I have a Science subscription so can read the complete paper and
supplementary material. Their current device has about two orders of
magnitude greater linewidth (34 kHz) than the ~400 Hz linewidth
predicted from maser theory. The coherence time is ~9.4 us. They suggest
this is due to charge
On 1/25/15 1:30 PM, WarrenS via time-nuts wrote:
I second Poul-Henning Kamp's comments concerning D-terms,
(mostly) as done in the TBolt and likely other GPSDOs.
Bear in mind that a PID loop is basically a fairly simple control loop
that is easily susceptible to linear analysis.
They're
On 25 Jan 2015 23:02, Tom Van Baak t...@leapsecond.com wrote:
You're getting 1e-12 at 1 second. Sounds fine to me.
Obviously you have the experience to know that 1e-12 at 1 second is fine.
But if it's possible, I would like to understand the relationship between
the counters specification and
Another unique thing about the TBolt engine is how fast it can calculate a
Freq change in its 10MHz osc.
Over short times periods, it can be 100 times better than a standard 1PPS
GPS engine.
It would be interesting to compare it to a high end dual freq GPS.
With the Tbolt in manual hold over
Odd indeed. My LTE-lite is one second late, appears to have already added the
pending leap second.
I can compare with four other GPS timeing receivers using time pulse on DCD
line. The NMEA data
reports in error. I am awaiting reply from JL. This is not good for an eBay
sniper
Bill,
Maybe we are getting a little off-topic here, but a very long time ago I
was dealing with industrial ovens used to braze ceramics used to make
microwave tubes.
It was very difficult to maintain the precise temperature ramp up and down,
particularly as the oven was not always loaded the same way.
Hi Time Nuts
This is my first posting on Time-Nuts though I've been reading others postings
for quite a while.
I am thinking of upgrading my very basic counter but only have limited lab
space which rules out the SRS 620 on the basis of physical size.
Tektronix are offering an ex demo FCA3100
On 1/26/15 5:55 AM, Poul-Henning Kamp wrote:
In message 54c5a270.7090...@earthlink.net, Jim Lux writes:
And there's decades, if not centuries, of experience with P, PI and PID
controllers in a practical sense.
Not quite a century I belive: Only the advent of electronics formalized
We have confirmed this issue with the Skytraq firmware on the LTE-Lite and
are working with Skytraq to obtain a firmware update. I will post again
when a firmware update is available.
Keith
Keith
On Sun, Jan 25, 2015 at 5:47 PM, Bill Beam wb...@gci.net wrote:
Odd indeed. My LTE-lite is one
The performance of the 2 systems should be comparable provided the similar
equivalent noise bandwidths are used.Every 10Mhz edge needs to be timestamped
with ps resolution and the resulting phase samples low pass filtered and
decimated to achieve this.The 10MSPS picosecond or better resolution
I do understand.
Has anyone already compared the performances of squaring the 10 MHz vs squaring
the IF ?
Stephane
-Message d'origine-
De : time-nuts [mailto:time-nuts-boun...@febo.com] De la part de Bob Camp
Envoyé : dimanche 25 janvier 2015 19:01
À : Discussion of precise time and
Skytraq has also confirmed the issue and is working on a firmware update.
Updating the Skytraq firmware on the LTE-Lite Eval Board requires the unit
be returned to Jackson Labs for reprogramming. We will update the Skytraq
firmware on units at no charge if units are returned to us. Please
Be careful with 'eyeball data'. GPS receiver does not generate NMEA time data
and the leading edge of PPS at the same time.
Programs like Tac32 (totally accurate clock) and Lady Heather increment the
time display at the leading edge of PPS with a
value 1 second greater than the previous NMEA
In message 5E5E892CF8A2440FBF18FFAD000B65FD@NewComputer, Lee Mushel writes:
I'm fairly sure that Jim is right. I never had to worry about PID machine
control before the late sixties and by the mid-seventies the concepts were
firmly in place and in use.
The basic math of PID has been
Yes there is certainly an error here:
With my timing module I was just eyeballing the output on a windows platform ,
comparing GUI data.
I have just linked the module up to a BeagleBone Black sync’d with NTP and this
is the NMEA msg log:
root@bb3:/home/mike/serial-ports# while read GGA; do echo
In message CAMQqFumOdB4gcFfQjQ_nced0C_U=fbmyofwl7vuxm8wotqg...@mail.gmail.com
, Didier Juges writes:
In order to automatically compensate for different oven loading (and
ambient conditions), the controller injected a very low level random
noise over the temperature setting and by
I'm fairly sure that Jim is right. I never had to worry about PID machine
control before the late sixties and by the mid-seventies the concepts were
firmly in place and in use. It certainly was the appearance of solid state
industrial controls which made it all possible. And those ideas
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