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

There is a power amplifier that was available at the time. It's called a relay. It would probably take two or three stages to get enough power to drive the motor. Were there any relays in the box? Conservation of power says some must be taken from the fork to operate the contacts. This would

[time-nuts] Need HP 5061A setup help

Hello Time-Nuts, I have an HP 5061A (relatively new chassis) with a very old Cs tube installed (working) and I’m trying to wrap my head around the set up and calibration of this unit, and just hoping for some help. As a little background, HP changed the Zeeman modulation frequency, C-field

[time-nuts] Daylight saving time

All three of my 60KHz clocks did not advance to daylight saving time. Two are 20 year old Junghans one a one year old wall clock. waited two days and did a reset, did come up with daylight saving time Bert Kehren Palm city Fl. ___ time-nuts mailing

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

In message <160EF818076B4D03A0C067ED273D980B@system072>, "Bill Hawkins" writes: >Conservation of power says some must be taken from the fork to operate >the contacts. Electromagnetic induction could give plenty energy for that, given the size and heft of the tuning fork. --

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

On British submarine telegraph cable systems, repeater stations and receiving sites employed tuning forks. Repeater sites were at cable traffic junctions or islands; e.g., Ascension and St Helena Islands in the Atlantic, Cocos Keeling in the Indian Ocean, Norfolk Island (junction) and

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

In message , Eric Scace writes: > Frequencies around 15 Hz were common on early 20th century cables, >depending on the degree of success in compensating for the inherent >capacitance on a cable thousands of miles long surrounded by

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

Morris's figure of "taking over a minute to stop oscillating" at 25Hz, implies a Q in the ballpark of 25*60, or Q>1500, which is quite good for a tuning fork in air (usually quoted around 1000). Tim N3QE On Thu, Mar 16, 2017 at 2:04 PM, Bill Hawkins wrote: > Hi Morris, >

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

My great, great uncle, longtime design engineer for Guglielmo Marconi had a tuning fork arrangement of the type discussed here that was enclosed in an evacuated glass cylinder. I have no idea for what purpose it was used or what happened to it when he died. On Friday, March 17, 2017,

[time-nuts] Daylight saving time

My hundred year old Congreve clock didn't advance, either. Whatever should I do? :) It is accurate to about 5-10 minutes per day, depending on the mood it is in. Worthless as a timekeeper but it fascinates visitors and makes a soothing, quiet CLACK-CLACK-CLACK sound. On Friday, March 17, 2017,

Re: [time-nuts] Need HP 5061A setup help

Skip, There is a great deal of expertise as you know here. So several comments to get the ball rolling. The zeeman frequency allows you to establish the optimal beam current main peak by changing the magnetic field. What this is really doing is optimizing the state of the cesium atoms. Its

Re: [time-nuts] Smart Phone time display accuracy...?

On Thu, 16 Mar 2017 20:11:30 -0400, you wrote: >Notice Gary doesn't specify which brand of Android phone, much less >the specific model and carrier Sorry about that, and I should know better (In another group "FlDigi won't work with my radio" and nothing else...). Droid Razr M AKA Motorola

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

This is all cool stuff, and neat to read about. What's the best (Most stable, most accurate, best adev, etc.) tuning fork oscillator made? What the lowest frequency tuning fork oscillator ever built? Was 1Hz ever achieved commercially? Fun stuff for Friday! Dan On 3/17/2017 12:00 PM,

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

Professor Dr. Rohde of Rohde %Schwarz designed in the 1940-es one tuning fork oscillator for 400Hz which was to one crystal phase locked. The company built many exemplars from it. I have seen one working unit in 1967. 73 KJ6UHN On 3/17/2017 1:14 PM, Dan Kemppainen wrote: This is all cool

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

In message <338b9eed-8664-3876-afdf-610abc420...@irtelemetrics.com>, Dan Kemppainen writes: >What the lowest frequency tuning fork oscillator ever built? Was 1Hz >ever achieved commercially? Does flagpoles count ? :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20

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

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 > capacitance on a cable thousands of miles long surrounded by conductive > sea water. Is the sea water relevant? Does enough energy

Re: [time-nuts] Smart Phone time display accuracy...?

> AndroiTS GPS Test (V 1.48 Free) is good, but a battery hog I find. On > my Moto G, I find that it can handle not only the US GPS system, but > three other systems too, including Glonass, and I think the new Chinese > system. I don't recognise the last symbol, maybe Galileo. Not bad for > a

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] Daylight saving time

The man that invented the Congreve Clock was also responsible for the Congreve Rocket, as in "The rockets red glare" On 2017-03-17 4:12 PM, William H. Fite wrote: My hundred year old Congreve clock didn't advance, either. Whatever should I do? :) It is accurate to about 5-10 minutes per

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

HI all, Thanks to all those who responded to my post and also for the great pics of other tuning forks. It's amazing that they were still being used for electronic purposes as recently as the 1960s. Actually now that I think about it I have seen little tuning forks used to check the function of

[time-nuts] Optical Cesium or maybe Cesium "light"!

Looks like Oscilloquartz is getting ready to sell this commercially! Will give the 5071A a run for the money! Reliability should go way up as: -No electron multiplier -No ionizer filament -No state selection magnets Also all the fiddley bits (laser diodes and photodetectors) are external to the

[time-nuts] Need HP 5061A setup help

Skip, If you are setting against GPS then you are done. For most applications either Zeeman frequency- synthesizer setting will be fine. What the Zeeman adjust lets you do is set the frequency (via the C-field) to within the accuracy specs for the instrument without having to use another

Re: [time-nuts] Optical Cesium or maybe Cesium "light"!

Len Cutler was all set to build an optically pumped Cs beam 20 years ago. Even then, he could get the lasers. He was only missing one thing: money. HP management never agreed to fund it. The paper conspicuously omits any spec on absolute accuracy. The optical pumping does nothing to improve

Re: [time-nuts] Smart Phone time display accuracy...?

On 17/03/17 00:03, Mike Baker wrote: > Hello, Time-nutters-- > > Any thoughts on what the likely accuracy of smart phone time > displays might be? I am thinking that the stacking of delays > along the path to its receive antenna plus any internal processing > delays would accumulate to some

Re: [time-nuts] Smart Phone time display accuracy...?

Hi > On Mar 16, 2017, at 9:43 PM, Hal Murray wrote: > > > kb...@n1k.org said: >> Under normal conditions, the Gold Codes on CDMA are synchronized to < 100 >> ns. > > Is that a full time synchronization, or something like a PPS where they can > get the ticks lined up

Re: [time-nuts] MSF maintenance day

I recorded one of the 2009 outages: https://www.youtube.com/watch?v=1vQPgcja770 I probably have some of the raw data somwhere. They actually turned it on and off a few times over the period. David. ___ time-nuts mailing list --