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

[Bruce Griffiths]

There are also loop gain and phase shift requirements to be met for 
stable operation (ie with no asynchronous modes).

Bruce

Greg Broburg wrote:
> 10.000005 = 26 - 15.999995
>
> 15.999995 = 26 - 10.000005
>
> This pair of equations is insufficient to define
> that the ratio between these two frequencies
> is exactly 1.6 : 1 or 1 : 1.6
>
> There must be an additional concept here.
>
> Greg
>
>
> On 4/9/2011 6:59 PM, Hal Murray wrote:
>> bruce.griffiths at xtra.co.nz said:
>>> The 16MHz is necessary for the loop to function: The mixer mixes 
>>> down the
>>> 26MHz to a pair of conjugate frequencies, 10MHz  and 16MHz. Thermal and
>>> device noise is sufficient to start the process.
>>> 10MHz = 26MHz - 16MHz
>>> 16MHz = 26MHz - 10MHz
>> What makes it stable at 10 and 16 MHz rather than 10.000001 and 
>> 15.999999?
>>
>> I'm assuming we are starting with a good 26 MHz crystal and that it 
>> would be hard to get filters that good.
>>
>>
>
>
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