[time-nuts] Cheap 9.8Mhz Sa.22c's

[Bob Camp]

Hi

On Jun 2, 2013, at 4:10 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 06/02/2013 10:05 PM, Bob Camp wrote:
>> Hi
>> 
>> 9.3804 MHz = (2^15*3) * 100 Hz
>> 
>> 10 MHz = 2^5 * 5^5 * 100 Hz
>> 
>> With a normal integer PLL, your highest lock frequency would be 2^5* 100 Hz = 3200 Hz.
> 
> Doable, but you better care about details, and going for a PI-loop is the way to go. For lower ratios between locked frequency and comparator frequency you can cheat more if you do not have any particular requirements.

I'd put it in the "just because you can do it, doesn't mean you should do it" category. The 3,200 Hz sidebands on the 10 MHz could be an issue in some applications. 

Bob

> 
> Cheers,
> Magnus
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