Richard Sharpe wrote: > This might be a useful starting point: > http://www.wireless.org.au/~jhecker/specan/
By the way, I use an USRP2 with an XCVR2450 board for my measurements. There are several classes of spectrum analyzers: - high-end lab grade: wide frequency range (from a few kHz to >> 10 GHz), high frequency resolution (kHz or less), calibrated, very very expensive - medium lab grade: moderate frequency range (up to a few GHz), high resolution, calibrated, expensive - USRP-based: narrow frequency range (XCVR2450 just covers the 2.4 GHz and 5 GHz ISM bands), high resolution, not calibrated, ~2 kUSD for a complete system, can also demodulate the signal (it's basically a vector signal analyzer) - low lab grade: like medium lab grade, but usually with some constraints, price a bit below a USRP solution - WLAN analyzers: narrow frequency range, low resolution, cheap - WLAN finders: narrow frequency range, extremely low resolution, very cheap Different devices are good for different purposes. E.g., a WLAN analyzer can be used by a network admin to find holes in the coverage, detect failing access points, and identify the place where some prankster has wrapped tin foil around the antenna. The medium lab stuff can be used to debug a device or a design. E.g., find spectrum leakage near and far (but not too far) from the desired frequency, see how component changes affect the spectrum, etc. The high-end lab stuff can also be used for certification. For certification, equipment needs to be calibrated and it must be able to detect even extreme outliers (e.g., to properly certify correct operation of a 2.4 GHz device, one has to be sure that there's no excessive spectrum leakage up to 25 GHz.) The USRP is a compromise between getting something that can see many (but not all) things, that can generate signals, that's flexible and completely open, and not spending too much money. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
