ble operation by the world around them, I'm just not hearing
> those stories
> from a lot of people using them (GPS receivers).
Spectrum allocation is controlled reasonably tightly. If there were
widespread problems due to increased EMI then you would know relatively
quickly from the n
ure, and the
output is 0V DC at that point, but any instantaneous phase offset (i.e.
phase noise from reference and DUT) shows up as AC signal at the output.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to t
ceiver to see
if the GPS is receiving enough satellite. That is 9600 baud serial text,
so a microcontroller can do it.
Paul's recommendation for checking whether the PLL is locked is really
only useful after you know that the signal you are tracking is actually
rbolt, and one Jackson Labs it
should at least be possible to tease out what behavior is unique to the
new STM32 device.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an
email to time-nuts-le...@l
The datasheet for the PIC12F675 says absolute maximum input voltage on the
pins is VDD + 0.3V, so no, you should not use a 5V signal when running
from 3.3V. You could power the PICDIV from 5V, and divide down at the
output of the PIC rather than the input.
But you may not need to, depending on the re
for a long time:
http://www.resonal.com/Downloads/John%20R.%20Vig%20-%20tutorial%20on%20Quartz%20Crystals%20and%20Oscillators.pdf
(apologies if my mail editor mangles that link, hopefully you can put it
back together successfully if that is the case).
--
Chris Caudle
ard they should be good performance. I
haven't measured the performance of the UARTs in super IO chips. Those
would share the upstream connection with a lot of other things, so
might vary in latency.
-- Chris Caudle
___
time-nuts mailing list -- t
seems to be a regression rather than a problem left uncorrected since
2013.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an
email to time-nuts-le...@lists.febo.com
To unsubscribe, go to and follow the instructions there.
egrees.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an
email to time-nuts-le...@lists.febo.com
To unsubscribe, go to and follow the instructions there.
mand line
options? Many people on the list use Lady Heather, a screen capture of
the output you are seeing may have enough information for someone to help
diagnose.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubsc
just a value returned directly from the GPS receiver that is displayed and
reported by LH. There is no algorithm involved.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an
email to time-nuts-le...@li
2K isn't exactly what I
think of when I hear "oven" so presumably there is some mode that works
at around 300K that I didn't find discussed yet.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscri
with a digital display.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
amplifier was damaged, but I've never looked into how difficult that
would be to change. Hopefully just a damaged antenna from a summer
thunderstorm or similar.
-- Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe
ct the cable shield from the enclosure, you make an antenna to
pass external RF into the interior of your enclosure. Changing to a
plastic enclosure might not be much worse from an RFI/EMI standpoint.
--
Chris Caudle
___
time-nuts mailing list --
tput.
I am not familiar with the internal design of the 105 oscillator, I know
several here are so I will let someone else comment on likely source of
the 10kHz and 100kHz you saw.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To
in the deep sub-Hz region
that you say you are interested in.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
low cost quartz OCXO (or maybe even TCXO if
the accuracy meets your needs in your lab environment, i.e. I don't expect
your lab will vary much more than 10C to 30C even if you were to leave the
house for a couple of weeks).
--
Chris Caudle
___
time-nu
ctrolytic
that is close enough to the same size that you can get it soldered on.
The polymer aluminum (should) have longer life than the traditional liquid
electrolyte aluminum electrolytic caps.
--
Chris Caudle
___
time-nuts mailing list --
> the variation in pulse positions with respect to a jitter-free waveform?
See the document linked above, there are various distinctions made to what
and how you measure the period based on how the clock is being used or
what particular beha
40V loads).
With that design I would expect there to only be as much difference
between the two legs as you have difference in loading between the two
halves of the transformer winding, since they share a common primary.
--
Chris Caudle
___
time-n
On Mon, February 24, 2020 7:15 pm, Gary E. Miller via time-nuts wrote:
> The words "decimate" and "decimation" do not apear in that book.
That is not correct, the term appears in chapter 3:
"...a procedure called decimation."
http://www.dspguid
ate.
I don't have a firm grasp on the mathematics of how this translates into
the final ADEV values, but I can't imagine that aliases are going to
improve the quality of the data.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.fe
tem involves transferring timestamps between NIC clock and system
clock, so if both of those clocks are low drift it can simplify keeping
the system and NIC clocks synchronized.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.
can read data from an EEPROM, that
aspect will be nearly trivial, the trouble is usually interpreting the raw
data, or filling in any data which has degraded over time and can no
longer be read.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@
ciplined in any way as stand alone devices, but can be used as part of
a full GPS disciplined oscillator design. The SA.22C has a
pulse-per-second (PPS) input, so it can be connected to GPS, but that gets
into a lot of secondary questions relating to how that PPS is derived and
whe
tive though. Think of it more like the average error
from "true" GPS time when averaged over an hour, and GPS time should be
within some small number of nanoseconds of "true" UTC essentially always.
--
Chris Caudle
___
gt; they had developed.
Seems to be basically the same design as Trimble Thunderbolt.
I found an old press release which stated that u-blox bought the assets in
2011, so if u-blox does not have a module which does the same by this
point I have to think they decided it was not worth the ef
ogrammed by using a 3-wire
serial interface. With a 0.25ns step size, the DS1124 can provide a delay
time from 20ns up to 84ns with an integral nonlinearity of ±3ns. "
Small package, would be a little difficult to prototype by hand, but not
impossi
x.html
"the new clock-electronics uses exactly 1 Watt of power"
It uses 5MHz and PPS in, so I'm not following how Corby says it just needs
PPS in. Is the 5MHz input something PHK added to his replacement which
was not on the original?
--
Chris Caudle
On Mon, January 28, 2019 4:15 pm, Chris Caudle wrote:
> PHK's replacement 5065 clock should not pull much power:
> http://phk.freebsd.dk/hacks/HP5065A/20160112_working_clock/index.html
Although after re-reading the description more closely I do not think that
is exactly what you are l
source.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
understanding of aging process in MEMS based oscillators, so I
don't know how much faith to put in low aging claims yet. ADEV is quoted
as "2e-11 ADEV at 10 sec under airflow."
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@list
oal of measuring vs. frequency, so at some point after
verifying the setup basics you will have to go back to narrow band
signals.
A 5370 is a somewhat coarse instrument for this type of measurement, a VNA
which has a suitable lower measurement frequency would probably be more
suitable
d
access to the GPS hardware and firmware at a very low level to make that
work, I don't think you can do that trick with off the shelf GPS hardware,
which I assume is why only Trimble has done it.
--
Chris Caudle
___
time-nuts mailing list -- time-
y the GPS receiver,
but with lower jitter.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
ntrolled slew on the output of the PLL so that there is no sudden phase
jump when the reference clock goes away.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_l
teresting as an example if nothing
else.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
as
useful for synchronizing to PPS was interesting.
--
Chris Caudle
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
39 matches
Mail list logo
