Hello Tom, yikes, that does sound like a project indeed. Long Term holdover design in a GPSDO is a real challenge, and even the older specs (CDMA etc) are quite hard to achieve. This is where a Rubidium/Cs really has a huge advantage over any Crystal design. Another problem is the very large spread unit-to-unit for long term holdover. I have seen the same OCXO model come from the same assembly batch, and have a spread of 3x or more on the 24 hour holdover performance, especially when aged less than 1 - 2 months. Of course we are lucky today that a good GPS signal is available most of the time, and a 24 hour hold-over capability is not a critical issue for most hobbyists. bye, Said In a message dated 2/12/2008 16:56:11 Pacific Standard Time, [EMAIL PROTECTED] writes:
Anyway, once I collect enough data, yes, adding a holdover test is the next thing. Several of these GPSDO have such low drift as it is that it could take a week to accurately measure it. **************The year's hottest artists on the red carpet at the Grammy Awards. Go to AOL Music. (http://music.aol.com/grammys?NCID=aolcmp00300000002565) _______________________________________________ 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.