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[time-freq] FatPPS Users -- Important Information

John Ackermann N8UR jra at febo.com
Thu Apr 26 23:32:03 UTC 2007

Hi --

Mark Thomas discovered that there is a manufacturing error on the FatPPS
board that results in the optional DC INPUT pad being shorted to the RXD
data line (pin 2 of the DB-9).

This is NOT an issue unless you are both (a) using external DC input
power instead of power derived from the serial port, and (b) are passing
RX data from the input DB-9 to the output.  Most folks don't use the
external power input, so they won't notice any problems (and that's why
this problem wasn't detected earlier).

Unfortunately this error is etched onto the circuit board, so the only
way to really fix it is to carefully remove part of the plated-through
DC INPUT pad so that it no longer overlaps the RXD signal line.

We're working on a way to resolve this issue for future assembly runs of
the FatPPS.  Until then, sorry for the inconvenience.


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