Hi guys,
my apologies for the commercial part in the email.
Does anyone have information on the typical g-sensitivity of
crystals/oscillators? We see about 1 to 2E-09 frequency change when turning
typical OCXO's
around on their back (a 2g turn-over).
We introduced a low-g GPSDO that is
My HP5334B tabs look like this with a 1 3/4 inch seperation for the case holes
and the same for the rack mount.
http://i307.photobucket.com/albums/nn306/stanleyreynolds/hp1.jpg
http://i307.photobucket.com/albums/nn306/stanleyreynolds/hp2.jpg
a
A normal OCXO would drift significantly when being turned around in any
direction.
I've actually been wondering about what physical mechanism that causes
this. I could understand how it could cause a phase shift, but I
can't envision the cause of frequency shift. Does anyone know?
Matt
My HP5334B tabs look like this with a 1 3/4 inch seperation for the case holes
and the same for the rack mount.
http://i307.photobucket.com/albums/nn306/stanleyreynolds/hp1.jpg
http://i307.photobucket.com/albums/nn306/stanleyreynolds/hp2.jpg
On Thu, 2008-06-05 at 13:02 -0400, [EMAIL PROTECTED] wrote:
...
I am very interested to see what experience folks have with low-g crystals
and OCXO's.
Does anyone have experience with using active Crystal compensation for
varying g-vectors? How about special crystals, or
Correction my counter is a HP5334A not B sorry don't know if they are different.
- Original Message
From: Stanley Reynolds [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Thursday, June 5, 2008 12:27:15 PM
Subject: [time-nuts] Fw: HP 5334B rackmount ears
My HP5334B tabs look like this
I've got some presentations on low-g OCXOs technology - I'll dig them out
and send you a copy. Gives quite a bit of theory and also techniques for
correcting g effects.
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Matt Ettus
Sent: 05
Said,
See my post to Matt. I have some useful info on g correction techniques.
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of [EMAIL PROTECTED]
Sent: 05 June 2008 18:02
To: time-nuts@febo.com
Subject: [time-nuts] low-g OCXO GPSDO
Hi
The ears I have should be the same as the one on the right side in the
hp2.jpg, except for the 1 spacing.
-Dave
-- Original message --
From: Stanley Reynolds [EMAIL PROTECTED]
Correction my counter is a HP5334A not B sorry don't know if they are
different.
Hi Bjoern,
thanks for the pointer.
Unfortunately they only say FEI propriatary compensation techniques
without going into details.
I am interested in the details :)
I am wondering if we can get down to 1 to 5E-012/g in an inexpensive way
without using accelerometers etc.
thanks,
bye,
Hi Gang!
Being the season of thunderstorms and protracted power outages;
As my UPS quit before the power restored, I am reminded of a behavior
that I have always found curious:
When the power fails on my Sulzer 2.5A, for more than a few minutes,
the frequency takes a quick hop lower a few parts
Cool!
Thanks everyone for your feedback,
bye,
Said
In a message dated 6/5/2008 11:08:07 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
I've got some presentations on low-g OCXOs technology - I'll dig them out
and send you a copy. Gives quite a bit of theory and also techniques for
The PDF link listed by Björn below actually supersedes the ones I have on
file, so please ignore my previous posts.
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Björn Gabrielsson
Sent: 05 June 2008 18:38
To: Discussion of precise time
They use accelerometers and were getting better than 2E-12/g in 2004 but
I've been a bit out of touch since then
Rob K
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of [EMAIL PROTECTED]
Sent: 05 June 2008 19:20
To: time-nuts@febo.com
Subject: Re:
From: Matt Ettus [EMAIL PROTECTED]
Subject: Re: [time-nuts] low-g OCXO GPSDO
Date: Thu, 5 Jun 2008 10:25:43 -0700
Message-ID: [EMAIL PROTECTED]
A normal OCXO would drift significantly when being turned around in any
direction.
I've actually been wondering about what physical mechanism that
Hi Rob,
there are unit out there that are not accelerometer compensated, and do
extremely well too. But I think these are selected quartz crystals, with quite
low yield and thus quite high cost..
We are looking for the holy grail: low cost and complexity, and very high
performance.
On Thu, 2008-06-05 at 14:58 -0400, [EMAIL PROTECTED] wrote:
We are looking for the holy grail: low cost and complexity, and very high
performance.
Maybe accelerometers are a must.
They are not that expensive anymore.
ADXL330 (3 axis +-3g analog) seems to be below $6.
bye,
Said
From: Matt Ettus [EMAIL PROTECTED]
Subject: Re: [time-nuts] low-g OCXO GPSDO
Date: Thu, 5 Jun 2008 10:25:43 -0700
Message-ID: [EMAIL PROTECTED]
A normal OCXO would drift significantly when being turned
around in any
direction.
I've actually been wondering about what physical
In message [EMAIL PROTECTED], John Miles writes:
Anything that deforms the actual crystal will slightly change the
acoustical
waveequation and thus the frequency. Crystals also deforms due to
electrostatics, which have been used by NIST for finegrained
phase modulation.
I wonder what would
Hmm, that's not a bad price at all.
bye,
Said
In a message dated 6/5/2008 12:19:00 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Maybe accelerometers are a must.
They are not that expensive anymore.
ADXL330 (3 axis +-3g analog) seems to be below $6.
**Get trade
I have a pair which came from a 5334B and which I would gladly trade for the
feet :-)
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Scott Mace
Sent: Wednesday, June 04, 2008 5:48 PM
To: Discussion of precise time and frequency
This is what they look like:
http://tonga.globat.com/~ko4bb.com//Test_Equipment/HP_5334B_Rack_Flanges/
The right one has some scuff marks in the paint, but the metal is fine.
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Scott Mace
There are two styles of rack ears for the 5334B. One is shown in Didier's
picture. The other adds ears to the front panel 'handles' and the two are
not interchangeable. Handles are useful for holding probes, etc., but you
could take them off and add the ears shown in Didier's pictures.
Joe
Quoth Ulrich Bangert at 2008-06-05 13:58...
consider the latency times of ANYTHING on a USB provided virtual serial
connection to be in the order of 1 ms. If no serial data is send but
only status signals change their state the latency can even be higher.
Thanks (and to the others who
Didier, this is exactly what I need. I'll contact you off-list.
Scott
Didier Juges wrote:
I have a pair which came from a 5334B and which I would gladly trade for the
feet :-)
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf
At 04:10 PM 6/5/2008, Matthew Smith wrote:
Quoth Ulrich Bangert at 2008-06-05 13:58...
consider the latency times of ANYTHING on a USB provided virtual serial
connection to be in the order of 1 ms. If no serial data is send but
only status signals change their state the latency can even be
On Monday 02 June 2008 02:19:52 pm David C. Partridge wrote:
I'm now thinking ahead to the PCB requirement...
http://focus.ti.com/lit/an/scaa082/scaa082.pdf
http://www.ti.com/litv/pdf/scaa082
Application Notes Abstract
High Speed Layout Guidelines
This application report addresses high-speed
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