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Is the PNA Better than an 8510?

Question asked by opticyclic on Jan 31, 2007
Latest reply on Jan 31, 2007 by Dr_joel
I know that the PNA has a better GUI, faster sweep time, lower noise floor etc
However, the PNA (as I understand it) is based on couplers and not bridges.

Bridges give better performance than couplers, which can be seen in the 'roll off' at the edges of the bandwidth when you look at the uncorrected responses of broadband test sets (like the 50 GHz 8517B).

My question is, what has been done in the PNA to get around this issue?  

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