US Amateur Radio - Extra [good July 2020 - June 2024]
Sample (from 621 notes)
|question||Why is RF attenuation used when direction-finding?|
|choices||(A) To narrow the receiver bandwidth(B) To compensate for isotropic directivity and the antenna effect of feed lines(C) To increase receiver sensitivity (D) To prevent receiver overload which reduces pattern nulls|
|answer_text||To prevent receiver overload which reduces pattern nulls|
|question||What is a common use for point-contact diodes?|
|choices||(A) As a constant current source(B) As a constant voltage source(C) As an RF detector(D) As a high-voltage rectifier|
|answer_text||As an RF detector|
|question||When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?|
|choices||(A) Its overall length must not exceed 1/4 wavelength(B) It must be mounted more than 1 wavelength above ground(C) It should be configured as a four-sided loop(D) It should be one or more wavelengths long|
|answer_text||It should be one or more wavelengths long|
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