Chapman,
Unfortunately, at the current time, the fastest signal that National Instruments offers an analysis product for is 2.7 GHz. This is the NI PXI-5660 RF Vector Signal Analyzer:
Products and Services: NI PXI-5660 RF Vector Signal AnalyzerIf you need to work with a signal at 14 GHz, you would either need to go with a product from another company or take a different approach to analyzing your signal.
I will leave your question open to the forum to see if anyone has experience with hardware capable of measuring at those speeds.
Regards,
Jed R.
Applications Engineer
National Instruments