[time-nuts] Enhancing the TIC232 code for better data

Brooke Clarke brooke at pacific.net
Sun Aug 13 13:16:54 EDT 2006


Hi Bill & Didier:

I think that Richard is using the tvb divider on his 10 MHz reference to 
get to 1 PPS and that has a square wave output.

Have Fun,

Brooke Clarke

-- 
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Bill Janssen wrote:

>Didier Juges wrote:
>
>  
>
>>Second thoughts about inverting the UTC 1PPS. I have read in a previous 
>>post that for most GPS receivers, only the leading edge of the 1PPS 
>>pulse is tightly controlled (and intended to be synchronous with the 
>>satellite signal), the falling edge is not. If this is true, we want to 
>>make sure we keep that edge the way it is and then invert the 1PPS from 
>>the DUT, if this is possible.
>>
>>Also, at least with my Jupiter receiver, the 1PPS is a fairly short 
>>pulse, not nearly 50% duty cycle, so inverting it might not give much 
>>improvement.
>>
>>Any thoughts?
>>
>>Didier
>>
>>    
>>
>Would it be feasible to clock a flip-flop with the pulse ? that would 
>give a 50% duty
>cycle but with one  pulse per two seconds. I hate to slow the signal but 
>it might be feasible.
>
>Bill K7NOM
>
>
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