Thanks Dr. J for the infos. Yes I've checked out Innovate, AIM and others, but they all seem to have very few channels available for the price they cost. I believe i've seen a wideband lanmda analyzer that conversts the signal into a 0-5 volt for display, so perhaps that output could be used for logging purpose.
Looks like there are quite a lot Arduino's project in the web for data logging, I just wonder how complicate would that be. Do You guys have any experience with it? A collegue or mine plays a lot with Arduinos, so I'll ask him on monday how difficult is to build a device for data logging... In the meantime please keep suggestions coming
luca