Questenaتمرینی که نشان می‌دهد بعد چه چیزی را مرور کنید
سؤال 577

When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?

  1. Its overall length must not exceed 1/4 wavelength
  2. It must be mounted more than 1 wavelength above ground
  3. It should be configured as a four-sided loop
  4. It should be at least one wavelength longپاسخ درست

توضیح

A Beverage is a traveling-wave antenna: the signal induced in a long wire close to the ground builds up progressively as the incoming wave from the favored direction travels along it. That build-up needs at least a wavelength of wire, and preferably several, with the wire mounted low rather than high.

ادامهٔ این آزمون

شروع تمرین
سؤال 577: When constructing a Beverage antenna, which of the… · FCC Amateur Extra Class (Element 4) · Questena