5600 Downconverter : 10 MHz Reference CLOCK

[RF_Buzzer]

Hi RFSA Guys,

Is it possible to vary the  10 MHz Reference Clock and use  it ... for demodulation of RF Signals

to a new value ... lets say 9.9992 MHz ?

If this is possible, upto what resolution can I vary the clock..

Can I vary it terms of 0.1 Hz or 0.01 Hz.. Is the  10 MHz Reference Clock truly that stable ?

I have a competitor clock which is stable upto  0.01 Hz... but not in PXI Form.

If this is not possible, Can anyone suggest a PXI Version of a Variable Stable External Reference Clock ?

Basically, I am looking at varying the Reference Clock to vary my Symbol rate for a Device Under Test.

Thanks for your help..

Dharmendra

[Chris_D]

Hey Dharmendra,

The PXI-5600 has an onboard 10 MHz OCXO reference clock that cannot be varied. You can find more information about its stability in the 5661 Specifications.

NI PXI-5661 Specifications
http://digital.ni.com/manuals.nsf/websearch/AA95024F707A2BF9862573840056DE7E

Can you not vary your symbol rate by varying your IQ Rate? Or are you trying to achieve this on the fly?

[Chad B]

Dharmendra,

You might also run into problems when the downconverter tries to phase-lock to that reference clock, since it's expecting 10 MHz. Can you tell us a bit more about what you're trying to do? There might be a different way to accomplish it. Thanks!