> Thanks for the response Björn. Also thanks to Didier Juges for pointing out > that this has been covered on a previous thread. I'll go and find it in the > history.
Somebody setup a good oscillator on a pendulum. They could measure the frequency shift as G changed slightly. There have been several mentions of the change in frequency when you turn an oscillator over. That's a 2G shift. > Unfortunately the device will be used in urban areas so some multipath & > obstruction of skyview is expected. I've just done some testing on my OCXO > and it has a maximum sensitivity of about 5 ppb / *g*, which is notable, > but shouldn't present a problem. I've yet to explore the vibration effects > - thanks for pointing my attention to the motion effects on the OCXO > itself, its an aspect I'd otherwise have overlooked. Somebody provided the URL for a good article on vibration, a PDF from a vendor. The problem they were working on was radar in helicopters. The return signal is smeared by the noise bandwidth in the source signal. That determines the minimal velocity that you can see if you filter out the ground clutter. They were measuring acceleration and correcting via EFC. It was a fun read. Sorry, I don't have any URLs or subjects to search on, but the ideas might help if you are scanning the archives. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
