Hi Javier,
As far as I understand in WR both references are synchronous. Why don't you
try to track both references (or N references) simultanously? If you take
care of the design, your performance should increase while locked and the
transition from one reference to the other if you ever miss
This is a great list. Thanks everyone! Much of the material relates to
cases where good holdover needs to be maintained for several hours,
but there's a lot of insight to be gained from the reading, and I am
sure those techniques will come in handy for other projects. Thanks
again!
Javier
On
You may find the following Master's thesis useful:
http://www.ko4bb.com/manuals/download.php?file=08_Stuff_Not_Sorted/8_Sept_28_2014_Uploads/Adaptive_OCXO_drift_correction_thesis_Zhou_2009.pdf
Best regards,
Charles
___
time-nuts mailing list --
The state of the art 20 years ago is described here:
http://www.hpl.hp.com/hpjournal/96dec/dec96a9.pdf
They understood their OCXO very very well. And you can find EFC trends on
the web for hundreds of different Z3801A's (and similar) if you want to see
how the EFC trends (and occasionally jumps).
On Fri, 6 Feb 2015 10:21:08 +0100
Javier Serrano javier.serrano.par...@gmail.com wrote:
We would like to start working on holdover performance for White
Rabbit [1]. This is a new domain for us. Our main use case is a WR
switch losing its reference because someone disconnects a fiber. We
can
Javier,
If you are aim to do hold-over as you switch between two sources, you
are looking at reasonably short times, then just keep a fixed voltage to
the oscillator suffice.
Even if you need a little longer times, say 10-20 s, it suffice.
Temperature changes and oscillator drift may be the
On 2/6/15 1:21 AM, Javier Serrano wrote:
Dear all,
We would like to start working on holdover performance for White
Rabbit [1]. This is a new domain for us. Our main use case is a WR
switch losing its reference because someone disconnects a fiber. We
can have redundancy, but it will take some
Thanks for your ideas.
On Fri, Feb 6, 2015 at 11:09 AM, Hal Murray hmur...@megapathdsl.net wrote:
Is your PLL analog or digital? I'll assume digital since it's hard to hold
analog voltages stable for several seconds.
Yes, it is digital. It's even software. It runs on an LM32 [1] soft
core
javier.serrano.par...@gmail.com said:
We have never worked on holdover, and I am wondering if we can do something
smarter than the obvious feeding of some constant voltage to the VCXO, based
on averaging during the locked state. Does anybody know of any good
references on holdover?
I doubt
