[time-nuts] Re: HP Z3801A project update

[Hal Murray]

paulswedb at gmail.com said:
> Internally there was a mod that allowed the 3801 to output true rs 232.
> Numbers of jumpers as I recall. Like 8 or 10. 

Jeff Mock wrote up a nice description of how to do it, with good pictures.
  https://support.ntp.org/bin/view/Support/Z3801AReceiverModifications

You can do it easily without installing the moveable jumpers and the pins they 
connect to.  I think it's an a 3x8 array.  The board comes with several 0 ohm 
resistors that you have to remove to use those jumpers.  Move the the 0 phm 
resistors rather than remove them.  You will have to look around a bit to 
figure out where they should go.


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