[time-nuts] FEI 5680a status update

Dan Sawyer dansawyer at earthlink.net
Mon Mar 16 02:54:30 UTC 2009


Thank you for your work and your reply, I was able to disconnect the 
output of the DDS board from the 1 second divider, the DDS board 
produces a clean sine wave.

I thank you for your article, I have a couple of follow up questions:

    1. Which pot is the C-field?
    2. Did you ever set reset on pin 4 of the PIC?
    3. Did you succeed in making the RS-232 interface work?
    4. If so which interface, the S, F, or the program interface?

Thanks Dan kb0qil

Mark Sims wrote:
> I spent quite a bit of time poking and prodding FE5680's.    A while back,  I posted a piece about what I found.   It covers some important details about programming these units.  The part about setting the frequency is at the end of the piece.   Dieder has it available on his site:
> http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:rubidium_oscillators
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