[time-nuts] Adjusting HP 5065A frequency

Bob Camp lists at rtty.us
Mon Oct 22 20:29:09 EDT 2012


Hi

Yes, a DDS at high freq./ narrow band crystal filter / divide to low audio / image reject mix with input back to rf / lock to VCXO approach would get around much (but not quite all) of the truncation stuff. It's complex enough that I suspect that ADC approach would give it a "run for the money" ( equal to, or better than bang for the buck).

Bob 

On Oct 22, 2012, at 7:18 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 10/23/2012 12:41 AM, Bob Camp wrote:
>> Hi
>> 
>> Modern parts are pretty cool. I have measured them them for this application. The truncation still is a big issue.
> 
> If you generate a lower frequency and gear it up in frequency, you would get better result. It's more or less what the phase micro-steppers do anyway.
> 
> IEM Kvarz also makes micro-stepper BTW.
> 
> Cheers,
> Magnus
> 
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