Richard (Rick) Karlquist writes:
> The last thing you want in an oven is a lot of
> added thermal overhead, especially in a double oven
> where you already fighting against running out of
> temperature range. If you want to ovenize everything
> but the kitchen sink, put it in it's own oven that
Hal Murray writes:
> That still leaves the temperature quirks of the DAC and amplifiers.
>
> Has anybody put the DAC and all of the analog stuff inside the oven?
Seems
> like an obvious idea so somebody has probably patented it.
>
I am using a 5 MHz custom built design which has everything
writes:
> I also have a weather station at 6 km distance away, which records
barometric pressure at time intervals of
> 10 minutes. Out from these measurements, I divided
> my phase measurements into 10 minute intervals, calculated the 10 min
average frequencies and made a
> linear regression
Belinda,
It is often good to ask such questions. So, please do not apologize.
Accuracy is defined as how close a claimed parameter of a device or
system (frequency, time, etc.) is to a standard. This claim has to be
supported by measurements made to a certain precision, (there's that
other w
writes:
>
> I noticed that NIST, at http://nist.time.gov/ , is still sending
standard time. When do they change?
>
> John WA4WDL
>
>
As of 1849Z it was reporting DST.
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le the proof-of-concept system is not being used for a refclock for
NTP, it is able to keep time as described above and FREQUENCY to the under
1 E-10 range. I am still working to improve that and hope to verify it in
a way directly traceable to NIST.
James Flynn
California State Univer
Rob S. writes:
>
> Around 1/2 an hour ago ( I wasn't in front of mine when it happened ) at
> roughly 00:45 UTC the Mates went into "holdover" mode and reported "no
> Sats". I have just checked mine and it is reporting the same..
>
At about 0045 Z 14FEB16 my Navman TU60 (surplus), which I run
James Flynn writes:
>
> I am away from experiment at moment, but what I could check remotely
> indicated everything was running hot, straight and normal.
>
> I will check it again when I get back and put up data.
>
> I have not seen this before but was not runni
Hal Murray writes:
>
> What sort of gear did that? Was it a GPSDO that went into holdover?
Has it
> gone into holdover at other times?
>
I am running a proof of constant test bed comparing time/transfer method
using another medium with simple GPS time receiver. I have a disciplined
dou
I recorded apparent anomalous activity on the GPS signal received near Los
Angeles from about 0200Z to 0500Z 30 Sept. The 1PPS received signal
shifted by -2E-10 in frequency (5 minute averages).
There is a notice on the GPS website about possible interference today (29
Sept) through 30 Sept in
Bob Benward writes:
>
> Continuing this discussion, I have included a PDF showing the past
30days of
> EFC. Amazingly, the drift has reversed direction! Anyone have any
insights
> into this behavior? Each data point represents 10 seconds.
>
I have found that three things can cause this be
Martyn Smith writes:
> MEASUREMENT TECHNIQUE
>
> We have three sources close in frequency (within 1 x 10E-8 of each
other).
>
> Two sources are connected to the Ch0 and Ch 2 inputs of the timepod, the
> unit under test to the ref input.
>
> According to John, the result will be the actual p
Hal Murray writes:
> > Also the carbon composition resistor drifted with time at elevated
> > temperature.
>
> I assume the drift is slow enough so that any any control loop will
easily
> track it.
Actually, "ageing" is a better word than "drift". After the major change
in resistance due to
In the world of time nuts, little things matter. Nanoseconds are an
eternity. We rip our hair out (if we have any left) over 1E-11 errors,
weep over phase noise and shriek about Allen deviations, modified or
otherwise.
The question is: just where are the little things?
If you are new at this,
Scott Newell writes:
>
> My linux parallel port WWVB 'scope got a bit confused at the leap
second:
>
>
I have coded a WWVB receiver according to the published standard. It is
all homebrew with an embedded processor and disciplined OXCO.
I did not do any display shots (didn't think anyone wo
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