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PNA-X Noise Figure Scalar Noise Vs Vector Noise

Question asked by YP on Dec 14, 2015
Latest reply on Dec 21, 2015 by Dr_joel
Hi,

   We measured our  LNA with both the scalar and vector.(Attaching both CSA files here). Our LNA is <30dB gain and we use a 346A as noise source and we carried out both measurements inside a sheild box.
I understand the vector noise will be the more accurate one,  however we get 2 very high spikes when we use vector noise figure measurement. Any ideas on what could cause the spike during the vector noise and not on the scalar noise?  

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