E9E01

What system matches a high-impedance transmission line to a lower impedance antenna by connecting the line to the driven element in two places spaced a fraction of a wavelength each side of element center?

  1. The delta matching system

E9E02

What is the name of an antenna matching system that matches an unbalanced feed line to an antenna by feeding the driven element both at the center of the element and at a fraction of a wavelength to one side of center?

  1. The gamma match

E9E03

What is the name of the matching system that uses a short perpendicular section of transmission line connected to the feed line near the antenna?

  1. The stub match

E9E04

What is the purpose of the series capacitor in a gamma-type antenna matching network?

  1. To compensate for the inductive reactance of the matching network

E9E05

How must the driven element in a 3-element Yagi be tuned to use a hairpin matching system?

  1. The driven element reactance must be capacitive

E9E06

What is the equivalent lumped-constant network for a hairpin matching system on a 3-element Yagi?

  1. L network

E9E07

What parameter best describes the interactions at the load end of a mismatched transmission line?

  1. Reflection coefficient

E9E08

Which of the following measurements describes a mismatched transmission line?

  1. An SWR greater than 1:1

E9E09

Which of these matching systems is an effective method of connecting a 50-ohm coaxial cable feed-line to a grounded tower so it can be used as a vertical antenna?

  1. Gamma match

E9E10

Which of these choices is an effective way to match an antenna with a 100-ohm terminal impedance to a 50-ohm coaxial cable feed-line?

  1. Insert a 1/4-wavelength piece of 75-ohm coaxial cable transmission line in series between the antenna terminals and the 50-ohm feed cable

E9E11

What is an effective way of matching a feed-line to a VHF or UHF antenna when the impedances of both the antenna and feed-line are unknown?

  1. Use the "universal stub" matching technique

E9E12

What is the primary purpose of a "phasing line" when used with an antenna having multiple driven elements?

  1. It ensures that each driven element operates in concert with the others to create the desired antenna pattern

E9E13

What is the purpose of a "Wilkinson divider"?

  1. It divides power equally among multiple loads while preventing changes in one load from disturbing power flow to the others

 

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