[time-nuts] BC637PCI and OCXO

GandalfG8 at aol.com GandalfG8 at aol.com
Fri Feb 7 03:38:45 EST 2014

I played with this around five or six years ago but unfortunately  my notes 
from that time are likely to be buried somewhere still  waiting to be 
scanned or indexed.
All the necessary information though is in the user and SDK manuals,  
connections for the 10MHz external input and EFC output are on the 15 way I/O  
connector and there's even demo software which I'm pretty sure was all I  used 
to make the necessary adjustments.
One manual, pre Symmetricom, even has what looks to be a full set of  
I've just run the software again to check but it won't do much if  it can't 
find the card so would need to fire up another PC with a spare  slot to 
check further.
I wasn't really happy at the time with my attempts to  condition an 
external Vectron OCXO, it was certainly better than using the  internal oscillator 
but there were some odd jumps and drifts using either which  suggested these 
might be artifacts of the board itself rather than the  Vectron OCXO.
I've since acquired another BC637PCI, and want to try both again with  
other oscillators, but that's quite some way down a very  long to do list, now 
reminded though I might take a quick  look later:-)
In the meantime, I have got copies of manuals and software  etc and will 
get those zipped up today and make them available  for download.

In a message dated 07/02/2014 03:36:46 GMT Standard Time, time at patoka.org  


Does anybody seen any links to the information  how to implement external 
OCXO to Symmetricom PCI TFP BC635/BC637  ?


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