[time-nuts] Measuring Rubidium frequencies

David C. Partridge david.partridge at dsl.pipex.com
Fri Jun 6 12:45:23 EDT 2008

Curious also that 9.99998278 +.00001722 = 10.000000000 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Jim Robbins
Sent: 06 June 2008 14:02
To: time-nuts at febo.com
Subject: [time-nuts] Measuring Rubidium frequencies

Hi all,

I have a problem which I am unable to understand and need some help.  I have
two M100 Rubidiums, a Racal 1992 counter, a factory standard T'Bolt and a
Symmetricom Starloc II.  When I set up either GPSDO as the External Timebase
for the 1992 and measure either Rubidium, I get the same reading of
9.99998278.  When I use the 1992's Internal Timebase, I get 9.99999995.  All
equipment has warmed up.  The antenna is a Symmetricom HP 58532A on the
roof.     On a few occasions I have seen the frequency drift up to
0.00001722.  I would have expected that both Rubies would have read
0.00000000.  Any ideas would be much appreciated.

many thanks,
Jim Robbins
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