Jim, I believe that a preselector is usually used to amplify the signal under consideration while rejecting nearby signals. It should not be necessary if the equipment under test is located in a shielded room, semi-anechoic, since the measuring instrumentation will be located close to the room and since external signals should be non existant.
My opinion of course. Gabriel Roy hughes Network Systems MD ------------------------------------- snip ---------------------------------- Does anyone know if a spectrum analyzer preselector is required for emissions testing in a semi-anechoic FCC certified chamber for FCC Part 15, CISPR 22, and Bellcore GR-1089-CORE. Thanks, Jim Wiese ADTRAN, Inc. 901 Explorer Blvd. Huntsville, AL 35806-2807 205-971-8431 [email protected]
