> The Thunderbolt data sheet says that the unit requires 25mA at > 12V. That spec would imply it is for a unit without an OCXO > since the oven heater draws considerable current from the 12V > power supply. But then, the data sheet says it draws 15 watts > cold, 10 watts steady state. That implies the unit has a heater. > And if you multiply the published power supply requirements out > you get 2 watts, not 10-15 watts. It appears that some of the > specs are for an ovenless unit, others are for the ovenized unit.
See actual power requirements for the TAPR Thunderbolt: http://www.leapsecond.com/pages/tbolt/power.htm So, yes, these are OCXO versions. Very nice OCXO. > The data sheet also talks about a telecom version with improved > holdover performance... this has got to be the ovenized unit. I > suspect the Allan variance plot is for the low end unit, but the > shape of the curve is funny. It always slopes downward. Almost > all GPSDO Allan variance plots show a hump in the graph around > 100 seconds. Right. Ignore the ADEV plot on the Trimble data sheet; it's not quite the same unit as the TAPR deal. Please read the FAQ: http://www.leapsecond.com/tbolt-faq.htm /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.
