Synchronizing two PXI-5650's for OOK modulation

[Jendzurski]

Hello,

I am trying to synchronize two PXI-5650's. Both are generating OOK modulated waveforms. Does anyone know how to synchronize the two so that pulses can be aligned/delayed relative to one another.  I am not concerned with synchronizing the RF content...just the digital modulation.

Thanks!

-John

[Brian-G]

Hi John,

How are you supplying the digital signal to the PXI-5650s?  Are you using the psuedorandom bit sequence or user defined waveform type?

[Jendzurski]

Hi Brian, I am using the User Defined option. Basically I am generating an RF CW pulse from each 5650.  Each 5650 uses the same User Defined wavform as an input, and I would like to be able to control the relative delay of the pulses from each board.

-John

[mbb25]

I'm pretty sure what you want is not supported.

From an API point of view, I think what you want is to configure a start trigger on both devices (say, PXI_Trig0), and send in a trigger to get both user-defined waveforms to start running at the same time.  The 5652 does not support a start trigger, however.

Another possibility API-wise is to set up a configuration list, and have list step 0 just generate CW (maybe -90 dBm), and configure step 1 to generate your user-defined waveform.  You could then use a configuration list step trigger to get the two devices to transition to step 1 at the same time.  However, the 5652 doesn't support modulation in list mode.

I believe you are out of luck.  Sorry.