Hi,
I just read [1] and stumbled over a small detail in figure 1, which
compares the stabilities of various frequency standards:
The stability of active hydrogen masers is higher than the passive
ones for short and medium term taus. But for long term, the active
maser has a higher variation than
If I may direct you to www.quartzlock.com and the online catalog, you will see
specifications of the small H Masers.
We have both in use.
Nicholai Demidov's paper at EFTF 2012 showed real results of a number of active
H maser's with drifts down to E-17 levels
One might ask when some benefit will
Hi
The Quartz Thermometer died when somebody proved that hysteresis was a big deal
on the probes.
Bob
On Dec 8, 2013, at 11:22 PM, Tim Shoppa wrote:
> Interestingly, HP for a long time sold"quartz thermometers" based around a
> probe with a quartz crystal with a well characterized linear temp
Attila,
That diagram looks outdated to me, by 20 to 40 years. See modern plots in:
http://tycho.usno.navy.mil/ptti/2004papers/paper38.pdf
The Long-Term Stability of the U.S. Naval Observatory's Masers
http://www.ptfinc.com/dsheets/CH1_75A.pdf
CH1-75 Active Hydrogen Maser
http://www.ptfinc.com/d
It´s still used in the oil industry as "the standard" for temp and
pressure monitoring...
Daniel
Em 09/12/2013 10:28, Bob Camp escreveu:
Hi
The Quartz Thermometer died when somebody proved that hysteresis was a big deal
on the probes.
Bob
On Dec 8, 2013, at 11:22 PM, Tim Shoppa wrote:
On 12/9/13 6:12 AM, Daniel Mendes wrote:
It´s still used in the oil industry as "the standard" for temp and
pressure monitoring...
Probably because they're an inherently rugged sensor
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> Any pointers re suitable instruments to accomplish this that can be sourced
> via the usual surplus sources would be welcome.
>
> Thanks in advance
> Mark Spencer
Hi Mark,
Here's a list of the thermometers I use:
- Vintage hp 2804. Still my favorite, high-resolution thermometer. I use it in
Is the hysteresis related to the retrace effect? If so, then I think
that the quartz thermometer may be succesfully used where the
tenperature has only small variations.
On Mon, Dec 9, 2013 at 3:12 PM, Daniel Mendes wrote:
>
> It´s still used in the oil industry as "the standard" for temp and pre
10 MHz 6 output amps, 1 input amp. Matches 5061A Cs standard.
fs, contact me off list please.
Don
--
"The power of accurate observation is commonly called cynicism by those
who have not got it."
-George Bernard Shaw
--
Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
POB 134
Huson, M
Is this a rebadged 5087A?
-John
> 10 MHz 6 output amps, 1 input amp. Matches 5061A Cs standard.
> fs, contact me off list please.
> Don
> --
> "The power of accurate observation is commonly called cynicism by those
> who have not got it."
> -George Bernard Shaw
> --
> Dr. Don Lath
HI
The one currently in use is a *very* different animal than the HP version.
Bob
On Dec 9, 2013, at 9:12 AM, Daniel Mendes wrote:
>
> It´s still used in the oil industry as "the standard" for temp and pressure
> monitoring...
>
> Daniel
>
> Em 09/12/2013 10:28, Bob Camp escreveu:
>> Hi
>
Hi
The way it was spec’d by HP, there was no allowance for hysteresis. They also
had some issues with probe drift / calibration costs. They apparently decided
to drop the product rather than update it.
Bob
On Dec 9, 2013, at 9:41 AM, Azelio Boriani wrote:
> Is the hysteresis related to the r
Sort of, John. The amplifier modules are not the same, but the chassis
is very similar.
Don
J. Forster
> Is this a rebadged 5087A?
>
> -John
>
>
>
>
>> 10 MHz 6 output amps, 1 input amp. Matches 5061A Cs standard.
>> fs, contact me off list please.
>> Don
>> --
>> "The power of accura
I got a GPS Source splitter recently and since my little Adafruit doesn't have
enough power to run it I got an MS3016R connector to hook up external power.
What I can't figure out is what is that blue plastic pin for that comes in the
package?
Bob - AE6RV
__
Hi:
The Wiki page for the Shortt pendulum clock has a "Recent Measurements" (1984)
paragraph that's in error.
http://en.wikipedia.org/wiki/Shortt-Synchronome_clock#Recent_accuracy_measurement
While it's probably true that the clock is stable to 200 uS per day (i.e. 2E-9) I believe Alfred Loomi
I thought I needed to throw this in the mix.
http://www.allanstime.com/Research/Pendulum/index.html
Enjoy.
Thomas Knox
> Date: Mon, 9 Dec 2013 17:02:22 -0800
> From: bro...@pacific.net
> To: time-nuts@febo.com
> Subject: [time-nuts] Shortt Clock Recent Measurements
>
> Hi:
>
> The Wiki page
If the contacts are loose and individually extractable/insertable, the pin
is probably a dummy pin to substitute for the more expensive brass/gold
pins. This is so the rubber does not distorted over time.
-John
=
> I got a GPS Source splitter recently and since my little Adafruit doe
Brooke,
Not sure what you find in error; please explain.
I have all the Shortt info you need. Not all of it is for Wikipedia; contact me
off-line.
Just got back from the CalTech
Time Symposium:
http://leapsecond.com/nawcc2013/
The conjecture about tides is explained in great detail here:
http:
Take a look at ebay auction 261315795465. It's a mil-spec connector and I
don't see any way for the connector pins to come out. It looks like it's
probably pressure tight. You can see the blue plastic pin in the third
picture. It's almost like it has something to do with the rubber strain
r
It's what I said. A blanking pin for the hole in the rubber seal, except
that it's only for the seal, not the whole connector.
-John
> Take a look at ebay auction 261315795465. It's a mil-spec connector and I
> don't see any way for the connector pins to come out. It looks li
That is a dummy pin to seal a position in the connector that does not
have a pin.
If all of the pins are installed it is not used.
73
Glenn
WB4UIV
At 07:13 PM 12/9/2013, you wrote:
I got a GPS Source splitter recently and since my little Adafruit
doesn't have enough power to run it I got an M
OK, now it makes sense!
thanks!
Bob
>
> From: J. Forster
>To: Bob Stewart ; Discussion of precise time and frequency
>measurement
>Sent: Monday, December 9, 2013 8:58 PM
>Subject: Re: [time-nuts] MS3106R10SL-4S connector question
>
>
>It's what I said. A
the ones I have seen take the place of a crimp pin to be inserted
into the connector to maintain moisture integrity.
With the length, it looks like it would take the place of a wire in
the water seal / strain relief, if only one wire were to be used.
73
Glenn
Never seen one like that before,
A
Hi Tom:
The way I read the comment about detecting the influence of the Moon was that it was discovered in 1984, but I was under
the impression that Loomis found it long before.
I looked on other Wiki pages and did not see on any of the them information about Loomis and the effect of the Moon on
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