On Donnerstag, 21. April 2022 13:48:42 CEST Markus Kleinhenz via time-nuts
wrote:
> Hello Matthias,
>
> Could you explain further how enabled GLONASS messed things up for you?
Noticeably more transients in the phase error. Phase jumps of 15ns or more.
Since then I only enable GPS and Galileo, t
Private email from the folks at NRCan indicated that having both constellations
in the data would potentially result in (more) clock offset jumps in the PPP
results. Remember that GLONASS and GPS are synced to different master clocks
which are some small (and potentially variable) number of nan
I have yet to find a reliable source for this, but something I have heard in
the past is
that since the different constellations' satellites may be controlled and
disciplined
differently (and to different standards), it is not wise to use more than one
constellation
on receiver that is used to
Hello Matthias,
> Of course curiosity got the better of me. I switched the GPSDO to hold-over
> and recorded about 4000 seconds of data. Result is attached. BTW I terminated
> the experiment after the temperature compensation kicked the DAC one LSB
> down.
> I am quite pleased with the perform
On 4/16/22 15:53, Matthias Welwarsky wrote:
John, what constellations did you have enabled during the test? Just GPS, or
also others? I usually run with GPS and Galileo enabled (and I avoid GLONASS,
it messes everything up). Can this make a difference?
I'm afraid I'm not certain. Normally, I
Hi
Any time you look inside a control loop, there will be bumps and
the like that are a function of the control loop plus the dynamics
of the device being controlled plus the environment. If you have
a straight line … something is wrong.
Bob
> On Apr 16, 2022, at 1:20 PM, Matthias Welwarsky
Hi
> On Apr 16, 2022, at 11:55 AM, John Ackermann N8UR wrote:
>
>
>
> On 4/16/22 09:52, Matthias Welwarsky wrote:
>> Dear list members,
>> in 2020 John Ackermann published an evaluative survey of current day GPS and
>> GNSS receivers (URL below). I have a question about figure 26, which shows,
On Samstag, 16. April 2022 17:55:17 CEST John Ackermann N8UR wrote:
> Finally, it looks like you're comparing the raw PPS with an oscillator
> that is steered by that same PPS. I have to think their correlation
> could lead to possible and unpredictable errors. It would be better to
> have the
On 4/16/22 09:52, Matthias Welwarsky wrote:
Dear list members,
in 2020 John Ackermann published an evaluative survey of current day GPS and
GNSS receivers (URL below). I have a question about figure 26, which shows,
among others, the ADEV of a NEO-M8T against a Cesium reference, with
quantizat
Hello Matthias,
provided your OCXO is sufficiently stable, i.e., better stability than
the 1PPS, I agree that you should see said "bulge". Judging from the DAC
plot, the EFC voltage is being adjusted within the tau range in which
you expect the NEO-M8T bulge (10~100 s), so I'd expect that to h
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