Using Lady Heather's temperature controller (fan+cardboard box+solid state
relay+baffling and thermal mass to taste) I get around +/- 3 millidegree
temperature control when the AC/furnace is not running and +/- 20 millidegrees
with them cycling. Long term temperature average is down in the tens of
microdegrees. Under ideal conditions, I have seen over an hour where the
temperature sensor did not move a single microdegree! The active temperature
control has a most definite positive effect on the device performance.
I place the power supply in the thermal enclosure to minimize its output
temperature coefficient. Yes, the thermal sensor is away from the oscillator
module (and power supply) but in the semi-closed environment of the box, the
thermal stability on one area is pretty much the same everywhere. I have
chosen my box so that if the fan stops (for whatever reason) the temperature in
the box still does not exceed 50C.
For the ultra best uber performance you need to maximize the quality of all the
input and environmental variables (temperature, power, antenna, surveyed
location, disciplining parameters, etc) Choose your antenna mask angle and
signal level threshold to minimize satellite constellation switching. With a
little nutty attention to the details you can get parts per trillion
performance out of the little beastie.
_______________________________________________
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.
