[time-nuts] 1 PPS 50-ohm driver

wb6bnq wb6bnq at cox.net
Sun Apr 17 14:26:00 UTC 2016


Hi Douglas,

Blowing up the picture shows some lettering in the white bar at the 
bottom of the display (fairly fuzzy).  It looks like it is saying 2 
volts for the signal with the scope set to 0.5 volts per division.

Bill....WB6BNQ


Douglas Bercich wrote:

>I was looking but can't find a V/div anywhere on that. Maybe my old eyes or not enough coffee. 500mV?
>
>  
>
>>On Apr 16, 2016, at 11:58 PM, Stewart Cobb <stewart.cobb at gmail.com> wrote:
>>
>>Here's a scope photo from a PPS driver built exactly to the description in
>>my earlier post.  It's a 74ACT04 in a TSSOP package, with five parallel
>>outputs driving five 220-ohm resistors (0402 SMT) to form a 50-ohm output.
>>
>>The photo shows 2 ns rise time for the leading edge of the pulse. The scope
>>bandwidth is around 1 GHz, so this measurement is pushing its limits.  The
>>pulse looks fairly clean, but with a bit more care in layout and cabling,
>>it might get even better.
>>
>>Cheers!
>>--Stu
>><IMG_20160416_213804.jpg>
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