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Recent content by ronzino

  1. R

    4 kilometers transmission line characterization

    I have further investigated this point. I have removed the baluns in orther to check if the problem is generated by them. So, I have performed full 2 port calibration using two BNCs with crocodile connectors and 50ohm reference resistance. Then I have looked at the first frequency point where...
  2. R

    4 kilometers transmission line characterization

    I have tried to perform the measure without using baluns on bot ports, and the result for L and C are the same. What do you mean for "impedance matching network is not calibrated " ? I have performed a 2-port cal (reflection and transmission) (open short load and thru) Are you suggesting me to...
  3. R

    4 kilometers transmission line characterization

    i have this option;-) - - - Updated - - - mmmmm are you sure that using S parameters as i have used, implies a lossless transmission line ? it is the same way as matlab use it in s2rlgc function - - - Updated - - - yes i know, consider the measure upper limit at 1MHz. 10MHz measure is just...
  4. R

    4 kilometers transmission line characterization

    I think i have enough point at S21 phase (i have attached a new picture) the expected values are L= 0.58 mH/Km C= 63 nF/Km
  5. R

    4 kilometers transmission line characterization

    i am expecting about L' = 0.58 mH/Km C' = 63 nF/km yes I think that i have enough point at S21 phase. I have just attached a picture
  6. R

    4 kilometers transmission line characterization

    I am measuring using 2-port network with a full two port calibration (short, open, load on both ports and thru). A balun 50ohm -> 100ohm is connected to each port and the to the cable. The calibration is performed with the baluns attached to the instrument I have set systemZ0 to 100ohm, but i...
  7. R

    4 kilometers transmission line characterization

    Hello, I have a problem with inductance and capacitance measure of a transmission line 4 Kilometers long. The attenuation and characteristic impedance are good, but L and C suddenly fall down and start oscillate. In order to calculate RLGC model I have exported s-parameters touchstone file from...

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