[time-nuts] FE-.5680A trimming resolution

Bob Camp lists at rtty.us
Sun Jan 29 10:03:17 EST 2012


Yes, I think the dither would just be a minor routine running on what ever you use to discipline the rubidium. Other than a disciplined environment I don't see a lot of  need for sub 7x10^-13 steps.


On Jan 29, 2012, at 9:12 AM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 01/29/2012 02:45 PM, Bob Camp wrote:
>> Hi
>> Very interesting.
>> It sounds like dithering would be needed to get down to parts in 10^-14. If we do that from an external device (PC / PIC / FPGA / whatever) it would be useful to know the delay between the serial command and the DDS update. The more variable the delay, the less accurate the dither.
> Considering that you only need about 3 bits or so, and considering that the internal step mechanism run with so low rate, achieving this should not be all that hard really. It's not like there is a flashy GUI for the PIC to keep up with. A little 8 pin PIC should pull it off with not too high effort.
> Cheers
> Magns
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