[time-nuts] Brooks Shera's GPS locking circuit II
kirbybq at bellsouth.net
Wed Dec 20 16:57:34 EST 2006
Let me add a note. The Shera controller also has a hold mode. This
mode will freeze the DAC output at its current voltage. So when its
engaged with a rubidium oscillator, your rubidium becomes a normal
unit, except it has been "super tuned" to UTC ! Short term specs return
to normal, etc.
Somebody asked a question about the GPS sawtooth bridge and the
controller. If the controller detects a problem during the measurement
period ( and remember it looks at the last value, the present value and
the future value), it will throw out that solution, as it is not valid.
It holds the last used value in the DAC.
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