Re: [time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3

PINGING Mike Monett . Thanks for your off-list offer of assistance with startup of this simulation. Unfortunately, your e4ward.com spam filter is a bit too effective. When I tried to respond to your email, it denied knowing anything about you. Please try again - from a

[time-nuts] Spectratime SRO100/SRO75 rubidium question

Versions of these oscillators prior to firmware version 1.96 had a user programmable DDS in them that could generate up to 20 MHz on pin 11 of the DB25 connector. All references to the commands to program this output have been removed from the current documentation. Does anybody have any

Re: [time-nuts] Pendulum clock suspension

List -- we don't normally do wrist watch or pendulum topics here on time-nuts. There are many publications [1] and forums [2] for that Iovane -- but, here's a quick answer: > This puzzled me since yesterday as I discovered how the suspension of > pendulum clocks is made, that is a springy

Re: [time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

Citerar Mark Sims : In the standards definitions that include "at sea level", the question these days is "which sea level?". As ocean temperature changes sea level will change (except maybe in Washington DC). Will the standards be amended to include something like

Re: [time-nuts] Pendulum clock suspension

> This puzzled me since yesterday as I discovered how the suspension of > pendulum clocks is made, that is a springy plate. There is less loss in a suspension like that than there would be in a pivot bearing. The spring doesn't change parameters as it gets dirty or the oil dries out. >

[time-nuts] Pendulum clock suspension

This puzzled me since yesterday as I discovered how the suspension of pendulum clocks is made, that is a springy plate. I thought that: -the suspension point (i.e. the point the pendulum moves about) cannot be considered fixed, -following the above, the lenght of the pendulum varies during a

Re: [time-nuts] General Radio Model 723D Precision Oscillator (Tuning Fork)

Here is the link to some fine pictures and the schematic. Its uasable. http://worldpowersystems.com/J/instruments/GR723/ As a heads up the AC power comes in and is immediately doubled. Loaded something like 164 VDC. Reg tubes 107 V. Osc draws 35 Ma at 135V B+. Fil 1.42V@47 ma. Distortions quite

[time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

A 30 cm daily vertical offset is pretty typical. I've seen over 45 cm. Horizontal offsets are usually less than +/- 75 mm per day with the longitude displacement typically twice the latitude displacement. Heather uses a standard model (see http://geodesyworld.github.io/SOFTS/solid.htm) to

Re: [time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

Checkhttps://en.wikipedia.org/wiki/Earth_tide According to that, a foot of motion is easily plausible. The Wiki article says that displacements around a meter in the solid crust can be seen over the right intervals. This must wreak havoc in VLBI geodesy work, except that for some in the

[time-nuts] DATUM RubiSource 2000 RUBIDIUM TIMING SIGNAL REFERENCE

I recently purchased a DATUM RubiSource 2000 RUBIDIUM TIMING SIGNAL REFERENCE does any one have a manual or detailed technical information. Please contact me off list. Thank you Bert Kehren ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

Hi Just as there are Time Nuts, there are Tide Nuts (I suppose it’s capitalized …). There is a a lot of data out there on just what sort of solid tides one might see at this or that point. Bob > On Dec 10, 2017, at 7:29 AM, Azelio Boriani wrote: > > Is that a

Re: [time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

Is that a Trimble Thunderbolt? Is there a way to compute the uncertainties? On Sun, Dec 10, 2017 at 2:42 AM, Tom Holmes wrote: > Mark... > You're place really moved a foot in 48 hours? Impressive and scary! > > From Tom Holmes, N8ZM > >> On Dec 9, 2017, at 8:19 PM, Mark Sims

Re: [time-nuts] Helmholtz Resonator and other Maintained Oscillators

Hi, Recommended reading relating to this is the acoustical and audio engineering material. "Acoustical Engineering" by Harry F. Olson is a really good book. I covers many of the theory work on speakers etc. and uses electrical models and ways to estimtate their effects. This book I have