Re: [time-nuts] low-g OCXO GPSDO

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

Re: [time-nuts] low-g OCXO GPSDO

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 won

Re: [time-nuts] low-g OCXO GPSDO

> 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 i

Re: [time-nuts] low-g OCXO GPSDO

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, > Sa

Re: [time-nuts] low-g OCXO GPSDO

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. Mayb

Re: [time-nuts] low-g OCXO GPSDO

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. > >

Re: [time-nuts] low-g OCXO GPSDO

[time-nuts] low-g OCXO GPSDO 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

Re: [time-nuts] low-g OCXO GPSDO

and frequency measurement Subject: Re: [time-nuts] low-g OCXO GPSDO 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

Re: [time-nuts] low-g OCXO GPSDO

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 co

Re: [time-nuts] low-g OCXO GPSDO

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

Re: [time-nuts] low-g OCXO GPSDO

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

Re: [time-nuts] low-g OCXO GPSDO

s Sent: 05 June 2008 18:26 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] low-g OCXO GPSDO > A "normal" OCXO would drift significantly when being turned around in > any direction. I've actually been wondering about what physical mechanism that

Re: [time-nuts] low-g OCXO GPSDO

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 three-

Re: [time-nuts] low-g OCXO GPSDO

> 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 _

[time-nuts] low-g OCXO GPSDO

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 e