Hi Should have been two out of three things ...
Bob On Oct 13, 2010, at 6:58 AM, Bob Camp wrote: > Hi > > Controller cycling is often a result of one of two things: > > 1) Resistance in the power lead > 2) Extra insulation / dead air > 3) Internal controller issues > > There are a few other possibilities, but they are remote enough that you are > unlikely to ever come across them. There's no advantage to building a > controller that's cycling. It was more likely a bug than a feature. > > Bob > > > On Oct 13, 2010, at 4:00 AM, Magnus Danielson wrote: > >> On 10/13/2010 05:32 AM, Jim Lux wrote: >>> >>> >>> On Oct 12, 2010, at 6:09 PM, Magnus Danielson<[email protected]> >>> wrote: >>> >>>> Hi Bob and Dave, >>>> >>>> On 10/13/2010 02:57 AM, Bob Camp wrote: >>>>> Hi >>>>> >>>>> Yes it is a reasonable expectation as long as you don't have a lot of >>>>> drafts. A good TCXO can get down to sub 0.1 ppb over that period. >>>> >>>> This is why I like ADEV plots in datasheets. I rarely get to see them. >>>> TDEV plots is a nice complement naturally. >>>> >>>> Cheers, >>>> Magnus >>>> >>>>> Bob >>>>> >>> >>> And I wish there were adev plots for cheap tcxo's on the mgr data sheets >> >> Me too. I have to make the measurement myself. In one case I found that the >> oven control in one OCXO was unstable and had a resonance at about 7 second >> period. It was possible to measure it on the current supply too. The >> oven-control was having a relatively high-Q resonance and self-oscillation >> around the stability point. It increased the ADEV at that point to almost >> about 10 times more than expected. I learned that it was a good thing I >> measured it and yes, that spec didn't exist in the datasheet. It is unclear >> if they knew it or not. Even my half-crap setup proved valueable as I got >> aware of an issue on sample level rather than out in production phase. >> >> Cheers, >> Magnus >> >> _______________________________________________ >> 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. > > > _______________________________________________ > 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. _______________________________________________ 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.
