Re: [time-nuts] GPSDO Crystal Aging

Interesting idea. It might be an interesting experiment to couple a large number of inexpensive xtals to see how it impacts effects such as sudden changes in a single xtal. With sufficient monitoring of each one, you could even tune the coupling to amplify/attenuate the results of the 'good'

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

Framing error or override sounds like a parity or stop bit issues. Have you changed those at all? 7E2 often works when 8N1 is specified. On Apr 22, 2014, at 10:34, Collins, Graham coll...@navcanada.ca wrote: Thank you Thomas, I have that document but it wasn't of much help. I spent much

Re: [time-nuts] GPSDO standard interface?

Well, I built one of the ve2zaz units, and it has a. Pretty well defined serial interface. On the other hand, the one I use most has a PIC and an LCD, no serial interface. On Jun 25, 2014, at 20:10, Bob Stewart b...@evoria.net wrote: In an offline communication, I suddenly realized that I

Re: [time-nuts] Time Code Units Available

Walter, If the two datachron units and the datum 9300 are still available, I would be most interested. Thanks! Bob On Jul 8, 2014, at 17:08, walter shawlee 2 walt...@sphere.bc.ca wrote: (very sorry for the first file size! Here's a smaller one) Since there were several requests for

[time-nuts] MIT Flea

Apologies for to those not in New England or not going to the Flea. I'm heading out to the MIT Flea at oh-freaking-dark in the morning and I know there are often several time nuts who go. If you happen to see a guy wander by in a Horton Emergency Vehicles hat looking very tired, say Hi!

Re: [time-nuts] Oscilloquartz 3210 Cesium Standard

Careful Chris, it sounds like you are developing the symptoms of the Vintage strain of the time nuts infection. Next thing you know, you will be looking at tall clocks. Bob, who is debating the wisdom of non invasively synchronizing the family heirloom tall clock to the new cesium clock...

Re: [time-nuts] 5370 processor boards available

At that point, why not just remove the few remaining HP parts and put them in a new enclosure? :) On Oct 8, 2014, at 10:29, Pete Lancashire p...@petelancashire.com wrote: One future project would be to replace the front panel with a LCD/Touch Panel On Wed, Oct 8, 2014 at 6:56 AM,

Re: [time-nuts] 10811's

Is there a quick and dirty summary of which are the good 10811's? Otherwise, I clearly need to go through my collection and characterize them! :) I should probably do that anyway... On Nov 17, 2014, at 21:50, Bob Camp kb...@n1k.org wrote: Hi As best anybody can tell, the improved phase

Re: [time-nuts] GPS in the news

I read the article and thought it would make for an interesting crowd sourced project if the sensitivity is large enough to build a distributed sensor network with GPSDOs. On Nov 18, 2014, at 17:15, Magnus Danielson mag...@rubidium.dyndns.org wrote: Hi Charles and Joe, Read this,

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

Comments inline. On Oct 5, 2012, at 18:26, Hal Murray hmur...@megapathdsl.net wrote: bow...@gmail.com said: 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.

Re: [time-nuts] Antique 5061A option 004

Boy am I glad I didn't go to either! On Oct 15, 2012, at 17:30, David I. Emery d...@dieconsulting.com wrote: In a mad moment at the NEARFest flea this weekend I grabbed a 5061A for $250. Poor thing was getting wet in the rain and needed a home. Really really heavy to carry to the car,

Re: [time-nuts] RasberryPi, timing and GPS receivers

By the way, you need not use a USB serial adapter. Several folks are doing PPS on the gpio pins. Take a look here https://github.com/davidk/adafruit-raspberrypi-linux-pps And here http://www.frambozenbier.org/index.php/raspi-community-news/4439-george-lu-on-ntp-pps On Oct 16, 2012, at

Re: [time-nuts] Nifty MINI TIC for DMTD work

+1 please! On Nov 19, 2012, at 16:23, mcqu...@sonic.net wrote: MINI-TIC for DMTD work Hi Everyone! I've been testing a Miniature 2 channel TIC that Bert Kehren and Juerg Koegel and Richard Mc Corkle have designed. Please add my name to the list! Thank you, Dave

Re: [time-nuts] EIP545A 18GHz counter query

You can also overdrive a mmic and get good results. That is what I'm using as the oscillator for my 1.296 GHz beacon. Bob On Nov 27, 2012, at 15:45, Ed Palmer ed_pal...@sasktel.net wrote: Hi Don, Yes, I've heard of SRDs. I think every Rb standard uses them. I recently purchased a YIG

Re: [time-nuts] Using a frequency synthesizer replacement for motherboard oscillator

It all depends on what clock your talking about. Any given PC probably has more than one oscillator onboard. Generally there will be one for the CPU, one for the display circuitry, and probably one for the real time clock. Presuming you are talking about the CPU clock, it should be fairly

Re: [time-nuts] GPS DO Alternatives

I've only been following this thread distantly, however, I have been playing with arduinos quite a bit of late. If you wanted to incorporate one as the processor of choice in a new design, the cost is quite low, under $4.00us for the processor in quantity one. I've used one in a new design in

Re: [time-nuts] Z3801A trouble

That is exactly what mine does when it has marginal power on the 48v input. You may find that 50-52vdc works. On Jan 13, 2013, at 0:14, Joseph Gray jg...@zianet.com wrote: After many years of faithful service, my Z3801A has stopped working. It seems to be going through a loop at powerup. All

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

The problem with the Ethernet adapters is the lack of software support on the OS side. I'd have gone to that long ago if I could point any bit if software at a serial port that was actually on a terminal server out on the ip fabric. On Jan 27, 2013, at 12:30, Peter Gottlieb n...@verizon.net

Re: [time-nuts] Nifty MINI TIC for DMTD

Used is definitely the way to go. My stereo zoom scope was $15! On Feb 8, 2013, at 16:12, DaveH i...@blackmountainforge.com wrote: Check to see if there are any tech auctions in your area. Picked up a nice scope with stand and illuminator for $90 in the Seattle area. Dave

Re: [time-nuts] OT - DC-10 gyros

On Mar 27, 2013, at 22:54, Jim Lux jim...@earthlink.net wrote: On 3/27/13 3:20 PM, Bob Camp wrote: Of course, for the more mechanically inclined.. what about a big flywheel driving an alternator. You might be able to rejigger a car alternator. I don't recall how many poles they

Re: [time-nuts] apple Xcode

Oh, you can do it, but you really need to know what you're doing. As the prev poster said, it depends on what you are doing. Simple compiles are straightforward, autoconf if its a bit more complex, use Xcode. If you are doing work on an app that needs a GUI, Xcode makes it easy. On May 20,

Re: [time-nuts] Follow-up question re: microcontroller families

I use the Arduino as a rapid prototype development platform. I build the application and the hardware on the Arduino and then move the cpu to a standalone board. You can also use the Arduino as a programmer much like someone else suggested. Bob On May 26, 2013, at 13:19, Chris Albertson

Re: [time-nuts] Follow-up question re: microcontroller families

For making a blinking LEDs, it is hard to beat a 74LS74. However, a PIC, is probably less expensive! :) On May 26, 2013, at 13:33, Bob Camp li...@rtty.us wrote: Hi If you head over to the auction sites and do a bit of creative digging / bidding, the Arduino clones are amazingly cheap.

Re: [time-nuts] Capacitor failures

A fine and accurate observation. I've been slowly replacing the loud 110v fans in my test equipment with new, higher cfm, quiet 12 vdc fans that probably won't last as long but make it possible to hear in my workshop. On Oct 21, 2010, at 11:59 PM, Perry Sandeen sandee...@yahoo.com wrote:

Re: [time-nuts] [OT} audiophile outlets.....

And there is your product. The GPSDO derived 44.1 kHz reference! I only ask for a 10% royalty.:) On Jun 19, 2013, at 20:54, Tom Knox act...@hotmail.com wrote: I wonder what is the best way to obtain 44.1KHz from a 5-10MHz reference. Thomas Knox Date: Wed, 19 Jun 2013 15:14:17 -0600

Re: [time-nuts] fast edge, rise time.

There are some good alternatives to krytrons. Just don't expect to be able to afford or export them. ;) On Dec 26, 2013, at 21:26, Bob Camp li...@rtty.us wrote: Hi Unless you want run for 1 second, that rules out a Krytron. Length of operation also impacts some of the other

Re: [time-nuts] LORAN-C at MIT

Yup. Once a month. Good sized parking lot plus four or five floors of a parking garage. Sounds like there were enough T-N there to have had a gathering! :) I too looked at all the loran units and decided to pass. III On Apr 15, 2012, at 17:45, Don Latham d...@montana.com wrote: Oh, I

Re: [time-nuts] GPS, USGS Early Earthquake Warning

WIWAUG (when I was an under grad), it was explained to me that the seismometers were log scale and basically don't clip. When you get into a big event, the last few decimal places just don't matter. We also used differential GPS across known fault lines to measure slip both over time and

Re: [time-nuts] US 5065A standby battery cell source?

I get my tabbed batteries from Batteries America. Decent prices and good quality. On Jul 1, 2012, at 19:41, Dan Rae dan...@verizon.net wrote: All this discussion of the excellence of these Rb units reminds me that another cell must have died in my battery pack since the slightest glitch

Re: [time-nuts] [OT]: HP-5061A and a dust bunny.....

I understand this event perfectly. Our feline owners leave us presents on an occasional basis. Usually we find them straight away, but when we can't, ninja nose wife takes over. For some reason, however, they tend to only leave the back half of the dead rabbit. My spouse says it is because

Re: [time-nuts] Thunderbolt mounting

I've oft considered bolting one to the cement wall in my basement, which is a very nice, very stable 57deg F just to see how it holds. On Jul 13, 2012, at 14:36, Don Latham d...@montana.com wrote: You can get one of these at any large truck stop :-) Don Peter Gottlieb Now I suppose

Re: [time-nuts] Thunderbolt mounting

As someone pointed out, it is dependent on where you are, as well as a number of other factors. I've got a nice chunk of concrete tied to bedrock about 10' below the surface with a thermal variation that is below the threshold of the thermometer i have there. Since I need to put something

Re: [time-nuts] Lightsquared questionfor SFO area....

Interesting that they use jammers. The guys on the ambulances just wrap the antennas with the foil from burger wrappers or the like. On Jul 28, 2012, at 0:34, Jim Lux jim...@earthlink.net wrote: On 7/27/12 6:42 PM, Brian, WA1ZMS wrote: Does anyone know if there is ANY recent active

Re: [time-nuts] Cables dor 10 mHz

Not only do i remember the frozen yellow hose, I still have my vampire tap drill/tool...now finding it may be another matter...:) On Jul 30, 2012, at 18:53, Chris Albertson albertson.ch...@gmail.com wrote: On Mon, Jul 30, 2012 at 12:41 PM, Sylvain Munaut 246...@gmail.com wrote: 10 mHz

Re: [time-nuts] Modern motherboard with RS232 port

Why not just use a raspberry pi? Uses a whole 2w at idle. Ntp might bump that to 2.01. On Aug 19, 2012, at 13:06, Chris Albertson albertson.ch...@gmail.com wrote: This sounds like a newer version of the board I use. The thing to check is if the CPU heat sink has a fan or not.

Re: [time-nuts] Modern motherboard with RS232 port

counters like on a 45xx board. You also don't have a well tuned ntp since it's LInux. Bob On Aug 19, 2012, at 1:31 PM, Chris Albertson albertson.ch...@gmail.com wrote: On Sun, Aug 19, 2012 at 10:16 AM, bownes bow...@gmail.com wrote: Why not just use a raspberry pi? Uses a whole 2w at idle

Re: [time-nuts] Modern motherboard with RS232 port

Agreed. Just pointing out there isn't a big porting effort to get ntpd itself up and running. On Aug 19, 2012, at 22:24, Chris Albertson albertson.ch...@gmail.com wrote: On Sun, Aug 19, 2012 at 6:49 PM, bownes bow...@gmail.com wrote: It comes w ntp out of the box if you run fedora

Re: [time-nuts] Hi Power LED Light power supply...

The local sandwich shop that I frequent recently switched to LED lighting. When I walk up to the counter I can see the flicker when people's hands are moving. The same applies for LED taillights when a vehicle is moving as well as newer LED tower lighting. Bob On Sep 18, 2012, at 13:15, Hal

Re: [time-nuts] GPS Jammer

Many folks. The paranoid tinfoil hat crowd Folks who are concerned that law enforcement has placed a GPS tracker on their car. Truckers avoiding log enforcement Truckers who want to sleep rather than drive. Ambulance drivers who want to sleep but claim to have been held up at hospital.

Re: [time-nuts] OT question about liquid cooling

BWIWY (back when I was young) we needed a dummy load for a supercomputer (think Cray YMP size) that drew many many kw. Our test load was about 250' of 3/4 copper tubing coiled at about 12 dia and 1 spacing. The load was varied by changing where the + and - leads were bolted onto the coil with

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

It had to happen eventually. Time Nut interest overlapped with $DAY_JOB. 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. I'm convinced that it really isn an issue as long as the two systems

Re: [time-nuts] Defective Z3801 and strange PS board

My educated guess is that they expected to sell these to telcos, who traditionally run everything in a central office on -48v and running off of ac was an afterthought. On Jul 9, 2011, at 9:43, Marco IK1ODO ik1...@spin-it.com wrote: Hello group, after many years (about 12, I think) of

Re: [time-nuts] Am I the only Time Nut who doesn't wear a watch?

I'd love to find a Smiths analogue clock to match the gauges in the dash of my old British car! On Jul 16, 2011, at 10:56, Michael Poulos poulo...@gmail.com wrote: On 7/10/2011 5:04 AM, Javier Herrero wrote: My car has an interior look similar to this:

Re: [time-nuts] time-nuts Digest, Vol 89, Issue 51

Those bolts would be whitworth. On Dec 15, 2011, at 14:43, Steve . iteratio...@gmail.com wrote: The laboratory where i work obviously reports results using the SI metric system. There is one exception though, and that is the energy side, specifically calorimetry. At first glance the

Re: [time-nuts] line frequency website

Imagine a 3d map in which colour represents phase or frequency and Z displacement of the sample point represents voltage. Would make for a nice animation anyway. On Dec 30, 2011, at 17:47, shali...@gmail.com wrote: The problem is that while the frequency is going to be pretty much the

Re: [time-nuts] Speaking of shipments from China

It is one of those cost/benefit calculations. The cost of sorting the real gifts from the commerce $100 labeled as gift probably wouldn't pay for itself. It is, of course illegal. The question is are we better off changing the enforcement or the law. Not to mention the cost of the latter.

Re: [time-nuts] Getting my Rockwell D200 GPS to work

Step one...is the antenna in a location where it can see they sky? Sorry if it is a stupid question but you already said it was plugged in. :) On Jan 6, 2012, at 19:24, Don Lewis dlewis6...@austin.rr.com wrote: Can someone please give me some pointers (my first time with a GPS module).

Re: [time-nuts] Getting my Rockwell D200 GPS to work

-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of bownes Sent: Friday, January 06, 2012 6:49 PM To: Discussion of precise time and frequency measurement Cc: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Getting my Rockwell D200 GPS to work

Re: [time-nuts] FE-5680A Mechanical Question

On Jan 13, 2012, at 17:51, Chris Albertson albertson.ch...@gmail.com wrote: I'm surprised that no one has built a GPIB controller from a uP. Electrically the GPIB is simple and slow by modern standards. Several have. That is basically what the prologix is. There is another one you

Re: [time-nuts] nanoseconds in the news

There was a system in NJ with over 3000 ps2s in a supercomputer config. The financial industry's idea of high cost is a bit different than most. The price of your real time ticker feed from the exchanges is directly proportional to the associated network latency due to speed of light. Bob

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

Yup. Between the 1ghz 7000 series, the DSA602 w 1Ghz plug ins, and the 2236 portable I don't expect I'll ever need to buy another scope. On Feb 17, 2012, at 16:36, J. Forster j...@quikus.com wrote: Tek went into the toilet when Danaher bought them out. I bought a TDS1002 and could not

Re: [time-nuts] Z3801A......????

an offer and it's yours after I get time to test is out. -Brian, WA1ZMS On Feb 17, 2012, at 4:56 PM, bownes bow...@gmail.com wrote: ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman

Re: [time-nuts] How best to exchange Large files?

Wow. I just save it to an nfs share on the NAS. Then I can get to it from anywhere in the house/world... Have not seen anyone use kermit or zmodem orsplit or rar or uuencode for a long long time. On Feb 21, 2012, at 18:59, Chris Albertson albertson.ch...@gmail.com wrote: On Tue, Feb 21,

Re: [time-nuts] Maintaining boatanchors (was Capacitor Failures)

Don't forget to scare up the appropriate programmer. Those are getting hard to come by too. On Oct 22, 2010, at 7:02 PM, Chuck Harris cfhar...@erols.com wrote: I don't believe the parts are failing due to structural problems, but rather are just leaking down their buried charge. It

Re: [time-nuts] Maintaining boatanchors (was Capacitor Failures)

If you are going to worry about things at that level, then it is not just the memory devices, you'll be worrying about all the programmable parts such as PALs, GALs, and other eplds. Then you are really looking fort some exotic programmers. Ironically, I bought a standalone programmer many

Re: [time-nuts] Maintaining boatanchors (was Capacitor Failures)

Precicesly why I have a basement shelf or two dedicated to old datebooks. :) On Oct 23, 2010, at 12:44 AM, Hal Murray hmur...@megapathdsl.net wrote: ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Maintaining boatanchors

This makes me re-think arguing with my wife about tossing the 15 linear feet of three ring binders full of systems documentation sitting in the basement. But not for long. I'll keep what I don't have electronically I guess, but the SunOS 2.2 manual set can totally go in the trash. The field

Re: [time-nuts] Linux timekeeping / jiffy source

Unfortunately, there is no way to restart the kernel without going through a BIOS re initialization. Changing the run level restarts the init process but does not reload the kernel. On Dec 2, 2010, at 10:17 PM, mi...@flatsurface.com (Mike S) wrote: Anyone familiar with Linux kernel

Re: [time-nuts] Linux timekeeping / jiffy source

Thanks for the correction/education! On Dec 3, 2010, at 2:17 AM, Christian Vogel vogel...@vogel.cx wrote: Hi bownes, Unfortunately, there is no way to restart the kernel without going through a BIOS re initialization. actually, there is. It's called kexec. See, for example http

Re: [time-nuts] Frequency counter recommendation

For me, at least, the purpose is twofold, to learn, and to get a better instrument. The idea of being able to discriminate between two inputs a few ps apart is fascinating and something I'd like to learn how it is done. The VNA is a good comparison. I have a nice scalar nw but would like a

Re: [time-nuts] Frequency counter recommendation

That's kinda my point about using rs232. Serial to USB, serial to Ethernet adaptors will be available for a good long while. Also why I like the idea of a standalone instrument that also has a pc interface of some sort. Or a slot for a pc interface of whatever source I want. So how does

Re: [time-nuts] Form factor

I love those Hammond boxes until I have to pay the bill. The one for my n2pk VNA was about $28. But one of those as the primary enclosure with input boards and output boards that plug into a main board would be feasable if a tad expensive. Some modules lend themselves to plugins on a main

Re: [time-nuts] Form factor

That would all depend upon the interconnect strategy, which hasn't reached consensus either. Based on the early module list, a bus probably isn't necessary, and individual ribbon cable and/or coax will do if speeds stay low. On Dec 21, 2010, at 2:34 PM, Bruce Griffiths

Re: [time-nuts] Large Qty HP C-Beam Tubes available

Greg, I'm going to be in the area next month and might be able to pick some up and redistribute them if that is of any assistance. If I can end up with a clock somehow, I'd be interested in that too. Bob On Jan 15, 2011, at 12:33 PM, J. Forster j...@quik.com wrote: I doubt the shipping

Re: [time-nuts] From GPS World - Lightsquared has been given the goahead

Of the 2 lc orgs I administer or am a member of, and the roughly 8 other lc orgs I interact with on a regular basis, only one uses lc certified gps equip. The others are all consumer grade or don't use gps. However, a slew of filings and letters from the lc community might not be a bad

Re: [time-nuts] From GPS World - Lightsquared has been given the goahead

Sorry. Life critical. Fire, ems, law enforcement, aviation, etc. On Feb 2, 2011, at 3:37 PM, Rex r...@sonic.net wrote: On 2/2/2011 2:29 PM, bownes wrote: Of the 2 lc orgs I administer or am a member of, and the roughly 8 other lc orgs I interact with on a regular basis, only one uses lc

Re: [time-nuts] time-nuts Digest, Vol 79, Issue 31

I've not seen 110v fans in 'ultraquiet'. On Feb 10, 2011, at 11:37 PM, Rick Karlquist rich...@karlquist.com wrote: It isn't clear why you need to change to 12V fans. Why not modern 120V fans? Rick ___ time-nuts mailing list --

Re: [time-nuts] Enclosure for Thunderbolt

James, I used an old 1 u server case and it's accompanying power supply. The back panel was already punched for a db9. All I had to do was drill some holes for BNC output and sma for the antenna connector. The big win was the 2x16 backlit LCD panel on the front which I hooked up to a monitor

Re: [time-nuts] T.I. experimenting - newbie question

Another interesting measurement would be to use the timebase output and external reference to compare the readings using the same timebase. Or are you already using a gpsdo? On Apr 5, 2011, at 12:08 AM, Joseph Gray jg...@zianet.com wrote: I'm keeping the newbie question in the subject for

Re: [time-nuts] Selecting a used HP sweep/frequency generator

the advice. Another question follows in a new post, so as not to hijack this one. ;) Bob On Apr 14, 2011, at 10:07 PM, Gary Chatters gcarlis...@garychatters.com wrote: On 04/14/2011 02:03 PM, Poul-Henning Kamp wrote: In messageBANLkTi=upy4x2wumn9rpaw-vreu4yw3...@mail.gmail.com, Bob Bownes wri

Re: [time-nuts] USB and Mouse conflict persists

I have this problem as well. The issue is that the USB com port shows up as a different number sometimes after a reboot and thus I must go in and manually disable the 'mouse' again. Quite annoying when trying to set up a system that just boots up and works. On May 11, 2011, at 9:51, brent

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

That small hemispherical antenna could also have been 900mhz. I have one here @ home that is a combined gps/900mhz antenna from an ambulance tracking system. On Jun 10, 2011, at 22:01, Hal Murray hmur...@megapathdsl.net wrote: li...@rtty.us said: There's an enormous amount of gear out

Re: [time-nuts] Set time on Solaris computer from HP 58503A

On Dec 14, 2014, at 07:42, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: On 14 December 2014 at 11:57, Hal Murray hmur...@megapathdsl.net redacted That command works. How do you reboot - apart from of course powering the thing off? # shutdown -y

[time-nuts] HP Agilent 5061A Cesium Beam Frequency Standard

If anyone happens to be looking for a 5061A in the Bay Area this might be a good deal. Bob View item: HP Agilent 5061A Cesium Beam Frequency Standard End Time: Feb 20, 2015, 18:32:56 EST ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Thunderbolt/Arduino RS232 Interface Issue

Swap the tx and rx lines on the Arduino. Swap back to reconnect to PC. On Jun 3, 2015, at 10:51, Chris Albertson albertson.ch...@gmail.com wrote: In the RS-232 world devices are either DTE or DCE. You need one of each on each end of the line if using a normal straight cable.To

Re: [time-nuts] KS-24361 NO GPS - again

Typically the pins are two or three lengths. The longest pins are ground, the next are power, then signal pins. Quite often used for things that are hot swapped. Take a look at a USB cable for example. On May 29, 2015, at 19:01, Chuck Harris cfhar...@erols.com wrote: Thees units were

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

And to tie this back to the UPS thread, at university, the Simplex clock sync signal made our Vax 11/730 TOD clock run wy fast. I never figured out if it was using line frequency zero crossings for seconds or if it was leaking as DEC fixed it not long after it was installed. (And it was

[time-nuts] HP 4352A

I just asked over on the HP equipment list, but time nuts had a thread on the 4352 a while back... Has anyone got a service manual for the 4352A? The B version is out there in the wild, but the A version seems to have gone MIA. Additionally, should anyone have either a 11636B power divider

[time-nuts] Datum 105242-001 pinout

My Google fu is weak tonight. I'm out in the field getting ready for the ARRL VHF/UHF contest. Thought I'd bring along the bits for my 10GHz transverter and assemble it during the downtime. But I'm being thwarted. Does anyone have the pinout for the six pin Datum 10Mhz oscillators?

Re: [time-nuts] OT stuffing boards: was GPS interface/prototyping

Aside from using the toaster oven reflow controller from SparkFun? > On Jun 23, 2016, at 21:28, Jay Grizzard wrote: > >> On Thu, Jun 23, 2016 at 11:28:00PM +, Mark Sims wrote: >> A usable re-flow oven can be had for $300. > > Do you (or anyone) have

Re: [time-nuts] New Member + Basic Questions

The 8640 will lock to an external 5Mhz reference. That's what the BNC in the heatsink is for. At least that is where it is on mine. The trick is doing a good divide by two. However, that said, the 8640 tops out at ~1024MHz, which if you get interested in even the lower microwaves, is not

Re: [time-nuts] pick and place problems/design (was: OT stuffing boards)

And try to tell transistor A from transistor B from diode C when they are all upside down. A moving head design can be made to pick up parts off of reels on all four sides. But it takes more table space. Which is money. As someone else said, you need Z rotation, which isn't as easy as it

Re: [time-nuts] HP 5372A advice

Has anyone published a summary of the differences between the '71 & '72? > On Jan 20, 2016, at 15:11, Poul-Henning Kamp wrote: > > > In message <569fde69.2020...@rubidium.dyndns.org>, Magnus Danielson writes: > >> Good, then I have not remembered completely

Re: [time-nuts] Fast risetime pulse generator

Maybe a krytron? If you are able to get one anyway. ;) > On Apr 13, 2016, at 18:32, David wrote: > >> On Wed, 13 Apr 2016 00:03:03 -0500, you wrote: >> >> ... >> >> If you are building up something, you probably want a SRD (step >> recovery diode) or tunnel diode. But

[time-nuts] MIT Flea & HP 5328

Apologies to those not in or around Boston tomorrow. You can ignore this msg. I'll be at the flea tomorrow selling off a 5328 with 10811 OXCO & 15GHz prescaler and a few other goodies. I seem to recall that there are generally a few of us in attendance. Perhaps we could have an impromptu

Re: [time-nuts] RG6 or LMR400 for GPS Antenna (Symmetricom 58532A and T-bolt)

N connectors should never need to 'lubed'. Properly assembled they are waterproof. Same goes for BNC. That's what the rubber gasket on the mating surface is for. Metrology grade Ns don't have the gasket but you shouldn't need it on your metrology bench. :) That being said, it never hurts to

Re: [time-nuts] [LEAPSECS] Leap second to be introduced at midnight UTC December 31 this year

We've been dealing with speed of light issues for over 20 years in the financial world. And telecom. Someone recently built a new fiber route from Chicago to NY because it was just a touch shorter. The distances are down to hundredths of a ms. > On Jul 25, 2016, at 17:41, Bob Camp

Re: [time-nuts] [LEAPSECS] Leap second to be introduced at midnight UTC December 31 this year

A second here or there is a very big deal to those of us in the financial and database worlds. Aside from the well known instances involving electronic trading I have customers fighting over cabinet positions and cable lengths to place processors closer to disk drives and on switch paths

Re: [time-nuts] The home time-lab

Or the current version: Large AC motor driving a LARGE flywheel with an AC (and/or -48VDC) generator on the other side feeding a very large battery plant. If mains drops more than 1/2 cycle it connects the turbine and starts it up. We had a 5MW one at $OLD_GIG for feeding our supercomputer

Re: [time-nuts] Shera revisted

There are also some nice cypresses semiconductor parts that are similar and have a really nice dev environment. Basically a core surrounded by programmable logic. Code in C ore close to it. > On Aug 11, 2016, at 07:06, Bob Camp wrote: > > Hi > > To your earlier point,

Re: [time-nuts] Good GPSDO on eBay?

To paraphrase a few other folks, taking on the task of building your own, even using the VE2ZAZ board as a basis is a very educational experience. It will teach you an enormous amount. There are lessons in control systems, phase and frequency locked loops, oven controllers, phase and frequency

Re: [time-nuts] DIY VNA design

Comment inline > On Aug 21, 2016, at 18:59, Dr. David Kirkby (Kirkby Microwave Ltd) > wrote: > > I am not convinced that this is time-nuts related, although I am sure many > time-nuts either have a VNA or would like one. Such a project needs its own > forum.

Re: [time-nuts] Need 10 MHz for DSN space-probe hunting

Just shipped out three new systems for $DAY_JOB to Goldstone, Madrid and Canberra. Love it when work and time nuts intersect. > On Sep 13, 2016, at 17:35, Andy ZL3AG wrote: > > > That sounds like fun! > > Do they have a mailing list they hang out on? > >

[time-nuts] IRIG-B for OS X

Has anyone seen an IRIG-B generator for OS X sound port? I know there is one for the PC in NTP, but thought I would ask before diving in to that asp pit. Bob ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Thinking outside the box a super reference

Not to mention there is not so sensitive film, sensitive film and really sensitive film. Good old orthographic film took minutes in bright light. > On Nov 4, 2016, at 20:24, Poul-Henning Kamp wrote: > > > In message

Re: [time-nuts] Linux PPS clues?

I suspect the multitasking aspect of the OS will give you far more jitter than one could cope with. > On Nov 4, 2016, at 22:46, Casey L. Jones wrote: > > Maybe you could use something like a serial to parallel converter chip or the > serial port input of a

Re: [time-nuts] Is there any Ubuntu/Linux Software for the Z3801A?

Walter, You can always download VirtualBox and run a Windows system in there under Linux, OS X, Solaris, or whatever you like. It's free, and it works well. Oracle VM works too, but is probably overkill. Bob > On Dec 1, 2016, at 13:07, walter shawlee 2 wrote: > >

Re: [time-nuts] RPi/ beagle bone-like computer without video

Fits very nicely into a 5370 in fact. :) > On Nov 30, 2016, at 17:12, Graham / KE9H wrote: > > The BeagleBone Green is a BeagleBone Black with the HDMI and video chip > removed. > > Mouser Part number *Mouser Part #: *713-102010027, $39, In stock. > > > Makes a great

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] hp 54600a and rs-232

...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of bownes Sent: April-22-14 10:48 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] hp 54600a and rs-232 Framing error or override sounds like a parity or stop bit issues. Have you changed those

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