[time-nuts] CSAC purchase

Bob kb8tq kb8tq at n1k.org
Mon Jan 22 16:03:20 EST 2018


I’m guessing there was a question to me that somehow got lost in the world of 
ones and zeros ….

My comment was in terms of temperature stability. The CSAC has a temp stability 
specification of +/-4x10^-10 over -10 to +70C. There are TCXO’s that will get below
5x10^-9 over that range and use far less power. There are OCXO’s that will get
to better temperature stability numbers over that range.  Neither one will do the long
term aging that a Rb will. 


> On Jan 22, 2018, at 3:49 PM, jimlux <jimlux at earthlink.net> wrote:
> On 1/22/18 12:05 PM, Ronald Held wrote:
>> Bob:
>>    OCXO and TCXO are larger then the CSAC?  How much more power would
>> they need to get within a factor of ten to the 1.5s/1000 years?
>>                      Ronald
> OCXO and TCXO are both available smaller than the CSAC (particularly tcxo).  I'm using a vectron EX-421 OCXO and it's about 1cm on a side, the OX205 is about 1" square and maybe 0.60" tall.
> TCXOs are available in "cellphone" form factors (e.g. tiny SMT packages)
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