A number of the NTP servers are LeoNTP. The 1.24 firmware release (
https://leontp.com/firmware/) seems to fix the problem.
(My local LeoNTP now sets leap=0).
There may be a common bug affecting multiple ntp server models. The
incorrect leap indicator began 256 weeks + 1 days since the
A leap second is due 31 December. I'm sure I've seen reference to a "leap
second pending" flag in some reference to time keeping somewhere.
Andy
www.g4jnt.com
On Sat, 27 Nov 2021 at 15:23, Steven Sommars
wrote:
> FYI.
>
> At 2021-11-27 00:00:00 UTC many public NTP servers began setting the
I think that Tom's GREAT adventure is kind of what sealed the deal making
me a time-nut or at least a time-nuts lurker, a lot of this stuff is still
little over my head, but I keep reading.
If anyone is inclined and has the clocks and the kids ( I don't have
either ), there is always Mount Evans
Hi
Roughly speaking the OCXO is 40 Hz or 8 ppm at the max end of the tune range.
That’s a lot.
If your OCXO is that low, then yes, it is a problem. You either need to repair
or replace
the OCXO. If you are replacing, the question becomes - do you upgrade to a 10
MHz
10811? That would
For newcomers to time-nuts, Andy is asking about my DIY gravitational
time dilation experiment(s).
> What am I missing?
It looks like you used the wrong value (or wrong units) for "h".
The summit of Mt Rainier is 14411 ft (4400 m), but the highest point on
Mt Rainier that is accessible by
On 11/27/21 3:20 PM, Magnus Danielson via time-nuts wrote:
Hi,
There is an overemphasis on the atom being used, and especially on
cesium as that is what is used for SI definition. However, actual
implementation means actual physical devices, and the physical devices
have a physics package,
Jared,
You have to be within .25Hz so yes I'd say that's most likely your
problem!
Cheers,
Corby
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Hi
When I last bought 3120A’s they sold for about $15K. The 53100A was in the same
range
before it moved over to Microsemi. One would *guess* the price went up.
The 5120A is (essentially) obsolete at this point. Microsemi shows it in the
“not recommended”
category. I believe the last one we
Hi,
The electrical tune (fine control knob) is set to midrange now, at the 250
setting. The mechanical tune (the one in the OCXO itself) is maxed to its limit
and I can't raise it further.
My 5335A has the OCXO option, so if it is compatible, I might be able to do a
swicharoo into the 5065A
Hi,
I have performed the test with the 10Mohm resistor.
With an 0.5V P-P signal from the function generator into A7J1, I get 980mV at
A7TP2 (Manual says it should be about 0.9V)
When I probe the A7 output (Yellow wire) i get a good output as described in
the manual too, so it looks like my A7
>>The incorrect leap indicator began 256 weeks + 1 days since the previous
leap second.
The incorrect leap indicator began 256 weeks - 1 day since the previous
leap second.
Sorry for sign error
On Sat, Nov 27, 2021 at 11:38 AM Steven Sommars
wrote:
> A number of the NTP servers are LeoNTP.
Jared absolutely thats 40 Hz low. It needs to be about +/-10 Hz or less.
Granted the system has a wider range. For the heck of it can you fairly
easily inject your 5 MHz gpdso 9about 0 Hz off)into what the OCXO feeds.
You only actually need A10j3 marked 1V on the OCXO. You can leave the other
5
On 11/27/21 12:37 PM, Thomas Valerio wrote:
I think that Tom's GREAT adventure is kind of what sealed the deal making
me a time-nut or at least a time-nuts lurker, a lot of this stuff is still
little over my head, but I keep reading.
If anyone is inclined and has the clocks and the kids ( I
Hi
Just to double check.
There is an electrical tune (controlled by the multi turn pot) and a
mechanical adjust on the OCXO. The “that needs repair” judgement
is based on both being adjusted to their “max high” setting *and* you
still being ~40 Hz low.
I doubt that you have 40Hz of range
j...@luxfamily.com said:
>> Was just speculating what Ben Nevis at a mere 1340m height might offer
> Considering the parking lot is around 200m, carrying the clocks and power to
> the top might be moving from a moderate walk to the strenuous category. One
> might also want to do this in
Hi Thomas,
Good to hear the experiment was contagious for you. If you have
additional questions let me know.
Your suggestion about Mount Evans and Pikes Peak are excellent. You will
enjoy this 2017 paper:
"An Undergraduate Test of Gravitational Time Dilation"
j...@luxfamily.com said:
> There's a variety of roads that go to ~12,000 ft in Colorado, about ~10,000
> in CA (Tioga Pass isn't closed yet), so you can get about 3x change, but
> still you're talking <1E-12.
If you want height above a base station, Colorado starts high. Pikes Peak is
No, there's no route to the top of Ben Nevis other than a clamber on a
rocky path - I did it once in years gone by. You'd have to be young and
Special Forces trained or similar to get a 5071 with power up there!
You may be thinking of Mt Snowdon in Wales, that has a rail route to the
top.
Tom,
Hello,while getting closer to my first really phase noise measurement setup
with a HP 3048a , I cant stop looking at products from this decade. Does anyone
have an idea how much the microsemi products 5120a and 53100a costs? On the
datasheets it looked like made for newbees like me: Press one
Corby, what is the easiest way without removing the 10811 from the 5065A that
the 10811 is properly controlling at temperature? Is any measurement
accessible?I've forgotten if the OCXO freq is low or high if the oven is not at
temperature; please explain.LarrySent via the Samsung Galaxy S20
FYI.
At 2021-11-27 00:00:00 UTC many public NTP servers began setting the leap
indicator to 1.
This may be gpsd related
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Hi
The CSAC is not a cesium in the conventional sense. It is much closer to
a telecom Rb than anything else. There likely are telecom Rb’s that would
do a better job. Would they do a good enough job? …. likely not ….
Bob
> On Nov 27, 2021, at 5:11 PM, Lux, Jim wrote:
>
> On 11/27/21 12:37
Hi Jim,
Den 2021-11-28 kl. 01:26, skrev Lux, Jim:
Not only is the CSAC low power (~ 100 mW) it's physically small, which
is attractive for some applications (inside a cubesat, for instance).
It used to be price competitive with a Rb, too ($1000-1500, as I
recall) but now they're about $5k.
On 27/11/2021 15:22, Steven Sommars wrote:
FYI.
At 2021-11-27 00:00:00 UTC many public NTP servers began setting the leap
indicator to 1.
This may be gpsd related
Yes, I see it on [possibly] one of my ISP's servers:
cpc137586-lock4-2-0-cust263.6-1.cable.virginm.net
86.3.245.8
I wrote
On 11/27/21 7:33 AM, Andy Talbot wrote:
Just been reading your adventures with 3 Cs clocks, a mountain and 3 kids,
but I can't make the estimate of time dilation work out.
You measured ~ 23ns and say it agrees with calculation
The equation quoted in a related reference, for "low elevations" is
The International Earth Rotation Service (IERS) has declared that there will be
NO leap second in December 2021:
https://datacenter.iers.org/data/latestVersion/16_BULLETIN_C16.txt
https://www.usno.navy.mil/USNO/earth-orientation/leap-second-announcement
Erik
Sorry Andy, the latest IERS Bulletin C (
https://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat) specifically says
that there WON'T be a leap second this new-year.
Regards,
Peter Vince
On Sat, 27 Nov 2021 at 20:19, Andy Talbot wrote:
>
> A leap second is due 31 December. I'm
Hi,
There is an overemphasis on the atom being used, and especially on
cesium as that is what is used for SI definition. However, actual
implementation means actual physical devices, and the physical devices
have a physics package, for which details will be important to the
actual
Hi all,
this appears to be the explanation for the bogus leap second:
https://berthub.eu/articles/posts/leapseconds-expose-bugs-even-when-they-dont-happen/
Have fun,
Darren
On Sat, 2021-11-27 at 09:22 -0600, Steven Sommars wrote:
> FYI.
>
> At 2021-11-27 00:00:00 UTC many public NTP servers
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