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

[Bruce Griffiths]

Bruce Griffiths wrote:
> Oz-in-DFW wrote:
>>
>> On 4/9/2011 11:29 AM, Greg Broburg wrote:
>>> <deletia>
>>>
>>> I expect that I am missing something obvious here
>>> a little nudge may help.
>>>
>>> Regards;
>>>
>>> Greg
>>>
>> What you are missing is that the concept only applies to small integer
>> (2 or 3) division ratios and won't work as speculated here.  It's sort
>> of (long stretch here) like injection locking in reverse.  If you want
>> I'll try and post some links to papers later.
>>
> Nonsense, its already been done for much larger ratios and they need 
> not be integers.
> Try simulating it.
>
> Bruce
>
One counter example to the simplistic statement about the operating mode 
of a regenerative divider being restricted to division by small integers 
only, is that such analysis appears to preclude the possibility of using 
a regenerative divider to produce a frequency comb. Unfortunately a 
regenerative divider has already been used to produce a low noise 
frequency comb where the comb frequency spacing is f/n(where f is the 
input frequency and n is an integer). Its possible to extract a 
frequency that is a rational fraction (m/n where m and n are integers) 
of the input frequency from such a  regenerative frequency comb. Thus 
there is at least one method of using a regenerative divider to produce 
a 10MHz signal from a 26MHz signal.

Bruce