[time-nuts] Efratom FRS 10mhz rubidium frequency oscillator+ board

GandalfG8 at aol.com GandalfG8 at aol.com
Tue Jun 16 07:49:58 EDT 2009


 
Hi Rex
 
Looking again at Didier's email, and the copy there of the original  
question, I can understand now why I never saw that original request and why I  
really was wasting bandwidth by answering it here, it looks like  Didier 
posted his reply here to a question from elsewhere, thanks  Didier:-)
 
You have at least confirmed that what I assumed seems correct and  thanks 
for the link to your pdf file, that's a bit more useful  information.
 
regards
 
Nigel
GM8PZR
 
 
In a message dated 16/06/2009 11:25:19 GMT Daylight Time, rexa at sonic.net  
writes:

I posted  this in reply to the original question in the Microwave list...

What  you are describing is not an FRS-C but a box that contains an 
FRS-C. I  think it was some kind of Telco package. The box produces 
versions of the  10 MHz from the FRS-C on two of the TNC's and a 15 MHz 
sine generated from  the 10 MHz on the third.

I bought one of these in 2004 and did some  digging to try to figure out 
what is inside. The results of this are in a  document I created,  here:
ftp://ftp.sonic.net/pub/users/rexa/FRSrubidium/rubid_notes.pdf

There's  a version of the FRS-C manual in that same FTP directory.

My  recollection is that the FRS-C is not very clean in phase noise. The  
document should have all you need to get it working. If you learn any  
more about what the mystery pins (11 - 25 on the DB-25) might have been  
for, I'd be interested to hear about it.

-Rex,  kk6mk


 



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