Folks, thanks for your input and sanity checking. To recap...
Having never worked with crystals before (only 2 and 10 GHz stuff in
GaAs power amp RFIC design for cell phone and the like using lab RF
generators or Vitesse / AMCC asics with clock recovery already done by
someone/something
Hey Chris,
Thanks for the response... notes below
On Apr 23, 2009, at 12:19 AM, Chris Caudle wrote:
I'm a little late following up on this, but hopefully not too out of
context.
On Wed, April 8, 2009 10:23 pm, Chris Mack wrote:
The box / design of interest has ADCs, DACs, and a 38.88MHz
Firefox Tools-Clear Personal Data... You can even set it up to
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Firefox also has add-ins like ghost and UserAgent to allow you to
watch as you are being tracked by Google (through JavaScript)... Even
:
At 22:03 -0400 08-04-2009, Chris Mack / N1SKY wrote:
On Apr 8, 2009, at 8:50 PM, Bruce Griffiths wrote:
Chris
If you divide the output down to ~38MHz using a noiseless divider
then
the performance is 20dB or more worse than can be achieved with a
good
~38MHz crystal oscillator.
Ah
I am on the road right now, so I am not in front of it, but I have
the HandyScope HS3 100MHz USB which can run a strip chart recorder
for days / years if you like; depending on hard drive space. The
strip chart may be only available at lower speeds? I dunno... I
can't remember but
On Apr 8, 2009, at 11:59 PM, Tom Van Baak wrote:
The incoming clock source (master house clock) to this box / design
of interest is in another rack mount box external to this design on
the other side of the room and is anywhere from 44.1kHz up to a 10MHz
Rubidium (see also
into play here
as well
For the sampling application this is being used for, it would be
ideal (by design) to keep the timing uncertainty below 0.45ps or so...
Any thoughts?
Cheers,
-chris
N1SKY
--
Chris Mack
Electrical Engineer / RF Engineer / Software Engineer / Mastering
Engineer
a microprocessor (different from
what I need it to do of course since I already have an OCXO)
Harrumph
Cheers,
-chris
On Apr 8, 2009, at 5:09 PM, Magnus Danielson wrote:
Chris Mack / N1SKY skrev:
Hello fellow time nuts,
Have a project here with an OCXO from Vectron at 38.88MHz being
This is a good idea for testing..
Applying jitter frequencies for jitter tolerance testing is standard
stuff and needs to be done. Jitter tolerance curves match up with MTIE
tolerance curves very neatly.
Of course, here is the weird part... It's not SONET; but it is a chip
that can be
On Apr 8, 2009, at 8:02 PM, Bruce Griffiths wrote:
Unless you are prepared to place the crystals in an oven with the
temperature regulated tightly and carefully tune the filter
periodically
then using a crystal filter (or any passive filter with a sufficiently
narrow bandwidth to cleanup
On Apr 8, 2009, at 8:50 PM, Bruce Griffiths wrote:
Chris
If you divide the output down to ~38MHz using a noiseless divider then
the performance is 20dB or more worse than can be achieved with a good
~38MHz crystal oscillator.
Ah, this would work, but there is a synchronization aspect
at the
expense of long term drift and aging.
Achieving low jitter with such a source isn't difficult.
The other question that arises is why is the OCXO phase noise so
poor at
frequency offsets less than 12kHz?
Bruce
Chris Mack / N1SKY wrote:
On Apr 8, 2009, at 8:50 PM, Bruce Griffiths wrote
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