[time-nuts] TVB-DIV

[Brooke Clarke]

Hi Christopher:

I made up some prototype boards and have a couple of them out for beta 
testing, see:
http://www.pacificsites.com/~brooke/PRC68COM.shtml#TVB
There's been an issue with the SYNC function that depends on the source 
impedance of the 1 PPS.
It seems that some sources are "weak" and can not drive a 50 Ohm load so 
the input load resistor needs to be selected.

My current project is a PIC based "precision clock" that uses a 
frequency standard as the external oscillator input.  I've been working 
on versions of this for a number of years.  For the current version 
see:   http://www.pacificsites.com/~brooke/PRC68COM.shtml#PC3  and 
scroll down for a photo.  I've got the leap year calculations working 
for Year/4, Year/100 and Year/400 and almost have Zeller's Congruence 
working for the Day of the Week.  These are to replace the Microchip 
TB028 Day of the Week method that has a limited range. 

Have Fun,

Brooke Clarke

-- 
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com



Christopher Hoover wrote:

>Tom Van Baak wrote:
>
>  
>
>>>TVB-DIV is a frequency divider, designed by TVB,
>>>      
>>>
>>Quite a few people have used it over the years.
>>The free source code is at:
>>
>>http://www.leapsecond.com/tools/ppsdiv.zip
>>
>>    
>>
>
>Are people just building these up ugly style, or is there a board design
>floating about?  
>
>-ch
>
>
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