); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] In a message dated 7/16/2007 12:10:54 Pacific Daylight Time, [EMAIL PROTECTED] writes:
>For example tilting the Cs unit by 90 degrees will typically give an error >of about 1E-09 or so. >It would take some time for the control loops to compensate for this error. Hi guys, I did tilt my 4050 when I first installed the unit, that number is from my memory. Notice that Magnus is right of course, the Cs will compensate the tilt, given enough time to do so. I did not mean that the 1E-09 error will stay permanent of course, as I said in the follow-on sentence. Also the 4050 is not very well temperature compensated compared to modern units, I was not impressed when I saw the FTS tempco specifications. A good GPSDO can outperform the 4050. I have a military OCXO sample (new product) that is supposed to be "g-insensitive" and even that one has about E-09 frequency shift per 90 degrees tilt. One of the only ways to get around that is to use three crystals in series, with the three crystals oriented in the the XYZ axis, so their errors compensate out. Vibration is also a big enemy of crystal oscillators of course. bye, Said ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
