[time-nuts] FE5680 GPS Disciplined Controller Update
EWKehren at aol.com
EWKehren at aol.com
Wed Jun 25 00:06:55 UTC 2014
Again we are talking past each other I am talking about temperature
compensation with the DDS that ideally should be removed. Those steps upset any
loop.
Bert
In a message dated 6/24/2014 6:38:48 P.M. Eastern Daylight Time,
holrum at hotmail.com writes:
Check out the temperature control code in Lady Heather. It uses a nice
PID controller algorithm (from Warren Sarkison) to PWM modulate a fan to
stabilize the environment around the Tbolt. It can achieve millidegree range
stability... I have seen long term RMS values of the temperature plot less
than a few micro-degrees. The standard Tbolt oscillator has a rather
horrible tempco...
I'll post some recommendations/findings about various environmental
sensors I tried while I was building my weather/envionmental sensor package.
Hint: the MS5611 pressure sensor chip is very nice. Has 24 bit ADCs for
the pressure and temperature readings and produces very stable readings with
a 100 Hz update rate.
----------
However it is disappointing that no one has stepped up to tackle the
temperature problem.
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