[time-nuts] NTP/1-PPS/RS232 question

Hal Murray hmurray at megapathdsl.net
Sun Sep 8 17:12:40 EDT 2013


lists at rtty.us said:
> Actually if it's 100 ms late, you need 900 ms of inverter gates. At 4.5 ns
> per gate that would be 100,000 gates.

If I did my math right, you are off by a factor of 2000.  900 ms is 900,000 
uSec.  If the delay per gate was 4.5 uSec that would take 200,000 gates.  But 
the delay was nSec rather than uSec, so add 3 more zeros.

My HC04 data sheet says 9 ns typical at 4.5 V, so I'll give you back the 
factor or 2.  That leaves 100,000,000 gates.  When I run out of things to do, 
I'll try to convert that to cubic meters, or houses/offices.


> Much easier to simply mod the code in the driver. 
Especially since the mod has already been done, at least for ntpd.  All you 
have to do is add a line to the config file.


-- 
These are my opinions.  I hate spam.





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