[time-nuts] Digital Mixing with a BeagleBone Black and D Flip Flop

Magnus Danielson magnus at rubidium.dyndns.org
Tue Oct 14 19:52:47 EDT 2014


Tom,

I think I wrote some VHDL code for a project like this... if I should 
dig it out again?

Cheers,
Magnus

On 10/14/2014 11:19 PM, Tom Van Baak wrote:
> Hi Simon,
>
> Some additional info. I first heard about the D-FF method of frequency comparison in the late 90's (from Rick Hambly, I think) on the old gps mailing list. It sounded really interesting. Since then, the subject has turned up every few years on this list. But each time, the topic seems to go away quietly with little or no data, plots or explanation. In addition, none of the commercial products I've taken apart appear to use this approach. Hmm. So that begs the question -- what's really going on, and why.
>
> I'm enjoying this thread because you've shown both technical competence and optimistic persistence. Perhaps once and for all, with your efforts, we can settle this matter. You will either find a working combination with excellent performance, or you will uncover enough uncontrolled variables that you never want to try it again. Either way, we all learn a lot. Keep the photos, data, and plots coming.
>
> Thanks,
> /tvb
>
> ----- Original Message -----
> From: "Simon Marsh" <subscriptions at burble.com>
> To: <time-nuts at febo.com>
> Sent: Tuesday, October 14, 2014 9:34 AM
> Subject: Re: [time-nuts] Digital Mixing with a BeagleBone Black and D Flip Flop
>
>
>> Yes, I do understand I'm asking for trouble, though I kinda expected to
>> see more noise rather than less.
>> I guess its time to break out the soldering iron.
>>
>> Cheers
>>
>>
>> Simon
>
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