[time-nuts] The 5MHz Sweet Spot
EWKehren at aol.com
EWKehren at aol.com
Sun Nov 3 17:51:30 EST 2013
We are looking at room temperature 5 and 10 MHz XO's for cleaning up Rb and
DDS. Filter time 1 to 20 seconds and thermal mass to keep temperature
influence low. Hard to find XO's, so what we are testing is older TCXO's where
we remove the TC and use the tuning circuit for loop control. Any
suggestions? Maybe slightly off subject but the experts are here.
Thanks Bert Kehren
In a message dated 11/3/2013 4:41:43 P.M. Eastern Standard Time,
saidjack at aol.com writes:
The partial answer is: yes as they typically use 10MHz crystals too. But
the loop BW is so wide (10Hz or more) that the crystal jumps get compensated
very quickly.
We have not seen any real frequency jumps in 100's of CSACs we tested that
use vapor cells just like RB's do, so from my experience I have never seen
a discrete frequency jump in an Atomic oscillator..
Notice that CSACs do jump significantly in frequency right after power on
when they achieve atomic lock, typically about 60s after power on.
Vapor cell atomic clocks typically have other issues such as excessive
retrace, loss of vacuum and a subsequent slow drift in frequency, and almost
instantaneous loss of atomic lock causing frequency jumps when operated
above max temperature..
Sent From iPhone
On Nov 3, 2013, at 13:28, Hal Murray <hmurray at megapathdsl.net> wrote:
>
> Do low cost recycled Rubidiums have any quirks equivalent to frequency
jumps
> in crystals?
>
>
>
> --
> These are my opinions. I hate spam.
>
>
>
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