Hi An OCXO crystal needs to be "good" only at one temperature. The crystal in an MCXO needs to do well over a wide range of temperatures. That complicates things quite a bit.
Bob On Aug 30, 2012, at 12:22 AM, Hal Murray <hmur...@megapathdsl.net> wrote: > > rich...@karlquist.com said: >> No it doesn't use a cheap crystal. It uses a *special* SC cut crystal. This >> crystal could very easily cost more than an OCXO crystal. > > What's special about it? > > I assume the cost-more aspect would be to allow an overall goodness factor > competitive with an OCXO in the low power corner of the marketplace. It > might be cheaper overall to use a good crystal and a uP to correct for > temperature than provide the power to run the oven. > > -------- > > The other area where a uP is useful is in an environment with high vibration. > It can correct for acceleration as well as temperature. There were several > good URLs mention on this list in the past year or two. The context was > radar on helicopters. Helicopters are full of vibrations/accelerations. The > numbers work out such that the frequency broadening due to vibration is > interesting if your radar is looking for slowly moving things like people. > > ---------- > > Crazy question dept: > > What do low cost rubidium oscillators do when vibrating? Is it dominated by > the cleanup crystal? > > > > -- > These are my opinions. 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. _______________________________________________ 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.
