Hi there, there are special low-g OCXO's out there. We offer one that has better than 3E-010 per g per axis, which is about 10x better than your "standard" OCXO. This is also important for stationary applications where the unit is not tilted, for vibration-induced phase-noise is also that much smaller with a low-g OCXO versus a standard OCXO. bye, Said In a message dated 8/13/2009 11:02:51 Pacific Daylight Time, [email protected] writes:
A while back there was some discussion about crystal oscillator's changing frequency due to the effects of gravity. Since I got my Z3801 up and running full time, I have been trying to characterize some OCXOs I had picked off eBay but had no specifications for. I was trying to fine tune one to the '3801 and noticed that when I picked it up and tilted it to get to the adjustment , the frequency changed. I started rotating it 90 degrees at at time and noticed that the frequency changed up or down depending on which it was oriented. The change was immediate and quite noticeable. It is nice to have something as stable as the Z3801 but now I realize all those OCXOs I thought were so great, aren't. I do see why the rubidium sources are well liked. They lock in a couple of minutes and that's pretty much it. The ones I bought off eBay were both off by about 1E-9. It occurred to me that they probably in equipment where they were locked to GPS and with nothing connected to the frequency control input, they would naturally be a little off. _______________________________________________ _______________________________________________ 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.
