[time-nuts] Austron PRR-10 GPS discliplined Rb...
cfmd at bredband.net
Sat Jan 27 06:35:46 EST 2007
Those interested in micro-steppers might want to look at the Symmetricom
AOG-110 manual. They have a local 5 MHz OCXO locked through a interesting
gear with the incomming 5 MHz and a DDS to result in a 10 kHz comparision
frequency for the phase detector in the loop. The gear acheives a 512000
increase in gain (1024 from gear-works as such and 500 from the ratio of 5 MHz
and 10 kHz). To acheive the 1E-19 stepsize it then takes the DDS a few bits,
but what is 56 bits among friends? Since we don't need to waste too much on
this, there is a 8 bit CPU processing it all in there and it uses a 56 bit
fixed point format.
I'd naturally love a few comments on that one.
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