpose of time of day display units

In message <537e808d-731c-42de-90f3-bec55363b...@sfr.fr>, Mike Cook writes: >All that these units do is merely display the time of day and >sometimes the date, typically by means of seven segment LED displays, >of the time code inputted to them (typically IRIG-B, I'm guessing). I can

Re: [time-nuts] 10MHz to 25MHz

From: Charles Steinmetz Try this: Best regards, Charles = Not for the UK, it seems. Is it on YouTube? Could someone upload it somewhere? Thanks, David -- SatSignal Software -

Re: [time-nuts] purpose of time of day display units

Two reasons that come to mind are: Displaying distributed time to distant sites from some master. Readability at a distance. > Le 22 janv. 2017 à 07:31, Ruslan Nabioullin a écrit : > > Hi, looking at pictures of various time metrology equipment setups for best >

Re: [time-nuts] Thunderbolt Harmonics

Bill, No offence taken at all. On the contrary, I really appreciate a great deal the effort you have gone to straightening out my misconceptions and blunders! This forum is such a great learning opportunity. I usually work with digital systems, so my RF and analog knowledge is sketchy at best.

[time-nuts] purpose of time of day display units

Hi, looking at pictures of various time metrology equipment setups for best practices and inspiration, I have commonly seen time of day display unit(s) installed in racks containing processing or time transfer equipment, e.g.,