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 th
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 tu
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 referen
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
mo
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 day,
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
>> capacitance on a cable thousa
> 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 co
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,
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
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 s
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
p...@free
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, ti
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 XT-107
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 physica
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, Poul-Henning
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 conductive
>sea water. Cable compensation is an enti
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,
>
> If there's no activ
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.
--
Poul-Hennin
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 Fanning
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 reduc
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
in
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 li
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 unkno
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 but not know the time for
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 -- time-nut
25 matches
Mail list logo