Hello Sharmi,
It's a little unclear from your post, but it sounds like you're using one 5652 as a CW source, and are using a 5663 (with a separate 5652) to capture received signals.
1. Is it possible to use the same 5652 as an LO and CW source?
-no, these need to be controlled separately for this kind of application (i.e. separate amplitude & frequency control).
2. Is it possible to synchronize a 5652 (acting as a CW source) with a 5663?
Yes, it's possible to TClk these devices together, so that generation and acquisition start simultaneously. I believe my coworker has already forwarded you information on this subject in a separate service request.
In order for us to help you better, it may be valuable for you to provide a much more detailed description of your application. This may save on much of the back and forth communication, and would allow us to give you more specific assistance.
Cheers,
James M. | Applications Engineer | National Instruments