[time-nuts] Measuring Rubidium frequencies

[David C. Partridge]

Would I be correct to assume that the 1992 (I have one of these bbies as
well) reads 9.9999999 * 10**6 when measuring one GSPDO, and using the other
as an external reference?  Or does it also read 9.99998278?    If so I'd be
worried about the external ref circuit in my 1992.

Also, would I also be correct to assume that you've cal'd the crystal in the
1992 using the GPSDOs as a ref?

As to why both rubidiums read low by exactly the same amount???  That has me
puzzled ...

-----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
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.