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Recent content by Didier40

  1. Didier40

    HP87512 /VNA

    Hello Biff44, No in fact there is no ferrite based transformer or something at all. In fact it's made of resistors, but not in a way to build a Wheastone brigde. In fact the Output signal is divided in two signal of different level, one for the Reference port, the other for the A port... If...
  2. Didier40

    HP87512 /VNA

    I have a question for those who have 'worked' closely with the equations involved in the VNA, and particularly for the calibration procedure. At work we have a HP8751A VNA (5Hz-50MHz) working with a Reflexion/Transmission Test Set HP87512. As I'm always loking for 'the way it work', I opened it...
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