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G9A02 - What is the relationship between high standing wave ratio (SWR) and transmission line loss?
|
|
0
|
8
|
December 15, 2025
|
|
G9A01 - Which of the following factors determine the characteristic impedance of a parallel conductor feed line?
|
|
0
|
19
|
December 15, 2025
|
|
G8C12 - Which type of code is used for sending characters in a PSK31 signal?
|
|
0
|
10
|
December 15, 2025
|
|
G8C06 - What action results from a failure to exchange information due to excessive transmission attempts when using an ARQ mode?
|
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0
|
9
|
December 15, 2025
|
|
G8C11 - How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?
|
|
0
|
7
|
December 15, 2025
|
|
G9C10 - Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?
|
|
0
|
10
|
December 15, 2025
|
|
G9C03 - How do the lengths of a three-element Yagi reflector and director compare to that of the driven element?
|
|
0
|
10
|
December 15, 2025
|
|
G9B09 - Which of the following is an advantage of using a horizontally polarized as compared to a vertically polarized HF antenna?
|
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0
|
8
|
December 15, 2025
|
|
G9B03 - Which of the following best describes the radiation pattern of a quarter-wave ground-plane vertical antenna?
|
|
0
|
10
|
December 15, 2025
|
|
G9A08 - If the SWR on an antenna feed line is 5:1, and a matching network at the transmitter end of the feed line is adjusted to present a 1:1 SWR to the transmitter, what is the resulting SWR on the feed line?
|
|
0
|
11
|
December 15, 2025
|
|
G9D09 - What is the primary use of a Beverage antenna?
|
|
0
|
11
|
December 15, 2025
|
|
G9D03 - In which direction is the maximum radiation from a VHF/UHF “halo” antenna?
|
|
0
|
12
|
December 15, 2025
|
|
G9C09 - In free space, how does the gain of two three-element, horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single three-element Yagi?
|
|
0
|
11
|
December 15, 2025
|
|
G9C02 - What is the approximate length of the driven element of a Yagi antenna?
|
|
0
|
12
|
December 15, 2025
|
|
G9B08 - How does the feed point impedance of a 1/2 wave dipole change as the feed point is moved from the center toward the ends?
|
|
0
|
10
|
December 15, 2025
|
|
G9B02 - Which of the following is a common way to adjust the feed point impedance of an elevated quarter-wave ground-plane vertical antenna to be approximately 50 ohms?
|
|
0
|
9
|
December 15, 2025
|
|
G9A07 - What must be done to prevent standing waves on a feed line connected to an antenna?
|
|
0
|
8
|
December 15, 2025
|
|
G9A06 - In what units is RF feed line loss usually expressed?
|
|
0
|
4
|
December 15, 2025
|
|
G8C05 - In an ARQ mode, what is meant by a NAK response to a transmitted packet?
|
|
0
|
7
|
December 15, 2025
|
|
G8C16 - Which of the following provide digital voice modes?
|
|
0
|
9
|
December 15, 2025
|
|
G8C10 - How does forward error correction (FEC) allow the receiver to correct data errors?
|
|
0
|
7
|
December 15, 2025
|
|
G8C04 - Which of the following describes Baudot code?
|
|
0
|
6
|
December 15, 2025
|
|
G8C15 - What does an FT8 signal report of +3 mean?
|
|
0
|
17
|
December 15, 2025
|
|
G8C09 - Which is true of mesh network microwave nodes?
|
|
0
|
12
|
December 15, 2025
|
|
G8C03 - What part of a packet radio frame contains the routing and handling information?
|
|
0
|
5
|
December 15, 2025
|
|
G8C14 - Which of the following describes a waterfall display?
|
|
0
|
8
|
December 15, 2025
|
|
G8C13 - What is indicated on a waterfall display by one or more vertical lines on either side of a data mode or RTTY signal?
|
|
0
|
39
|
December 15, 2025
|
|
G8C08 - Which of the following statements is true about PSK31?
|
|
0
|
10
|
December 15, 2025
|
|
G8C07 - Which of the following narrow-band digital modes can receive signals with very low signal-to-noise ratios?
|
|
0
|
12
|
December 15, 2025
|
|
G8C02 - Which digital mode is used as a low-power beacon for assessing HF propagation?
|
|
0
|
11
|
December 15, 2025
|