[time-nuts] Efratom FRS 10mhz rubidium frequency oscillator+ board
GandalfG8 at aol.com
GandalfG8 at aol.com
Tue Jun 16 11:49:58 UTC 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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