[time-nuts] FE5680 DDS plot

Bob Camp lists at rtty.us
Mon Feb 6 01:56:42 UTC 2012


Hi

I suspect it's a linear compensation of a temperature effect that's actually higher order. Depending on exactly where you are it could be a good thing or a very bad thing. I have seen examples of both …

Bob

On Feb 5, 2012, at 9:02 AM, Magnus Danielson wrote:

> On 02/02/2012 06:15 AM, Scott Newell wrote:
>> Javier Herrero's exciting DDS discovery led to this plot of the unit
>> tweaking the frequency (cmd 0x22):
>> 
>> http://n5tnl.com/time/fe-5680a/graphs/dds_autotuning.png
>> 
>> It appears to make an adjustment even before lock!
>> 
> 
> It is interesting how the DDS frequency compensates the temperature. Should mostly improve performance on start-up or unstable thermal situations, but be of fairly low improvement on static conditions.
> 
> Cheers,
> Magnus
> 
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