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السؤال 269

Why is it important to keep lead lengths short for components used in circuits for VHF and above?

  1. To increase the thermal time constant
  2. To minimize inductive reactanceالإجابة الصحيحة
  3. To maintain component lifetime
  4. All these choices are correct

الشرح

Every length of wire has inductance of roughly a nanohenry per millimetre, and the reactance of that inductance grows with frequency. At VHF and above even short leads present enough inductive reactance to detune circuits and degrade bypassing, so leads are kept as short as possible.

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السؤال 269: Why is it important to keep lead lengths short for… · FCC Amateur Extra Class (Element 4) · Questena