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SUBELEMENT G3B

FCC General

SUBELEMENT G3B

G3B – Maximum Usable Frequency; Lowest Usable Frequency; short path and long path propagation; determining propagation conditions; ionospheric refraction

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G3B01

What is a characteristic of skywave signals arriving at your location by both short-path and long-path propagation?

2 / 12

G3B02

What factors affect the MUF?

3 / 12

G3B03

Which frequency will have the least attenuation for long-distance skip propagation?

4 / 12

G3B04

Which of the following is a way to determine current propagation on a desired band from your station?

  1. Use a network of automated receiving stations on the internet to see where your transmissions are being received

5 / 12

G3B05

How does the ionosphere affect radio waves with frequencies below the MUF and above the LUF?

6 / 12

G3B06

What usually happens to radio waves with frequencies below the LUF?

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G3B07

What does LUF stand for?

8 / 12

G3B08

What does MUF stand for?

9 / 12

G3B09

What is the approximate maximum distance along the Earth’s surface normally covered in one hop using the F2 region?

10 / 12

G3B10

What is the approximate maximum distance along the Earth’s surface normally covered in one hop using the E region?

11 / 12

G3B11

What happens to HF propagation when the LUF exceeds the MUF?

12 / 12

G3B12

Which of the following is typical of the lower HF frequencies during the summer?

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SUBELEMENT G0A

FCC General

SUBELEMENT G0A

G0A – RF safety principles, rules, and guidelines; routine station evaluation

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G0A12  [1.1307(1)(b)(3)(i)(A)]

What stations are subject to the FCC rules on RF exposure?

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G0A11

What precaution should be taken if you install an indoor transmitting antenna?

3 / 12

G0A10

What should be done if evaluation shows that a neighbor might experience more than the allowable limit of RF exposure from the main lobe of a directional antenna?

4 / 12

G0A09

What type of instrument can be used to accurately measure an RF field strength?

5 / 12

G0A08  [97.13(c)(2)]

Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations?

6 / 12

G0A07

What is the effect of modulation duty cycle on RF exposure?

7 / 12

G0A06  [97.13(c)(2), 1.1307(1)(b)(3)(i)]

What must you do if your station fails to meet the FCC RF exposure exemption criteria?

8 / 12

G0A05  [97.13(c)(2), 1.1307(b)]

What must you do if an evaluation of your station shows that the RF energy radiated by your station exceeds permissible limits for possible human absorption?

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G0A04

What does “time averaging” mean when evaluating RF radiation exposure?

10 / 12

G0A03  [97.13(c)(1)]

How can you determine that your station complies with FCC RF exposure regulations?

11 / 12

G0A02

Which of the following is used to determine RF exposure from a transmitted signal?

12 / 12

G0A01

What is one way that RF energy can affect human body tissue?

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SUBELEMENT G9A

FCC General

SUBELEMENT G9A

G9A – Feed lines: characteristic impedance and attenuation; standing wave ratio (SWR) calculation, measurement, and effects; antenna feed point matching

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G9A11

What is the effect of transmission line loss on SWR measured at the input to the line?

2 / 11

G9A10

What standing wave ratio results from connecting a 50-ohm feed line to a 10-ohm resistive load?

3 / 11

G9A09

What standing wave ratio results from connecting a 50-ohm feed line to a 200-ohm resistive load?

4 / 11

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?

5 / 11

G9A07

What must be done to prevent standing waves on a feed line connected to an antenna?

6 / 11

G9A06

In what units is RF feed line loss usually expressed?

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G9A05

How does the attenuation of coaxial cable change with increasing frequency?

8 / 11

G9A04

What causes reflected power at an antenna’s feed point?

9 / 11

G9A03

What is the nominal characteristic impedance of “window line” transmission line?

10 / 11

G9A02

What is the relationship between high standing wave ratio (SWR) and transmission line loss?

11 / 11

G9A01
Which of the following factors determine the characteristic impedance of a parallel conductor feed line?

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