[time-nuts] cheap 5V OCXO in 14DIP has about 1E-9 drift per day

Greg Broburg semiflex at comcast.net
Sat Apr 9 17:05:41 UTC 2011


The output of the oscillator is square

Greg


On 4/9/2011 10:29 AM, Greg Broburg wrote:
> In looking at the CRD idea, it is not obvious to me how either
> of the 16M0 Hz or the 10M0 Hz signal would contain any
> relevant energy that would give the precision necessary for
> the desired ideal result.
>
> The only harmonic relationship that I can see is to square up
> the clean analog and divide by 13 down to 2M0 Hz, thence use
> the 5th and 8th harmonics at 10M0 and 16M0 but then why
> use the 16M0 at all?
>
> I expect that I am missing something obvious here
> a little nudge may help.
>
> Regards;
>
> Greg
>
>
> On 4/7/2011 1:23 PM, Chris Albertson wrote:
>> On Thu, Apr 7, 2011 at 12:01 PM, Bruce Griffiths
>> <bruce.griffiths at xtra.co.nz>  wrote:
>>> A conjugate regenerative divider with 2 parallel (16MHz&  10MHz) low Q
>>> bandpass filters should suffice.
>> Never having used one of those, I'm thinking I'd need two mixers, a
>> 10MHz bandpass filter and a 16 MHz bandpass filter.  I'm guessing
>> there would need to be some gain in the system too.
>>
>> How stable are these?  Seems to me If the bandpass filters were
>> temperature sensitive the 10MHz output would drift around.    What
>> types of filters and mixers are typically used?
>>
>> I wonder if "conjugate regenerative divider" qualifies as an
>> inexpensive converter
>>
>>
>>
>
>
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