RRR . you are right about drop and noise..
For others not familiar with this behaviour, one thing when looking is
PSRR etc on LDOs..take a good look at this value VERSUS dropout /
headroom . Most devices are in the toilet when dropout is nigh... In my
SDRs I (used) to run 2V around for 1.8V
On 7/8/19 7:05 PM, Dana Whitlow wrote:
I'm surprised that the VF of HV transmission lines is noticeably less than
unity, given
that the dielectric is just air. Or does the distributed resistance do all
the damage?
It's all about L and C that creates the delay - propagation constant is
One what? I see that it is a Ublox unit, but see no reference to the
interesting
modern units like the 9 series. Also, I note that the only reference on
the board
to "ant" is on the lower right corner, while what I suppose to be the
actual antenna
connector appears to be an SMA near the upper
I'm surprised that the VF of HV transmission lines is noticeably less than
unity, given
that the dielectric is just air. Or does the distributed resistance do all
the damage?
Dana
On Mon, Jul 8, 2019 at 8:00 PM jimlux wrote:
> On 7/8/19 3:11 PM, Hal Murray wrote:
> >
> >
Long winded answer to your question:
I'm sort of an "Advanced beginner" time-nut or maybe a bit beyond that.
In relation to your question: It really depends on your goals. The
following is a high level overview of your options, and is intentionally
lacking and/or simplifying some details.
On 7/8/19 4:53 PM, Richard (Rick) Karlquist wrote:
On 7/8/2019 11:09 AM, jimlux wrote:
Not only are they low noise, but they have spectacularly good HF
rejection across the regulator up to 10s of MHz.
In the 5071A, I wanted high bandwidth PSRR and stumbled across
a designer's manual
On 7/8/2019 11:09 AM, jimlux wrote:
Not only are they low noise, but they have spectacularly good HF
rejection across the regulator up to 10s of MHz.
In the 5071A, I wanted high bandwidth PSRR and stumbled across
a designer's manual (HP internal document) for the MMS Modular
On 7/8/19 3:11 PM, Hal Murray wrote:
glenl...@pacificmedia.com.au said:
I think people getting confused with the phase of measured current to the
voltage .
No, we have been discussion the phase angle between 2 geographically separated
locations connected by a power line.
Consider the
Well now you can see one
Bert Kehren
In a message dated 7/8/2019 7:02:07 PM Eastern Standard Time,
hol...@hotmail.com writes:
A big issue with using the sawtooth correction message from a GPS receivers is
the issue of just what that sawtooth value is related to and how to apply it to
the
glenl...@pacificmedia.com.au said:
> I think people getting confused with the phase of measured current to the
> voltage .
No, we have been discussion the phase angle between 2 geographically separated
locations connected by a power line.
Consider the simple case of a generator, 100 miles
A big issue with using the sawtooth correction message from a GPS receivers is
the issue of just what that sawtooth value is related to and how to apply it to
the measured PPS value / phase.
I added the ability to Lady Heather to calculate a sawtooth corrected "paper
clock" by applying the
OK so I have the NGOCOMM program for the E1938A.
I see looking at the DLLs it was written in Borland OWL.
Does anyone have the C++ source code, or know what is in it ,
and also does anyone know exactly what is in the E2PROM?
all this for extending the MAINTAINABLE life of these excellent
The model of H Maser is KVARZ: CH1-75A.
Thank you for the replies friends! Soon here in the lab we will start to
discuss the maintenance.
Best regards
Luiz
Em sáb, 6 de jul de 2019 às 22:01, Jim Palfreyman
escreveu:
> Hi Luis,
>
> I have experience with the NASA NR series if that’s what you
with regard to phase angle and confusion over load and power flow ...
I think people getting confused with the phase of measured current to
the voltage .
the voltage phase is fixed, and should be consistent . when you measure
the current phase, relatve to the voltage, that tells you about
Hi
Whatever they are doing to create an output is being done modulo the internal
TCXO period.
That gets you down to a +/- 4 ns error on either the F9T or the F9P. They can
do that however
often they like, it’s still a very coarse correction as far as I’m concerned.
What matters is how
Hi, I'm extremely new to the topics covered on this list, but am finding
reading the message traffic to be highly educational. I have some
questions that I'd like to put out, and apologize in advance for them
being at a greatly simpler level than most of the discussion here.
I came to
s...@eskimo.com said:
> My specific question concerns the case that one of the boxes is a computer,
> for example, a Linux box with time kept using ntpd or chrony (perhaps also
> listening to a PPS signal coming in on a serial port). But I've never seen a
> computer with a PPS *output*.
There
From: Steve Summit
[]
My specific question concerns the case that one of the boxes is
a computer, for example, a Linux box with time kept using ntpd
or chrony (perhaps also listening to a PPS signal coming in on a
serial port). But I've never seen a computer with a PPS *output*.
On 7/8/19 8:38 AM, Richard (Rick) Karlquist wrote:
Regarding the E1938A schematic:
Although not references per se, the LT3042/LT3045/LT3045-1
are extremely low noise voltage regulators. Actually,
if there are any time nuts who haven't yet heard of these,
the data sheets should be considered
Several comments:
What level of accuracy do you mean by "synchronized"?
Plotting a lightly loaded Linux box, which is extracting time from the
network via timesyncd, against a GPS 1PPS signal, I observe typical time
excursions within +/- 10 ms, and extreme excursions over a 24 hour period
of up
Steve,
I'm curious: in the absence of a PPS or other electrical output from your
"computer",
what is the nature of the time "output "? If it's just visual via a
display, why not view
the light output of the seconds digit with a photocell. Most of the
transitions should
produce an
Regarding the E1938A schematic:
I will try to answer your questions when I have time.
Watch this reflector.
The story on the voltage reference is:
The original part I chose turned out to be too noisy.
I selected a different, quieter part for the final
design. I don't remember the MPN's of
Andy, it appears to me that the FNET/GridEye system already does what you
propose:
http://fnetpublic.utk.edu
The Angle Contour Map displays the kind of results you desire. But it doesn't
know the Western Interconnection at this time. I believe there is a typo at the
top of the Angle Contour
This is a different sort of question than what seems to be
discussed here usually, and I apologize if it's wholly off-topic,
but I'm guessing there are some time nuts here who might be able
to give me some pointers.
If I have two boxes with clocks that are supposed to be perfectly
synchronized,
Bob, what are you calling "time correction"?
You are now quoting F9T which is not the product original statement related to
(F9P.)
If you refer to internal Ublox adjustment of instantaneous timepulse train then
it is performed at navigation rate - up to 20Hz on F9P.
F9P's rate of TP can be set
> I hope some will accept the technical challenge of gathering data --
which is fairly minimal.
Andy,
It may have been before you joined time-nuts, but some years ago we
compared mains phase/frequency between Albuquerque, NM and Seattle, WA,
which in spite of being some 1500 miles apart are
I have been collecting data previously at a one second interval for a
duration of 24 hours for my RFS. What are the potential "gotchas", if
any, for a .1 second interval for say 6 hours?
Will going to a shorter sample interval skew the results I have been
seeing previously with the one second
Hi Glen,
You're welcome.
Nothing wrong with the modules, I just like to well-document my hobbyprojects.
I'm a bit crazy...
Still some open ends that I would like to understand and update my drawings
afterwards (and post the final versions).
Maybe one of you guys knows how it's built, or maybe
The message that the TrueTime/Symmetricom FTM-III power line monitor card for
the XL/XLi receivers contains:
A time error (number of accumulated seconds of error based upon the line
frequency)
The current frequency error from nominal 50/60 Hz
The current measured line frequency (0.001 Hz
To clarify:
My research proposal is for data to be taken within the same interconnection.
It does not care about frequency.
It does not care about Time Error.
It only seeks to characterize the phase differences between the power line
signal presented in regions of the distribution system
I have here a pair of instruments that were part of a system used at one time
in a power station here in NZ to control the time error in one part of the
national grid. It controlled the selected generators and provided a real time
display of the time error between a reference standard and
Since the direction of power flow depends on the phase angle between the
synchronous source and load, it seems to me that the difference between the
average phase angle in one region and that in another (at the ends of a DC
transmission line) will tell you which way power is flowing. I didn't
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