>>>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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