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Using VNA 85047A for PA measurement

Question asked by Moshe on Dec 12, 2006
Latest reply on Feb 2, 2007 by david_ballo
I want to use the 85047A with option 11 ( including 8753ES) for measuring PA input reflection and transmission. I read in one of the AN (1287-6) that with the help of two external couplers and a booster i can do that. I understand the configuration  (4) that the paper is offering, but I don't understand why can't I use the internal couplers, ie connecting the booster between the  RF output of the 85047A and RF input of the 8753ES ?
Is it because  the inner couplers are limited regarding the RF power applied to them ?