Re: [time-nuts] Sparkfun

It's always possible to underestimate the demand for something. And "free" seems to be a powerful motivator to people. A while ago, someone who used to be one of the Unix sysadmins at a local university (UBC) left to work at the group within Google that runs their computer systems. A while later

Re: [time-nuts] HP 5245L counter circa 1967 humor

get more sensitivity out of my 5245L so that it would respond more reliably to the tiny 32kHz signal on my nixie wristwatch oscillator. I'll be tuning up a lot of them in the coming weeks. I have a parts unit on hand (burned-up oven) and an original manual. Both come in handy. -- --

Re: [time-nuts] HP 5245L counter circa 1967 humor

idea. I'll look for those plugins. I actually remember thinking about getting the video amplifier many years ago, but that was in the year 6 BE (before ebay). -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ ___ time-nuts mailing

Re: [time-nuts] Digital Clock kit - no Integrated circuits!

cade. My twin brother built a clock out of some old Beckman hollow-state counters... http://www.selectric.org/tubeclock/index.html -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ ___ time-nuts mailing list -- time-nuts@febo.com To unsubscri

Re: [time-nuts] HP 5245L counter circa 1967 humor

http://www.decadecounter.com/vta/articleview.php?item=639 -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ ___ 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 instruc

Re: [time-nuts] HP 5245L Question

gled way. Nixies are still viable display elements, and they can be driven nicely with the TD62084 or the similar TI SN75468. -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ ___ time-nuts mailing list -- time-nuts@febo.com To unsubscr

Re: [time-nuts] Sidereal time

IG time from a GPSDO directly. The time accuracy needed is ~1 millisecond. LST is calculated using the canonical 10 digit number cited previously. --David Forbes, the HHSMT, Arizona ___ time-nuts mailing list -- time-nuts@febo.com To unsu

Re: [time-nuts] HP10811 losing EFC

Agilent part FUSE-THERMAL 115C, part no. 10811-80008, $3.97 ea. as of 2 years ago. I did have a 10811-60111 in a 5345A that had the thermistor open up which blew the thermal fuse. The thermistor was interesting to replace. 73, David N1HAC At 09:08 PM 1/15/2010, you wrote: Several months

[time-nuts] Tbolt and iCruse readout problem - any ideas?

ruse doesn't display negative values for DAC V, c) my iCruse is faulty. I've pretty much run out of ideas on this one, so any suggestions would be greatly appreciated! Regards, David Bobbett, Milton Keynes, UK. ___ time-nuts mailing list -- tim

Re: [time-nuts] Tbolt and iCruse readout problem - any ideas?

the other data is being received correctly, there doesn't seem to be any logical reason why the DAC data would be any different. Thanks for the reply, but I'm still puzzled! David, G4IRQ On 18/08/2010 12:33, Didier Juges wrote: When you say "will not display the DAC V v

Re: [time-nuts] Tbolt and iCruse readout problem - any ideas?

Hi Brooke, I know what you are thinking! Sadly the supply is 12.1v so there's plenty of regulator headroom, very interesting page though. I'm beginning to think that Didier's suggestion of corrupted firmware in the iCruse is the most probable explanation. Best wishes, Da

Re: [time-nuts] Tbolt and iCruse readout problem - any ideas?

. On 19/08/2010 08:22, David Bobbett wrote: Hi Brooke, I know what you are thinking! Sadly the supply is 12.1v so there's plenty of regulator headroom, very interesting page though. I'm beginning to think that Didier's suggestion of corrupted firmware in the iCruse is th

Re: [time-nuts] Antenna problems

hey are purpose designed for use outside and I have never had any problem buying from China. I bought all my Tbolt gear from 'fluke.l' without a hitch and would recommend him. David On 22/08/2010 03:35, Mark J. Blair wrote: On Aug 21, 2010, at 7:15 PM, Peter Krengel wrote: Warren f

[time-nuts] Slightly OT - GPS-Based Accurate Direction Finding

data to come up with an azimuth figure. Has anyone heard of a (Open Source?) program that could be used to do these calculations? Regards, David Smith ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cg

Re: [time-nuts] Slightly OT - GPS-Based Accurate Direction Finding

Thanks for all the interesting responses. Some background - I'm needing an accuracy of 1 degree or better. The experiments are using digital communication modes and sometimes aircraft scatter so signals are regularly inaudible and often non-existent, so peaking "by ear" is not usually an opti

Re: [time-nuts] watch innards video

Norm, the link was stripped out of your message. Please send it to me directly. Thanks, Dave W6TE > Date: Wed, 8 Sep 2010 10:32:52 -0400 > From: normn3...@stny.rr.com > To: time-nuts@febo.com > Subject: [time-nuts] watch innards video > > Hi all!! > If you don't know a mainspring from an es

[time-nuts] Upgrading old Thunderbolt?

Suppose I have an old Thunderbolt that works, but has the old Piezo OCXO. Is it feasible to upgrade it "in place" by obtaining one of the newer Trimble oscillators from somewhere (or something equally good that fits mechanically)? Does the Trimble OCXO need different operating parameters than the

[time-nuts] Question about SoundCard stability?

by an OCXO or GPSDO of any kind. Anyone? Dr. David McClain, N7AIG Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995 web: http://refined-audiometrics.com

Re: [time-nuts] Question about SoundCard stability?

ere is not producing much in the way of Doppler shifting. And even if it were, that shouldn't be measurable to me at the audio frequencies. Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiome

Re: [time-nuts] Question about SoundCard stability?

Okay, perhaps I should rephrase the question... Is is reasonable to expect a TCXO to perform at 4e-9 over the FFT window period of about 87 sec? I can only imagine that the enormous (87 s) averaging period is making my measurements look so good. Dr. David McClain Chief Technical Officer

Re: [time-nuts] Question about SoundCard stability?

ated" peak frequencies are a bogus technique, and you can only truly count on variations on the order of the FFT cell size as being measurable... Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiome

Re: [time-nuts] Question about SoundCard stability?

really do show the drift one should expect. Cheers, Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995 web: http://refined-audiometrics.com On Oct 12, 2010, at 18:25, Ran

Re: [time-nuts] Question about SoundCard stability?

ith caution. What it reports can be wildly off- base. Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995 web: http://refined-audiometrics.com On Oct 12, 2010, at 19:47, Mark

Re: [time-nuts] Question about SoundCard stability?

human patience... Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995 web: http://refined-audiometrics.com On Oct 12, 2010, at 22:52, David McClain wrote: Yes, indeed. I d

Re: [time-nuts] Question about SoundCard stability?

nt of note regarding interpretation of SpectrumLab reported frequencies taken... Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995 web: http://refined-audiometrics.com On Oct 12,

Re: [time-nuts] Question about SoundCard stability?

slow. Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995 web: http://refined-audiometrics.com On Oct 12, 2010, at 23:25, John Miles wrote: I think I have answered th

Re: [time-nuts] Question about SoundCard stability?

uency estimate. However, if the signal is drifting, you'd have to account for that in the phase advancement too... Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995

Re: [time-nuts] Question about SoundCard stability?

Hi Jim, Can you give any more precise hints, e.g., links to articles? You mentioned Prony, Music, and Espirit. You caught my attention with your analogy to interferometry... Cheers, Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ

Re: [time-nuts] Question about SoundCard stability?

Thanks for that Jim, ... I see that Prony's method bears some relationship to AR deconvolution. Interesting... http://www.dsprelated.com/dspbooks/filters/Prony_s_Method.html Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ

Re: [time-nuts] Question about SoundCard stability?

orowitz & Hill, if the frequency to be counted is substantially below your counter timebase, then you should count zero crossings of the higher timebase frequency in the period of the lower frequency under test. Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory

Re: [time-nuts] measuring frequency

assertion? Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995 web: http://refined-audiometrics.com On Oct 14, 2010, at 06:16, jimlux wrote: David McClain wrote: Or, n

[time-nuts] New (refurbished) LPRO-101 GPSDO

etter than this. So already I'm < 5e-10. But that's about all I know until I see it lock. (If it ever does...) eh? Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone:

Re: [time-nuts] New (refurbished) LPRO-101 GPSDO

tand that GPSDO's don't necessarily have internal Rb references -- looks like the T'Bird is just a really good OCXO with a GPS discipline. And everyone is raving about T'Birds... The LPRO has an internal Rb reference and an untamed VCXO. Thanks for all the adv

Re: [time-nuts] New (refurbished) LPRO-101 GPSDO

e the groundplane idea a try with one of my wife's cookie sheets... Cheers, Dr. David McClain Chief Technical Officer Refined Audiometrics Laboratory 4391 N. Camino Ferreo Tucson, AZ 85750 email: d...@refined-audiometrics.com phone: 1.520.390.3995 web: http://refined-audiometrics.com On Oct 17, 2

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

Where is k4obb's website? Dave W6TE - Original Message - From: paul swed To: Discussion of precise time and frequency measurement Sent: Friday, October 22, 2010 7:00 PM Subject: Re: [time-nuts] Maintaining boatanchors (wa

Re: [time-nuts] Determining Time-Nut infection severity.

On Sun, Oct 24, 2010 at 1:44 PM, Richard H McCorkle wrote: > Time-Nuts, > > New members to the Time-Nuts list may wonder if the Time-Nut disease > has infected them just by joining the list. A clear indication that > someone has been infected with the Time-Nut disease is they own a > reference tha

Re: [time-nuts] Why .30 cal holes can't be seen at 800 yds...

a chaotic attractor basin of fractal dimension between 6 and 7. Hence a feedback Perceptron neural network can be trained on the speckle sequences and this also works very well. That's how we did it on the Steward Observatory 90-inch. Dr. David McClain Chief Technical Officer Refin

[time-nuts] Thunderbolt 10MHz

some internal memory backup device that dies with age? Any suggestions would be appreciated. David David G. Hopkins (VK4ZF) CAPALABA QLD AUSTRALIA 27.32.38S 153.12.03E QG62OL Skype :- davhop ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Do I have a defective thunderbolt?

I wonder if you are suffering from multipath. The GPS receiver assumes that the measured delay in the signal from each satellite is along the most direct path from satellite to antenna. If your antenna "sees" a signal that has been reflected from a nearby building, and the reflected signal is str

[time-nuts] Anyone using Silicon Forrest's LPRO-GPSDO?

just had a plain vanilla Rb with a BNC on the front. I'd rather live without GPSDO on the Rb and just track its performance over time. For that reason I just ordered a Stanford PRS10 so that I could do PPS time tagging to keep a watch on the Rb. Dr. David McClain Chief Technical Officer

Re: [time-nuts] Loran?

As written in Wikipedia and as I have always understood: "The term RADAR was coined in 1940 by the [1]U.S. Navy as an [2]acronym for radio detection and ranging." David At 01:04 PM 12/20/2010, you wrote: IMO this trend is a two edged sword: I don't

Re: [time-nuts] GPS Antenna

from time to time on ebay, but check the specifications carefully because the lower gain versions look the same - a bit like a white plastic easter egg! Regards, David On 30/12/2010 23:25, Chris Albertson wrote: A few questions about GPS antenna 1) I read the Thunderbolt user manu

Re: [time-nuts] LCD display connector

Active Electronics is another source of 99.9% pure isopropanol, and they have walk-in stores in a bunch of major US and Canadian cities. I use it for most electronics cleaning, but it also cleans optics without leaving a residue (unless there's a lot of junk on the surface to dissolve and redistrib

Re: [time-nuts] LCD display connector (really isopropanol sources)

>From an ordinary drug store in Vancouver BC, my wife found "Isopropyl Alcohol 99% USP", described as "Topical antiseptic and anti-bacterial agent". The manufacturer is "Pure Standard Products". She says it was just sitting on the shelf at this drug store. If you can't find it at yours, try aski

Re: [time-nuts] worth salvaging ?

On Sat, Jan 29, 2011 at 10:14 AM, Mark J. Blair wrote: > In a receiver that doesn't have a recent almanac, and particularly in an > older receiver that takes a very simple approach to downloading ephemeris and > almanac information, initial acquisition could take a long time. It'll need > to d

Re: [time-nuts] Frequency multiplication

FPGA's do not have good jitter performance. Both Altera and Xilinx have app notes and specs on what to expect for jitter performance. Particularly when using high speed DACs (like the ADI AD9739) the technique used is to drive the DAC with a good quality clock, then the DAC drives the FPGA.

Re: [time-nuts] OT- RMC sentence and magnetic variation/compensation in GPS module

Garmin receivers provide that data in their RMC sentence. They apparently calculate it automatically using a mathematical model of the earth's magnetic field, so its accuracy would depend on the accuracy of the model. The GPS system itself does not provide a way to measure variation. With the ha

Re: [time-nuts] HQ 5370B manual available

On 22 February 2011 12:17, John Miles wrote: > Nice scan, thanks!  Same edition as David Kirkby's earlier scan, but with > full-page foldouts.  This one goes on the iPad for sure. > > -- john, KE5FX The 5370B manual on the Agilent web site is a downsampled version of the one

[time-nuts] Newby with questions

I have a thunderbolt up and running since last week Friday. I'm doing this for a calibration source at work, eventually we will have two antennas, feedlines, and thunderbolts, so that we can have one fail and keep operating, but for the moment I just have the one receiver. Both antennas are mo

Re: [time-nuts] Newby with questions

The 24 GPS satellites are in orbits that never pass over the poles. I think they are about 60 degree inclinations. By your description you must be in the northern hemisphere. If you can, set up your antenna so it can see to the south and don't worry if the view of the north is blocked because

Re: [time-nuts] Newby with questions

Hi If everything in the plant gives the same answer - do you actually care if you are 0.5 ppm off? In a lot of cases the answer turns out to be no, provided the drift rate is very low. I wish that were the case, but things are far enough off that it's a problem. The counter, signal generator a

Re: [time-nuts] Newby with questions

Not completely ignorant. He described the plot of coverage as a "mouse bite" taken out of the North. That implies to me that he is not way up there in high latitudes as is even southern Sweden. As you move south there is no "hole" or more precisely you can't even see to the center of the hole

Re: [time-nuts] Newby with questions

> Stuff (snow, rain, birds, space aliens) can pile up on the skylight. That > messes with the GPS signal. You really want to get the antennas outdoors if > at all possible. > > When you do get them outdoors, don't forget that the electric code (and > common sense) requires that you put a proper gro

Re: [time-nuts] NMEA time off

This might help: http://leapsecond.com/java/gpsclock.htm -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Thursday, March 03, 2011 12:29 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nut

Re: [time-nuts] Low noise power supply

I had this problem when using some ultra low light imagers. They have NO PSRR, and the integration times were up in the 1-3 second range, so any noise on the pixel supply ended up in the image. I used an ICL-9000 regulator which has ultra high PSRR, and I used a switcher running at a specific

Re: [time-nuts] Low noise power supply

I used an ICL-9000 regulator ISL-9000. Sorry. http://www.intersil.com/products/deviceinfo.asp?pn=ISL9000 ___ 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 i

Re: [time-nuts] Low noise power supply

Os. *lol* If the designer ever heard of corner frequency?? And the ISL9000A is the same. - Henry -- ehydra.dyndns.info David C. Partridge schrieb: > H I wasn't impressed. The 'scope screen shot of noise levels on the > outputs used 20mV/division, and the thickness of the

[time-nuts] HP 5370B is sold

I put a post on here a day or two ago saying I had a 5370B for sale. It has now been sold. Dave ___ 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 t

Re: [time-nuts] Parts Selection

Done it in the before - Yes Done it in the basement / last 2 years - Yes Set up to do it in the basement - Yes (bedroom, no basement) Would I buy one - done that before. Yes Would actually do it in a reasonable amount of time - Yes ___ time-nuts maili

Re: [time-nuts] Tissot wrist watch

Picking up the crystal frequency should work with older quartz watches that use a trimmer capacitor to adjust the crystal frequency. But recent quartz watches use a crystal that's deliberately too high frequency, and a divider chain that drops one oscillator pulse every so often to bring the overa

Re: [time-nuts] GPS position averaging software?

I did this with our newly installed Thunderbolt. When I plugged the coordinates into Google Earth, the center of the image was dead on with the skylight where the antenna is. Not just pointing at the skylight, but the correct part of the skylight. Could be coincidence, but I'd say the error

Re: [time-nuts] GPS position averaging software?

True, but my setup isn't very portable. I'm happy, I'm getting my 10.00 MHz output and it's WAY more accurate than I need. The rest is delicious bacon gravy! ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.c

Re: [time-nuts] Thunderbolt serial port problem UPDATE

precaution I have retro-fitted the missing components, a la Didier, it doesn't address the data display problem of course, but otherwise the monitor works OK. Just don't think you'll get any after-sales support! David On 14/04/2011 02:09, Dan Rae wrote: On 4/13/2011 5:19 PM, Chris

Re: [time-nuts] Thunderbolt serial port problem UPDATE

precaution I have retro-fitted the missing components, a la Didier, it doesn't address the data display problem of course, but otherwise the monitor works OK. Just don't assume you'll get any after-sales support! David ___ time-nuts maili

Re: [time-nuts] OT: At the Flea

A high-school student won first prize in his science fair by circulating a report on the dangers of DHMO, then asking his peers what action (if any) should be taken (i.e. should it be banned?). http://www.snopes.com/science/dhmo.asp ___ time-nuts ma

Re: [time-nuts] Dist Amps Questions

/worry || be_happy. 1. 50/75 ohm question. I know that putting 50 ohm source into a 75 ohm device will cause SWR. I know that the total power delivered to the device will be the difference between forward power and reflected power. So that doesn't seem bad, just might have a lower power

Re: [time-nuts] 60hz disciplined watch follow up

My orignal post that 60hz light flicker received at citizen ecodrive solarcells is used to discipline the watchs rate, needs a little correction to my post as brought to my attention by the replies. Yes it is actually 120hz flicker 60 positive cycle flickers and 60 negative cycle flickers per

[time-nuts] Tbolt LCD Monitor - No DAC reading

do shortly. I thought it would be useful if I let other 'sufferers' know what is happening, in case somebody has something to add to the information. Please feel free to contact me off list if you prefer. David Bobbett, G4IRQ ___ time-nu

Re: [time-nuts] Tbolt LCD Monitor - No DAC reading

a specific issue with DAC related sub-routines. The only puzzle is that most of the monitors do work OK as far as I know - maybe somebody got different versions of the firmware confused - or is it something else? David On 12/05/2011 08:56, Mark Sims wrote: I have a sneaking suspicion that I

Re: [time-nuts] Tbolt LCD Monitor - No DAC reading

2001 Mfg: 10.00 24 Mar 2003 Ser:0.80253721 I would have thought 5 minutes of testing would be more than adequate, I usually work on the principle that if there's no smoke it must be working fine ;-) David, G4IRQ On 12/05/2011 11:46, shali...@gmail.com wrote: The DAC voltage routi

Re: [time-nuts] Fw: Tbolt LCD Monitor - No DAC reading

here uses XP and I can use LH, Tboltmon or your bespoke software. David On 12/05/2011 14:32, shali...@gmail.com wrote: "I may need someone who actually gets a negative voltage to send me the actual string returned from the TBolt." ___ ti

Re: [time-nuts] Tbolt LCD Monitor - No DAC reading

That info would certainly increase the chances of it being an issue with handling -ve numbers. I wonder if anybody on time-nuts has an LCD monitor which can display negative values? David, G4IRQ On 12/05/2011 16:58, Jim Hall Sr. wrote: I have the same symptoms. Two Thunderbolts, #1 has

Re: [time-nuts] Sidereal timekeeping

The motor is essentially a permanent-magnet stepper motor. The rotor and stator have just 2 poles each, so the rotor has two stable positions 180 degrees apart that provide holding torque. Thus, the motor holds position with no input current for most of each cycle. To move it, the drive applies

Re: [time-nuts] What are these towers?

There is a similar array of 8 towers on the southern shore of Lake Ontario, at 43° 12' 50" N 79° 36' 30" W. I used to drive past it frequently when I lived in that area. I once found an article describing the design of that particular array. It is apparently the antenna for a powerful AM broadc

Re: [time-nuts] LightSquared

"Hello, can I short my L^2 stock?" :) From: time-nuts-boun...@febo.com [time-nuts-boun...@febo.com] On Behalf Of Bruce Lane [kyr...@bluefeathertech.com] Sent: Monday, May 23, 2011 1:39 PM To: time-nuts@febo.com Subject: Re: [time-nuts] LightSquared

Re: [time-nuts] smallest rubidium

107 GPSDOs. > >Check out the press release about these on our Jackson Labs Tech website for >more info.. > >Better than 4E-013 over 100K seconds typically, beats most RBs. > >Said > >Sent from my iPad > >On May 23, 2011, at 10:17, Magnus Danielson wrote: > &g

Re: [time-nuts] What's the best way to double 10 MHz to 20 MHz ?

On 27 May 2011 15:21, Bob Camp wrote: > Hi > > You also may want to avoid an oscillator with much 10 MHz content in it. All > sorts of odd things can happen with spurs when you have unplanned stuff on > the main reference. Another thing to look closely at is - how much of the > radio tracks the

Re: [time-nuts] Strange temperature peak

> Does anybody have a possible explanation for this ? Ghosts, of course! Likely an issue with the temp sensor, their conversion isn't necessarily flat. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-b

Re: [time-nuts] fluke.l monitor for Thunderbolt

check the '232 lines from the iCruze plug all the way back to the PCB. If that doesn't work, there's a circuit diagram of the device on Didier's web site. 73 de David, G4IRQ On 04/06/2011 22:17, Steve wrote: About a year ago I installed one of the iCruze monitors from

Re: [time-nuts] Advice on NTP server needed

Unfortunately, my D525 mobo doesn't have a serial port and my symetricom doesn't like the usb converter. One of these days somebody is going to make a usb coverter that really looks like a serial port. I'm probably going to buy a serial card for the box i

[time-nuts] Watch out for a scam by Alex Barski. VE3XAX

I checked, the information agreed.But yesterday they were definitely different. 2) When I offered to pay via Paypal, I received this: "Thanks for the response to my email David but i am sorry i don't use paypal or bank transfer as means of payment due to the instruction giving to me by my

Re: [time-nuts] Bob Pease

A good friend of mine is a huge Bob Pease fan and also a devout non-wearer of seat belts. He's already used-up one of his nine lives on an accident where he wasn't belted-in. Hopefully this unfortunate reminder will cause him to change his mind about belt use. Buckle up! Wear your seat b

Re: [time-nuts] cordic

16 bits in is 64K *entries* of 16 bits each, a total of 1 megabit of ROM. The usual 90/180 degree folding could reduce that to 256 kbit. Dave On Tue, Jun 21, 2011 at 7:49 AM, Jim Lux wrote: > So then, it's a trade between a big ROM LUT or a bunch o'gates for CORDIC. >  And for big N the bun

Re: [time-nuts] How accurate are cheap radio controlled clocks?

On Sat, Jun 25, 2011 at 12:19 PM, Dr. David Kirkby wrote: > I've got one of the cheap radio-controlled clocks? I was listing to radio 4 > the other day and herd the time signal. The radio controlled clock was about > 3 seconds off. I was a bit surprised it was so far off. I'm j

Re: [time-nuts] No more 60Hz! TEC Elimination

They were talking about a very small drift here. Even if the change were ten HOURS in a year, that's one part in 876. I highly doubt your shaver is going to be affected by grid tolerance. I wouldn't plug a 60 hz model into 50 hz, but that's different.

Re: [time-nuts] Transformers

Locally, there was a radio station running PSAs to tell people to unplug their cell phone chargers "To save the environment". I was very tempted to call in with some envelope calculations on the energy expended to send out the PSAs vs the energy saved. It's not easy being green, but it's easy

Re: [time-nuts] Transformers

Well... It is possible to design these things so that they are quiet. I have put many designs through FCC and CE certifications, with emissions so low that they are asking me "Is that thing on?" :)Two layer boards, no expensive shielding or suppression. It takes careful design of the P

Re: [time-nuts] Lightsquared goes Global...

Years ago, microsoft wanted to take over one of the ham bands, 2m or 440 I forget which, for satellites for internet in poor areas. Swatch wanted to have everyone change to "beats" instead of seconds and minutes. Stupid ideas abound, but they usually fall apart. ___

Re: [time-nuts] Lightsquared goes Global...

is not a growing business. However, the MS scheme is kind of dumb. The gear would sniff the ether and automatically use the spectrum. They should really just refarm the spectrum. -Original Message- From: David VanHorn Sender: time-nuts-boun...@febo.com Date: Thu, 30 Jun 2011 12:04:42

Re: [time-nuts] Lightsquared goes Global...

Chuck Harris David VanHorn wrote: > > This was not the "white space" plan, it was specifically targeted at either > the US > 2M or 440 band. I just don't remember which. ___ time-nuts mailing list -- time-nuts@febo

[time-nuts] HP 8566B repair YTO Unlock

I finally got work to spring for a nice SA. Based on a recommendation from our EMC guy, I chose an 8566B from Ebay. Well, less than a week after arrival, it started giving me "YTO Unlock" messages, and in the 0-2GHz band, it would show a 100 mhz carrier at 1.53 GHz (more or less) After a bit o

Re: [time-nuts] fluke.l monitor for Thunderbolt . . . the saga continues

I've heard this discussed a few times, and the idea of using diodes to "regulate" this way makes me very queasy. Why would a real 3.3V regulator not be used? If the new chip requires 3.3 vdc and there aren't 3 diodes on the board to drop the 5 vdc down,

Re: [time-nuts] fluke.l monitor for Thunderbolt . . . the sagacontinues

----- From: David VanHorn Sender: time-nuts-boun...@febo.com Date: Wed, 6 Jul 2011 14:56:47 To: Discussion of precise time and frequency measurement Reply-To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] fluke.l monitor for Thunderbolt . . . the saga contin

Re: [time-nuts] fluke.l monitor for Thunderbolt . . . the sagacontinues

: [time-nuts] fluke.l monitor for Thunderbolt . . . the sagacontinues But surely it doesn't matter David? There is nothing critical in there, it's just a display. As long as the voltage is within the processor's operating window, that is surely good enough? Peter On 7 July 2011

Re: [time-nuts] fluke.l monitor for Thunderbolt . . .the sagacontinues

nderbolt . ..the sagacontinues So David, Does that mean you are going to layout a "proper" new board for all of us ? As I am sure you are aware, the original procesor does not appear to be available so that would mean a new design using a current or cutting edge cpu version.

Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis

So what is the Allan deviation of the earth spinning? :) ___ 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] Japan Quake May Have Shortened Earth Days, Moved Axis

COOL! From: time-nuts-boun...@febo.com [time-nuts-boun...@febo.com] On Behalf Of Tom Holmes [thol...@woh.rr.com] Sent: Thursday, July 14, 2011 10:17 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Japan Quake May Hav

Re: [time-nuts] Anyone know what this counter is?

Apols for hijacking the topic, but does anyone have info on another Nixie based frequency counter? It's a Venner TSA6636/2M and uses early Fairchild Micrologic ICs, it's rather ill at the moment, so any info would be gratefully received. Fingers crossed and thanks in advance! Da

Re: [time-nuts] The future of UTC

I agree on DST, I was very disappointed when Indiana joined the lemmings. I'd take it one more step, and eliminate time zones. Everyone operates on UTC(x) So you get to work at 2100, and work till 0500.. I know my mom is up till 0700. No matter where you are, you know what time it is, and no

Re: [time-nuts] Panel Mount Frequency Counter

I would love to find one like this that takes a 10 MHz ext ref, and will count 16 MHz to at least 1 Hz. I need two of those today. From: time-nuts-boun...@febo.com [time-nuts-boun...@febo.com] On Behalf Of Chris Albertson [albertson.ch...@gmail.com] Sen

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