>>>Is there any special equipment needed? I have two of 3117 horn antenna and an Agilent N5182A in my workplace.<<< I have not done this procedure yet, but have read up on it some. I don't have a copy of the standard handy right now, but I believe one of the antennas (the one moved around the turntable) must be isotropic. A horn is not suitable. The reason, as I understand it, is that a horn will give results that do not test the back-wall absorber since it has a high front-back ratio. Someone correct me if I am wrong. (ducking for cover.....) :-) I do know that I performed a 61000-4-3 16pt calibration once with horns for transmit and receive. The uniformity was great with two horns, but when I substituted an isotropic field probe for the receive antenna (the way the standard specifies) the uniformity was much worse. The only thing I could think of was that the narrow beamwidth of the horn was effectively cancelling out reflections. Bob R.
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