[time-nuts] Typical EFC frequency response (bandwidth) of a OCXO

Robert Crawford avitek at wwnet.net
Sat Dec 16 11:21:07 EST 2006


Stephan,

I'm still new at this subject and I'm not an expert, but here's what 
I've found.  The SC-10 oscillator from Stanford Research has this 
paragraph in the manual:

"The EFC input exhibits a single-pole RC type response with a -3dB point 
of about 3kHz when driven by a voltage source with an output impedance 
of 1kohm or less."

Also the MTI 250-0799 data sheet indicates a bandwidth of 200 Hz, and 
the 270-0269 has a stated bandwidth of 400 Hz.

I bought a Stanford Research SC-10 directly from the factory about 6 
months ago, but now I know I don't have the equipment to really test the 
stability of this oscillator.

Has anyone had a good look at the SC-10 (tvb?).

Bob Crawford

Stephan Sandenbergh wrote:

>Hi,
>
> 
>
>Many thanks to all the time-nuts that has answered my questions, which I
>posted during the past year so, with such eloquence.
>
> 
>
>My question I have today is regarding the modulation bandwidth of the
>typical OCXO. Previously, I was concerned with locking a 1PPS GPS output to
>a 10MHz OCXO. This 10MHz OCXO is updated on time scales of seconds. Thus,
>the modulation bandwidth of this OCXO isn't much of a concern. However, I
>want to lock that 10MHz GPSDO to a further 100MHz OCXO. From the phase noise
>charts, it is my guess that the loop bandwidth will be in the order of 1kHz.
>Thus, if I can't modulate the 100MHz OCXO at this rate, I will have to think
>of another plan.
>
> 
>
>The modulation bandwidth isn't given in the typical OCXO datasheet. Is there
>a reason for this? Has anyone got experience with this? Or does number vary
>wildly from OCXO to OCXO.
>
> 
>
>Regards,
>
> 
>
>Stephan Sandenbergh.
>
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>
>  
>




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