Hi Tom, Can you explain what is meant by "damping ?"
How is the "damping" related to the time constant ? I gather from your referenced web page that it seems that a higher number was better. Is this a correct assumption ? thanks, Bill.....WB6BNQ Tom Van Baak wrote: > > Does the longer time constant actually make a "better" frequency standard, > > or > > does it just push the noise from one frequency region to another? Has > > anybody with gear good enough to measure close in noise looked at the > > spectrum for different time constants? > > Hal, > > Last I checked - phase noise, as in L(f), is the same for all > time constants. > > Frequency stability, as in sigma(tau), ADEV, etc. typically > improves as the TC increases, out to 1000 s. The default of > 100 s works pretty well for normal environments. But if your > sat visibility and voltages and temperature and air currents and > local seismic (vibration, shock, kids playing, doors closing, etc.) > environment is unusually stable then you could bump the TC > beyond 100, maybe even near 1000. I run my best TBolts > closer to 300. > > For some time constant plots, see: > > http://www.leapsecond.com/pages/tbolt-tc/ > > /tvb > > _______________________________________________ > 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.
