The simplest way to make phase noise measurements with a spectrum analyser will be detailed in John Miles website at : http://www.speakeasy.org/~jmiles1/ke5fx/gpib/pn.htm
Look at the section on PN.EXE for info on making the measurements. In
particular, follow the link in the PN.EXE information to the HP Application Note AN 270-2. Phase noise measurements couldn't be easier! I have a TEK 495P analyser and use a GPIB-to-USB dongle (see link for dongle information below).http://www.sparkfun.com/commerce/produc ... cts_id=549
With the dongle providing the interface between my analyser and my desktop or laptop, and using John Miles PN.EXE software, phase noise measurements are amazingly quick and easy. The dongle will work with a wide assortment of analysers- check the list to see if yours is included.