Re: [time-nuts] Affordable PoE 6-digit time displays?

If you can snag something that will put out IRIG-B, there are lots of choices. I’m still hunting for something that will take NTP in and put IRIG out. There is probably someone doing it with a Pi or an Arduino. Bob > On Jun 14, 2018, at 21:38, Chris Howard wrote: > > Maybe not exactly,

Re: [time-nuts] Cheap jitter measurements

Find a nice used 5370/5371? :) There is a 5371 on ebay for $250 at the moment. On Tue, Apr 3, 2018 at 1:47 PM, Gary E. Miller wrote: > Time-nuts! > > With care I can measure GPS jitter on a RasPi to a bit over 300 nano sec > resolution. That is the smallest increment of the

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

The digispark and digispark pro are also some nice <$15 development boards that are USB programmable, use the Arduino IDE or AVR compiler, and have just enough pins to be useful. On Wed, Dec 13, 2017 at 4:34 PM, jimlux wrote: > On 12/13/17 1:28 PM, Jerry Hancock wrote: >

Re: [time-nuts] Why discipline Rubidium oscillator?

Oops cat hit ‘send’ 5071’s I’ve seen for as low as about 9k, but usually in the 15-30 range. I don’t want to know what they are new. 5061’s can be had for under $1000. If you are very lucky, under $500. And once you have the standard, you need the counters. And other analysis tools...pretty

Re: [time-nuts] Why discipline Rubidium oscillator?

Cost of a cesium clock can go from less than you pay for a pair of doxco‘s to many tens of thousands. I think 5071’s are in > On Nov 20, 2017, at 23:50, Jerry Hancock wrote: > > I read up on the GPS L1/L2 and I think there is an L5. > > And when you say “on the market” the

Re: [time-nuts] Recommendation for cheap GBIP adapter for Linux

All GPIB to Ethernet adapters are not created equal. The NI GPIB-E is no longer supported for example, only the 100 & 1000. Which is very annoying to those that have one. Bob > On Nov 18, 2017, at 17:45, Bob kb8tq wrote: > > Hi > > Given all the nonsense with USB

Re: [time-nuts] Deaf Z3801

However, setting it to 23:59:59 Dec 12,2007 and leaving t alone for an hour or two seems to have done the trick. Thanks folks! Off to look at adev/pn of the $7 GPS boards I found with 10MHz out. Plots soon. Bob On Thu, Nov 16, 2017 at 12:26 PM, Bob Bownes <bow...@gmail.com> wrote:

Re: [time-nuts] Deaf Z3801

something. > > Bob > > > On Nov 16, 2017, at 11:24 AM, Bob Bownes <bow...@gmail.com> wrote: > > > > Thanks John. > > > > When I do this, I get the E-222 error indicating 'Data out of range'. > > > > Tried several formats, trailing';', etc

Re: [time-nuts] Deaf Z3801

> > Disconnect the GPS antenna downlead > > Reapply power to the GPS receiver > > Enter *:GPS:INIT:DATE 2017,01,01* (The only space is between DATE and > 2017) > > Reconnect the GPS antenna downlead and wait > > > John > > On November 14, 2017 at 10:43

[time-nuts] Deaf Z3801

I put my 3801 back in service the day before yesterday, or tried to. It’s been on the shelf for about a year (off). I powered it up, and while it sees a few sats, it will not acquire any. Changing to a known good antenna (off the NTP server) makes no difference. Anyone seen the behavior

Re: [time-nuts] Favorite counters (current production)?

That reminds me, should anyone have a schematic for an SR 830 walking amplifier, can you please get in touch with me. I have one that keeps eating voltage regulators. > On Nov 12, 2017, at 12:12, Dr. David Kirkby (Kirkby Microwave Ltd) > wrote: > >> On 10

[time-nuts] EIP 371 counter

I’m trying to put a EIP 371 into talk only mode but have zero documentation. Anyone know how to do so so that we can characterize a few oscillators? Thanks! Bob ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Spectracom 9189 options

Folks, I've just acquired a spectracom 9189 and can see from the back that frequency, 1PPS, and IRIG were options. I presume these were add in boards, but thought I would check with you folks to see if anyone has any knowledge of the details. Thank! Bob

Re: [time-nuts] Distribution divider/amplifier for 10MHz GPSDO

Going on recollection. Now I’ll have to go look again. > On Oct 23, 2017, at 17:06, Jeremy Elson <jel...@gmail.com> wrote: > >> On Mon, Oct 23, 2017 at 1:49 PM, Bob Bownes <bow...@gmail.com> wrote: >> >> Will it work? Probably. Up to a point. >&g

Re: [time-nuts] Distribution divider/amplifier for 10MHz GPSDO

Will it work? Probably. Up to a point. Is is best practice? Not even close. Each device will (should?) generally present a 50Ω termination. In the case of instruments that provide their own ref output which is then looped back in, they may be different, but I don't recall seeing any that said

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

A black box was asked for. Who cares what the OS inside is if you never need to mess with it. A surprising number of things run linux variants. Pretty much every smart phone is linux or unix... What is the output format you would like for your timestamp? disk, network file system, serial all can

Re: [time-nuts] inexpensive, black box, GPS or NTP based TTL time capture?

So, if I hear you right, you want a ttl input to trigger a timestamp, accurate to ms or µs to a file, correct? Bob On Wed, Oct 18, 2017 at 1:33 PM, Rob Seaman wrote: > Attila Kinali wrote: > > On Wed, 18 Oct 2017 08:47:58 -0600 > > Rob Seaman https://www.febo.com/cgi-bin/ >

Re: [time-nuts] Weird GPSDO behavior

How much jitter is there in the 8am number? If industrial, I could easily see the first shift coming in and all starting up at about the same time and shutting things off one by one as the jobs finish. But I would also expect it to not show up on weekends and/or holidays, etc. Same applies for

Re: [time-nuts] Better GPS coming to phones

So when can I have an app that turns on SA for the answers from my phone? ;) > On Sep 27, 2017, at 22:38, Bill Hawkins wrote: > > Sadly, it is not the phone users who will benefit. It is the advertisers > who use your location to send targeted ads. > > Time marches on. >

[time-nuts] 5061A behavior

So I powered up my trusty 5061A a week or two ago and it's been doing something interesting. Twice now, the CA lamp has gone out, but the alarm lamp has not lit. Resetting the logic brings it right back, but this seems like an improper failure mode. The alarm lamp is fine, so that's not the

Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

Forgive my naivete, but if this is something as simple as the t'bolt adding a 10 bit number to a base date, could not the base date be changed in the PROM? (Presuming one can get to it, etc) Though I suspect that might not be all that simple of course. And I'm not taking mine apart to look. :)

[time-nuts] Of pi and ntp and irig

All the talk about building a pi with a touchscreen and NTP had me wondering when I went to the basement to pull a cable in a rack if anyone had spun up the IRIG-B code on a pi before I go and spin my wheels on it. Anyone? ___ time-nuts mailing list --

Re: [time-nuts] Power connectors continued

Keep in mind that there are a large variety of power pole connectors. I first encountered them in the cables and connectors used to recharge electric forklifts. Plenty big and can handle plenty of power. > On Jun 22, 2017, at 16:06, Chris Albertson wrote: > > I

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

; a "Cannon" connector. A good choice for that application IMHO. > > Mark Spencer > > m...@alignedsolutions.com > > > > On Jun 22, 2017, at 6:47 AM, Bob Bownes <bow...@gmail.com> wrote: > > > > Right Tool for the Job. > > > > I use barrel co

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

e PowerPoles, I like barrel connections, as with so many things it's > all about the application, choose the one that works for you. > > > >> On 22 Jun 2017 1:53 pm, "Bob Bownes" <bow...@gmail.com> wrote: >> >> Locking barrel connectors... >>

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

Locking barrel connectors... Aren't those called BNCs? ;) In one of my other lives, I see Power Poles used in a very life critical application. They are used to connect pads to Automatic External Defibrillators. In that application, the two poles (15A, red & white) are glued together rather

Re: [time-nuts] Looking for info on Trimble 16634-10

Pretty sure that connector is an off the shelf Amphenol part. If you can't find it, however, you can replace it with an off the shelf one that will fit in the same hole. (If your lucky, you can even re-use the pins.) The replacement will run you about $30-40 for the pair, chassis and plug.

Re: [time-nuts] Machining some aluminum help!

We also used helicoils in titanium frames of the supercomputer I used to work with. Meant we could use relatively standard fasteners without fear of falling. On a time nuts related note, I have a u blox GPS-1E that seems to be stuck spewing out in ublox format. With no development sw

Re: [time-nuts] Looking for a HP-58503 display

On a (slightly) related note, I have a Futaba DRO on my milling machine. The VFD display, as you mention, had grown very dark from being left on constantly. As it was a simple display with 6 7 segment digits, conversion to LED was actually pretty easy. It took about 4 hours one Sunday afternoon.

Re: [time-nuts] Line Frequeny Stablity

In college we had a Vax 11/730 that would freak out and reboot the same time every day. Turns out the culprit was the sync pulses put on the AC for synchronizing the classroom clocks...But it took DEC a few weeks to find the culprit. > On Apr 5, 2017, at 17:12, Bob kb8tq

Re: [time-nuts] Timelab, GPIB-USB-B in a VM

have to have it plugged in and enumerated first. > > Bob > > > From: Bob Bownes <bow...@gmail.com> > To: Discussion of precise time and frequency measurement <time-nuts@febo.com> > Sent: Monday, March 27, 2017 8:03 PM > Subject: Re: [time-nuts] Timelab, GPIB-

Re: [time-nuts] Timelab, GPIB-USB-B in a VM

gt; From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob > > Bownes > > Sent: Monday, March 27, 2017 2:49 PM > > To: Discussion of precise time and frequency measurement > > Subject: [time-nuts] Timelab, GPIB-USB-B in a VM > > > > So I'm trying to ru

[time-nuts] Timelab, GPIB-USB-B in a VM

So I'm trying to run timelab in a windows 7 VM with a GPIB-USB-B interface. Anyone ever tried such a thing? The NI explorer sees the interface but nothing else does. Pointers welcome! Data on a bunch of oscillators as soon as I get it to work...:) Thanks, Bob

Re: [time-nuts] Time Dilation tinkering

It's not getting one past the airport authorities that's the issue. It's getting one that's powered up past them. ;) Written from about 10,000'. :) > On Mar 22, 2017, at 20:15, Tom Van Baak wrote: > > Chris Albertson wrote: >> Why drive up a mountain? > > "Because it's

Re: [time-nuts] Antique precision timing device without electronics

Don't forget, seawater is the return path... > On Mar 17, 2017, at 18:04, Hal Murray wrote: > > > e...@scace.org said: >> Frequencies around 15 Hz were common on early 20th century cables, >> depending on the degree of success in compensating for the inherent >>

Re: [time-nuts] Bye-Bye Crystals

not to mention +/- a few hundred ppm is not a big deal. You can always correct for it in software. ;) On Tue, Mar 14, 2017 at 8:49 AM, jimlux wrote: > On 3/14/17 5:04 AM, Bob Camp wrote: > >> Hi >> >> The cost difference between a complete oscillator package and a simple

Re: [time-nuts] TTimelab question

We have a local metalworking place that will laser cut steel and Al to 3/8". For small runs (like 1), they are very competitive to simply buying the materials alone. I had them make me 3 1U panels from 3/16" steel with 12 D holes to build N patch panels. $15 ea. Powder coated in my color of

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] HP 5372A channel c option 030

While I had the 5372a apart today to replace the battery, I noticed that there is an SMA for channel C on the events board and diagram showing a cable from there to the front panel. This suggests to me that the upgrade is a cable and a key, jumper, or memory setting. Anyone ever done the

Re: [time-nuts] Line Voltage - USA

> How much trouble do hams have with their insurance companies? Typically very little if you have a rider to cover it. Costs a few $ a year Had my basement flood a number of years back and take out a few k worth of vintage computer gear. Not a problem. Covered to replacement cost. I have a

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

gt; the KO4BB site > http://www.ko4bb.com/getsimple/index.php?id=manuals > > I can post mine if that one isn't sufficient. > > Regards, John K1AE, Bolton, MA > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Bowne

[time-nuts] 5372A A7 CPU board

I have the CPU board 05372-6007 out of my 5372A this evening to replace the battery. While looking at it, I see jumpers for 64/256K and 512k/2M. I suspect the 64/256 is for the RAM as it is located next to the (non socketed) RAM. Does anyone have a schematic or listing of what all the

[time-nuts] HP 4352A/B with different signal generator

There was a thread about using a different SG with the 4352A/B about seven years ago. I happened upon the answer today. Set the SG type from the LO menu. Type 1: 8664A/B Type 2: 8657B Type 3: 8648B/C, E8241A, E8244A, E8251A, E8255A Type 4: User defined. To define your own, use the GPIB

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

Just finished creating it at groups.io *https://groups.io/g/svna * and sign up. :) On Mon, Aug 22, 2016 at 12:38 PM, Tom Miller wrote: > Maybe do it on Mewe.com? > > - Original Message - From: "Oz-in-DFW" > To:

Re: [time-nuts] Working with SMT parts.

I've got a great boom Zeiss microscope bought at an estate sale. Right Place, Right Time. Before that, I generally used a video camera with some extension tubes, a USB video capture dongle, and a spare monitor I keep on the workbench. The monitor and camera are connected with extension cables to

[time-nuts] HP 4352A

If anyone has an interest, there is at least one HP 4352A VCO/PLL analyzer left on ebay. $200 OBO. http://www.ebay.com/itm/HP-Agilent-4352A-VCO-PPL-Signal-Analyzer-Generator-Module-10MHz-3GHz-RF-4352S-/131847308679?hash=item1eb2b64587:g:95cAAOSwZJlXMrpQ The one I bought for $130 was missing the

Re: [time-nuts] Spectrum Analyzer Specifications

> Yes, good spec > ​t​ > rum analyzers usually costs more than 2000 USD even as used. Also, a "high > end" used 2000 USD spec > ​t​ > rum analyzer can be much better than brand new "entry level" 1 USD spec > ​t​ > rum > ​analyzer. And if you need any kind of vectored signal analysis, >

Re: [time-nuts] Spectrum Analyzer Specifications

Don't really need anyone who can order up bare boards in bulk anymore. Many of the board houses will make them on demand for single customers. They fit them into empty spaces in larger board orders. I'd love one if someone is willing to draw it up. I'll even put together a Mouser BOM that can be

[time-nuts] The importance of getting time right

Interesting article over on Hackaday this morning mentioning a missile defence system with time drift and the rather tragic consequences. http://hackaday.com/2015/10/22/an-improvement-to-floating-point-numbers/#more-174711 ___ time-nuts mailing list --

Re: [time-nuts] How did they distribute time in the old days?

Precise time (and time zones) and the relationship with the telegraph were a side effect of the railroads. You need to keep time (and keep on time) in order to avoid collisions on single tracked main lines. On Wed, Oct 14, 2015 at 12:42 PM, Nick Sayer via time-nuts < time-nuts@febo.com> wrote: >

Re: [time-nuts] Iridium source?

JT, You say GPS isn't available 'often'. Can you define 'often'? As in not at some locations, or as in GPS signal is only available now and then temporally? If the latter, any GPS timing unit with decent holdover should solve the issue. If the former, well, you've gotten some replies on that.

Re: [time-nuts] The low budget UT+ newbie time-nut project: FrequencyReference

Bob, I'm sure much more qualified nuts will chime in, but a few thoughts of mine. Over the years, I've collected enough GPS antennas from hamfests, online vendors and who-knows-where, all for prices from free to tens of dollars. Most of them came with anywhere from 3' to 10+meters of cable. Most

Re: [time-nuts] Beaglebone NTP server

If there is always a system running, why go with the bbb? I use the file server in the basement fed with 1pps to the non USB serial port from a TBolt in my office. You do have a file server in the basement don't you? :) I suppose it would be an interesting experiment to feed an NTP server

Re: [time-nuts] Divide by five

I'm surprised no one has suggested 74F161 or other F series. Power hungry, but rated to in excess of 100mhz, some vendors as high as 120mhz, at ordinary temps. I will have to look, but I might have a tube or two of them in the basement. I know I have most of the other 74F. On Nov 7, 2014, at

Re: [time-nuts] NPR Story I heard this morning

You people are evil. Now you have me wondering where I can get a microgram level accurate scale. Simply tracking the weight of a 'constant' (anyone got a silicon sphere with exactly 1 mole of Si atoms in it? :)) over time would be an interesting experiment. As a geologist, I also have to say,

Re: [time-nuts] NPR Story I heard this morning

But won't the doppler effect change as the Cs atoms fall down the gravity well? :) On Tue, Nov 4, 2014 at 3:14 PM, Attila Kinali att...@kinali.ch wrote: On Mon, 3 Nov 2014 11:54:41 -0800 Peter Monta pmo...@gmail.com wrote: Sorry if this is a bit off-topic. I'd like a simple, clear

Re: [time-nuts] NPR Story I heard this morning

I'd be happy to volunteer my 5061 for such an experiment! Located in Troy, N.Y., I can get it down to about 15' ASL, possibly as low as 12' if I go to the basement in a downtown building. The river is at 13' ASL iirc. Bob On Mon, Nov 3, 2014 at 4:53 PM, Tom Van Baak t...@leapsecond.com wrote:

[time-nuts] Datachron 3070

Has anyone got a manual for one of these by chance? I'd like to feed in an external oscillator but I'd like to know the frequency and amplitude before I go plugging it in at random. Thanks! Bob ___ time-nuts mailing list -- time-nuts@febo.com To

[time-nuts] 5061A SN1816A01444 lives again

Yes, Virginia, there are still a few bargains to be had in the world. After hacking together a power cord, letting it warm up for an hour or so, and going through the long power off procedure from the manual, the latest addition to my test equipment collection came to life. It arrived the other

[time-nuts] Hp 5061a power cord

Anyone know where I might find a power cord for a 5061a? Failing that, the pi out of the connector? Thanks! Bob ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] Oscilloquartz 3210 Cesium Standard

Is there a similar 'bring it back to life' procedure for the 5061A? On Thu, Aug 28, 2014 at 12:32 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote: Chris, Do you have a GPS clock? First turn the operational mode setting from off to second step (ocxo + ion pump) and let it stay there

Re: [time-nuts] Tektronix TM500 extender cable kit

I might be interested. Have you thought about making extensions for the smaller connector used to distribute GPIB in the 5000 series? On Aug 4, 2014, at 0:26, Mark Sims hol...@hotmail.com wrote: I just finished laying out a small circuit board for building an extender cable for the Tek

Re: [time-nuts] How are iPhones' clocks set under LTE?

Well, I seem to remember finding NTP running on my jail broken iPhone. But that was a few years ago. On Aug 3, 2014, at 17:41, Tim Shoppa tsho...@gmail.com wrote: Unlike CDMA (where time distribution was an automatic part of the low-level protocol) I suspect the time displayed on many

[time-nuts] Data-chron 3070 manual

Anyone have a copy of the manual for a Data-Chron 3070? It's mostly pretty obvious, bit there is a big I/O connector on the back it would be nice to know the pinout of. Thanks! Bob ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] microcontroller based IRIG generator

I remember a few discussions over the last few years about building a microcontroller (PIC, Arduino, MPS430, whatever floats your boat) based IRIG generator. Did anyone ever get one working? Thanks! Bob ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] hp 54600a and rs-232

Yup, set your program to 7E2 and test it. I would fire up a terminal program like hyperterm and see if you can talk to it manually before anything else. With only four baud rates to check, it isn't too many combinations. Not many things support split baud rates (different rate for rx and tx), but

Re: [time-nuts] A small piece on HP's hydrogen maser in 1968

Lot's of connectors change specification @ 18Ghz or are not rated bast 18Ghz. On Tue, Feb 25, 2014 at 11:55 PM, Hal Murray hmur...@megapathdsl.netwrote: jim...@earthlink.net said: there's a BIG jump in cost when you cross that 18GHz boundary line. What's magic about 18 GHz? Why not 16

Re: [time-nuts] Clock Driver Design

TV video distribution amps work very nicely. Even better if you open them up and change the matching from 75ohm to 50. :) Bob On Thu, Sep 26, 2013 at 3:19 PM, Glenn Little WB4UIV glennmaill...@bellsouth.net wrote: Would an analog video distribution amplifier work? These are available

Re: [time-nuts] NTP/1-PPS/RS232 question

in this case will move the pulse by 100MS. On Sat, Sep 7, 2013 at 9:22 PM, Bob Bownes bow...@gmail.com wrote: 100ms is an awful lot of 'inverter gates'! On Sep 7, 2013, at 23:15, Chris Albertson albertson.ch...@gmail.com wrote: With RS232 the data uses negative logic (low is 1

Re: [time-nuts] NTP/1-PPS/RS232 question

100ms is an awful lot of 'inverter gates'! On Sep 7, 2013, at 23:15, Chris Albertson albertson.ch...@gmail.com wrote: With RS232 the data uses negative logic (low is 1) and the control lines use positive logic (high is 1.) That is, a control line is asserted when it is at logic 0, a

Re: [time-nuts] SDR Radio Opinion ?

They also make nice panadapters... On Aug 5, 2013, at 17:25, Lizeth Norman normanliz...@gmail.com wrote: Gents, These things are limited in usefulness by themselves. They need decent filtering and preamps for any weak signal stuff. If all you want to do receive the local channels, then these

Re: [time-nuts] Good (cheap) PIC chip choice for project?

I suspect Linux based systems are a few sigma away from the original goal of a cheap pic choice...:) But to get back to the original point, you can get samples of most of the PIC chips from MicroChip for free. I think the limit is 3 per week. Or 30 days, I don't remember. Bob On May 25,

Re: [time-nuts] Time Nut Pickens at the MIT Flea ?

We should plan a Time-Nuts BOF lunch after the next flea. Saw little TN gear @ Dayton save one Efretom RBI time base for $1800 and a few 10811s of dubious quality for $50 ea. the dents put me off gambling on one since I was given or the afternoon before! ;) On May 19, 2013, at 21:50, paul

Re: [time-nuts] Needed: The Real Serial USB Fix

There are some well documented issues with timing and USB that have been rehashed here a few times. On Sun, Jan 27, 2013 at 1:48 PM, Jim Lux jim...@earthlink.net wrote: On 1/27/13 9:30 AM, Peter Gottlieb wrote: At work we simply use multi port serial cards (*no* USB intermediary) or

Re: [time-nuts] 10 MHz - 16 MHz clock multiplier

Paul Wade built a board recently to do just this. www.w1ghz.org. Bob On Fri, Jan 4, 2013 at 12:16 PM, Chris Albertson albertson.ch...@gmail.comwrote: THis is exactly what they are talking about the 74HC390 can do over 50MHz and costs abut 30 cents. You don't need ECL or anything so exotic

Re: [time-nuts] Tracking NTP displacement and correlation betweentwo clients.

David, The problem is that they start in sync and over the course of a day drift that far apart despite having NTP running. We're not sure why NTP isn't correcting it along the way. Though at this point, we are looking at a firmware bug. Thanks! Bob On Oct 5, 2012, at 12:30 AM, David J Taylor

Re: [time-nuts] Tracking NTP displacement and correlation between two clients.

On Thu, Oct 4, 2012 at 12:46 PM, Hal Murray hmur...@megapathdsl.net wrote: bow...@gmail.com said: Due to reasons I really can't go into, a systems user is concerned with the displacement of two servers from the same pair of stratum 2 NTP servers. redacted Assuming you are running the

Re: [time-nuts] Tracking NTP displacement and correlation between two clients.

On Thu, Oct 4, 2012 at 1:31 PM, Attila Kinali att...@kinali.ch wrote: On Thu, 4 Oct 2012 13:04:27 -0400 Bob Bownes bow...@gmail.com wrote: The problem stems from one of the two (identical) machines drifting off by 60-70 seconds per day. So a few ms here and there are ok. Is it drifting

Re: [time-nuts] Lady Heather on a Laptop

I run an XP VM in either VirtualBox (under linux) or Parallels (on my mac) to do the same thing. Works like a charm. Bob On Thu, Sep 27, 2012 at 11:00 AM, paul swed paulsw...@gmail.com wrote: My I like your approach. Now I have to go see what all of this might cost. On vmware are you

Re: [time-nuts] Javad's J-Shield

It isn't an article. It's an 11 page ad. Notice there are no magazine page footers and the formatting is not the same as articles. Most 'reputable' publications would now put 'Advertisement' at the bottom of each page. Bob On Fri, Sep 21, 2012 at 9:35 AM, Rob Kimberley

Re: [time-nuts] Reducing lab noise with LED lighting.

AllElectronics has has some ~24, 24 white LED white strips available for about $7 of late. I purchased a bunch and stick them under the lips of the shelves in my office/lab and powered them with an old laptop brick I had sitting about. Look great, wickedly cheap, and very effective, especially at

Re: [time-nuts] web presentation of data

If you are looking to graph long running data and provide rolled up summaries, the combination of MRTG and RRDtool is pretty hard to beat. Can work with pretty much anything on the back end. And it's the industry standard for network monitoring. http://oss.oetiker.ch/mrtg/doc/mrtg.en.html Or

Re: [time-nuts] Cables dor 10 mHz

Old ThinNet was coax, as was ThickNet before it. Only in the Modern Age have they been using twisted pair. :) On Mon, Jul 30, 2012 at 3:41 PM, Sylvain Munaut 246...@gmail.com wrote: 10 mHz Please use MHz ... 10 mHz is 10 milli-hertz, ie 1 cycle every 10 second. An yes, ethernet not

Re: [time-nuts] Trimble T Lassen 2 - suitableantenna....advice.....questions

The pulse from my T-Bolt is on the order of 1uS wide. I captured it on the digital scope for posterity and future reference. http://www.fastbobs.com/pictures/1pps.jpg Bob On Mon, Jul 23, 2012 at 12:58 PM, Chris Albertson albertson.ch...@gmail.com wrote: I wass fooled by this too. My analog

Re: [time-nuts] [OT] Paywall Rant (was Re: Spoofing GPS)

The fact that a clause is not enforceable doesn't prevent it from being put in contracts to scare non lawyers. I had my personal attorney, who happens to work for a firm that has another atty that specializes in employee/union side labor law, review one of my employment contracts once. His opinion

Re: [time-nuts] Serial port server .. any interest in a write up onusing ?

I use the lantronix serial to ethernet converters and I use Xylogix terminal servers. I've not had much luck getting either to work with classic windows based applications, though I'd love to do so as I have a plethora of both. I use a 64 port xylogix in the basement to connect to all the serial

Re: [time-nuts] Serial port server .. any interest in a write up on using ?

I buy them on ebay. Usually $30+SH for 32 ports. 64 port units are harder to find as are self booting units. (Most xylogics boot from the network, which is easy enough to make work) On Tue, May 22, 2012 at 11:46 AM, Chris Albertson albertson.ch...@gmail.com wrote: Terminal servers are

Re: [time-nuts] Chinese Scopes (was: Re: LORAN-C at MIT)

You know, I have a 1Gig Tek digital (DSA602 with 11A72/11A71,11A34) on my bench and a 1G Tek analog (7934). The 7934 never gets fired up anymore. I really should reclaim the space. On Mon, Apr 16, 2012 at 11:41 AM, Tom Knox act...@hotmail.com wrote: I was speaking several years ago to someone

Re: [time-nuts] Best location for a GPS antenna...?

I do like the optical isolation suggestion. While less than optimal, perhaps the easiest solution is not to put the isolation between the t'bolt and the antenna, but to put the isolation between the t'bolt and the distribution amplifier. For example, locate the antenna as suggested. Locate the

Re: [time-nuts] Best location for a GPS antenna...?

Don't forget to tighten the fiber connectors and correct for the length of the fiber or you'll be off by 60ns! ;) On Wed, Apr 11, 2012 at 1:17 PM, Chris Albertson albertson.ch...@gmail.comwrote: On Wed, Apr 11, 2012 at 7:19 AM, Bob Bownes bow...@gmail.com wrote: The issue

Re: [time-nuts] Best location for a GPS antenna...?

I suspect that would make the multipath problem even worse. On Wed, Apr 11, 2012 at 4:06 PM, Andrea Baldoni erm1ea...@ermione.comwrote: On Wed, Apr 11, 2012 at 10:19:40AM -0400, Bob Bownes wrote: I do like the optical isolation suggestion. While less than optimal, perhaps the easiest

Re: [time-nuts] 0MHz distribution...NOT

What, if any, are the phase changes? On Mon, Mar 12, 2012 at 5:39 PM, Chuck Forsberg WA7KGX N2469R c...@omen.comwrote: On 03/10/2012 04:44 PM, Mark Spencer wrote: I've done this as well. I daisy chained several pieces of hp and marconi gear together that all had an approx 1k ohm input

[time-nuts] 5061's on ebay

There are 3 5061's listed on ebay at the moment. Anyone know anything about them? ___ 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 instructions there.

Re: [time-nuts] Low-long-term-drift clock for board level integration?

Think trying to measure the distance between two distant moving spacecraft with no idea what the gravitational gradient is between them or the ability to measure the doppler. Unless, of course, Bill is doing much different things than he was when I last ran into him. :) On Mon, Feb 20, 2012 at

[time-nuts] Tek to HP conversion... Was: Re: Fwd: FE-5680A Contact FEI

I was a Tek aficionado for many many years. My first personal scope was a tek, my first work scope was a Tek. I've owned at least half a dozen over the decades. The three scopes I own today are Tek. But everything else on my lab bench has changed over to HP (with the exception of a couple of

Re: [time-nuts] FE-5680A 1 pps photo

Just for completeness sake, here is a screen capture off of my DSA-602 of the 1pps. Note that the trace starts 500ns _before_ the 1pps triggers the capture. Ah the wonders of digital sampling. http://www.fastbobs.com/pictures/1pps.jpg Also as a pdf http://www.fastbobs.com/pictures/1pps.pdf

Re: [time-nuts] TM 5680-0211 for 5680A series Rubidiums

If someone sends me the manual, I have a location I can host it. Bob On Wed, Feb 1, 2012 at 12:38 PM, Larry McDavid lmcda...@lmceng.com wrote: I wish Rob Kimberley's email address had been preserved so I could also ask for this manual pdf file without adding traffic to TimeNuts. Chris

[time-nuts] Determination of the placement of the first pps

As I am, as Heinlein would say, but an egg in terms of time-nuttery, perhaps someone could point me toward some history in order to help answer a question recently posed to me. At what point was the original global 1pps leading (trailing?) edge defined/distributed and to what was (is) it

[time-nuts] 5370A on ebay

if anyone is looking for a 5370, there is one on ebay that is currently listed for $29+shipping... http://www.ebay.com/itm/HP-Agilent-5370A-Universal-Time-Interval-Counter-/160714650831?pt=LH_DefaultDomain_0hash=item256b56f4cf No financial interest, but that's a lot less than I paid for mine! ;)

Re: [time-nuts] GPS interference and history...

When you are thinking about replacing GPS receivers, don't forget about every police car, ambulance, fire truck and most of the tractor trailer's in the US...The latter don't need timing down to the second, but the first three use it to well under a minute. One of the first things you learn when

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