Re: [time-nuts] Next Aug 21 eclipse and time flow --> WWV carrier phase

Hi The gotcha with carrier phase is that it is a bit more sensitive to local signals than your ear is. Yes, a lot depends on your antenna setup and as you mention, just how many watts of distribution and thousands of feet of cable you are running 10 MHz through. Bob > On May 29, 2017, at

Re: [time-nuts] Next Aug 21 eclipse and time flow --> WWV carrier phase

Bob, unlike the guys who have many watts of 10MHz running around their labs via multiple distribution amplifiers, I do not have a big problem with my dinky 10MHz reference leaking into my radio antenna :-). This fall the "best band" for WWV for me during daylight eclipse would be 15MHz. 10MHz

Re: [time-nuts] Next Aug 21 eclipse and time flow

gio originale >Da: "Magnus Danielson" <mag...@rubidium.dyndns.org> >Data: 29/05/2017 10.43 >A: <time-nuts@febo.com> >Cc: <mag...@rubidium.se> >Ogg: Re: [time-nuts] Next Aug 21 eclipse and time flow > >Hi, > >On 05/29/2017 09

Re: [time-nuts] Next Aug 21 eclipse and time flow --> WWV carrier phase

Hi There are a *lot* of SDR boards out there today. The HackRF One is a pretty cheap one (you get what you pay for …). They go up to some very expensive setups by National Instruments / Ettus. Most of them allow for an external clock input. The usual isolation issues will still apply when

Re: [time-nuts] Next Aug 21 eclipse and time flow

In message

Re: [time-nuts] Next Aug 21 eclipse and time flow

During regular night/day cycles I can just barely observe the night-day shift in WWV propagation from Colorado to my location near Washington DC, using the NTP WWV audio refclock. It amounts to a few hundred microseconds of shift. I last touched that code about 15 years ago. Now that I have a

Re: [time-nuts] Next Aug 21 eclipse and time flow

To my mind there may be some effect due to small variations in gravity. The Chinese paper is very interesting and does propose classical explanations for the observed gravimeter anomalies. Even so , the variations that were detected by them should be detectable with a sufficiently stable clock.

Re: [time-nuts] Next Aug 21 eclipse and time flow

Hi, On 05/29/2017 09:56 AM, Poul-Henning Kamp wrote: In message , Michael Wouters writes: The effect you're looking for depends on a comparison of two different kinds of atomic clocks eg Cs vs H-maser so the maser

Re: [time-nuts] Next Aug 21 eclipse and time flow

017 10.18 >A: "Discussion of precise time and frequency measurement"<time-nuts@febo.com> >Ogg: Re: [time-nuts] Next Aug 21 eclipse and time flow > > >Maybe there is an effect when the solar wind is switched off for half an hour. >The ionosphere may shift in that time

Re: [time-nuts] Next Aug 21 eclipse and time flow

Maybe there is an effect when the solar wind is switched off for half an hour. The ionosphere may shift in that time. This is a great opportunity when an impulse is applied to the system. The switching off of the solar UV is sure to affect the ozone layer. You will not have an opportunity to

Re: [time-nuts] Next Aug 21 eclipse and time flow

Apologies, I didn't read the paper carefully enough. The original claim does appear to be for a comparison of like clocks eg Cs vs Cs, with a claim of greater effects for a comparison of clocks in and out of the eclipse path. Cheers Michael On Mon, 29 May 2017 at 8:20 am, iovane--- via time-nuts

Re: [time-nuts] Next Aug 21 eclipse and time flow

In message , Michael Wouters writes: >The effect you're looking for depends on a comparison of two different >kinds of atomic clocks eg Cs vs H-maser so the maser comparison presumably >will be a null measurement. It

Re: [time-nuts] Next Aug 21 eclipse and time flow

The effect you're looking for depends on a comparison of two different kinds of atomic clocks eg Cs vs H-maser so the maser comparison presumably will be a null measurement. But I see the path of totality passes a bit north of NIST Boulder and I'm pretty sure they will notice if there is an

Re: [time-nuts] Next Aug 21 eclipse and time flow

Personally I go with the Nature article. The other papers look like they are anomaly hunting because they have a known event. Having said that, we have two H masers at our observatory in Hobart and we have a system set up to measure their phase difference down to about 0.03 ns. I will report back

[time-nuts] Next Aug 21 eclipse and time flow

On august 21 2017 a solar eclipse will sweep USA from coast to coast. A lifetime opportunity to do coordinated experiments to check this or that. One of the questions that doesn't have a final answer yet is whether or not solar eclipses could affect the flow of time. They exist conflicting