Ah, Magnus, source of so much solid and useful information, I don't see
a time loop as valid.
Frequency, yes, social time, no.
A clock (purveyor of time) consists of an oscillator and a counter. In
olden times the oscillator was a pendulum and the counter was a set of
gears driven by the
Hi
Another counter argument against the “ratio mode” is that with zero current
through the wiper, odd things can happen. There is *always* something
else to consider in any real design.
Since they needed to calibrate the voltage swing, there aren’t a lot of options
with the technology they
On 8/29/15 7:19 PM, Alex Pummer wrote:
Hi Bob,
go to your local city library get membership[ here in California it is
free] , and ask them to get from the university library, it will take
some time than they cal you the your stuff is there, you could have it
for four weeks if you need you
We will have (literally) tons of free electronic parts and gear, plus some very
interesting Time Nuts goodies, including an assortment of time code displays,
counters, generators and converters left for just $25 ea. We even have some
giant 4 foot wide time displays, make your own mission
On Sunday, August 30, 2015 05:06:38 PM James Flynn wrote:
Martyn Smith martyn@... 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
In message 1698d85b-ebb6-45e3-9cb0-cbf780ce5...@n1k.org, Bob Camp writes:
Since they needed to calibrate the voltage swing, there aren’t a lot of options
with the technology they were using at the time. Today there are a lot more
choices of how to get this sort of job done.
It's not
Look at the service manual, the calibration setup listed is usually pretty
close to what Keysight is using in their local calibration facility. For an
LCR meter I doubt they would be using a time nuts grade counter
Content by Scott
Typos by Siri
On Aug 29, 2015, at 10:02 PM, Bob Camp
Bob,
agreed. But in the 5065A C-field circuit, the pot is wired as a variable
resistor.
The Bourns data sheets specifies +/- 50 ppm / deg C max.
Together with the two series resistors, the effective TC of the pot
drops to about 20 ppm.
That is indeed just 2 times more than the effective
Bill,
On 08/30/2015 07:45 AM, Bill Hawkins wrote:
Ah, Magnus, source of so much solid and useful information, I don't see
a time loop as valid.
Frequency, yes, social time, no.
You say social time, but I didn't, you extrapolated my words.
The main point of a Time Locked Loop is to use a
The is a publication by the NPL that talks about a similar technique, but
comes to a somewhat different conclusion.
http://publications.npl.co.uk/npl_web/pdf/mgpg68.pdf
Bottom line: it holds that the phase noise of all three sources can be
determined if they are taken two at a time; one
All,
I hope some more of you have had luck getting your REF-0s running
standalone.
My earlier write-ups were focused on the bare minimum connections and code
needed to make a REF-0 work. Of course, external connections are not ideal
for long-term operations. The real end-state here is to have a
Hi
As we go joyously bashing the poor guys that designed this beast, it’s worth
noting
just how old the design is. 741 op amps were indeed “modern” when they did much
of this and quite possibly to modern to be trusted. Most of the design would
have been
right at home in the late 1960’s at a
Poul-Henning,
On 08/30/2015 09:54 PM, Poul-Henning Kamp wrote:
In message 1698d85b-ebb6-45e3-9cb0-cbf780ce5...@n1k.org, Bob Camp writes:
Since they needed to calibrate the voltage swing, there aren’t a lot of options
with the technology they were using at the time. Today there are a
John,
On 08/31/2015 12:37 AM, John Miles wrote:
The is a publication by the NPL that talks about a similar technique, but
comes to a somewhat different conclusion.
http://publications.npl.co.uk/npl_web/pdf/mgpg68.pdf
Bottom line: it holds that the phase noise of all three sources can be
Hi Ulrich,
On 08/30/2015 09:58 PM, KA2WEU--- via time-nuts wrote:
This is the measured phase noise of the 10 MHz output. Not quite state of
the art but stable frequency .
Any other data of other oscillator available ? 73 de Ulrich
For the fun of it I did a few quick and dirty measurements
Hi,
I got at auction three CXR LARUS 54500-9 chassis.
They slots are empty – no cards included.
The chassis have two GPSDO slots and 13 others ???
The back panel has:
1. Two TNC antenna connectors
2. Three BNC connectors
a. 10 MHz
b. 1 PPS
c. IRIG-B
3. RJxx TCC/IP
4. A
On that note, did you look more closely on the NIST analysis of
cross-correlation and a possible cancellation and thus overly optimistic
results? Did it have any consequence on your code? What did you take
away from it?
Yes, you can definitely get divots in the PN trace, especially in
Hi John,
On 08/31/2015 05:12 AM, John Miles wrote:
On that note, did you look more closely on the NIST analysis of
cross-correlation and a possible cancellation and thus overly optimistic
results? Did it have any consequence on your code? What did you take
away from it?
Yes, you can
Bob,
Indeed. No bashing of the designer, it is an OK design for its age and
intended stability vs complexity. My point was that after the 702
design, many things happen and one thing they learned was to handle the
thermal balance. Already the 741 had taken a number of these steps. The
19 matches
Mail list logo
