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question of SA measurement in digital TV signals

Question asked by xjseu on Aug 21, 2007
Latest reply on Oct 11, 2007 by dichheda
I used E4402B to measure the cable TV signals, but the spetrum displayed is very bad,the SNR is very low(<5dB).But when the signal is amplified by a LNA(BFG540),the signal measured and the SNR displayed is very good.
I set the input mixer level , reference level , pre-amp, VBW,RBW in 4402B,but it is useless!
can you tell why?